Faster access than browser!
94 relations: Accretion disk, Active galactic nucleus, Andrea M. Ghez, Angular diameter, Apsis, Asteroid, Astronomical interferometer, Astronomical radio source, Astronomical unit, Astrophysical jet, Astrophysical maser, Chandra X-ray Observatory, Compact star, Declination, Degenerate matter, Ellipse, Elliptical galaxy, Epoch (astronomy), European Southern Observatory, European Space Agency, Event Horizon Telescope, Excited state, Extinction (astronomy), Fermi Gamma-ray Space Telescope, Galactic Center, Gamma ray, GCIRS 13E, General relativity, Gravitational lens, Hawking radiation, INTEGRAL, Intermediate-mass black hole, Karl Guthe Jansky, Kelvin, Kepler orbit, Kepler's laws of planetary motion, Kilometre, Lawrence Livermore National Laboratory, Leonard–Merritt mass estimator, Light echo, Light-second, Light-year, Magnetar, Magnetic field, Magnitude (astronomy), Max Planck Institute for Extraterrestrial Physics, Mercury (planet), Micrometre, Milky Way, Millimetre, ..., Minute and second of arc, Molecular cloud, Monthly Notices of the Royal Astronomical Society, NASA, National Geographic, National Radio Astronomy Observatory, Nature (journal), Neil Gehrels Swift Observatory, Orbital elements, Orbital period, Parsec, Perihelion and aphelion, Proper motion, Radiation pressure, Radio, Reinhard Genzel, Right ascension, S0–102, S2 (star), Sagittarius (constellation), Sagittarius A, Sagittarius B2, Schwarzschild radius, Scorpius, Seyfert galaxy, SGR J1745-2900, Solar mass, Solar System, Spiral galaxy, Sun, Supermassive black hole, Supernova remnant, Suzaku (satellite), The Astrophysical Journal, The New York Times, Theory of relativity, Very Large Array, Very Large Telescope, Very-long-baseline interferometry, Visible spectrum, W. M. Keck Observatory, X-ray, X-ray astronomy, XMM-Newton. Expand index (44 more) »
Accretion disk
An accretion disk is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.
New!!: Sagittarius A* and Accretion disk · See more »
Active galactic nucleus
An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion—and possibly all—of the electromagnetic spectrum, with characteristics indicating that the excess luminosity is not produced by stars.
New!!: Sagittarius A* and Active galactic nucleus · See more »
Andrea M. Ghez
Andrea Mia Ghez (born June 16, 1965) is an American astronomer and professor in the Department of Physics and Astronomy at UCLA.
New!!: Sagittarius A* and Andrea M. Ghez · See more »
Angular diameter
The angular diameter, angular size, apparent diameter, or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view.
New!!: Sagittarius A* and Angular diameter · See more »
Apsis
An apsis (ἁψίς; plural apsides, Greek: ἁψῖδες) is an extreme point in the orbit of an object.
New!!: Sagittarius A* and Apsis · See more »
Asteroid
Asteroids are minor planets, especially those of the inner Solar System.
New!!: Sagittarius A* and Asteroid · See more »
Astronomical interferometer
An astronomical interferometer is an array of separate telescopes, mirror segments, or radio telescope antennas that work together as a single telescope to provide higher resolution images of astronomical objects such as stars, nebulas and galaxies by means of interferometry.
New!!: Sagittarius A* and Astronomical interferometer · See more »
Astronomical radio source
Astronomical radio sources are objects in outer space that emit strong radio waves.
New!!: Sagittarius A* and Astronomical radio source · See more »
Astronomical unit
The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
New!!: Sagittarius A* and Astronomical unit · See more »
Astrophysical jet
An astrophysical jet is an astronomical phenomenon where outflows of ionised matter are emitted as an extended beam along the axis of rotation.
New!!: Sagittarius A* and Astrophysical jet · See more »
Astrophysical maser
An astrophysical maser is a naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic spectrum.
New!!: Sagittarius A* and Astrophysical maser · See more »
Chandra X-ray Observatory
The Chandra X-ray Observatory (CXO), previously known as the Advanced X-ray Astrophysics Facility (AXAF), is a Flagship-class space observatory launched on STS-93 by NASA on July 23, 1999.
New!!: Sagittarius A* and Chandra X-ray Observatory · See more »
Compact star
In astronomy, the term "compact star" (or "compact object") refers collectively to white dwarfs, neutron stars, and black holes.
New!!: Sagittarius A* and Compact star · See more »
Declination
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
New!!: Sagittarius A* and Declination · See more »
Degenerate matter
Degenerate matter is a highly dense state of matter in which particles must occupy high states of kinetic energy in order to satisfy the Pauli exclusion principle.
New!!: Sagittarius A* and Degenerate matter · See more »
Ellipse
In mathematics, an ellipse is a curve in a plane surrounding two focal points such that the sum of the distances to the two focal points is constant for every point on the curve.
New!!: Sagittarius A* and Ellipse · See more »
Elliptical galaxy
An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image.
New!!: Sagittarius A* and Elliptical galaxy · See more »
Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
New!!: Sagittarius A* and Epoch (astronomy) · See more »
European Southern Observatory
The European Southern Observatory (ESO) is a 15-nation intergovernmental research organization for ground-based astronomy.
New!!: Sagittarius A* and European Southern Observatory · See more »
European Space Agency
The European Space Agency (ESA; Agence spatiale européenne, ASE; Europäische Weltraumorganisation) is an intergovernmental organisation of 22 member states dedicated to the exploration of space.
New!!: Sagittarius A* and European Space Agency · See more »
Event Horizon Telescope
The Event Horizon Telescope (EHT) is a project to create a large telescope array consisting of a global network of radio telescopes and combining data from several very-long-baseline interferometry (VLBI) stations around the Earth.
New!!: Sagittarius A* and Event Horizon Telescope · See more »
Excited state
In quantum mechanics, an excited state of a system (such as an atom, molecule or nucleus) is any quantum state of the system that has a higher energy than the ground state (that is, more energy than the absolute minimum).
New!!: Sagittarius A* and Excited state · See more »
Extinction (astronomy)
In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.
New!!: Sagittarius A* and Extinction (astronomy) · See more »
Fermi Gamma-ray Space Telescope
The Fermi Gamma-ray Space Telescope (FGST), formerly called the Gamma-ray Large Area Space Telescope (GLAST), is a space observatory being used to perform gamma-ray astronomy observations from low Earth orbit.
New!!: Sagittarius A* and Fermi Gamma-ray Space Telescope · See more »
Galactic Center
The Galactic Center is the rotational center of the Milky Way.
New!!: Sagittarius A* and Galactic Center · See more »
Gamma ray
A gamma ray or gamma radiation (symbol γ or \gamma), is penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei.
New!!: Sagittarius A* and Gamma ray · See more »
GCIRS 13E
GCIRS 13E is an infrared and radio object near the galactic centre.
New!!: Sagittarius A* and GCIRS 13E · See more »
General relativity
General relativity (GR, also known as the general theory of relativity or GTR) is the geometric theory of gravitation published by Albert Einstein in 1915 and the current description of gravitation in modern physics.
New!!: Sagittarius A* and General relativity · See more »
Gravitational lens
A gravitational lens is a distribution of matter (such as a cluster of galaxies) between a distant light source and an observer, that is capable of bending the light from the source as the light travels towards the observer.
New!!: Sagittarius A* and Gravitational lens · See more »
Hawking radiation
Hawking radiation is blackbody radiation that is predicted to be released by black holes, due to quantum effects near the event horizon.
New!!: Sagittarius A* and Hawking radiation · See more »
INTEGRAL
INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) is a currently operational space telescope for observing gamma rays.
New!!: Sagittarius A* and INTEGRAL · See more »
Intermediate-mass black hole
An intermediate-mass black hole (IMBH) is a class of black hole with mass in the range 102-105 solar masses: significantly more than stellar black holes but less than the 105-109 solar mass supermassive black holes.
New!!: Sagittarius A* and Intermediate-mass black hole · See more »
Karl Guthe Jansky
Karl Guthe Jansky (October 22, 1905 – February 14, 1950) was an American physicist and radio engineer who in August 1931 first discovered radio waves emanating from the Milky Way.
New!!: Sagittarius A* and Karl Guthe Jansky · See more »
Kelvin
The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
New!!: Sagittarius A* and Kelvin · See more »
Kepler orbit
In celestial mechanics, a Kepler orbit (or Keplerian orbit) is the motion of one body relative to another, as an ellipse, parabola, or hyperbola, which forms a two-dimensional orbital plane in three-dimensional space.
New!!: Sagittarius A* and Kepler orbit · See more »
Kepler's laws of planetary motion
In astronomy, Kepler's laws of planetary motion are three scientific laws describing the motion of planets around the Sun.
New!!: Sagittarius A* and Kepler's laws of planetary motion · See more »
Kilometre
The kilometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: km; or) or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix for). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the road network of the United Kingdom where the statute mile is the official unit used.
New!!: Sagittarius A* and Kilometre · See more »
Lawrence Livermore National Laboratory
Lawrence Livermore National Laboratory (LLNL) is an American federal research facility in Livermore, California, United States, founded by the University of California, Berkeley in 1952.
New!!: Sagittarius A* and Lawrence Livermore National Laboratory · See more »
Leonard–Merritt mass estimator
The Leonard–Merritt mass estimator is a formula for estimating the mass of a spherical stellar system using the apparent (angular) positions and proper motions of its component stars.
New!!: Sagittarius A* and Leonard–Merritt mass estimator · See more »
Light echo
Reflected light following path B arrives shortly after the direct flash following path A but before light following path C. B and C have the same apparent distance from the star as seen from Earth. A light echo is a physical phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance.
New!!: Sagittarius A* and Light echo · See more »
Light-second
The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics.
New!!: Sagittarius A* and Light-second · See more »
Light-year
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
New!!: Sagittarius A* and Light-year · See more »
Magnetar
A magnetar is a type of neutron star with an extremely powerful inferred magnetic field (\sim 10^ - 10^ G).
New!!: Sagittarius A* and Magnetar · See more »
Magnetic field
A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials.
New!!: Sagittarius A* and Magnetic field · See more »
Magnitude (astronomy)
In astronomy, magnitude is a logarithmic measure of the brightness of an object in a defined passband, often in the visible or infrared spectrum, but sometimes across all wavelengths.
New!!: Sagittarius A* and Magnitude (astronomy) · See more »
Max Planck Institute for Extraterrestrial Physics
The Max Planck Institute for Extraterrestrial Physics is a Max Planck Institute, located in Garching, near Munich, Germany.
New!!: Sagittarius A* and Max Planck Institute for Extraterrestrial Physics · See more »
Mercury (planet)
Mercury is the smallest and innermost planet in the Solar System.
New!!: Sagittarius A* and Mercury (planet) · See more »
Micrometre
The micrometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equaling (SI standard prefix "micro-".
New!!: Sagittarius A* and Micrometre · See more »
Milky Way
The Milky Way is the galaxy that contains our Solar System.
New!!: Sagittarius A* and Milky Way · See more »
Millimetre
The millimetre (International spelling as used by the International Bureau of Weights and Measures; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length.
New!!: Sagittarius A* and Millimetre · See more »
Minute and second of arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
New!!: Sagittarius A* and Minute and second of arc · See more »
Molecular cloud
A molecular cloud, sometimes called a stellar nursery (if star formation is occurring within), is a type of interstellar cloud, the density and size of which permit the formation of molecules, most commonly molecular hydrogen (H2).
New!!: Sagittarius A* and Molecular cloud · See more »
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
New!!: Sagittarius A* and Monthly Notices of the Royal Astronomical Society · See more »
NASA
The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.
New!!: Sagittarius A* and NASA · See more »
National Geographic
National Geographic (formerly the National Geographic Magazine and branded also as NAT GEO or) is the official magazine of the National Geographic Society.
New!!: Sagittarius A* and National Geographic · See more »
National Radio Astronomy Observatory
The National Radio Astronomy Observatory (NRAO) is a Federally Funded Research and Development Center of the United States National Science Foundation operated under cooperative agreement by Associated Universities, Inc for the purpose of radio astronomy.
New!!: Sagittarius A* and National Radio Astronomy Observatory · See more »
Nature (journal)
Nature is a British multidisciplinary scientific journal, first published on 4 November 1869.
New!!: Sagittarius A* and Nature (journal) · See more »
Neil Gehrels Swift Observatory
The Neil Gehrels Swift Observatory, previously called the Swift Gamma-Ray Burst Mission, is a NASA space telescope designed to detect gamma-ray bursts (GRBs).
New!!: Sagittarius A* and Neil Gehrels Swift Observatory · See more »
Orbital elements
Orbital elements are the parameters required to uniquely identify a specific orbit.
New!!: Sagittarius A* and Orbital elements · See more »
Orbital period
The orbital period is the time a given astronomical object takes to complete one orbit around another object, and applies in astronomy usually to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.
New!!: Sagittarius A* and Orbital period · See more »
Parsec
The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.
New!!: Sagittarius A* and Parsec · See more »
Perihelion and aphelion
The perihelion of any orbit of a celestial body about the Sun is the point where the body comes nearest to the Sun.
New!!: Sagittarius A* and Perihelion and aphelion · See more »
Proper motion
Proper motion is the astronomical measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.
New!!: Sagittarius A* and Proper motion · See more »
Radiation pressure
Radiation pressure is the pressure exerted upon any surface due to the exchange of momentum between the object and the electromagnetic field.
New!!: Sagittarius A* and Radiation pressure · See more »
Radio
Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width.
New!!: Sagittarius A* and Radio · See more »
Reinhard Genzel
Reinhard Genzel (born 24 March 1952 in Bad Homburg vor der Höhe, Germany) is a German astrophysicist.
New!!: Sagittarius A* and Reinhard Genzel · See more »
Right ascension
Right ascension (abbreviated RA; symbol) is the angular distance measured only eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point above the earth in question.
New!!: Sagittarius A* and Right ascension · See more »
S0–102
S0–102 is a star that is located very close to the centre of the Milky Way, near the radio source Sagittarius A*, orbiting it with an orbital period of 11.5 years.
New!!: Sagittarius A* and S0–102 · See more »
S2 (star)
Source 2 (abbreviated S2), also known as S0–2, is a star that is located close to the radio source Sagittarius A*, orbiting it with an orbital period of 15.56 ± 0.35 years, a semi-major axis of about 970 AU, and a pericenter distance of 17 light hours (18 Tm or 120 AU)—an orbit with a period only about 30% longer than that of Jupiter around the Sun, but coming no closer than about four times the distance of Neptune from the Sun.
New!!: Sagittarius A* and S2 (star) · See more »
Sagittarius (constellation)
Sagittarius is one of the constellations of the zodiac.
New!!: Sagittarius A* and Sagittarius (constellation) · See more »
Sagittarius A
Sagittarius A or Sgr A is a complex radio source at the center of the Milky Way.
New!!: Sagittarius A* and Sagittarius A · See more »
Sagittarius B2
Sagittarius B2 (Sgr B2) is a giant molecular cloud of gas and dust that is located about from the center of the Milky Way.
New!!: Sagittarius A* and Sagittarius B2 · See more »
Schwarzschild radius
The Schwarzschild radius (sometimes historically referred to as the gravitational radius) is a physical parameter that shows up in the Schwarzschild solution to Einstein's field equations, corresponding to the radius defining the event horizon of a Schwarzschild black hole.
New!!: Sagittarius A* and Schwarzschild radius · See more »
Scorpius
Scorpius is one of the constellations of the zodiac.
New!!: Sagittarius A* and Scorpius · See more »
Seyfert galaxy
Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars.
New!!: Sagittarius A* and Seyfert galaxy · See more »
SGR J1745-2900
SGR J1745−2900 or PSR J1745-2900 is the first discovered magnetar, orbiting a black hole in the Sagittarius A* system.
New!!: Sagittarius A* and SGR J1745-2900 · See more »
Solar mass
The solar mass is a standard unit of mass in astronomy, equal to approximately.
New!!: Sagittarius A* and Solar mass · See more »
Solar System
The Solar SystemCapitalization of the name varies.
New!!: Sagittarius A* and Solar System · See more »
Spiral galaxy
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, form part of the Hubble sequence.
New!!: Sagittarius A* and Spiral galaxy · See more »
Sun
The Sun is the star at the center of the Solar System.
New!!: Sagittarius A* and Sun · See more »
Supermassive black hole
A supermassive black hole (SMBH or SBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses, and is found in the centre of almost all currently known massive galaxies.
New!!: Sagittarius A* and Supermassive black hole · See more »
Supernova remnant
A supernova remnant (SNR) is the structure resulting from the explosion of a star in a supernova.
New!!: Sagittarius A* and Supernova remnant · See more »
Suzaku (satellite)
Suzaku (formerly ASTRO-EII) was an X-ray astronomy satellite developed jointly by NASA's Goddard Space Flight Center and the Institute of Space and Aeronautical Science at JAXA to probe high energy X-ray sources, such as supernova explosions, black holes and galactic clusters.
New!!: Sagittarius A* and Suzaku (satellite) · See more »
The Astrophysical Journal
The Astrophysical Journal, often abbreviated ApJ (pronounced "ap jay") in references and speech, is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler.
New!!: Sagittarius A* and The Astrophysical Journal · See more »
The New York Times
The New York Times (sometimes abbreviated as The NYT or The Times) is an American newspaper based in New York City with worldwide influence and readership.
New!!: Sagittarius A* and The New York Times · See more »
Theory of relativity
The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity.
New!!: Sagittarius A* and Theory of relativity · See more »
Very Large Array
The Karl G. Jansky Very Large Array (VLA) is a centimeter-wavelength radio astronomy observatory located in central New Mexico on the Plains of San Agustin, between the towns of Magdalena and Datil, ~50 miles (80 km) west of Socorro.
New!!: Sagittarius A* and Very Large Array · See more »
Very Large Telescope
The Very Large Telescope (VLT) is a telescope facility operated by the European Southern Observatory on Cerro Paranal in the Atacama Desert of northern Chile.
New!!: Sagittarius A* and Very Large Telescope · See more »
Very-long-baseline interferometry
Very-long-baseline interferometry (VLBI) is a type of astronomical interferometry used in radio astronomy.
New!!: Sagittarius A* and Very-long-baseline interferometry · See more »
Visible spectrum
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
New!!: Sagittarius A* and Visible spectrum · See more »
W. M. Keck Observatory
The W. M. Keck Observatory is a two-telescope astronomical observatory at an elevation of 4,145 meters (13,600 ft) near the summit of Mauna Kea in the U.S. state of Hawaii.
New!!: Sagittarius A* and W. M. Keck Observatory · See more »
X-ray
X-rays make up X-radiation, a form of electromagnetic radiation.
New!!: Sagittarius A* and X-ray · See more »
X-ray astronomy
X-ray astronomy is an observational branch of astronomy which deals with the study of X-ray observation and detection from astronomical objects.
New!!: Sagittarius A* and X-ray astronomy · See more »
XMM-Newton
XMM-Newton, also known as the High Throughput X-ray Spectroscopy Mission and the X-ray Multi-Mirror Mission, is an X-ray space observatory launched by the European Space Agency in December 1999 on an Ariane 5 rocket.
New!!: Sagittarius A* and XMM-Newton · See more »
Redirects here:
Black Hole at the center of the Milky Way, Black Hole at the center of the galaxy, G2 gas cloud, Sag A*, Sagitarius A*, Sagittarius A *, Sagittarius A-star, Sgr A*, SgrA*.
References
[1] https://en.wikipedia.org/wiki/Sagittarius_A*
