Table of Contents
23 relations: Active galactic nucleus, Angular diameter, Astrophysical X-ray source, Barred spiral galaxy, Chandra X-ray Observatory, Coma Berenices, Constellation, Epoch (astronomy), Galactic bulge, Galactic plane, Galaxy morphological classification, Glossary of astronomy, Hubble Space Telescope, Infrared, Milky Way, Position angle, Star formation, Stellar mass, Supermassive black hole, UBV photometric system, Virgo Cluster, William Herschel, XMM-Newton.
Active galactic nucleus
An active galactic nucleus (AGN) is a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.
See NGC 4561 and Active galactic nucleus
Angular diameter
The angular diameter, angular size, apparent diameter, or apparent size is an angular distance describing how large a sphere or circle appears from a given point of view.
See NGC 4561 and Angular diameter
Astrophysical X-ray source
Astrophysical X-ray sources are astronomical objects with physical properties which result in the emission of X-rays.
See NGC 4561 and Astrophysical X-ray source
Barred spiral galaxy
A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. NGC 4561 and barred spiral galaxy are barred spiral galaxies.
See NGC 4561 and Barred spiral galaxy
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 telescope launched aboard the during STS-93 by NASA on July 23, 1999.
See NGC 4561 and Chandra X-ray Observatory
Coma Berenices
Coma Berenices is an ancient asterism in the northern sky, which has been defined as one of the 88 modern constellations.
See NGC 4561 and Coma Berenices
Constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object.
See NGC 4561 and Constellation
Epoch (astronomy)
In astronomy, an epoch or reference epoch is a moment in time used as a reference point for some time-varying astronomical quantity.
See NGC 4561 and Epoch (astronomy)
Galactic bulge
In astronomy, a galactic bulge (or simply bulge) is a tightly packed group of stars within a larger star formation.
See NGC 4561 and Galactic bulge
Galactic plane
The galactic plane is the plane on which the majority of a disk-shaped galaxy's mass lies.
See NGC 4561 and Galactic plane
Galaxy morphological classification
Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance.
See NGC 4561 and Galaxy morphological classification
Glossary of astronomy
This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields.
See NGC 4561 and Glossary of astronomy
Hubble Space Telescope
The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
See NGC 4561 and Hubble Space Telescope
Infrared
Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves.
Milky Way
The Milky Way is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye. NGC 4561 and Milky Way are barred spiral galaxies.
Position angle
In astronomy, position angle (usually abbreviated PA) is the convention for measuring angles on the sky.
See NGC 4561 and Position angle
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse and form stars.
See NGC 4561 and Star formation
Stellar mass
Stellar mass is a phrase that is used by astronomers to describe the mass of a star.
Supermassive black hole
A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole, with its mass being on the order of hundreds of thousands, or millions to billions, of times the mass of the Sun.
See NGC 4561 and Supermassive black hole
UBV photometric system
The UBV photometric system (from Ultraviolet, Blue, Visual), also called the Johnson system (or Johnson-Morgan system), is a photometric system usually employed for classifying stars according to their colors.
See NGC 4561 and UBV photometric system
Virgo Cluster
The Virgo Cluster is a large cluster of galaxies whose center is 53.8 ± 0.3 Mly (16.5 ± 0.1 Mpc) away in the constellation Virgo. NGC 4561 and Virgo Cluster are coma Berenices.
See NGC 4561 and Virgo Cluster
William Herschel
Frederick William Herschel (Friedrich Wilhelm Herschel; 15 November 1738 – 25 August 1822) was a German-British astronomer and composer.
See NGC 4561 and William Herschel
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.
References
Also known as PGC 42020.