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Classification in astronomy
In astronomy, the term compact object (or compact star) refers collectively to white dwarfs, neutron stars, and black holes. It could also include exotic
Compact_object
Mathematical concept
In mathematics, compact objects, also referred to as finitely presented objects, or objects of finite presentation, are objects in a category satisfying
Compact_object_(mathematics)
Faint neutron star at the center of a supernova remnant
A central compact object (CCO) is an x-ray source found near the center of a young, nearby supernova remnant (SNR). Given the x-ray flux and spectra of
Central_compact_object
Compact astronomical body
A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein's theory of general
Black_hole
Galactic X-ray source in the constellation Cygnus that is very likely a black hole
3×103 jansky). It remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 21.2 times the mass
Cygnus_X-1
Hypothetical form of dark matter in galactic halos
A Massive Compact Halo Object (MACHO) is a kind of astronomical body that might explain the apparent presence of dark matter in galactic halos. A MACHO
Massive_compact_halo_object
Theory of gravitation as curved spacetime
compact objects in question appear to have no solid surface, which can be deduced from the examination of X-ray bursts for which the central compact object
General_relativity
Natural physical entity in space
An astronomical object, celestial object, stellar object or heavenly object is a naturally occurring physical entity, association, or structure that exists
Astronomical_object
Supernova remnant
particle acceleration and contains a central compact object (CCO) that challenges conventional models of compact star formation due to its unusually low mass
HESS_J1731−347
Class of binary stars
massive normal star is captured by the compact object, and produces X-rays as it falls onto the compact object. In a high-mass X-ray binary, the massive
X-ray_binary
Topics referred to by the same term
(TV series), a 1960s British soap opera Compact star, also called a compact object, a degenerate star like a neutron star Campact, a German nongovernmental
Compact
System of two stars orbiting each other
contains a compact object such as a white dwarf, neutron star or black hole, gas from the other (donor) star can accrete onto the compact object. This releases
Binary_star
X-ray binary in the Whirlpool Galaxy
Whirlpool Galaxy consisting of two components, a blue supergiant, and a compact object. The binary system has a predicted age between 4 and 16 million years
M51-ULS-1
Supermassive black hole at the center of the Milky Way
emission from the center of the galaxy appeared to be due to a compact non-thermal radio object embedded in a larger, and much brighter, radio source, Sagittarius A
Sagittarius_A*
Collapsed core of a massive star
systems continue to evolve, with many companions eventually becoming compact objects such as white dwarfs or neutron stars themselves, though other possibilities
Neutron_star
In mathematics, process for extending a category
the object X is, in contrast to the fact that X need not be compact in C. Conversely, any compact object in Ind(C) arises as the image of an object in
Ind-completion
Body of interstellar clouds
from the supernova explosion are then ionized by the energy and the compact object that its core produces. One of the best examples of this is the Crab
Nebula
Change in luminosity of a moving object due to special relativity
jets of plasma that originate from a central compact object that is accreting matter. Accreting compact objects and relativistic jets are invoked to explain
Relativistic_beaming
European space mission to measure gravitational waves
holes orbited by small compact objects, known as extreme mass ratio inspirals, binaries of compact stars, substellar objects orbiting such binaries,
Laser Interferometer Space Antenna
Laser_Interferometer_Space_Antenna
Double stars that show a significant interaction between their components
components is a compact object which is well within its Roche lobe, while the other is an evolved giant star. If the compact object is a white dwarf
Interacting_binary_star
1987 supernova event in the constellation Dorado
given the size of the original star. The neutrino data indicate that a compact object did form at the star's core, and astronomers immediately began searching
SN_1987A
Aftermath of a neutron star merger
expansion at different distances." The inspiral and merging of two compact objects are a strong source of gravitational waves (GW). The basic model for
Kilonova
the densest objects in the universe only being surpassed by black holes. They generally have masses in the order of 1.5 solar masses compact into an area
List of most massive neutron stars
List_of_most_massive_neutron_stars
Astrophysical phenomenon
long-standing puzzle surrounding Type II supernovae is why the remaining compact object receives a large velocity away from the epicentre; pulsars, and thus
Supernova
Common gas atmosphere of a binary star system
envelope can lead to the formation of a binary system composed of a compact object with a close companion. Cataclysmic variables, X-ray binaries, and systems
Common_envelope
EF5 tornado in North Dakota, US
Project found an empirical relationship between the distance large and compact objects, such as farm equipment and vehicles, were thrown by the tornado, and
2025_Enderlin_tornado
Region in spacetime from which nothing can escape
proposed that gravity can be strong enough in the vicinity of massive compact objects that even light cannot escape. At that time, the Newtonian theory of
Event_horizon
English mathematician, mathematical physicist (born 1931)
Reinhard Genzel and Andrea Ghez for the discovery of a supermassive compact object at the centre of our galaxy. In the same year, he was also awarded the
Roger_Penrose
Hypothetical types of stars
transparent and invisible. The immense gravity of a compact boson star would bend light around the object, creating an empty region resembling the shadow
Exotic_star
Time period of seeming infinite density just after the Big Bang
(2020). "Theoretical foundation for black holes and the supermassive compact object at the Galactic centre" (PDF). Nobel Foundation. Borde, Arvind; Guth
Initial_singularity
British astrophysicist (1882–1944)
luminosity of stars, or the radiation generated by accretion onto a compact object, is named in his honour. Around 1920, he foreshadowed the discovery
Arthur_Eddington
Theoretical physicist
Schwarzschild singularity for mini black holes, yielding a non-singular compact object without event horizon, and cosmological singularities. He has also conjectured
Anupam_Mazumdar
Constellation in the northern celestial hemisphere
by neutrinos. While the compact object is thought to be a neutron star or possibly a black hole, it is possible that the object is instead a more exotic
Cygnus_(constellation)
Largest type of black hole
massive compact object would explain the properties of quasars. It would require a mass of around 108 M☉ to match the output of these objects. Donald
Supermassive_black_hole
American astronomer (born 1965)
Reinhard Genzel "for the discovery of a supermassive compact object at the centre of our galaxy". This object is generally recognized to be a black hole. Her
Andrea_M._Ghez
Barred spiral galaxy in the Local Group
named 3XMM J004232.1+411314, and identified as a binary system where a compact object (a neutron star or a black hole) accretes matter from a star. Multiple
Andromeda_Galaxy
Digital optical disc data storage format
The compact disc (CD) is a digital optical disc data storage format co-developed by Philips and Sony to store and play digital audio recordings. It employs
Compact_disc
Galaxy in the constellation Cetus
kpc/arcsec multiplied by the given angular diameters. "Detailed Information for Object ABELL 0085 BCG". NASA/IPAC Extragalactic Database. Retrieved September 11
Holmberg_15A
Type of garbage collection algorithm
reachable objects are marked, then a compacting step relocates the reachable (marked) objects towards the beginning of the heap area. Compacting garbage
Mark–compact_algorithm
Supermassive black hole
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SDSS_J1106+1939
Star in the constellation Cassiopeia
+61 303 is a binary system containing a massive star and a compact object. The compact object is a pulsar and the system is around 7,000 light-years away
LS_I_+61_303
Old and distant quasar
million years after the Big Bang List of the most distant astronomical objects List of quasars PSO J172.3556+18.7734 ULAS J1342+0928 Wang et al. 2021
QSO_J0313−1806
Region around a black hole at which light orbits
photon spheres can only exist in the space surrounding an extremely compact object (a black hole or possibly an "ultracompact" neutron star). The photon
Photon_sphere
Reinhard Genzel Germany United States "For the discovery of a supermassive compact object at the centre of our galaxy." Andrea Ghez United States 2021 Syukuro
List of Nobel laureates in Physics
List_of_Nobel_laureates_in_Physics
German astrophysicist (born 1952)
the 2020 Nobel Prize in Physics "for the discovery of a supermassive compact object at the centre of our galaxy", which he shared with Andrea Ghez and Roger
Reinhard_Genzel
Type of stellar collision
the first evidence of a long GRB associated with the merger of a "compact binary object", thus potentially including a BNS. Following this, GRB 191019A
Neutron_star_merger
Star in the constellation Norma
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XTE_J1550−564
Stellar core remnant
AR Scorpii was identified in 2016 as the first pulsar in which the compact object is a white dwarf instead of a neutron star. A second white dwarf pulsar
White_dwarf
Star whose brightness fluctuates, as seen from Earth
supernovae. X-ray variables, close binary systems with a hot mass-accreting compact object. Extrinsic variable stars The variability is caused by external viewing
Variable_star
Study of random spatial patterns
object processes, allowing construction of elaborate random spatial patterns. The simplest version, the Boolean model, places a random compact object
Stochastic_geometry
Dutch astronomer (born 1940)
is well known for his work on the formation and evolution of compact astrophysical objects such as neutron stars, black holes, and white dwarfs in binary
Ed_van_den_Heuvel
Millisecond pulsar in the constellation Sagittarius
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SWIFT_J1756.9−2508
High mass X-ray binary in the constellation of Cygnus
is often considered to be a microquasar, and it is believed to be a compact object in a binary system which is pulling in a stream of gas from an ordinary
Cygnus_X-3
Magnetar located near the black hole Sagittarius A*
magnetar, which is also a pulsar, is 0.33 ly from the central black hole. The object helps researchers probe the ionized interstellar medium (ISM) toward the
SGR_J1745−2900
Compact extragalactic object
The Cliff (RUBIES-UDS-154183) is a compact extragalactic object observed as a little red dot with an exceptional (and cliff-like) Balmer jump. It was discovered
The Cliff (astronomical object)
The_Cliff_(astronomical_object)
Third most distant quasar known with a redshift of 7.52
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Pōniuāʻena
Particle outflow from an accretion disk
(2015-06-01). "Kilonova light curves from the disc wind outflows of compact object mergers". Monthly Notices of the Royal Astronomical Society. 450 (2):
Disk_wind
Category in mathematics
a quasi-compact quasi-separated scheme is compactly generated by one object. The stable homotopy category is compactly generated by one object, the sphere
Triangulated_category
High mass X-ray binary star in the constellation Centaurus
Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data
PSR_B1259−63
Blazar in the constellation Ursa Major
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Q0906+6930
Gamma-ray Binary in the Large Magellanic Cloud
relativistic particles from the compact object. LMC P3 resides within the supernova remnant DEM L241 and serves as a key object for studying particle acceleration
LMC_P3
Type Ic supernova
an interaction of a companion star of the star that exploded with a compact object, probably a neutron star or a black hole. SN 2022jli was discovered
SN_2022jli
Class of X-ray binary stars
latter case the compact object is a white dwarf that accretes hydrogen that finally undergoes explosive burning. The compact object of the broader class
X-ray_burster
Hypothesized alternative to a black hole
astrophysics, a gravastar (a blend word of "gravitational vacuum star") is an object hypothesized in a 2001 paper by Pawel O. Mazur and Emil Mottola as an alternative
Gravastar
Quasar in the constellation Aquarius
PKS 2131−021 is a quasar and a BL Lacerate object, producing an astrophysical jet. lt is located in the constellation Aquarius and classified as a blazar
PKS_2131−021
Compact exotic star which forms matter consisting mostly of quarks
A quark star is a hypothetical type of compact, exotic star, where extremely high core temperature and pressure have forced nuclear particles to form
Quark_star
Term for accelerations felt as weight in multiples of standard gravity
during an impact, the shock on an object is ( h / d ) {\displaystyle (h/d)} · ɡ0. For example, a stiff and compact object dropped from 1 m that impacts over
G-force
Star in the constellation Sagittarius
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Bursting_Pulsar
Galaxy containing the Solar System
around the center indicates that Sagittarius A* harbors a massive, compact object. This concentration of mass is best explained as a supermassive black
Milky_Way
Pulsar in the constellation Scutum
Fernando Camilo, who was using the Parkes Observatory when he discovered the object. At the time of discovery, it was spinning once every 0.9129 seconds. However
PSR_J1841−0500
Pulsar in the constellation Dorado
Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR. Middleditch, John; Marshall, Francis E.; Wang, Q. Daniel; Gotthelf
PSR_J0537−6910
likely to be found in the centers of galaxies, where stellar mass compact objects, such as stellar black holes and neutron stars, may be found orbiting
Extreme_mass_ratio_inspiral
Gamma radiation with photon energies between 100GeV and 100TeV
astronomical sources such as some binary star systems containing a compact object. For example, radiation emitted from Cygnus X-3 has been measured at
Very-high-energy_gamma_ray
List of versions of the Java programming language
of Java SE: JEP 404: Generational Shenandoah (Experimental) JEP 450: Compact Object Headers (Experimental) (formerly known as Project Lilliput) JEP 472:
Java_version_history
Attraction of masses and energy
not escape from a sufficiently large and compact object. Frame dragging, the idea that a rotating massive object should twist spacetime around it, was confirmed
Gravity
Radio pulsar in the constellation Leo
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PSR_B0950+08
Japanese artist
these listed components refers to Nakanishi’s “Compact Object” (Konpakuto obuje) works. These objects are ostrich egg shaped resin sculptures, filled
Natsuyuki_Nakanishi
Radio galaxy and elliptical galaxy in the constellation Perseus
Reveals Closest Pair of Supermassive Black Holes (UNM Today) 2 May 2006 A Compact Supermassive Black-Hole Binary System Archived 16 February 2013 at the
4C_+37.11
Star in the constellation Carina and closest magnetar to Earth
Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR. "1E 1048.1-5937". SIMBAD. Centre de données astronomiques de
1E_1048−59
Galaxy in the constellation Ursa Major
Astronomy Fujimoto, S.; Brammer, G.B.; Watson, D. (14 April 2022), "A dusty compact object bridging galaxies and quasars at cosmic dawn." (PDF), Nature, 604 (604):
GNz7q
Grouping of stars by similar metallicity
have ejected all material that did not fall back into the resulting compact object, so it is suspected that the elements formed in lower energy supernovae
Stellar_population
Star in the constellation Corona Australis
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V691_Coronae_Australis
Supermassive black hole
Lucas J.; et al. (25 July 2023). "JWST UNCOVER: Extremely Red and Compact Object at zphot ≃ 7.6 Triply Imaged by A2744". The Astrophysical Journal. 952
Abell_2744-QSO1
They are also precisely the dualizable objects in this category. A compact object in the ∞-category of (say right) module spectra over a ring spectrum
Perfect_complex
Pulsar in the constellation Taurus
Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR. Anderson, S. B.; Cadwell, B. J.; Jacoby, B. A.; Wolszczan, A
PSR_J0538+2817
U.S. agreement on presidential elections
The National Popular Vote Interstate Compact (NPVIC) is an agreement among a group of U.S. states and the District of Columbia to award all their electoral
National Popular Vote Interstate Compact
National_Popular_Vote_Interstate_Compact
Hypothesized galaxy with no, or very few, stars
within an identifiable compact object—without the presence of molecular gas or optical counterpart—suggests that the compact object is bound together by
Dark_galaxy
X-ray binary star in the constellation Ara
Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR. "XTE J1650-500". SIMBAD. Centre de données astronomiques de Strasbourg
XTE_J1650−500
Binary star system in the constellation Scutum
microquasar. LS 5039 consists of a massive O-type main-sequence star, and a compact object (likely a black hole) that emits HE (high energy) and VHE (very high
LS_5039
Compact astronomical object in the constellation Ursa Major
a compact, high-redshift astronomical object located in the Ursa Major constellation. As of 2026, it is one of the most thoroughly studied objects of
3DHST-AEGIS-12014
American theoretical physicist
deformability) of the compact object. This formalism separates three scales in the problem—the gravitational radius of the compact objects, their orbital separation
Walter_D._Goldberger
Suspected black hole
ever known, its luminosity exceeds the Eddington limit for a stellar mass object. M82 X-2 Fiorito, Ralph; Titarchuk, Lev (2004). "Is M82 X-1 Really an Intermediate-Mass
M82_X-1
Coming together of two stars
density, the merger is conjectured to produce a Thorne–Żytkow object, a hypothetical type of compact star containing a neutron star enveloped by a red giant
Stellar_collision
Net movement of mass from one location, phase, etc. to another
lobe and becomes gravitationally bound to a second body, usually a compact object (white dwarf, neutron star or black hole), and is eventually accreted
Mass_transfer
Star in the constellation Perseus
2012 calculated a mass of 2.1 M☉, which raises questions as to what the object actually is. It is also known to have a companion M-type main-sequence star
GRO_J0422+32
Quasar in the constellation Aquarius
billion-solar-mass supermassive black hole. It is one of the brightest objects so far discovered. Its discovery, using the Chandra X-Ray Observatory,
PJ352–15
Method of detecting gravitational waves
back towards the compact object. The main expected sources of continuous gravitational waves are neutron stars, very compact objects resulting from the
Ground-based interferometric gravitational-wave search
Ground-based_interferometric_gravitational-wave_search
Star in the constellation Vulpecula
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GS_2000+25
Pulsar in the constellation Puppis
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PSR_J0738−4042
Neutron star in the constellation Ophiuchus
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XTE_J1739−285
COMPACT OBJECT
COMPACT OBJECT
Boy/Male
Indian, Punjabi, Sikh
Good Company
Boy/Male
Hindu, Indian, Sanskrit
In the Company
Boy/Male
Indian, Punjabi, Sikh
Lord's Company
Boy/Male
Hindu, Indian
Compact; Firm; Solid
Surname or Lastname
Americanized form of German Eisele. Compare Isley.English
Americanized form of German Eisele. Compare Isley.English : unexplained. This name is quite widespread in Britain.
Girl/Female
Indian, Telugu
Good Company
Girl/Female
Arabic, Muslim
Beauty of Company
Boy/Male
Indian, Sanskrit
Fallen from Glory
Boy/Male
Indian, Punjabi, Sikh
Liberation through Company
Girl/Female
Muslim
Beauty of company
Boy/Male
Indian, Tamil
No Compare
Girl/Female
Tamil
Compare
Boy/Male
Indian, Punjabi, Sikh
Company of Guru
Girl/Female
Arabic, Muslim
Beauty of Company
Girl/Female
Hindu, Indian, Marathi, Tamil
Compact; Promise
Surname or Lastname
Americanized spelling of German Kahle. Compare Kahley or Köhler (see Kohler).English and Manx
Americanized spelling of German Kahle. Compare Kahley or Köhler (see Kohler).English and Manx : variant spelling of Caley.
Boy/Male
Hindu, Indian, Sanskrit
Company
Girl/Female
Arabic
Sensible Contact
Boy/Male
Hindu, Indian
Compact; Safe; Secure
Girl/Female
Hindu, Indian
Compare
COMPACT OBJECT
COMPACT OBJECT
Boy/Male
Arabic, Muslim, Parsi
King
Girl/Female
Hindu, Indian
Pure Religious
Girl/Female
Native American
Beautiful clouds arising.
Girl/Female
Hindu, Indian
Honest
Girl/Female
Arabic, Australian, Muslim
Forgiver; Forgiveness
Girl/Female
Bengali, Indian
Rain; Wind
Boy/Male
Tamil
The sacred Narmada river
Boy/Male
Muslim
Generous. Old Arabic name for the sea.
Girl/Female
Muslim/Islamic
Intelligent
Boy/Male
Tamil
Gold, Golden ornament for the neck or golden vessel
COMPACT OBJECT
COMPACT OBJECT
COMPACT OBJECT
COMPACT OBJECT
COMPACT OBJECT
p. pr. & vb. n.
of Compact
adv.
In a compact manner; with close union of parts; densely; tersely.
n.
Contact or impression by touch; collision; forcible contact; force communicated.
n.
An inclosing limit; boundary; circumference; as, within the compass of an encircling wall.
imp. & p. p.
of Compact
n.
An association of persons for the purpose of carrying on some enterprise or business; a corporation; a firm; as, the East India Company; an insurance company; a joint-stock company.
v. t.
To manure with compost.
n.
Extent; reach; sweep; capacity; sphere; as, the compass of his eye; the compass of imagination.
v. i.
To be like or equal; to admit, or be worthy of, comparison; as, his later work does not compare with his earlier.
n.
A mixture for fertilizing land; esp., a composition of various substances (as muck, mold, lime, and stable manure) thoroughly mingled and decomposed, as in a compost heap.
a.
Compact; pressed close; concentrated; firmly united.
n.
Guests or visitors, in distinction from the members of a family; as, to invite company to dine.
v. i.
To bear or endure; to put up (with); as, to comport with an injury.
n.
One who makes a compact.
v. t.
To mingle, as different fertilizing substances, in a mass where they will decompose and form into a compost.
p. p. & a
Brief; close; pithy; not diffuse; not verbose; as, a compact discourse.
n.
The crew of a ship, including the officers; as, a whole ship's company.
a.
Strong; firm; compact.
v. t.
To compact or join anew.