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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
X-ray binary in Cygnus containing a stellar 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
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
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
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
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
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
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
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
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*
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
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
Method used to study black holes
a gravitational wave in a pattern called a 'ringdown'. After these compact objects collide, their final product enters a vibrational stage that relaxes
Black hole ringdown spectroscopy
Black_hole_ringdown_spectroscopy
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
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
List of compact objects with mass of 2.5–5 solar masses
typical black hole, often defined as roughly 2.5–5 solar masses (M☉). A compact object in this mass range often cannot be confidently determined to be a neutron
List of lower mass gap objects
List_of_lower_mass_gap_objects
Supermassive black hole
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SDSS_J1106+1939
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
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
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
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
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
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
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
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
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
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
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
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
Central compact object in the constellation Centaurus
1207.4-5209 (nicknamed as Blue Eye Pulsar) is a pulsar and a central compact object (CCO) located in the supernova remnant PKS 1209−51/52. It is about 7
1E_1207.4-5209
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
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
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,[page needed]
Laser Interferometer Space Antenna
Laser_Interferometer_Space_Antenna
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
Radio pulsar in the constellation Leo
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PSR_B0950+08
Swiss astrophysicist
astrophysics. Her work has contributed to the computational study of compact-object mergers and the interpretation of gravitational-wave signals. Campanelli
Manuela Campanelli (scientist)
Manuela_Campanelli_(scientist)
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
American theoretical astrophysicist
Columbia University. His research focuses on high-energy astrophysics, compact-object mergers, gravitational-wave sources, and electromagnetic transients
Brian_D._Metzger
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
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
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
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
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
Blazar in the constellation Ursa Major
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Q0906+6930
Neutron star
luminous source known that shows dips in the X-ray light curve. The compact object in this system has been unambiguously identified as a neutron star with
3XMM_J004232.1+411314
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
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
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
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
Hypothetical horizonless compact object in general relativity
horizonless compact object models and have been discussed in connection with black hole microstate (fuzzball) ideas and other exotic compact objects. Analyses have
Topological_star
Binary star in the constellation Orion
light-years away in Orion. It produces jets like a microquasar, the first time an object other than a black hole has been shown to produce jets. 4U 0614+091 is an
4U_0614+091
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
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
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
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)
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
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
Star in the constellation Corona Australis
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V691_Coronae_Australis
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
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
Third most distant quasar known with a redshift of 7.52
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Pōniuāʻena
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
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
Star in the constellation Norma
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XTE_J1550−564
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
Type of x-ray binary
known as X-ray novae and black hole X-ray transients, are composed of a compact object (most commonly a black hole but sometimes a neutron star) and some type
Soft_X-ray_transient
Pulsar in the constellation Puppis
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PSR_J0738−4042
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
Star in the constellation Vulpecula
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GS_2000+25
luminosity of stars, or the radiation generated by accretion onto a compact object – Arthur Stanley Eddington Aperture synthesis, used for accurate location
List of British innovations and discoveries
List_of_British_innovations_and_discoveries
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
Millisecond pulsar in the constellation Sagittarius
Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR. Krimm et al. 2007. Krimm et al. 2009. "The Extrasolar Planet
SWIFT_J1756.9−2508
Millisecond pulsar in the constellation Boötes
Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR. Bhattacharyya, B.; Roy, J.; Ray, P. S.; Gupta, Y.; Bhattacharya
PSR_J1544+4937
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
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
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
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
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
Seyfert galaxy in the constellation of Pegasus
1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331. "NED results for object MRK 0335". NASA/IPAC Extragalactic Database. National Aeronautics and Space
Markarian_335
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
Star in the constellation Aquila
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Aquila_X-1
Supernova remnant
the nearby thermal X-ray source, XMMU J172054.5-372652, is a central compact object of the supernova. G350.1-0.3 is eight light years across and about 900–1000
G350.1-0.3
Neutron star in the constellation Ophiuchus
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XTE_J1739−285
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
Archaeological area in southern Ural region
Zdanovish's views on the described territory as a unique compact object and considers the apparent compactness as an artifact of the incomplete and uncritical
Country_of_Towns
Black hole system in the constellation Cetus
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3C_75
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
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
Radio pulsar in the constellation Vela
0−4622. However, this association is considered unlikely since a central compact object with better matching kinematics to the shell has been observed. It rotates
PSR_J0855−4644
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
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
Spectroscopic binary in the constellation Dorado
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VFTS_243
Pulsar in the constellation Gemini
Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR. Jankowski, F.; Bailes, M.; Van Straten, W.; Keane, E. F.; Flynn
PSR_J0659+1414
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
Relatively young and nearby supernova remnant
than 500 parsecs, and a radial size of at least 8 parsecs. The central compact object (CCO) was discovered in 2001. In the initial Chandra X-ray image and
RX_J0852.0−4622
Neutron star in the constellation Canis Major
Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR. Kaplan, D.L.; van Kerkwijk, M.H.; Marshall, H.L.; Jacoby, B.A
RX_J0720.4−3125
COMPACT OBJECT
COMPACT OBJECT
Boy/Male
Indian, Punjabi, Sikh
Company of Guru
Boy/Male
Hindu, Indian
Compact; Firm; Solid
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
Indian, Punjabi, Sikh
Lord's Company
Girl/Female
Indian, Telugu
Good Company
Boy/Male
Hindu, Indian
Compact; Safe; Secure
Girl/Female
Tamil
Compare
Girl/Female
Arabic
Sensible Contact
Boy/Male
Indian, Sanskrit
Fallen from Glory
Boy/Male
Hindu, Indian, Sanskrit
In the Company
Girl/Female
Hindu, Indian, Marathi, Tamil
Compact; Promise
Girl/Female
Muslim
Beauty of company
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
Hindu, Indian
Compare
Boy/Male
Indian, Tamil
No Compare
Boy/Male
Hindu, Indian, Sanskrit
Company
Girl/Female
Arabic, Muslim
Beauty of Company
Boy/Male
Indian, Punjabi, Sikh
Good Company
Girl/Female
Arabic, Muslim
Beauty of Company
Boy/Male
Indian, Punjabi, Sikh
Liberation through Company
COMPACT OBJECT
COMPACT OBJECT
Girl/Female
Muslim/Islamic
A companion of Prophet (S.A.W)
Boy/Male
Muslim
Preserved, Safe
Girl/Female
Hindu
Brilliant, Glittering
Girl/Female
Arabic, Muslim
Protector; Guardian
Girl/Female
Muslim
Prosperous
Boy/Male
English
Friend of peace.
Girl/Female
Indian, Marathi
A Flower
Girl/Female
Hindu
Name of a river
Boy/Male
Hindu, Indian
Tooth; Tusk; Jaws; Yawn
Male
English
Pet form of English Richard, RICKY means "powerful ruler."
COMPACT OBJECT
COMPACT OBJECT
COMPACT OBJECT
COMPACT OBJECT
COMPACT OBJECT
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.
One who makes a compact.
n.
Extent; reach; sweep; capacity; sphere; as, the compass of his eye; the compass of imagination.
adv.
In a compact manner; with close union of parts; densely; tersely.
n.
An inclosing limit; boundary; circumference; as, within the compass of an encircling wall.
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.
v. i.
To bear or endure; to put up (with); as, to comport with an injury.
v. t.
To mingle, as different fertilizing substances, in a mass where they will decompose and form into a compost.
n.
Guests or visitors, in distinction from the members of a family; as, to invite company to dine.
imp. & p. p.
of Compact
p. pr. & vb. n.
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.
p. p. & a
Brief; close; pithy; not diffuse; not verbose; as, a compact discourse.
a.
Strong; firm; compact.
v. t.
To manure with compost.
n.
The crew of a ship, including the officers; as, a whole ship's company.
a.
Compact; pressed close; concentrated; firmly united.
n.
Contact or impression by touch; collision; forcible contact; force communicated.
v. t.
To compact or join anew.