Leo II (dwarf galaxy): Difference between revisions

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			{{Short description\| Dwarf Spheroidal galaxy in the constellation Leo }}
	{{Infobox Galaxy		{{Infobox Galaxy
	\| name = Leo II		\| name = Leo II
	\| image =~~<!--~~ ~~Deleted~~ ~~image removed: ] -->~~		\| image = LG Leo II (26422781005).jpg
	\| epoch = ]		\| epoch = ]
	\| type = E0 pec <ref name="ned">{{cite web		\| type = E0 pec <ref name="ned">{{cite web
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	\| dist_ly = 690 ± 70 ] (210 ± 20 ])<ref name="kara04">		\| dist_ly = 690 ± 70 ] (210 ± 20 ])<ref name="kara04">
	{{cite journal		{{cite journal
	\| ~~author~~=I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov		\|author1=I. D. Karachentsev \|author2=V. E. Karachentseva \|author3=W. K. Hutchmeier \|author4=D. I. Makarov \| title=A Catalog of Neighboring Galaxies
	\| title=A Catalog of Neighboring Galaxies
	\| journal=Astronomical Journal		\| journal=Astronomical Journal
	\| date=2004		\| date=2004
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	\| pages=2031–2068		\| pages=2031–2068
	\| bibcode=2004AJ....127.2031K		\| bibcode=2004AJ....127.2031K
	\| doi=10.1086/382905}}</ref>		\| doi=10.1086/382905\| doi-access=free
			}}</ref>
	<ref name="kara06">		<ref name="kara06">
	{{cite journal		{{cite journal
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	\| pages=3–18		\| pages=3–18
	\| bibcode=2006Ap.....49....3K		\| bibcode=2006Ap.....49....3K
	\| doi=10.1007/s10511-006-0002-6 }}</ref>		\| doi=10.1007/s10511-006-0002-6 \| s2cid=120973010
			}}</ref>
	\| z = 0.000264 (79 ± 1 km/]) <ref name="ned" />		\| z = 0.000264 (79 ± 1 km/]) <ref name="ned" />
	\| appmag_v = 12.6 <ref name="ned" />		\| appmag_v = 12.6 <ref name="ned" />
	\| size_v = 12.0 x 11.0 arcmin <ref name="ned" />		\| size_v = 12.0 x 11.0 arcmin <ref name="ned" />
	\| constellation name = ]		\| constellation name = ]
	\| names = ] 34176		\| names = ] 34176, ] 93
	}}		}}

	'''Leo II''' (or Leo B) is a ] about 690,000 ]s away in the ] ]. ~~As of October 2008 it~~ is one of 24 known satellite galaxies of the ].<ref name="toll08">		'''Leo II''' (or Leo B) is a ] about 690,000 ]s away in the ] ]. It is one of 24 known ] of the ].<ref name="toll08">
	{{cite journal		{{cite journal
	\| author = Tollerud, E.		\| author = Tollerud, E.
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	\| doi = 10.1086/592102		\| doi = 10.1086/592102
	\| bibcode=2008ApJ...688..277T		\| bibcode=2008ApJ...688..277T
	\| arxiv=0806.~~4381v2~~		\| arxiv=0806.4381
			\| s2cid = 15468628
	}}</ref>		}}</ref>
	~~As of 2007~~ Leo II is thought to have a core radius of 178 ± 13 ] and a tidal radius of 632 ± 32 pc.<ref>		Leo II is thought to have a core radius of 178 ± 13 ] and a tidal radius of 632 ± 32 pc.<ref>
	{{cite journal		{{cite journal
	\| author = Coleman, M.		\| author = Coleman, M.
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	\| bibcode = 2007AJ....134.1938C		\| bibcode = 2007AJ....134.1938C
	\| doi = 10.1086/522229		\| doi = 10.1086/522229
	\|arxiv = 0708.1853 ~~}}</ref>~~		\|arxiv = 0708.1853 \| s2cid = 14819170
			}}</ref>
	It was discovered in 1950 by ] and ], from the ] and ] in California.		It was discovered in 1950 by ] and ], from the ] and ] in California.

	==Recent Findings==
	In 2007 a team of 15 scientists observed Leo II through the 8.2 meter ] optical-infrared ] in Mauna Kea, Hawaii. Over 2 nights, 90 minutes of exposures were taken and 82,252 ]s were detected down to a visible ] of 26. They found that Leo II consists largely of ] older ]s, a sign that it has survived the galactic cannibalism under which massive galaxies (e.g., the ]) consume smaller galaxies to attain their extensive size.<ref name="pr07nov28">		In 2007 a team of 15 scientists observed Leo II through the 8.2 meter ] optical-infrared ] in Mauna Kea, Hawaii. Over 2 nights, 90 minutes of exposures were taken and 82,252 ]s were detected down to a visible ] of 26. They found that Leo II consists largely of ] older ]s, a sign that it has survived the galactic cannibalism under which massive galaxies (e.g., the ]) consume smaller galaxies to attain their extensive size.<ref name="pr07nov28">
	{{cite web		{{cite web
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	\| doi = 10.1086/519380		\| doi = 10.1086/519380
	\| bibcode=2007AJ....134..566K		\| bibcode=2007AJ....134..566K
	\|arxiv = 0704.3437 ~~}}</ref>~~		\|arxiv = 0704.3437 \| s2cid = 15079314
			}}</ref>

	==See also==		==See also==
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	==References==		==References==
	{{reflist}}		{{reflist}}
	*{{cite journal \| author = Harrington R. G. \| author2 = Wilson A. G. \| date = 1950 \| title = Two New Stellar Systems in Leo ~~\| url =~~ \| journal = ] \| volume = 62 \| issue = 365\| pages = 118–120 \|doi=10.1086/126249 \| bibcode=1950PASP...62..118H }}		*{{cite journal \| author = Harrington R. G. \| author2 = Wilson A. G. \| date = 1950 \| title = Two New Stellar Systems in Leo \| journal = ] \| volume = 62 \| issue = 365\| pages = 118–120 \|doi=10.1086/126249 \| bibcode=1950PASP...62..118H \| doi-access = free }}

			==External links==
			* {{commons category-inline}}

	{{Milky Way}}		{{Milky Way}}
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	]		]
	]		]
	]		]
	]		]


	{{galaxy-stub}}		{{Elliptical-galaxy-stub}}

Latest revision as of 18:24, 31 October 2024

Dwarf Spheroidal galaxy in the constellation Leo

Leo II

Observation data (J2000 epoch)
Constellation	Leo
Right ascension	11 13 29.2
Declination	+22° 09′ 17″
Redshift	0.000264 (79 ± 1 km/s)
Distance	690 ± 70 kly (210 ± 20 kpc)
Apparent magnitude (V)	12.6
Characteristics
Type	E0 pec
Apparent size (V)	12.0 x 11.0 arcmin
Other designations
PGC 34176, DDO 93

Leo II (or Leo B) is a dwarf spheroidal galaxy about 690,000 light-years away in the constellation Leo. It is one of 24 known satellite galaxies of the Milky Way. Leo II is thought to have a core radius of 178 ± 13 pc and a tidal radius of 632 ± 32 pc. It was discovered in 1950 by Robert George Harrington and Albert George Wilson, from the Mount Wilson and Palomar Observatories in California.

In 2007 a team of 15 scientists observed Leo II through the 8.2 meter Subaru optical-infrared telescope in Mauna Kea, Hawaii. Over 2 nights, 90 minutes of exposures were taken and 82,252 stars were detected down to a visible magnitude of 26. They found that Leo II consists largely of metal-poor older stars, a sign that it has survived the galactic cannibalism under which massive galaxies (e.g., the Milky Way) consume smaller galaxies to attain their extensive size.

Observation at ESO estimates Leo II's mass to be (2.7 ± 0.5)×10 M_⊙.

References

^ "NASA/IPAC Extragalactic Database". Results for Leo B. Retrieved 2006-11-18.
I. D. Karachentsev; V. E. Karachentseva; W. K. Hutchmeier; D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal. 127 (4): 2031–2068. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.
Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics. 49 (1): 3–18. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6. S2CID 120973010.arXiv:0708.1853
Tollerud, E.; et al. (Nov 2008). "Hundreds of Milky Way Satellites? Luminosity Bias in the Satellite Luminosity Function". Astrophysical Journal. 688 (1): 277–289. arXiv:0806.4381. Bibcode:2008ApJ...688..277T. doi:10.1086/592102. S2CID 15468628.
Coleman, M.; et al. (Nov 2007). "A Wide-Field View of Leo II: A Structural Analysis Using the Sloan Digital Sky Survey". Astronomical Journal. 134 (5): 1938–1951. arXiv:0708.1853. Bibcode:2007AJ....134.1938C. doi:10.1086/522229. S2CID 14819170.
"Leo II: An Old Dwarf Galaxy with Juvenescent Heart". National Astronomical Observatory of Japan. 28 Nov 2007. Retrieved 25 Nov 2008.
Andreas Koch; et al. (August 2007). "Stellar Kinematics in the Remote Leo II Dwarf Spheroidal Galaxy—Another Brick in the Wall". Astronomical Journal. 134 (2): 566–578. arXiv:0704.3437. Bibcode:2007AJ....134..566K. doi:10.1086/519380. S2CID 15079314.

Harrington R. G.; Wilson A. G. (1950). "Two New Stellar Systems in Leo". Publications of the Astronomical Society of the Pacific. 62 (365): 118–120. Bibcode:1950PASP...62..118H. doi:10.1086/126249.

External links

Media related to Leo II (dwarf galaxy) at Wikimedia Commons

Milky Way

Location

Milky Way → Milky Way subgroup → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Local Hole → Observable universe → Universe
Each arrow (→) may be read as "within" or "part of".

Structure

Galactic Center	Sagittarius A Sagittarius A* Fermi bubbles Supermassive black hole Galactic Center filaments
Disk	Carina–Sagittarius Norma–Cygnus Orion–Cygnus Perseus Scutum–Centaurus Near 3 kpc Arm Far 3 kpc Arm
Halo	Aquarius Stream Fimbulthul stream Gaia Sausage Helmi stream Magellanic Stream Monoceros Ring Palomar 5 stream Pisces-Eridanus stream Sagittarius Stream Virgo Stream

Satellite
galaxies

Magellanic Clouds

Dwarfs

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Categories:

Latest revision as of 18:24, 31 October 2024

See also

References

External links