astro.wikisort.org - Galaxy

The Boötes Dwarf Galaxy (Boo I dSph) is a galaxy discovered in 2006, which appears faint, with a luminosity of 100,000 L_☉ and an absolute magnitude of –5.8. It lies about 197,000 light-years (60.4 kiloparsecs) away in the constellation Boötes. This dwarf spheroidal galaxy appears to be tidally disrupted[1] by the Milky Way Galaxy, which it orbits, and has two stellar tails that cross over to form a cross.^{[citation needed]} Tidally disrupted galaxies usually only form one tail.^{[citation needed]}

Boötes Dwarf Galaxy
SDSS image of Boo I
Observation data (J2000 epoch)
Constellation	Boötes
Right ascension	14h 00m 06s[1]
Declination	+14° 30′ 00″ ± 15″[1]
Distance	197 ± 18 kly (60 ± 6 kpc)[1]
Apparent magnitude (V)	13.1[a]
Characteristics
Type	dSph[1]
Apparent size (V)	26′.0 ± 1′.4[1]
Other designations
Boo dSph, Boötes Satellite, Boötes Dwarf Spheroidal Galaxy, Boötes dSph galaxy,[2] PGC 4713553

Like many of the ultrafaint dwarf spheroidals, the entire galaxy appears fainter than the Rigel system (absolute magnitude –7.84).[3] Even so, it is one of the more luminous UFDs.[4] It is metal-poor, like other UFDs, with a mean metallicity of −2.34.[4]

The stellar population of Boötes I is mostly very old stars. The two populations have essentially the same age, 13.4 billion and 13.3 billion years, respectively, with most of the stars being of the latter population.[5]

Notes

References

External links

• The Universe within 500,000 light-years The Satellite Galaxies (Atlas of the Universe)
• Two New Galaxies Orbiting the Milky Way (Ken Croswell) April 19, 2006
• Strange satellite galaxies revealed around Milky Way Kimm Groshong (New Scientist) 17:00 24 April 2006
• New Milky Way companions found: SDSS-II first to view two dim dwarf galaxies (SDSS) May 8, 2006
• Astronomers Find Two New Milky Way Companions (SpaceDaily) May 10, 2006
• Boötes Dwarf Galaxy at Constellation Guide

На других языках

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[de] Bootes-I-Zwerggalaxie

Die Bootes-I-Zwerggalaxie (kurz auch Bootes I oder Boo I dSph) ist eine äußerst lichtschwache spheroidale Zwerggalaxie im Sternbild des Bärenhüters und gehört somit zum Untertyp der Ultra-faint-dwarf-Galaxien.

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- [en] Boötes I (dwarf galaxy)

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[ru] Волопас I

Ка́рликовая гала́ктика Волопа́с I (Boo I dSph) — тусклая галактика со светимостью около 100 тыс. .mw-parser-output .ts-math{white-space:nowrap;font-family:times,serif,palatino linotype,new athena unicode,athena,gentium,code2000;font-size:120%}L⊙ и абсолютной величиной −5,8m. Она расположена на расстоянии примерно в 197 тыс. световых лет (60,4 килопарсек) от Земли в созвездии Волопас. Эта карликовая сфероидальная галактика, возможно, разорвана приливными силами галактики Млечный Путь, вокруг которой она обращается, и имеет два звёздных хвоста, которые пересекаются, образуя крест. Галактика, разорванная приливными силами, обычно образует только один хвост[3].

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