Bootes-I dwarf galaxy

Database links to boats I

Galaxy Bootes-I dwarf galaxy
Boat I
AladinLite
Constellation	Bear keeper
Position equinox :  J2000.0 , epoch : J2000.0
Right ascension	14 h 00 m 06 s
declination	+ 14 ° 30 ′ 00 ″
Appearance
Morphological type	dSph
Brightness  (visual)	13.1 mag
Angular expansion	(26.0 ± 1.4) ′
Physical data
Affiliation	Local group
distance	(197,000 ± 18,000) ly / (60,000 ± 6,000) pc
Absolute brightness	−5.8 mag
history
discovery	Albert George Wilson
Discovery date	1950
Catalog names
Boo I dSph, Bootes Satellite, Bootes Dwarf Spheroidal Galaxy, Bootes dSph galaxy

The Bootes-I dwarf galaxy ( Bootes I or Boo I dSph for short ) is an extremely faint spheroid dwarf galaxy in the constellation of the Bear Guardian and thus belongs to the sub-type of ultra-faint-dwarf galaxies .

properties

The galaxy has a luminosity of only about 100,000 L _☉ and an absolute brightness of −5.8 ^m . It is only about 197 k ly away and seems to be deformed and torn apart by the tidal forces of our Milky Way . She shows two star trails that cross each other. Normally, tidal forces only form a tail in satellite galaxies.

Like most of the so-called ultra-faint-dwarf galaxies , the entire galaxy is fainter than the single star Rigel .

comment

Apparent brightness = absolute brightness + distance module = −5.8 + 18.9 = 13.1

Web links

Commons : Bear Guardian Constellation  - Collection of images, videos and audio files

• 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) 5:00 p.m. April 24, 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

Individual evidence

1. ↑ ^{a b c d e f g h} Belokurov, V .; Sugar, DB; Evans, NW; Wilkinson, MI; Irwin, MJ; Hodgkin, S .; Bramich, DM; Irwin, JM; Gilmore, G .; Willman, B .; Vidrih, S .; Newberg, HJ; Wyse, RFG; Fellhauer, M .; Hewett, PC; Cole, N .; Bell, EF; Beers, TC; Rockosi, CM; Yanny, B .; Grebel, EK; Schneider, DP; Lupton, R .; Barentine, JC; Brewington, H .; Brinkmann, J .; Harvanek, M .; Kleinman, SJ; Krzesinski, J .; Long, D .; Nitta, A .; Smith, YES; Snedden, SA: A Faint New Milky Way Satellite in Bootes . In: The Astrophysical Journal . 647, No. 2, 2006, pp. L111-L114. arxiv : astro-ph / 0604355 . bibcode : 2006ApJ ... 647L.111B . doi : 10.1086 / 507324 .
2. ↑ SIMBAD Astronomical Database. In: Results for Bootes dSph. Retrieved November 21, 2011 .