Hydrus I dwarf galaxy

Database links to Hydrus I

Galaxy Hydrus-I dwarf galaxy
AladinLite
Constellation	Little water snake
Position equinox :  J2000.0 , epoch : J2000.0
Right ascension	2 h 29 m 33.4 s
declination	-79 ° 18 ′ 32.0 ″
Appearance
Morphological type	dSph
Brightness  (visual)	(12.49 ± 0.08) mag
Physical data
Affiliation	Local group
distance	(90,000 ± 1,600) ly / (27,600 ± 500) pc
Absolute brightness	(−4.71 ± 0.08) mag
Metallicity [Fe / H]	−2.52 ± 0.09
history
discovery	Koposov et al.
Discovery date	2018
Catalog names
Hyi I dSph

The Hydrus I dwarf galaxy , also called Hydrus I or Hydrus 1 for short , is a dwarf galaxy of the type dSph discovered in 2018 in the constellation Little Water Snake in the Local Group and one of the satellite galaxies of the Milky Way between the two magellanic clouds in the Magellanic Bridge .

properties

Hyi I dSph has a half-light radius of arc minutes at a mass to luminosity ratio M / L of about 66 , which corresponds to a size of (53.3 ± 3.6) pc at a distance of about 28 kpc  . ${\displaystyle r_{h}=6{,}64_{-0{,}43}^{+0{,}46}}$

The dwarf galaxy hosts an extremely carbon-rich and metal-poor star with [ Fe / H ] = -3.2 and [C / Fe] = +3.0.

additional

• List of galaxies in the local group

Web links

Commons : Constellation Little Water Snake  - Collection of images, videos and audio files

• Snake in the Clouds: A new nearby dwarf galaxy in the Magellanic bridge . arxiv : 1804.06430

Individual evidence

1. ↑ Sergey E. Koposov, Matthew G. Walker, Vasily Belokurov, Andrew R. Casey, Alex Geringer-Sameth, Dougal Mackey, Gary Da Costa, Denis Erkal, Prashin Jethwa, Mario Mateo, Edward W. Olszewski, John I. Bailey III : Snake in the Clouds: A new nearby dwarf galaxy in the Magellanic bridge . In: Cornell University Library . April 17, 2018. arxiv : 1804.06430v1 .