Aquarius II dwarf galaxy

Database links to Aquarius II dwarf galaxy

Galaxy Aquarius II dwarf galaxy
Aquarius 2
AladinLite
Constellation	Aquarius
Position equinox :  J2000.0 , epoch : J2000.0
Right ascension	22 h 33 m 55.512 s
declination	-09 ° 19 ′ 38.64 ″
Appearance
Morphological type	dSph
Brightness  (visual)	(20.16 ± 0.07) mag
Surface brightness	21.3 mag / arcmin²
Physical data
Affiliation	Local group
Radial velocity	v ⊙ = (- 71.1 ± 2.5) v GSR = 49 km / s
distance	(351,800 ± 10,800) Lj / (107,900 ± 3,300) pc
Absolute brightness	(−4.36 ± 0.14) mag
Metallicity [Fe / H]	(−2.3 ± 0.5)
history
discovery	VST ATLAS Survey
Discovery date	2016
Catalog names
Aqr II dSph
Galaxy with very low brightness and surface brightness

The Aquarius II dwarf galaxy , also known as Aquarius II or Aquarius 2 for short , is a dwarf galaxy of the type dSph discovered in 2016 in the constellation Aquarius in the Local Group and one of the satellite galaxies of the Milky Way .

properties

Aqr II dSph with a surface brightness of one of the most difficult galaxies to detect with the means of observation of 2016. The dwarf galaxy has a half-light radius of r _h = (5.1 ± 0.8) ′, which corresponds absolutely to (159 ± 24)  pc . The galaxy has a stellar velocity dispersion of . ${\displaystyle \mu =30,2{\frac {mag}{arcsec^{2}}}}$ ${\displaystyle \sigma _{v}=5,4_{-0,9}^{+3,4}{\frac {km}{s}}}$

additional

• List of galaxies in the local group

Web links

Commons : Aquarius constellation  - collection of images, videos and audio files

• At the survey limits: discovery of the Aquarius 2 dwarf galaxy in the VST ATLAS and the SDSS data at: arxiv.org

Individual evidence

1. ^ NED
2. ↑ ^{a b} G. Torrealba, SE Koposov. V. Belokurov, M. Irwin, M. Collins, M. Spencer, R. Ibata, M. Matteo, A. Bonaca, P. Jethwa: At the survey limits: discovery of the Aquarius 2 dwarf galaxy in the VST ATLAS and the SDSS data . In: Monthly Notices of the Royal Astronomical Society . 463, No. 1, September, pp. 712-722.