Antlia 2

Database links to Antlia 2

Galaxy Antlia 2
AladinLite
Constellation	Air pump
Position equinox :  J2000.0 , epoch : J2000.0
Right ascension	09 h 35 m 33 s
declination	-36 ° 46 ′ 2.28 ″
Appearance
Morphological type	dE3
Brightness  (visual)	20.6 ± 0.11 mag
Brightness  (B-band)	−9.03 ± 0.15 mag
Angular expansion	1.27 ± 0.12
Physical data
Affiliation	Local group
distance	430000  Lj
Dimensions	(8.8 ± 1.2) × 10 5 M ☉
diameter	10,000 ly
history
Discovery date	2018
Catalog names

Antlia 2 is a gravitationally to the Milky Way bound dwarf galaxy in the constellation air pump . Its expansion in the sky extends over 1.27 °. At a distance of about 430,000 light years, their diameter is therefore almost 10,000 light years.

Antlia 2 is an ultra-diffuse galaxy and by far the most diffuse of these galaxies to date. It is 100 times fainter than the most scattered of the galaxies of this type observed so far.

Antlia 2 was discovered in 2018 using data mining methods from data in the Gaia star catalog. The astronomers found an unusual accumulation of RR Lyrae variables in the constellation Air Pump ( Antlia ) , which gave the crucial clue to the structure hidden behind it.

Web links

• G. Torrealba, V. Belokurov, SE Koposov, TS Li, ​​MG Walker, JL Sanders, A. Geringer-Sameth, DB Zucker, K. Kuehn, NW Evans, W. Dehnen: The hidden giant: Discovery of an enormous Galactic dwarf satellite in Gaia DR2 . In: Astrophysics. Solar and Stellar Astrophysics . November 9, 2018, arxiv : 1811.04082 .
• Bruce Dorminey: ESA's Gaia Spacecraft Spots Ghost Galaxy Lurking In Milky Way's Outskirts . In: Forbes , November 18, 2018

Individual evidence

1. ↑ Daniel Fischer: Ghostly Dwarf Galaxy Antlia 2: pretty close, huge - and almost invisible . In: Adventure Astronomy , November 22, 2018