2016MNRAS.463..712T

Query : 2016MNRAS.463..712T

2016MNRAS.463..712T - Mon. Not. R. Astron. Soc., 463, 712-722 (2016/November-3)

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

TORREALBA G., KOPOSOV S.E., BELOKUROV V., IRWIN M., COLLINS M., SPENCER M., IBATA R., MATEO M., BONACA A. and JETHWA P.

Abstract (from CDS):

We announce the discovery of the Aquarius 2 dwarf galaxy, a new distant satellite of the Milky Way, detected on the fringes of the VLT Survey Telescope (VST) ATLAS and the Sloan Digital Sky Survey (SDSS) surveys. The object was originally identified as an overdensity of red giant branch stars, but chosen for subsequent follow-up based on the presence of a strong blue horizontal branch, which was also used to measure its distance of ∼110 kpc. Using deeper imaging from the Inamori-Magellan Areal Camera and Spectrograph camera on the 6.5m Baade and spectroscopy with DEep Imaging Multi-Object Spectrograph on Keck, we measured the satellite's half-light radius 5.1 ± 0.8 arcmin, or ∼160 pc at this distance, and its stellar velocity dispersion of 5.4^{+3.4}_{-0.9} km s–1. With µ = 30.2 mag arcsec–2 and MV = -4.36, the new satellite lies close to two important detection limits: one in surface brightness; and one in luminosity at a given distance, thereby making Aquarius 2 one of the hardest dwarfs to find.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Galaxy: halo - galaxies: dwarf - galaxies: dwarf

Nomenclature: NAME Aquarius 2 N=1. Table 2: [TKB2016] RGBN (Nos RGB1-RGB9), [TKB2016] BHBN (Nos BHB1-BHB6).

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Tuc IV G 00 02.9 -60 51           ~ 69 0
2 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 152 0
3 NAME Magellanic Stream HVC 00 32 -30.0           ~ 971 1
4 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12645 1
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11146 1
6 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 262 0
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7065 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17432 0
9 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1125 0
10 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 328 1
11 NAME Leo V G 11 31 09.60 +02 13 12.0     16.0     ~ 203 0
12 NAME Leo IV Dwarf Galaxy G 11 32 57.0 -00 32 00     15.1     ~ 383 1
13 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 91 1
14 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 137 0
15 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 241 0
16 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 437 0
17 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 345 1
18 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2187 2
19 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 74 0
20 NAME Ind II G 20 38.9 -46 10           ~ 27 0
21 [TKB2016] RGB9 RG* 22 33 44.1983285616 -09 13 58.972211436           ~ 1 0
22 [TKB2016] RGB2 RG* 22 33 48.1639762152 -09 21 42.236486928           ~ 1 0
23 [TKB2016] RGB1 RG* 22 33 49.1956592664 -09 22 21.358504020           ~ 1 0
24 [TKB2016] RGB3 RG* 22 33 50.5982057712 -09 18 54.882418464           ~ 2 0
25 [TKB2016] RGB7 RG* 22 33 50.6473876416 -09 14 54.097642716           ~ 1 0
26 [TKB2016] RGB6 RG* 22 33 50.90 -09 15 53.9           ~ 1 0
27 [TKB2016] RGB8 RG* 22 33 52.6961446440 -09 17 09.068914536           ~ 2 0
28 [TKB2016] RGB5 RG* 22 33 54.9199967280 -09 17 16.660390740           ~ 1 0
29 [TKB2016] BHB5 HB* 22 33 55.47 -09 17 35.3           ~ 1 0
30 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 52 0
31 [TKB2016] BHB4 HB* 22 33 58.0032426696 -09 19 18.661744632           ~ 1 0
32 [TKB2016] BHB1 HB* 22 33 58.0577787000 -09 26 17.720550744           ~ 1 0
33 [TKB2016] BHB2 HB* 22 33 58.2937105008 -09 24 28.376862516           ~ 1 0
34 [TKB2016] BHB3 HB* 22 33 59.46 -09 24 37.2           ~ 1 0
35 [TKB2016] RGB4 RG* 22 33 59.8655257512 -09 21 38.060684316           ~ 2 0
36 [TKB2016] BHB6 HB* 22 34 00.28 -09 18 28.8           ~ 1 0
37 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 155 0
38 NAME Peg dSph GiG 23 51 46.4 +24 35 11   14.5 13.2     ~ 236 2
39 NAME Triangulum-Andromeda Region reg ~ ~           ~ 86 0

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