2014MNRAS.441.2124B


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST03:36:20

2014MNRAS.441.2124B - Mon. Not. R. Astron. Soc., 441, 2124-2133 (2014/July-1)

ATLAS lifts the Cup: discovery of a new Milky Way satellite in Crater.

BELOKUROV V., IRWIN M.J., KOPOSOV S.E., EVANS N.W., GONZALEZ-SOLARES E., METCALFE N. and SHANKS T.

Abstract (from CDS):

We announce the discovery of a new Galactic companion found in data from the ESO VST ATLAS survey, and followed up with deep imaging on the 4-m William Herschel Telescope. The satellite is located in the constellation of Crater (the Cup) at a distance of ∼ 170kpc. Its half-light radius is rh = 30 pc and its luminosity is MV = -5.5. The bulk of its stellar population is old and metal poor. We would probably have classified the newly discovered satellite as an extended globular cluster were it not for the presence of a handful of blue loop stars and a sparsely populated red clump. The existence of the core helium burning population implies that star formation occurred in Crater perhaps as recently as 400 Myr ago. No globular cluster has ever accomplished the feat of prolonging its star formation by several Gyr. Therefore, if our hypothesis that the blue bright stars in Crater are blue loop giants is correct, the new satellite should be classified as a dwarf galaxy with unusual properties. Note that only 10°to the north of Crater, two ultrafaint galaxies Leo IV and Leo V orbit the Galaxy at approximately the same distance. This hints that all three satellites may once have been closely associated before falling together into the Milky Way halo.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): Stars: Hertzsprung-Russell and colour-magnitude diagrams - Galaxy: fundamental parameters - Galaxy: globular clusters: general - Galaxy: halo - Galaxies: dwarf

Simbad objects: 27

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Number of rows : 27

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 635 1
2 NAME Andromeda XXX G 00 36 34.90 +49 38 48.0           ~ 45 0
3 NGC 185 Sy2 00 38 57.970 +48 20 14.56   9.10 9.2     ~ 743 1
4 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11311 1
5 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 366 0
6 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 353 0
7 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1534 1
8 NAME E 1 GlC 03 55 02.5 -49 36 52           ~ 185 0
9 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1024 0
10 Koposov 2 GlC 07 58 17.00 +26 15 19.4           ~ 60 1
11 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 326 0
12 NAME Leo T dSph G 09 34 53.4 +17 03 05     15.1     ~ 322 0
13 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 378 1
14 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 268 0
15 NAME Leo B G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 761 0
16 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 325 1
17 NAME Leo V G 11 31 09.60 +02 13 12.0     16.0     ~ 171 0
18 NAME Leo IV Dwarf Galaxy G 11 32 57.0 -00 32 00     15.1     ~ 335 1
19 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 66 1
20 Koposov 1 GlC 11 59 18.40 +12 15 35.8           ~ 59 0
21 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 336 0
22 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1943 0
23 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1202 1
24 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1836 2
25 V* RR Lyr RR* 19 25 27.9123232234 +42 47 03.690634101   7.36   7.6   A8-F7 890 0
26 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 221 0
27 NAME Local Group GrG ~ ~           ~ 7264 0

    Equat.    Gal    SGal    Ecl

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2021.05.18-03:36:21

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