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| Query : 2017MNRAS.470.2702K |
2017MNRAS.470.2702K - Mon. Not. R. Astron. Soc., 470, 2702-2709 (2017/September-3)
Gaia 1 and 2. A pair of new Galactic star clusters.
KOPOSOV S.E., BELOKUROV V. and TORREALBA G.
Abstract (from CDS):
We present the results of the very first search for faint Milky Way satellites in the Gaia data. Using stellar positions only, we are able to re-discover objects detected in much deeper data as recently as the last couple of years. While we do not identify new prominent ultrafaint dwarf galaxies, we report the discovery of two new star clusters, Gaia 1 and Gaia 2. Gaia 1 is particularly curious, as it is a massive (2.2 x 104 M☉), large (∼9 pc) and nearby (4.6 kpc) cluster, situated 10 arcmin away from the brightest star on the sky, Sirius! Even though this satellite is detected at significance in excess of 10, it was missed by previous sky surveys. We conclude that Gaia possesses powerful and unique capabilities for satellite detection, thanks to its unrivalled angular resolution and highly efficient object classification.
Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s): catalogues - Galaxy: general - globular clusters: general - Galaxy: halo - Galaxy: structure - Galaxy: structure
Nomenclature: Table 1: [KBT2017] Gaia N (Nos 1-2).
Simbad objects: 10
| Number of rows : 10 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | [KBT2017] Gaia 2 | OpC | 01 52 29.9 | +53 01 57 | ~ | 20 | 0 | |||||
| 2 | NAME Reticulum II | G | 03 35 42.1 | -54 02 57 | ~ | 375 | 0 | |||||
| 3 | Cl Berkeley 25 | OpC | 06 41 16.1 | -16 28 58 | ~ | 67 | 0 | |||||
| 4 | * alf CMa | SB* | 06 45 08.91728 | -16 42 58.0171 | -1.51 | -1.46 | -1.46 | -1.46 | -1.43 | A0mA1Va | 1610 | 0 |
| 5 | [KBT2017] Gaia 1 | OpC | 06 45 53.6 | -16 43 34 | ~ | 20 | 0 | |||||
| 6 | NAME Crater II Dwarf Galaxy | G | 11 49 14 | -18 24.8 | ~ | 176 | 0 | |||||
| 7 | NAME CVn II dSph | G | 12 57 09.6 | +34 19 12 | 16.1 | ~ | 287 | 2 | ||||
| 8 | NAME CVn I dSph | G | 13 28 03.5 | +33 33 21 | 13.1 | ~ | 352 | 1 | ||||
| 9 | NAME Bootes Dwarf Spheroidal Galaxy | G | 14 00 00.0 | +14 30 00 | 12.8 | ~ | 491 | 0 | ||||
| 10 | Z 318-18 | G | 15 09 08.0 | +67 13 21 | 13.60 | 10.6 | ~ | 1459 | 0 |
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