2015MNRAS.453..541A

Query : 2015MNRAS.453..541A

2015MNRAS.453..541A - Mon. Not. R. Astron. Soc., 453, 541-560 (2015/October-2)

Detection of satellite remnants in the Galactic halo with Gaia- III. Detection limits for ultrafaint dwarf galaxies.

ANTOJA T., MATEU C., AGUILAR L., FIGUERAS F., ANTICHE E., HERNANDEZ-PEREZ F., BROWN A.G.A., VALENZUELA O., APARICIO A., HIDALGO S. and VELAZQUEZ H.

Abstract (from CDS):

We present a method to identify ultrafaint dwarf galaxies (UFDGs) candidates in the halo of the Milky Way using the future Gaia catalogue and we explore its detection limits and completeness. The method is based on the Wavelet Transform and searches for overdensities in the combined space of sky coordinates and proper motions, using kinematics in the search for the first time. We test the method with a Gaia mock catalogue that has the Gaia Universe Model Snapshot as a background, and use a library of around 30 000 UFDGs simulated as Plummer spheres with a single stellar population. For the UFDGs, we use a wide range of structural and orbital parameters that go beyond the range spanned by real systems, where some UFDGs may remain undetected. We characterize the detection limits as function of the number of observable stars by Gaia in the UFDGs with respect to that of the background and their apparent sizes in the sky and proper motion planes. We find that the addition of proper motions in the search improves considerably the detections compared to a photometric survey at the same magnitude limit. Our experiments suggest that Gaia will be able to detect UFDGs that are similar to some of the known UFDGs even if the limit of Gaia is around 2 mag brighter than that of SDSS, with the advantage of having a full-sky catalogue. We also see that Gaia could even find some UFDGs that have lower surface brightness than the SDSS limit.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): methods: data analysis - Galaxy: formation - Galaxy: halo - galaxies: dwarf - dark matter - astrometry

Simbad objects: 23

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Number of rows : 23
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 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
2 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
3 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
4 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
5 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
6 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
7 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
8 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
9 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
10 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
11 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
12 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
13 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
14 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
15 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
16 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
17 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
18 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
19 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
20 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
21 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
22 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
23 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0

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