2009AJ....137..450W


Query : 2009AJ....137..450W

2009AJ....137..450W - Astron. J., 137, 450-469 (2009/January-0)

The invisibles: a detection algorithm to trace the faintest Milky Way satellites.

WALSH S.M., WILLMAN B. and JERJEN H.

Abstract (from CDS):

A specialized data-mining algorithm has been developed using wide-field photometry catalogs, enabling systematic and efficient searches for resolved, extremely low surface brightness satellite galaxies in the halo of the Milky Way (MW). Tested and calibrated with the Sloan Digital Sky Survey Data Release 6 (SDSS-DR6) we recover all 15 MW satellites recently detected in SDSS, six known MW/Local Group dSphs in the SDSS footprint, and 19 previously known globular and open clusters. In addition, 30 point-source overdensities have been found that correspond to no cataloged objects. The detection efficiencies of the algorithm have been carefully quantified by simulating more than three million model satellites embedded in star fields typical of those observed in SDSS, covering a wide range of parameters including galaxy distance, scale length, luminosity, and Galactic latitude. We present several parameterizations of these detection limits to facilitate comparison between the observed MW satellite population and predictions. We find that all known satellites would be detected with >90% efficiency over all latitudes spanned by DR6 and that the MW satellite census within DR6 is complete to a magnitude limit of MV ~ -6.5 and a distance of 300 kpc. Assuming all existing MW satellites contain an appreciable old stellar population and have sizes and luminosities comparable with currently known companions, we predict lower and upper limit totals of 52 and 340 MW dwarf satellites within ∼260 kpc if they are uniformly distributed across the sky. This result implies that many MW satellites still remain undetected. Identifying and studying these elusive satellites in future survey data will be fundamental to test the dark matter distribution on kpc scales.

Abstract Copyright:

Journal keyword(s): dark matter - galaxies: dwarf - Local Group

Simbad objects: 57

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Number of rows : 57
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12678 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11178 1
3 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1366 4
4 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 534 2
5 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1748 1
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17478 0
7 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1127 0
8 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 935 0
9 Koposov 2 GlC 07 58 17.00 +26 15 19.4           ~ 69 1
10 NGC 2682 OpC 08 51 23.0 +11 48 50           ~ 2342 0
11 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 376 0
12 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 391 0
13 NAME Leo A G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 616 0
14 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 329 1
15 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 467 1
16 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1209 1
17 NAME Sextans dSph G 10 13 02.9 -01 36 53   12 10.4     ~ 857 0
18 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 320 0
19 NAME UMa Region reg 11 00 +50.0           ~ 328 0
20 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 841 0
21 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 355 1
22 NAME Leo V G 11 31 09.60 +02 13 12.0     16.0     ~ 204 0
23 NAME Leo IV Dwarf Galaxy G 11 32 57.0 -00 32 00     15.1     ~ 384 1
24 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 430 0
25 Koposov 1 GlC 11 59 18.40 +12 15 35.8           ~ 69 0
26 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 575 0
27 NAME UMa Y G 12 11 57.6 +53 35 24           ~ 2 0
28 NAME Vir Z G 12 20 19.2 -01 21 00           ~ 3 0
29 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6660 0
30 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 454 1
31 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7221 3
32 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1182 0
33 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 264 2
34 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 839 0
35 NAME CVn W G 13 16 04.6 +33 15 00           ~ 2 0
36 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 623 0
37 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 328 1
38 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2481 0
39 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 241 0
40 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 439 0
41 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 830 0
42 NAME UMi Galaxy G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1363 0
43 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 737 1
44 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1982 0
45 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 578 3
46 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 370 0
47 NAME Her X G 16 27 45.6 +29 27 00           ~ 3 0
48 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 346 1
49 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2196 0
50 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 368 0
51 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1333 1
52 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14463 0
53 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 308 1
54 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3143 0
55 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1032 1
56 NAME PegDIG G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 474 1
57 NAME Local Group GrG ~ ~           ~ 8415 0

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