2015ApJ...804..134R

Query : 2015ApJ...804..134R

2015ApJ...804..134R - Astrophys. J., 804, 134 (2015/May-2)

Stellar substructures around the Hercules dwarf spheroidal galaxy.

RODERICK T.A., JERJEN H., MacKEY A.D. and DA COSTA G.S.

Abstract (from CDS):

We present deep g and i band Dark Energy Camera stellar photometry of the Hercules Milky Way satellite galaxy, and its surrounding field, out to a radial distance of 5.4 times the tidal radius. We have identified nine extended stellar substructures associated with the dwarf; preferentially distributed along the major axis of the galaxy. Two significant over-densities lie outside the 95% confidence band for the likely orbital path of the galaxy and appear to be free-floating tidal debris. We estimate the luminosity of the new stellar substructures, and find that approximately the same amount of stellar flux is lying in these extended structures as inside the main body of Hercules. We also analyze the distribution of candidate blue-horizontal-branch stars and find agreement with the alignment of the substructures at a confidence level greater than 98%. Our analysis provides a quantitative demonstration that Hercules is a strongly tidally disrupted system, with noticeable stellar features at least 1.9 kpc away from the galaxy.

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

Nomenclature: Fig. 8, Tables 2-3: [RJM2015] OD NN.N (Nos 1-13, 13.1-13.3, 14-16, 16.1-16.2, 17-24).

Simbad objects: 37

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Number of rows : 37
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
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 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
6 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
7 [RJM2015] OD 20 PoG 16 28.0 +13 15           ~ 2 0
8 [RJM2015] OD 16.2 PoG 16 28.4 +12 55           ~ 2 0
9 [RJM2015] OD 23 PoG 16 28.5 +13 28           ~ 2 0
10 [RJM2015] OD 16.1 PoG 16 28.7 +12 52           ~ 2 0
11 [RJM2015] OD 13.3 PoG 16 29.5 +12 59           ~ 2 0
12 [RJM2015] OD 13.2 PoG 16 29.8 +12 52           ~ 2 0
13 [RJM2015] OD 6 PoG 16 30.0 +12 20           ~ 2 0
14 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
15 [RJM2015] OD 24 PoG 16 32.5 +13 51           ~ 2 0
16 [RJM2015] OD 9 PoG 16 32.6 +12 31           ~ 2 0
17 [RJM2015] OD 8 PoG 16 33.8 +12 24           ~ 2 0
18 [RJM2015] OD 15 PoG ~ ~           ~ 1 0
19 [RJM2015] OD 16 PoG ~ ~           ~ 1 0
20 [RJM2015] OD 13.1 PoG ~ ~           ~ 1 0
21 [RJM2015] OD 13 PoG ~ ~           ~ 1 0
22 [RJM2015] OD 17 PoG ~ ~           ~ 1 0
23 [RJM2015] OD 18 PoG ~ ~           ~ 1 0
24 [RJM2015] OD 19 PoG ~ ~           ~ 1 0
25 [RJM2015] OD 2 PoG ~ ~           ~ 1 0
26 [RJM2015] OD 12 PoG ~ ~           ~ 1 0
27 [RJM2015] OD 21 PoG ~ ~           ~ 1 0
28 [RJM2015] OD 22 PoG ~ ~           ~ 1 0
29 [RJM2015] OD 11 PoG ~ ~           ~ 1 0
30 [RJM2015] OD 10 PoG ~ ~           ~ 1 0
31 [RJM2015] OD 3 PoG ~ ~           ~ 1 0
32 [RJM2015] OD 4 PoG ~ ~           ~ 1 0
33 [RJM2015] OD 5 PoG ~ ~           ~ 1 0
34 [RJM2015] OD 1 PoG ~ ~           ~ 1 0
35 [RJM2015] OD 7 PoG ~ ~           ~ 1 0
36 [RJM2015] OD 14 PoG ~ ~           ~ 1 0
37 NAME Local Group GrG ~ ~           ~ 9325 0

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