2012MNRAS.425L.101D

Query : 2012MNRAS.425L.101D

2012MNRAS.425L.101D - Mon. Not. R. Astron. Soc., 425, L101-L105 (2012/September-1)

The stretching of Hercules.

DEASON A.J., BELOKUROV V., EVANS N.W., WATKINS L.L. and FELLHAUER M.

Abstract (from CDS):

We present VLT/FORS2 spectroscopy of candidate blue horizontal branch (BHB) stars in the vicinity of the Hercules ultrafaint dwarf galaxy. We identify eight convincing Hercules BHB members, and a further five stars with similar systemic velocities to that of Hercules, but ∼ 0.5 kpc from the centre of the galaxy along its major axis. It is likely that these stars once belonged to Hercules, but have been tidally stripped and are now unbound. We emphasize the usefulness of looking for any gradient in the systemic velocity of this stretched system, which would further support our interpretation of the origin of its elongated and distended morphology.

E-mail: \email (AJD); \email (VB); \email (NWE)


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): galaxies: dwarf - galaxies: interactions - galaxies: kinematics and dynamics - Local Group

Nomenclature: Table 2: [DBE2012] FF-NN N=17 among (Nos F1-09 to F1-21, F2-01 to F2-20, F3-02 to F3-07).

Simbad objects: 26

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Number of rows : 26
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 UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
2 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
3 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
4 SDSS J163008.60+125215.5 HB* 16 30 08.609 +12 52 15.53           ~ 1 0
5 SDSS J163018.96+125301.3 HB* 16 30 18.9733333970 +12 53 01.325704720           ~ 1 0
6 [AFK2009] 35570 HB* 16 30 19.250 +12 57 13.32           ~ 2 0
7 SDSS J163053.80+125041.9 * 16 30 53.8027163064 +12 50 41.926148916           ~ 1 0
8 SDSS J163058.74+124540.5 RG* 16 30 58.7450854896 +12 45 40.565587788           ~ 1 0
9 [AFK2009] 42134 HB* 16 30 59.589 +12 46 59.44           ~ 2 0
10 [AFK2009] 42113 RR* 16 30 59.8353658608 +12 46 02.783726256           ~ 8 0
11 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
12 [MRM2012] V1 RR* 16 31 02.1036570864 +12 47 33.657418716   21.27 21.68     ~ 3 0
13 SDSS J163102.52+124947.0 HB* 16 31 02.521 +12 49 47.09           ~ 1 0
14 SDSS J163104.17+124704.8 HB* 16 31 04.174 +12 47 04.83           ~ 1 0
15 SDSS J163104.76+124420.2 * 16 31 04.767 +12 44 20.28           ~ 1 0
16 SDSS J163106.09+124742.2 HB* 16 31 06.095 +12 47 42.27           ~ 1 0
17 SDSS J163134.00+124627.4 RG* 16 31 34.007 +12 46 27.44           ~ 1 0
18 [AFK2009] 40435 HB* 16 31 38.2316258232 +12 44 36.320013960           ~ 4 0
19 SDSS J163146.94+124805.0 RG* 16 31 46.943 +12 48 04.89           ~ 1 0
20 SDSS J163150.96+124454.6 HB* 16 31 50.963 +12 44 54.67           ~ 1 0
21 SDSS J163152.81+124447.8 HB* 16 31 52.819 +12 44 47.87           ~ 1 0
22 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
23 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
24 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
25 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
26 NAME Local Group GrG ~ ~           ~ 9325 0

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