2015ApJ...810...56K

Query : 2015ApJ...810...56K

2015ApJ...810...56K - Astrophys. J., 810, 56 (2015/September-1)

Spectroscopic confirmation of the dwarf galaxies Hydra II and Pisces II and the globular cluster Laevens 1.

KIRBY E.N., SIMON J.D. and COHEN J.G.

Abstract (from CDS):

We present Keck/DEIMOS spectroscopy of stars in the recently discovered Milky Way satellites Hydra II, Pisces II, and Laevens 1. We measured a velocity dispersion of km/s for Pisces II, but we did not resolve the velocity dispersions of Hydra II or Laevens 1. We marginally resolved the metallicity dispersions of Hydra II and Pisces II but not Laevens 1. Furthermore, Hydra II and Pisces II obey the luminosity-metallicity relation for Milky Way dwarf galaxies ( and, respectively), whereas Laevens 1 does not (). The kinematic and chemical properties suggest that Hydra II and Pisces II are dwarf galaxies, and Laevens 1 is a globular cluster. We determined that two of the previously observed blue stars near the center of Laevens 1 are not members of the cluster. A third blue star has ambiguous membership. Hydra II has a radial velocity km/s, similar to the leading arm of the Magellanic stream. The mass-to-light ratio for Pisces II is. It is not among the most dark matter-dominated dwarf galaxies, but it is still worthy of inclusion in the search for gamma-rays from dark matter self-annihilation.

Abstract Copyright: ∼

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

Nomenclature: Table 2: [KSC2015] Hydra II NNNNNN N=34 among (Nos 183842-202029), [KSC2015] Laevens 1 NNN N=14 among (Nos 93-1997).

Simbad objects: 85

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Number of rows : 85
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 NAME Magellanic Stream HVC 00 32 -30.0           ~ 971 1
2 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 262 0
3 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1743 1
4 NAME Hor I G 02 55 31.7 -54 07 08           ~ 141 0
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7066 0
6 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 309 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
8 HD 38230 PM* 05 46 01.8857259248 +37 17 04.738728231   8.19   6.8   K0V 158 0
9 HD 88609 Pe* 10 14 28.9853799600 +53 33 39.342740796 9.930 9.540 8.620 7.78 7.15 G5IIIw 202 0
10 NAME Leo IV Dwarf Galaxy G 11 32 57.0 -00 32 00     15.1     ~ 383 1
11 [KSC2015] Laevens 1 302 * 11 36 13.5661121760 -10 53 03.562439604           ~ 1 0
12 [KSC2015] Laevens 1 374 * 11 36 13.7684802816 -10 52 48.892484316           ~ 1 0
13 NAME Crater J113613-105227 * 11 36 13.8985761528 -10 52 27.325442496           ~ 3 0
14 [KSC2015] Laevens 1 378 * 11 36 14.53 -10 52 43.7           ~ 1 0
15 NAME Crater J113615-105244 * 11 36 15.9418811424 -10 52 44.036887728           ~ 3 0
16 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 91 1
17 [KSC2015] Laevens 1 1710 * 11 36 16.52 -10 52 46.7           ~ 2 0
18 [KSC2015] Laevens 1 1715 * 11 36 16.59 -10 52 46.2           ~ 1 0
19 [KSC2015] Laevens 1 367 * 11 36 16.89 -10 52 43.7           ~ 1 0
20 [KSC2015] Laevens 1 1717 * 11 36 17.2798340040 -10 52 46.305177852           ~ 1 0
21 [KSC2015] Laevens 1 1972 * 11 36 17.70 -10 52 08.0           ~ 1 0
22 [KSC2015] Laevens 1 1997 * 11 36 18.37 -10 52 00.7           ~ 1 0
23 [KSC2015] Laevens 1 1684 * 11 36 18.6030704040 -10 52 49.660153896           ~ 2 0
24 [KSC2015] Laevens 1 399 * 11 36 19.5964328400 -10 52 37.305590160           ~ 2 0
25 [KSC2015] Laevens 1 963 * 11 36 20.1312640584 -10 52 38.570397708           ~ 1 0
26 HD 103095 Pe* 11 52 58.7673387755 +37 43 07.254113125 7.38 7.20 6.45 5.80 5.35 K1V_Fe-1.5 802 1
27 [KSC2015] Hydra II 196246 * 12 21 27.4974052248 -31 57 22.606895592           ~ 1 0
28 [KSC2015] Hydra II 184647 * 12 21 28.1476040328 -32 06 36.630011772           ~ 1 0
29 [KSC2015] Hydra II 199452 * 12 21 30.1694206464 -31 55 58.088636040           ~ 1 0
30 [KSC2015] Hydra II 189524 * 12 21 32.70 -32 03 51.5           ~ 1 0
31 [KSC2015] Hydra II 188838 * 12 21 33.1805769576 -32 04 29.277043176           ~ 1 0
32 [KSC2015] Hydra II 194103 * 12 21 34.7210260128 -31 59 21.717696444           ~ 1 0
33 [KSC2015] Hydra II 193538 * 12 21 35.9097205008 -31 59 53.943591804           ~ 1 0
34 [KSC2015] Hydra II 198021 * 12 21 36.2950382112 -31 56 38.061548916           ~ 1 0
35 [KSC2015] Hydra II 195726 * 12 21 36.7235493744 -31 57 54.077856408           ~ 1 0
36 [KSC2015] Hydra II 190646 * 12 21 38.1797989608 -32 02 38.187604392           ~ 1 0
37 [KSC2015] Hydra II 194563 * 12 21 38.4936715248 -31 58 56.353266480           ~ 1 0
38 [KSC2015] Hydra II 191521 * 12 21 39.6740280840 -32 01 48.864702072           ~ 1 0
39 [KSC2015] Hydra II 191385 * 12 21 40.08 -32 01 57.7           ~ 1 0
40 [KSC2015] Hydra II 192206 * 12 21 40.3598612880 -32 01 12.036616608           ~ 1 0
41 [KSC2015] Hydra II 193286 * 12 21 40.96 -32 00 07.0           ~ 1 0
42 [KSC2015] Hydra II 194920 * 12 21 41.02 -31 58 34.4           ~ 1 0
43 [KSC2015] Hydra II 194405 * 12 21 41.0347644432 -31 59 04.067319696           ~ 1 0
44 [KSC2015] Hydra II 189086 * 12 21 41.79 -32 04 15.9           ~ 1 0
45 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 97 0
46 [KSC2015] Hydra II 194325 * 12 21 42.4970228832 -31 59 10.003069428           ~ 1 0
47 [KSC2015] Hydra II 197616 * 12 21 42.6043448112 -31 56 44.197927872           ~ 1 0
48 [KSC2015] Hydra II 201098 * 12 21 42.7582443264 -31 54 26.536421520           ~ 1 0
49 [KSC2015] Hydra II 196797 * 12 21 42.79 -31 57 04.2           ~ 1 0
50 [KSC2015] Hydra II 195247 * 12 21 44.45 -31 58 21.0           ~ 1 0
51 [KSC2015] Hydra II 196052 * 12 21 44.57 -31 57 37.6           ~ 1 0
52 [KSC2015] Hydra II 200162 * 12 21 44.6386566240 -31 55 17.671286820           ~ 1 0
53 [KSC2015] Hydra II 194736 * 12 21 44.65 -31 58 47.6           ~ 1 0
54 [KSC2015] Hydra II 193869 * 12 21 45.9439793952 -31 59 34.210974444           ~ 1 0
55 [KSC2015] Hydra II 183842 * 12 21 46.0923688392 -32 07 02.864165664           ~ 1 0
56 [KSC2015] Hydra II 202029 * 12 21 47.09 -31 53 36.0           ~ 1 0
57 [KSC2015] Hydra II 197129 * 12 21 48.34 -31 56 52.2           ~ 1 0
58 [KSC2015] Hydra II 192059 * 12 21 48.39 -32 01 21.8           ~ 1 0
59 HD 109995 HB* 12 38 47.5985869392 +39 18 31.626312732 7.83 7.68   7.6   A0V 225 0
60 * d01 Vir PM* 12 41 57.1172895264 +06 48 23.817528576   5.558 5.573     A2V 53 0
61 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3427 0
62 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 854 0
63 HD 151288 PM* 16 45 06.3505410601 +33 30 33.213816014   9.48 8.11 8.388   K7.5Ve 182 0
64 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2116 0
65 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14415 0
66 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1379 0
67 HD 181828 * 19 20 33.0559684632 +35 11 09.456123912 5.81 6.188 6.290     B9V 54 0
68 HD 187111 Pe* 19 48 39.5744746680 -12 07 19.738101036   8.92 7.75     G8wF8III/IV 142 0
69 BD-18 5550 Pe* 19 58 49.7371417608 -18 12 11.140126164 10.18 10.03 9.35 9.04 8.74 CEMP-no 173 0
70 HD 345957 PM* 20 10 48.1625876064 +23 57 54.510596568   9.36   8.6   G0V: 143 0
71 [SSW2012] Pisces II 9004 * 22 58 17.5372306848 +05 55 17.239848852           ~ 2 0
72 [SSW2012] Pisces II 9618 * 22 58 20.35 +05 58 08.8           ~ 1 0
73 [SSW2012] Pisces II 9833 * 22 58 21.22 +05 57 20.3           ~ 2 0
74 [SSW2012] Pisces II 10215 * 22 58 22.88 +05 57 35.5           ~ 1 0
75 [SSW2012] Pisces II 10694 * 22 58 25.0754200608 +05 57 20.109688668           ~ 7 0
76 [SSW2012] Pisces II 11592 * 22 58 28.7572365336 +05 56 56.779800504           ~ 1 0
77 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 258 0
78 [SSW2012] Pisces II 12924 * 22 58 34.1145845664 +05 57 43.354980468           ~ 2 0
79 [SSW2012] Pisces II 13387 * 22 58 35.91 +05 57 22.4           ~ 2 0
80 [SSW2012] Pisces II 13560 * 22 58 36.71 +05 58 06.2           ~ 2 0
81 [SSW2012] Pisces II 13757 * 22 58 37.5071951664 +05 56 24.555444900           ~ 1 0
82 [SSW2012] Pisces II 14179 * 22 58 39.36 +05 56 00.7           ~ 2 0
83 [SSW2012] Pisces II 16716 * 22 58 51.1964507184 +05 59 56.936782896           ~ 1 0
84 [SSW2012] Pisces II 17500 * 22 58 54.7965400128 +05 57 47.292855408           ~ 1 0
85 NAME Local Group GrG ~ ~           ~ 8391 0

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