2020ApJ...892...27M

Query : 2020ApJ...892...27M

2020ApJ...892...27M - Astrophys. J., 892, 27-27 (2020/March-3)

Stellar density profiles of dwarf spheroidal galaxies.

MOSKOWITZ A.G. and WALKER M.G.

Abstract (from CDS):

We apply a flexible parametric model, a combination of generalized Plummer profiles, to infer the shapes of the stellar density profiles of the Milky Way's satellite dwarf spheroidal galaxies (dSphs). We apply this model to 40 dSphs using star counts from the Sloan Digital Sky Survey, PanStarrs-1 Survey, Dark Energy Survey, and Dark Energy Camera Legacy Survey. Using mock data, we examine systematic errors associated with modeling assumptions and identify conditions under which our model can identify "non-standard" stellar density profiles that have central cusps and/or steepened outer slopes. Applying our model to real dwarf spheroidals, we do not find evidence for centrally cusped density profiles among the fifteen Milky Way satellites for which our tests with mock data indicate there would be sufficient detectability. We do detect steepened (with respect to a standard Plummer model) outer profiles in several dSphs-Fornax, Leo I, Leo II, and Reticulum II-which may point to distinct evolutionary pathways for these objects. However, the outer slope of the stellar density profile does not yet obviously correlate with other observed galaxy properties.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Dwarf spheroidal galaxies

Simbad objects: 45

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Number of rows : 45
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 Tuc IV G 00 02.9 -60 51           ~ 90 0
2 NAME Cetus II G 01 17.9 -17 25           ~ 56 0
3 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
4 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
5 NAME Eri III G 02 22 45.480 -52 17 04.92           ~ 79 0
6 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
7 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
8 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 76 0
9 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
10 NAME Reticulum III G 03 45.4 -60 27           ~ 67 0
11 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 177 1
12 NAME Pic I G 04 43 47.4 -50 16 59           ~ 58 0
13 NAME Col I G 05 31.4 -28 02           ~ 60 0
14 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
15 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
16 * alf Leo PM* 10 08 22.31099 +11 58 01.9516 0.88 1.24 1.40 1.37 1.47 B8IVn 891 1
17 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
18 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
19 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
20 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
21 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
22 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
23 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
24 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
25 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
26 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
27 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
28 NAME Bootes III G 13 57 07.4 +26 46 30     12.6     ~ 115 1
29 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
30 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
31 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
32 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
33 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
34 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
35 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 97 0
36 NAME Gru II G 22 04.1 -46 26           ~ 110 0
37 NAME Pegasus III LSB 22 24 22.6 +05 25 12           ~ 69 0
38 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
39 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
40 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
41 NAME Grus GrG 23 18 -42.4           ~ 42 0
42 NAME Tuc V G 23 37.4 -63 16           ~ 84 0
43 NAME Phe II G 23 39 59.4 -54 24 22           ~ 107 0
44 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
45 NAME Local Group GrG ~ ~           ~ 9325 0

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