2022ApJ...938..101S

Query : 2022ApJ...938..101S

2022ApJ...938..101S - Astrophys. J., 938, 101 (2022/October-3)

The Hubble Space Telescope Survey of M31 Satellite Galaxies. I. RR Lyrae-based Distances and Refined 3D Geometric Structure.

SAVINO A., WEISZ D.R., SKILLMAN E.D., DOLPHIN A., KALLIVAYALIL N., WETZEL A., ANDERSON J., BESLA G., BOYLAN-KOLCHIN M., BULLOCK J.S., COLE A.A., COLLINS M.L.M., COOPER M.C., DEASON A.J., DOTTER A.L., FARDAL M., FERGUSON A.M.N., FRITZ T.K., GEHA M.C., GILBERT K.M., GUHATHAKURTA P., IBATA R., IRWIN M.J., JEON M., KIRBY E., LEWIS G.F., MACKEY D., MAJEWSKI S.R., MARTIN N., McCONNACHIE A., PATEL E., RICH R.M., SIMON J.D., SOHN S.T., TOLLERUD E.J. and VAN DER MAREL R.P.

Abstract (from CDS):

We measure homogeneous distances to M31 and 38 associated stellar systems (-16.8 ≤ MV ≤ -6.0), using time-series observations of RR Lyrae stars taken as part of the Hubble Space Telescope Treasury Survey of M31 Satellites. From >700 orbits of new/archival Advanced Camera for Surveys imaging, we identify >4700 RR Lyrae stars and determine their periods and mean magnitudes to a typical precision of 0.01 day and 0.04 mag. Based on period-Wesenheit-metallicity relationships consistent with the Gaia eDR3 distance scale, we uniformly measure heliocentric and M31-centric distances to a typical precision of ∼20 kpc (3%) and ∼10 kpc (8%), respectively. We revise the 3D structure of the M31 galactic ecosystem and: (i) confirm a highly anisotropic spatial distribution such that ∼80% of M31's satellites reside on the near side of M31; this feature is not easily explained by observational effects; (ii) affirm the thin (rms 7-23 kpc) planar “arc” of satellites that comprises roughly half (15) of the galaxies within 300 kpc from M31; (iii) reassess the physical proximity of notable associations such as the NGC 147/185 pair and M33/AND XXII; and (iv) illustrate challenges in tip-of-the-red-giant branch distances for galaxies with MV > - 9.5, which can be biased by up to 35%. We emphasize the importance of RR Lyrae for accurate distances to faint galaxies that should be discovered by upcoming facilities (e.g., Rubin Observatory). We provide updated luminosities and sizes for our sample. Our distances will serve as the basis for future investigation of the star formation and orbital histories of the entire known M31 satellite system.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Andromeda Galaxy - RR Lyrae variable stars - Distance measure - Dwarf galaxies

Simbad objects: 47

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Number of rows : 47
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 Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
2 NAME Andromeda XX G 00 07 30.70 +35 07 56.4     18.2     ~ 77 0
3 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 168 0
4 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
5 NAME Andromeda XXVI G 00 23 45.6 +47 54 58     17.3     ~ 76 0
6 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
7 NAME Andromeda XXV G 00 30 08.9 +46 51 07     14.8     ~ 120 0
8 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
9 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
10 NAME Cassiopeia III G 00 35 59.4 +51 33 35           ~ 59 0
11 NAME Andromeda XXX G 00 36 34.90 +49 38 48.0           ~ 59 0
12 NAME Andromeda XVII G 00 37 07.0 +44 19 20     15.8     ~ 101 0
13 NAME Andromeda XXVII G 00 37 27.1 +45 23 13     16.7     ~ 82 0
14 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
15 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
16 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
17 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
18 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
19 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 130 0
20 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
21 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
22 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
23 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
24 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
25 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
26 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
27 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
28 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
29 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 123 0
30 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
31 NAME Andromeda XXIV G 01 18 30.0 +46 21 58     16.3     ~ 64 0
32 NAME Andromeda XXII G 01 27 40.0 +28 05 25     18.0     ~ 95 0
33 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 88 0
34 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
35 NAME Andromeda XXXIII G 03 01 23.6 +40 59 18           ~ 43 0
36 M 38 OpC 05 28 40.0 +35 49 08   6.69 6.4     ~ 184 2
37 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
38 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
39 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
40 NAME Lacerta I G 22 58 16.3 +41 17 28           ~ 53 0
41 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
42 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
43 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
44 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 117 0
45 NAME Andromeda XXIX G 23 58 55.6 +30 45 20     16.0     ~ 61 0
46 NAME Local Group GrG ~ ~           ~ 9325 0
47 NAME Andromeda Stream St* ~ ~           ~ 77 1

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