2013ApJ...772...15M

Query : 2013ApJ...772...15M

2013ApJ...772...15M - Astrophys. J., 772, 15 (2013/July-3)

Lacerta I and Cassiopeia III. Two luminous and distant Andromeda satellite dwarf galaxies found in the 3π Pan-STARRS1 survey.

MARTIN N.F., SLATER C.T., SCHLAFLY E.F., MORGANSON E., RIX H.-W., BELL E.F., LAEVENS B.P.M., BERNARD E.J., FERGUSON A.M.N., FINKBEINER D.P., BURGETT W.S., CHAMBERS K.C., HODAPP K.W., KAISER N., KUDRITZKI R.-P., MAGNIER E.A., MORGAN J.S., PRICE P.A., TONRY J.L. and WAINSCOAT R.J.

Abstract (from CDS):

We report the discovery of two new dwarf galaxies, Lacerta I/Andromeda XXXI (Lac I/And XXXI) and Cassiopeia III/Andromeda XXXII (Cas III/And XXXII), in stacked Pan-STARRS1 rP1- and iP1-band imaging data. Both are luminous systems (MV∼ -12) located at projected distances of 20.°3 and 10.°5 from M31. Lac I and Cas III are likely satellites of the Andromeda galaxy with heliocentric distances of 756–28+44 kpc and 772–5661, respectively, and corresponding M31-centric distances of 275±7 kpc and 1444_+6. The brightest of recent Local Group member discoveries, these two new dwarf galaxies owe their late discovery to their large sizes (rh = 4.2–0.5+0.4 arcmin or 912–93+124 pc for Lac I; rh = 6.5–1.0+1.2 arcmin or 1456±267 pc for Cas III) and consequently low surface brightness (µ0∼ 26.0 mag/arcsec2), as well as to the lack of a systematic survey of regions at large radii from M31, close to the Galactic plane. This latter limitation is now alleviated by the 3π Pan-STARRS1 survey, which could lead to the discovery of other distant Andromeda satellite dwarf galaxies.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual (Andromeda XXXI, Andromeda XXXII, Cassiopeia III, Lacerta I) - Local Group

Nomenclature: And R (Nos XXXI-XXXII) added = NAME Andromeda R (Nos XXXI-XXXII) added. NAME Lacerta I N=1. NAME Cassiopeia III N=1.

Simbad objects: 16

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Number of rows : 16
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 III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
2 NAME Cassiopeia III G 00 35 59.4 +51 33 35           ~ 59 0
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
5 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
6 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
7 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
8 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
9 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
10 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
11 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
12 NAME Lacerta I G 22 58 16.3 +41 17 28           ~ 53 0
13 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
14 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
15 NAME Andromeda XXIX G 23 58 55.6 +30 45 20     16.0     ~ 61 0
16 NAME Local Group GrG ~ ~           ~ 9325 0

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