2007MNRAS.376.1621M

Query : 2007MNRAS.376.1621M

2007MNRAS.376.1621M - Mon. Not. R. Astron. Soc., 376, 1621-1629 (2007/April-3)

Structural parameters of Mayall II = G1 in M31.

MA J., DE GRIJS R., CHEN D., VAN DEN BERGH S., FAN Z., WU Z., WU H., ZHOU X., WU J., JIANG Z. and CHEN J.

Abstract (from CDS):

Mayall II = G1 is one of the most luminous globular clusters (GCs) known in M31. New deep, high-resolution observations with the Advanced Camera for Surveys on the Hubble Space Telescope are used to provide accurate photometric data to the smallest radii yet. In particular, we present the precise variation of ellipticity and position angle, and of surface brightness for the core of the object. Based on these accurate photometric data, we redetermine the structural parameters of G1 by fitting a single-mass isotropic King model. We derive a core radius, rc= 0.21±0.01 arcsec (= 0.78 ±0.04 pc), a tidal radius, rt= 21.8±1.1 arcsec (= 80.7±3.9 pc), and a concentration index c = log (rt/rc) = 2.01 ±0.02. The central surface brightness is 13.510 mag/arcsec2. We also calculate the half-light radius, at rh= 1.73±0.07 arcsec (= 6.5 ±0.3 pc). The results show that, within 10 core radii, a King model fits the surface brightness distribution well. We find that this object falls in the same region of the MV versus log Rh diagram as ω Centauri, M54 and NGC 2419 in the Milky Way. All three of these objects have been claimed to be the stripped cores of now defunct dwarf galaxies. We discuss in detail whether GCs, stripped cores of dwarf spheroidals and normal dwarf galaxies form a continuous distribution in the MV versus log Rhplane, or if GCs and dwarf spheroidals constitute distinct classes of objects; we present arguments in favour of this latter view.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): globular clusters: individual: Mayall II = G1 - galaxies: evolution - galaxies: individual: M31

Simbad objects: 55

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Number of rows : 55
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 Bol 514 GlC 00 31 09.83 +37 54 00.0     16.28   14.68 ~ 43 0
2 NAME Mayall II GlC 00 32 46.5323801712 +39 34 40.504803060   14.564 13.807 13.208 12.684 ~ 400 1
3 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
4 NAME M31-EC3 GlC 00 38 04.61 +40 44 39.4     17.60   16.58 ~ 16 0
5 NAME M31-EC1 GlC 00 38 19.49 +41 47 14.9     17.60   16.72 ~ 16 0
6 Bol 37 GlC 00 41 34.9868411928 +41 14 55.086295416 19.891 18.749 16.849 15.428 14.190 ~ 65 0
7 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
8 NAME M31-EC2 GlC 00 42 55.00 +43 57 28.0     17.10   16.17 ~ 19 0
9 Bol 154 GlC 00 43 12.4500104280 +41 16 04.887403896 18.296 17.715 16.758 16.201 15.739 ~ 53 0
10 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
11 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 130 0
12 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
13 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
14 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
15 NAME M31-EC4 GlC 00 58 15.42 +38 03 02.0     18.84   17.77 ~ 27 0
16 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
17 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
18 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
19 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
20 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
21 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
22 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
23 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
24 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
25 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
26 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
27 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
28 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
29 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
30 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
31 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
32 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
33 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
34 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
35 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
36 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
37 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
38 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
39 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
40 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
41 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
42 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
43 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
44 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
45 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
46 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
47 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
48 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
49 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
50 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
51 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
52 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
53 NAME Galactic Bulge reg ~ ~           ~ 4794 0
54 [HLL2005] SC1 Cl* ~ ~           ~ 1 0
55 NAME Local Group GrG ~ ~           ~ 9325 0

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