2006A&A...447..199R

Query : 2006A&A...447..199R

2006A&A...447..199R - Astronomy and Astrophysics, volume 447, 199-203 (2006/2-3)

Chandra observations of the globular cluster M 54.

RAMSAY G. and WU K.

Abstract (from CDS):

We have carried out a Chandra observation of the globular cluster M 54. We detected 7 sources located within the half-mass radius of M 54, at a flux limit of 1.5x10–15erg/s/cm2 in the 0.3-8keV energy band. The spatial distribution and the colour/spectral properties of the 7 sources suggest that they are likely to be cataclysmic variables or LMXBs in the globular cluster. M 54 shows the largest number of X-ray sources with luminosities greater than 1032erg/s compared to other globular clusters observed using Chandra and XMM-Newton. We searched for a correlation between the number of sources above this luminosity level with globular cluster parameters. We found evidence that the number of sources peaks at a King concentration parameter c∼1.7-1.9, with globular clusters which are core-collapsed or have low-c values having a smaller number of sources. We speculate on possible reasons for this.

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Journal keyword(s): Galaxy: globular clusters: individual: M 54 - X-rays: binaries - stars: binaries: general - Galaxy: globular clusters: general

Nomenclature: Table 1: [RW2006] N (Nos 1-7).

Simbad objects: 23

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Number of rows : 23
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3914 0
2 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3425 0
3 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 715 0
4 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1848 0
5 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1975 0
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14407 0
7 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 845 1
8 NGC 6440 GlC 17 48 52.67 -20 21 34.5           ~ 550 0
9 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 768 0
10 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1377 0
11 [RW2006] 4 X 18 55 02.45 -30 28 57.5           ~ 2 0
12 [RW2006] 7 X 18 55 02.66 -30 28 41.5           ~ 1 0
13 [RW2006] 6 X 18 55 02.76 -30 28 53.0           ~ 2 0
14 [RW2006] 1 X 18 55 02.96 -30 28 45.0           ~ 3 0
15 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1067 0
16 [RW2006] 2 X 18 55 03.48 -30 28 47.4           ~ 3 0
17 [RW2006] 5 X 18 55 03.65 -30 28 41.1           ~ 2 0
18 [RW2006] 3 X 18 55 03.89 -30 28 38.0           ~ 2 0
19 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2186 2
20 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2000 0
21 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 427 0
22 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 354 0
23 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 321 0

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