2007ApJ...660.1246S


Query : 2007ApJ...660.1246S

2007ApJ...660.1246S - Astrophys. J., 660, 1246-1263 (2007/May-2)

The low-mass X-ray binary and globular cluster connection in Virgo cluster early-type galaxies: optical properties.

SIVAKOFF G.R., JORDAN A., SARAZIN C.L., BLAKESLEE J.P., COTE P., FERRARESE L., JUETT A.M., MEI S. and PENG E.W.

Abstract (from CDS):

LMXBs form efficiently in GCs. By combining Chandra and HST ACS observations of 11 massive early-type galaxies in the Virgo Cluster, we use the most accurate identification of LMXBs and GCs to date to explore the optical properties of 270 GCs with LMXBs and 6488 GCs without detectable X-ray emission. More massive, redder, and more compact GCs are more likely to contain LMXBs. Unlike Galactic GCs, a large number of GCs with LMXBs have half-mass relaxation times >2.5 Gyr; GCs need not survive for more than five relaxation timescales to produce LMXBs. By fitting the dependence of the expected number of LMXBs per GC, λt, on the GC mass M, color (g-z), and half-mass radius rh,cor, we find that λt∝M1.24±0.08x100.9+0.2-0.1(g–z)r–2.2±0.2h,cor. This rules out that the number of LMXBs per GC is linearly proportional to GC mass (99.89% confidence limit) and leads us to predict that most GCs with high X-ray luminosities contain a single LMXB. The detailed dependence of λt on GC properties appears mainly due to a dependence on the encounter rate Γh and the metallicity Z, λt∝Γ0.82±0.05hZ0.39±0.07. Our analysis provides strong evidence that dynamical formation and metallicity play the primary roles in determining the presence of an LMXB in extragalactic GCs. The shallower than linear encounter rate dependence requires an explanation by theories of dynamical binary formation. A metallicity-dependent variation in the number of neutron stars and black holes per unit GC mass, effects from irradiation-induced winds, or suppression of magnetic braking in metal-poor stars may all be consistent with our abundance dependence; all three scenarios require further development.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Close - Galaxies: Elliptical and Lenticular, cD - Galaxies: Star Clusters - Galaxy: Globular Clusters: General - X-Rays: Binaries - X-Rays: Galaxies

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11440 1
2 NGC 1023 IG 02 40 24.012 +39 03 47.70 10.91 10.35 9.35 7.83   ~ 618 2
3 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1400 0
4 NGC 4278 LIN 12 20 06.8253868 +29 16 50.713486 11.54 11.09 10.16     ~ 903 2
5 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 809 0
6 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1675 2
7 M 85 GiP 12 25 24.053 +18 11 27.89   10.2       ~ 613 0
8 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1026 1
9 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6084 0
10 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1994 2
11 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6474 3
12 NGC 4526 GiG 12 34 03.029 +07 41 56.90   10.6       ~ 619 1
13 M 89 LIN 12 35 39.8073444 +12 33 22.830809 11.29 10.73 9.75     ~ 943 2
14 M 59 GiG 12 42 02.322 +11 38 48.95   11.0       ~ 667 0
15 M 60 GiP 12 43 40.008 +11 33 09.40   10.3       ~ 1278 0
16 NGC 4697 GiG 12 48 35.8992791099 -05 48 02.497675635   10.97   9.83   ~ 818 0
17 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4119 3
18 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2973 0

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2021.09.19-06:14:16

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