2001A&A...368..451S


Query : 2001A&A...368..451S

2001A&A...368..451S - Astronomy and Astrophysics, volume 368, 451-463 (2001/3-3)

BeppoSAX study of the broad-band properties of luminous globular cluster X-ray sources.

SIDOLI L., PARMAR A.N., OOSTERBROEK T., STELLA L., VERBUNT F., MASETTI N. and DAL FIUME D.

Abstract (from CDS):

We have performed a detailed study of the broadband spectra of the luminous (>1036erg/s) globular cluster X-ray sources using BeppoSAX. With the exception of X 2127+119, located in NGC 7078, all the other spectra are well represented by a two component model consisting of a disk-blackbody and Comptonized emission. The measured low-energy absorptions are in good agreement with those predicted from optical measurements of the host globular clusters. This implies that there is little intrinsic X-ray absorption within the binaries themselves, and that the above spectral model provides a good representation of the low-energy continua. The sources can be divided into two groups. In the first group, composed of 3 ultra-compact (orbital period <1hr) sources, the disk-blackbody temperatures and inner-radii appear physically realistic and the Comptonization seed photons temperatures and radii of the emission areas are consistent with the disk temperatures and inner radii. For all the other sources, the disk-blackbody parameters appear not to be physically realistic and the Comptonization parameters are unrelated to those of the disk-blackbody emission. If this is a spectral signature of ultra-compact binaries, this implies that no other ultra-compact binaries are present among those studied here. It is unclear why this difference between the two types of binaries should exist. One possibility may be related to the mass ratio, which is similar in the ultracompact systems and binaries containing black holes. In the latter systems the soft components are also well-fit with disk-blackbody models, which appear to have physically realistic parameters.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: neutron - globular clusters - X-rays: general

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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12678 1
2 4U 0513-40 LXB 05 14 06.59 -40 02 37.0           ~ 166 1
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1433 0
4 ESO 454-29 GlC 17 27 33.24 -30 48 07.8           ~ 254 0
5 4U 1722-30 LXB 17 27 33.25 -30 48 07.4     12.50     ~ 265 1
6 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5     15.50     ~ 824 1
7 Liller 1 Cl* 17 33 24.50 -33 23 20.0           ~ 267 0
8 NAME Rapid Burster LXB 17 33 24.61 -33 23 19.8           ~ 414 2
9 1RXS J173546.9-302859 LXB 17 35 46.88 -30 29 00.4           ~ 78 1
10 ESO 455-23 GlC 17 35 47.80 -30 28 11.0           ~ 257 0
11 X Sgr X-1 LXB 17 47 56.0 -26 33 49           ~ 375 0
12 [PLV2002] CX1 LXB 17 48 52.163 -20 21 32.40           ~ 195 1
13 NGC 6440 GlC 17 48 52.67 -20 21 34.5           ~ 554 0
14 4U 1746-371 LXB 17 50 12.66 -37 03 08.2     8.43     ~ 195 1
15 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 887 0
16 ESO 455-49 GlC 17 50 46.40 -31 16 31.0           ~ 187 0
17 Granat 1747-312 LXB 17 50 46.862 -31 16 28.86           ~ 118 1
18 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 888 1
19 V* MM Ser LXB 18 39 57.56 +05 02 09.6   19.2 19.2     ~ 349 0
20 NGC 6712 GlC 18 53 04.32 -08 42 21.5           ~ 520 0
21 4U 1850-086 LXB 18 53 04.89 -08 42 19.7 20.40 21.20 21.0     ~ 252 1
22 4U 2129+12 LXB 21 29 58.3124 +12 10 02.670 14.50 15.70 15.8     ~ 317 1
23 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3143 0

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