2010A&A...513A..66E


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST21:44:40

2010A&A...513A..66E - Astronomy and Astrophysics, volume 513, A66-66 (2010/4-1)

Chandra detection of diffuse X-ray emission from the globular cluster Terzan 5.

EGER P., DOMAINKO W. and CLAPSON A.-C.

Abstract (from CDS):

Terzan 5, a globular cluster (GC) prominent in mass and population of compact objects, is searched for diffuse X-ray emission, as proposed by several models. We analyzed the data of an archival Chandra observation of Terzan 5 to search for extended diffuse X-ray emission outside the half-mass radius of the GC. We removed detected point sources from the data to extract spectra from diffuse regions around Terzan 5. The Galactic background emission was modeled by a 2-temperature thermal component, which is typical for Galactic diffuse emission. We detected significant diffuse excess emission above the particle background level from the whole field-of-view. The surface brightness appears to be peaked at the GC center and decreases smoothly outwards. After the subtraction of particle and Galactic background, the excess spectrum of the diffuse emission between the half-mass radius and 3' can be described by a power-law model with photon index Γ=0.9±0.5 and a surface flux of Fx=(1.17±0.16)x10–7erg/cm2/s/sr in the 1-7keV band. We estimated the contribution from unresolved point sources to the observed excess to be negligible. The observations suggest that a purely thermal origin of the emission is less likely than a non-thermal scenario. However, from simple modeling we cannot identify a clearly preferred scenario.

Abstract Copyright:

Journal keyword(s): globular clusters: individual: Terzan 5 - acceleration of particles - X-rays: diffuse background

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3548 0
2 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2997 0
3 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1207 1
4 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1771 0
5 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 694 1
6 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1217 0
7 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1807 0
8 NAME Galactic Ridge ? ~ ~           ~ 427 1

    Equat.    Gal    SGal    Ecl

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2020.07.14-21:44:40

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