J/A+A/309/116 10 globular cluster ROSAT observations (Johnston+, 1996)
ROSAT observations of ten globular clusters with large core radii
Johnston H.M., Verbunt F., Hasinger G.
<Astron. Astrophys. 309, 116 (1996)>
=1996A&A...309..116J 1996A&A...309..116J
ADC_Keywords: Clusters, globular ; X-ray sources
Mission_Name: ROSAT
Keywords: globular clusters: general - X-rays: stars
Description:
We present X-ray observations of ten globular clusters observed with
the ROSAT PSPC. The clusters were chosen to have large core radii
and to be nearby. Three clusters contain X-ray sources which are
probably associated with the cluster. One is the previously
discovered X-ray transient H1825-331 in NGC 6652. The other two, in
NGC 6366 and NGC 6809, are new members of the class of
low-luminosity sources, with luminosities in the region of
1032erg/s. Upper limits can be placed on the source temperatures of
both sources, making them similar to sources found in other globular
clusters by ROSAT.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 104 115 Detected sources
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Name Source name (1)
4- 10 A7 --- Cluster Cluster name
13- 14 I2 h RAh Right ascension J2000 (hours)
16- 17 I2 min RAm Right ascension J2000 (minutes)
19- 22 F4.1 s RAs Right ascension J2000 (seconds)
25 A1 --- DE- Declination J2000 sign
26- 27 I2 deg DEd Declination J2000 (degrees)
29- 30 I2 arcmin DEm Declination J2000 (minutes)
32- 33 I2 arcsec DEs Declination J2000 (seconds)
35- 39 F5.1 --- Delta [0,] Offset from core (core radii)
41- 46 I6 ct Cts Counts (2)
48- 49 I2 ct e_Cts ? Error on counts
51- 58 F8.2 10-24W/m2 S 0.5-2.5 keV X-ray flux
61 A1 --- l_HR1 Limit flag on HR1
62- 66 F5.2 --- HR1 []? Hardness ratio 1
68- 71 F4.2 --- e_HR1 []? Error on HR1
74 A1 --- l_HR2 Limit flag on HR2
75- 79 F5.2 --- HR2 []? Hardness ratio 2
81- 84 F4.2 --- e_HR2 []? Error on HR2
88- 99 A12 --- ID Optical ID (3)
101-104 F4.1 arcsec Offset ? Offset between X-ray & optical
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Note (1): "C" represents the upper limit to the number of counts at
the cluster core, for clusters where no source was detected
in the core.
Note (2): Counts <0 indicate an upper limit
Note (3): A source was taken to be a counterpart when the difference in
position was less than about 15 arcsec.
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Courtesy: H.M. Johnston,
History: For object No. 4, the right identification, HD89493 instead of HD89483,
was corrected on 23-Jul-2001
(End) Patricia Bauer [CDS] 12-Jan-1996