ROSAT HRI observations of the globular clusters M13 and M92

Derek Brindley Fox, W. Lewin, B. Margon, J. Van Paradijs, F. Verbunt

Research output: Contribution to journalArticle

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Abstract

We report on 40 ks of ROSAT High Resolution Imager (HRI) observations of the globular cluster M92 (NGC 6341) and 20 ks of observations of the globular cluster M13 (NGC 6205). We find that the low-luminosity (1032.5 erg s-1 at 7.5 kpc) source previously observed near the core of M92 with the ROSAT Position Sensitive Proportional Counter (PSPC) remains unresolved at HRI resolution; we can identify it with M92 with 99 per cent confidence. In M13 we find that the source seen with the ROSAT PSPC lies within the core and is possibly associated with the cluster (96 per cent confidence). We find probabilities of 99.8 per cent (M92) and 98 per cent (M13) for the presence of additional unresolved emission within these globular clusters. We interpret these results in light of current theories regarding the low-luminosity sources.

Original languageEnglish (US)
Pages (from-to)1027-1032
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume282
Issue number3
DOIs
StatePublished - Jan 1 1996

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globular clusters
proportional counters
confidence
high resolution
luminosity
erg

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Fox, Derek Brindley ; Lewin, W. ; Margon, B. ; Van Paradijs, J. ; Verbunt, F. / ROSAT HRI observations of the globular clusters M13 and M92. In: Monthly Notices of the Royal Astronomical Society. 1996 ; Vol. 282, No. 3. pp. 1027-1032.
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ROSAT HRI observations of the globular clusters M13 and M92. / Fox, Derek Brindley; Lewin, W.; Margon, B.; Van Paradijs, J.; Verbunt, F.

In: Monthly Notices of the Royal Astronomical Society, Vol. 282, No. 3, 01.01.1996, p. 1027-1032.

Research output: Contribution to journalArticle

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T1 - ROSAT HRI observations of the globular clusters M13 and M92

AU - Fox, Derek Brindley

AU - Lewin, W.

AU - Margon, B.

AU - Van Paradijs, J.

AU - Verbunt, F.

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AB - We report on 40 ks of ROSAT High Resolution Imager (HRI) observations of the globular cluster M92 (NGC 6341) and 20 ks of observations of the globular cluster M13 (NGC 6205). We find that the low-luminosity (1032.5 erg s-1 at 7.5 kpc) source previously observed near the core of M92 with the ROSAT Position Sensitive Proportional Counter (PSPC) remains unresolved at HRI resolution; we can identify it with M92 with 99 per cent confidence. In M13 we find that the source seen with the ROSAT PSPC lies within the core and is possibly associated with the cluster (96 per cent confidence). We find probabilities of 99.8 per cent (M92) and 98 per cent (M13) for the presence of additional unresolved emission within these globular clusters. We interpret these results in light of current theories regarding the low-luminosity sources.

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