Two rapidly variable galactic x-ray transients observed with chandra, XMM-Newton, and Suzaku

C. O. Heinke, J. A. Tomsick, F. Yusef-Zadeh, J. E. Grindlay

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We have identified two moderately bright, rapidly variable transients in new and archival X-ray data near the Galactic center. Both objects show strong, flaring variability on timescales of tens to thousands of seconds, evidence of NH variability, and hard spectra. XMMU J174445.5-295044 is seen at 2-10 keV fluxes of 3 × 10-11 to <10-12 erg cm-2 s-1, with NH at or above 5 × 10 22 cm-2, by XMM-Newton, Chandra, and Suzaku. A likely Two Micron All Sky Survey (2MASS) counterpart with KS = 10.2 shows colors indicative of a late-type star. CXOU J174042.0-280724 is a likely counterpart to the fast hard transient IGR J17407-2808. Chandra observations find F X (2-10 keV) 10-12 erg cm-2 s-1, with large NH variations (from 2 × 1022 to >2 × 1023 cm-2). No 2MASS counterpart is visible, to KS >13. XMMU J174445.5-295044 seems likely to be a new symbiotic star or symbiotic X-ray binary, while CXOU J174042.0-280724 is more mysterious, likely an unusual low-mass X-ray binary.

Original languageEnglish (US)
Pages (from-to)1627-1635
Number of pages9
JournalAstrophysical Journal
Volume701
Issue number2
DOIs
StatePublished - 2009

Keywords

  • Stars: neutron
  • X-rays: binaries

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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