Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-06-25
Astrophys.J.701:1627-1635,2009
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
9 pages, 13 figures (5 color), ApJ in press
Scientific paper
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 N_H variability, and hard spectra. XMMU J174445.5-295044 is seen at 2-10 keV fluxes of 3*10^{-11} to <10^{-12} ergs/cm^2/s, with N_H at or above 5*10^22 cm^{-2}, by XMM, Chandra, and Suzaku. A likely 2MASS counterpart with K_S=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} ergs/cm^{-2}/s, with large N_H variations (from 2*10^22 to >2*10^23 cm^{-2}). No 2MASS counterpart is visible, to K_S>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.
Grindlay Jonathon E.
Heinke Craig O.
Tomsick John A.
Yusef-Zadeh Farah
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