Investigating the nature of IGR J17454-2919 using X-ray and Near-Infrared observations

Abstract

IGR J17454-2919 is a hard X-ray transient discovered by INTEGRAL on 2014 September 27. We report on our 20ks Chandra observation of the source, performed about five weeks after the discovery, as well as on INTEGRAL and Swift monitoring long-term observations. X-ray broad-band spectra of the source are compatible with an absorbed power-law, $\Gamma \sim$1.6-1.8, ${\mathrm{N}}_{\mathrm{H}}\sim$(10-12)$\times 10^{22}{\mathrm{cm}}^{-2}$, with no trace of a cut-off in the data up to about 100keV, and with an average absorbed 0.5-100keV flux of about (7.1-9.7)$\times 10^{-10}ergc{m}^{-2}{s}^{-1}$. With Chandra, we determine the most accurate X-ray position of IGR J17454-2919, ${\alpha }_{J2000}$=17${}^h$ 45${}^m$ 27${}^s$.69, ${\delta }_{J2000}$= $-$29${}^{\circ }$ 19${}^{\prime }$ 53${}^{\prime \prime }$.8 (90% uncertainty of 0${}^{\prime \prime }$.6), consistent with the NIR source 2MASS J17452768-2919534. We also include NIR investigations from our observations of the source field on 2014 October 6 with GROND. With the multi-wavelength information at hand, we discuss the possible nature of IGR J17454-2919.

9 pages, 4 figures, accepted for publication in ApJ

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• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• The WFCAM Science Archive
• The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS
• GROND - a 7-channel imager
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• The behavior of subluminous X-ray transients near the Galactic center as observed using the X-ray telescope aboard Swift
• Population of persistent high mass X-ray binaries in the Milky Way
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Cited by in corpus (4)

• BlackCAT: A catalogue of stellar-mass black holes in X-ray transients
• Probing the Interstellar Dust towards the Galactic Centre: Dust Scattering Halo around AX J1745.6-2901
• The INTEGRAL view on Black Hole X-ray Binaries
• Can Isolated Single Black Holes Produce X-ray Novae?