Investigating the Nature of IGR J17454-2919 Using X-Ray and Near-infrared Observations

Journal
Date Issued
2015
Author(s)
•
Nowak, M. A.
•
Rodriguez, J.
•
•
Chaty, S.
•
Rau, A.
•
Chenevez, J.
•
•
Greiner, J.
•
Schmidl, S.
DOI
Description
We thank the Chandra team for their rapid response in scheduling and delivering the observation. This work is partly based on observations with INTEGRAL , an ESA project with instruments and science data center funded by ESA member states, Czech Republic and Poland, and with the participation of Russia and the USA. This research has made use of the INTEGRAL sources page http://irfu.cea.fr/Sap/IGR-Sources/ . Part of the GROND funding (both hardware and personnel) was generously granted from the Leibniz-Prize to Prof. G. Hasinger, Deutsche Forschungsgemeinschaft (DFG) grant HA 1850/28-1. Sebastian Schmidl acknowledges support by the Thüringer Ministerium für Bildung, Wissenschaft und Kultur under FKZ 12010-514. This work is based on data products from observations made with ESO Telescopes at the La Silla or Paranal Observatories under ESO programme ID 179.B-2002. This publication makes use of data obtained as part of the UKIRT Infrared Deep Sky Survey and of data products from the 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. A.P. acknowledges the Italian Space Agency financial support INTEGRAL ASI/INAF agreement no. 2013-025.R.0. M.A.N. acknowledges support from NASA Grant G04-15027X. J.C. acknowledges financial support from ESA/PRODEX Nr. 90057. J.R. acknowledges funding support from the UnivEarthS Labex program of Sorbonne Paris Cité (ANR-10-LABX-0023 and ANR-11-IDEX-0005-02). A.P. thanks Lara Sidoli and Volker Beckmann for useful discussions. We thank the anonymous referee for the accurate reading of the manuscript.
Abstract
IGR J17454-2919 is a hard X-ray transient discovered by INTEGRAL on 2014 September 27. We report on our 20 ks Chandra observation of the source, performed about five weeks after the discovery, as well as on INTEGRAL and Swift long-term monitoring observations. X-ray broad-band spectra of the source are compatible with an absorbed power law, {{Γ }} ̃ 1.6-1.8, {N}H ̃ \(10-12) × {10}22 {{cm}}-2, with no trace of a cut-off in the data up to about 100 keV, and with an average absorbed 0.5-100 keV flux of about (7.1-9.7) × {10}-10 {erg} {{cm}}-2 {{{s}}}-1. With Chandra, we determine the most accurate X-ray position of IGR J17454-2919, {α }{{J}2000} = 17h45m27.ˢ69, {δ }{{J}2000} = -29°19\prime 53\buildrel{\prime\prime}\over{.} 8 (90% uncertainty of 0\buildrel{\prime\prime}\over{.} 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.
Volume
808
Issue
1
Start page
34
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2015ApJ...808...34P
Rights
open.access
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