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The Nature of the X-Ray Binary IGR J19294+1816 from INTEGRAL, RXTE, and Swift ObservationsWe report the results of a high-energy multi-instrumental campaign with INTEGRAL, RXTE, and Swift of the recently discovered INTEGRAL source IGR J19294+ 1816. The Swift/XRT data allow us to refine the position of the source to R.A. (J2000) = 19h 29m 55.9s, Decl. (J2000) = +18 deg 18 feet 38 inches . 4 (+/- 3 inches .5), which in turn permits us to identify a candidate infrared counterpart. The Swift and RXTE spectra are well fitted with absorbed power laws with hard (Gamma approx 1) photon indices. During the longest Swift observation, we obtained evidence of absorption in true excess to the Galactic value, which may indicate some intrinsic absorption in this source. We detected a strong (P = 40%) pulsations at 12.43781 (+/- 0.00003) s that we interpret as the spin period of a pulsar. All these results, coupled with the possible 117 day orbital period, point to IGR J19294+ 1816 being an high-mass X-ray binary (HMXB) with a Be companion star. However, while the long-term INTEGRAL/IBIS/ISGRI 18-40 keV light curve shows that the source spends most of its time in an undetectable state, we detect occurrences of short (2000-3000 s) and intense flares that are more typical of supergiant fast X-ray transients. We therefore cannot make firm conclusions on the type of system, and we discuss the possible implication of IGR J19294+1816 being an Supergiant Fast X-ray Transient (SFXT).
Document ID
20120002782
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Rodriquez, J.
(Commissariat a l'Energie Atomique Gif-sur-Yvette, France)
Tomsick, J. A.
(California Univ. Berkeley, CA, United States)
Bodaghee, A.
(California Univ. Berkeley, CA, United States)
ZuritaHeras, J.-A.
(Commissariat a l'Energie Atomique Gif-sur-Yvette, France)
Chaty, S.
(Commissariat a l'Energie Atomique Gif-sur-Yvette, France)
Paizis, A.
(Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Milan, Italy)
Corbel, S.
(Commissariat a l'Energie Atomique Gif-sur-Yvette, France)
Date Acquired
August 25, 2013
Publication Date
December 1, 2009
Publication Information
Publication: Astronomy and Astrophysics
Volume: er 2
Issue: 2
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Other

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