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Record 48 of 18067
INTEGRAL and XMM-Newton Observations of the X-Ray Pulsar IGR J16320-4751/AX J1691.9-4752
Author and Affiliation:
Rodriquez, J.(California Univ., San Diego, La Jolla, CA, United States)
Bodaghee, A.
Kaaret, P.
Tomsick, J. A.
Kuulkers, E.
Malaguti, G.
Petrucci, P.-O.
Cabanac, C.
Chernyakova, M.
Corbel, S. Show more authors
Abstract: We report on observations of the X-ray pulsar IGR J16320-4751 (also known as AX J1631.9-4752) performed simultaneously with International Gamma-Ray Astrophysics Laboratory (INTEGRAL) and XMM-Newton. We refine the source position and identify the most likely infrared counterpart. Our simultaneous coverage allows us to confirm the presence of X-ray pulsations at approximately 1300 s, that we detect above 20 keV with INTEGRAL for the first time. The pulse fraction is consistent with being constant with energy, which is compatible with a model of polar accretion by a pulsar. We study the spectral properties of IGR J16320-4751 during two major periods occurring during the simultaneous coverage with both satellites, namely a flare and a non-flare period. We detect the presence of a narrow 6.4 keV iron line in both periods. The presence of such a feature is typical of supergiant wind accretors such as Vela X-1 or GX 301-2. We inspect the spectral variations with respect to the pulse phase during the non-flare period, and show that the pulse is solely due to variations of the X-ray flux emitted by the source and not due to variations of the spectral parameters. Our results are therefore compatible with the source being a pulsar in a High Mass X-ray Binary. We detect a soft excess appearing in the spectra as a blackbody with a temperature of approximately 0.07 keV. We discuss the origin of the X-ray emission in IGR J16320-4751: while the hard X-rays are likely the result of Compton emission produced in the close vicinity of the pulsar, based on energy argument we suggest that the soft excess is likely the emission by a collisionally energized cloud in which the compact object is embedded.
Publication Date: Sep 14, 2006
Document ID:
(Acquired Nov 20, 2007)
Subject Category: ASTRONOMY
Document Type: Journal Article
Publication Information: Monthly Notices of the Royal Astronomical Society; p. 274-282; (ISSN 0035-8711); Volume 366
Contract/Grant/Task Num: NNG04GQ05G
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: California Univ., San Diego; Center for Astrophysics and Space Sciences; La Jolla, CA, United States
Description: 2p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
Availability Source: Other Sources
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