Article (Scientific journals)
On the nature of the hard X-ray source IGR J2018+4043
Bykov, Andrei Mikhailovich; Krassilchtchikov, Alexandre Mikhailovich; Uvarov, Yuri Alexandrovich et al.
2006In Astrophysical Journal, 649 (1, Part 2), p. 21-L24
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Keywords :
ISM : individual (gamma Cygni); supernova remnants; X-rays : ISM
Abstract :
[en] We found a very likely counterpart to the recently discovered hard X-ray source IGR J2018 + 4043 in the multiwavelength observations of the source field. The source, originally discovered in the 20-40 keV band, is now confidently detected also in the 40-80 keV band, with a flux of (1.4 +/- 0.4) x 10(-11) ergs cm(-2) s(-1). A 5 ks Swift observation of the IGR J2018 + 4043 field revealed a hard pointlike source with an observed 0.5-10 keV flux of 3.4(-0.8)(+0.7) x 10(-12) ergs cm(-2) s(-1) (90% confidence level) at alpha = 20(h)18(m)38(s).55, delta = +40 degrees 41'00.4" (with a 4".2 uncertainty). The combined Swift-INTEGRAL spectrum can be described by an absorbed power-law model with photon index Gamma = 1.3 +/- 0.2 and N-H = 6.1(-2.2)(+3.3) x 10(22) cm(-2). In archival optical and infrared data we found a slightly extended and highly absorbed object at the Swift source position. There is also an extended VLA 1.4 GHz source peaked at a beamwidth distance from the optical and X-ray positions. The observed morphology and multiwavelength spectra of IGR J2018 + 4043 are consistent with those expected for an obscured accreting object, i.e., an AGN or a Galactic X-ray binary. The identification suggests possible connection of IGR J2018 + 4043 to the bright gamma-ray source GEV J2020 + 4023 detected by COS B and CGRO EGRET.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bykov, Andrei Mikhailovich;  Ioffe Institute of Physics and Technology (Russia)
Krassilchtchikov, Alexandre Mikhailovich;  Ioffe Institute of Physics and Technology (Russia)
Uvarov, Yuri Alexandrovich;  Ioffe Institute of Physics and Technology (Russia)
Kennea, J. A.
Pavlov, G. G.
Dubner, G. M.
Giacani, E. B.
Bloemen, H.
Hermsen, W.
Kaastra, J.
Lebrun, F.
Renaud, M.
Terrier, R.;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
De Becker, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Rauw, Grégor  ;  Université de Liège - ULiège > Département d'astrophys.
More authors (6 more) Less
Language :
English
Title :
On the nature of the hard X-ray source IGR J2018+4043
Publication date :
20 September 2006
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
Univ Chicago Press, Chicago, United States - Illinois
Volume :
649
Issue :
1, Part 2
Pages :
L21-L24
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 January 2009

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