Artículo
Abstract:
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) × 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 × 10-12 ergs cm-2 s-1 (90% confidence level) at α = 20 h18m38.s55, δ = +40°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 Γ = 1.3 ± 0.2 and NH = 6.1-2.2+3.2 × 1022 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 γ-ray source GEV J2020+4023 detected by COS B and CGRO EGRET. © 2006. The American Astronomical Society. All rights reserved.
Registro:
| Documento: | Artículo |
| Título: | On the nature of the hard X-ray source IGR J2018+4043 |
| Autor: | Bykov, A.M.; Krassilchtchikov, A.M.; Uvarov, Yu.A.; Kennea, J.A.; Pavlov, G.G.; Dubner, G.M.; Giacani, E.B.; Bloemen, H.; Hermsen, W.; Kaastra, J.; Lebrun, F.; Renaud, M.; Terrier, R.; Debecker, M.; Rauw, G.; Swings, J.-P. |
| Filiación: | A. F. Ioffe Institute of Physics and Technology, Russian Academy of Sciences, 26 Polytekhnicheskaya, St. Petersburg 194021, Russian Federation Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, United States Instituto de Astronomía y Física del Espacio (IAFE), Casilla de Correos 67, Succursale 28, 1428 Buenos Aires, Argentina SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, Netherlands Astronomical Institute Anton Pannekoek, University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, Netherlands CEA-Saclay, DSM/DAPNIA/Service d'Astrophysique, 91191 Gif-sur-Yvette Cedex, France APC-UMR 7164, 11 Place M. Berthelot, 75231 Paris, France Institut d'Astrophysique et de Géophysique, Université de Liège, Bat B5c, Allee du 6 Aout 17, 4000 Liège, Belgium |
| Palabras clave: | ISM: Individual (γ Cygni); Supernova remnants; X-rays: ISM |
| Año: | 2006 |
| Volumen: | 649 |
| Número: | 1 II |
| Página de inicio: | L21 |
| Página de fin: | L24 |
| DOI: | http://dx.doi.org/10.1086/508327 |
| Título revista: | Astrophysical Journal |
| Título revista abreviado: | Astrophys. J. |
| ISSN: | 0004637X |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v649_n1II_pL21_Bykov |
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Citas:
---------- APA ----------
Bykov, A.M., Krassilchtchikov, A.M., Uvarov, Yu.A., Kennea, J.A., Pavlov, G.G., Dubner, G.M., Giacani, E.B.,..., Swings, J.-P. (2006) . On the nature of the hard X-ray source IGR J2018+4043. Astrophysical Journal, 649(1 II), L21-L24.http://dx.doi.org/10.1086/508327
---------- CHICAGO ----------
Bykov, A.M., Krassilchtchikov, A.M., Uvarov, Yu.A., Kennea, J.A., Pavlov, G.G., Dubner, G.M., et al. "On the nature of the hard X-ray source IGR J2018+4043" . Astrophysical Journal 649, no. 1 II (2006) : L21-L24.http://dx.doi.org/10.1086/508327
---------- MLA ----------
Bykov, A.M., Krassilchtchikov, A.M., Uvarov, Yu.A., Kennea, J.A., Pavlov, G.G., Dubner, G.M., et al. "On the nature of the hard X-ray source IGR J2018+4043" . Astrophysical Journal, vol. 649, no. 1 II, 2006, pp. L21-L24.http://dx.doi.org/10.1086/508327
---------- VANCOUVER ----------
Bykov, A.M., Krassilchtchikov, A.M., Uvarov, Yu.A., Kennea, J.A., Pavlov, G.G., Dubner, G.M., et al. On the nature of the hard X-ray source IGR J2018+4043. Astrophys. J. 2006;649(1 II):L21-L24.http://dx.doi.org/10.1086/508327
