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http://hdl.handle.net/20.500.12386/25870
Titolo: | Multi-wavelength observations of IGR J17544-2619 from quiescence to outburst | Autori: | Bozzo, E. Bhalerao, V. Pradhan, P. Tomsick, J. ROMANO, Patrizia Ferrigno, C. Chaty, S. Oskinova, L. Manousakis, A. Walter, R. Falanga, M. CAMPANA, Sergio Stella, L. Ramolla, M. Chini, R. |
Data pubblicazione: | 2016 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 596 | Da pagina:: | A16 | Abstract: | In this paper we report on a long multi-wavelength observational campaign of the supergiant fast X-ray transient prototype IGR J17544-2619. A 150 ks-long observation was carried out simultaneously with XMM-Newton and NuSTAR, catching the source in an initial faint X-ray state and then undergoing a bright X-ray outburst lasting approximately 7 ks. We studied the spectral variability during outburst and quiescence by using a thermal and bulk Comptonization model that is typically adopted to describe the X-ray spectral energy distribution of young pulsars in high mass X-ray binaries. Although the statistics of the collected X-ray data were relatively high, we could neither confirm the presence of a cyclotron line in the broad-band spectrum of the source (0.5-40 keV), nor detect any of the previously reported tentative detections of the source spin period. The monitoring carried out with Swift /XRT during the same orbit of the system observed by XMM-Newton and NuSTAR revealed that the source remained in a low emission state for most of the time, in agreement with the known property of all supergiant fast X-ray transients being significantly sub-luminous compared to other supergiant X-ray binaries. Optical and infrared observations were carried out for a total of a few thousand seconds during the quiescence state of the source detected by XMM-Newton and NuSTAR. The measured optical and infrared magnitudes were slightly lower than previous values reported in the literature, but compatible with the known micro-variability of supergiant stars. UV observations obtained with the UVOT telescope on-board Swift did not reveal significant changes in the magnitude of the source in this energy domain compared to previously reported values. | URI: | http://hdl.handle.net/20.500.12386/25870 | URL: | https://www.aanda.org/articles/aa/abs/2016/12/aa29311-16/aa29311-16.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201629311 | Bibcode ADS: | 2016A&A...596A..16B | Fulltext: | open |
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