Supergiant fast X-ray transients with Swift: Spectroscopic and temporal properties

P. Romano, V. Mangano, L. Ducci, P. Esposito, R. Farinelli, C. Ceccobello, S. Vercellone, D. N. Burrows, J. A. Kennea, H. A. Krimm, N. Gehrels

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Supergiant fast X-ray transients (SFXTs) are a class of high-mass X-ray binaries with possible counterparts in the high energy gamma rays. The Swift SFXT Project1 has conducted a systematic investigation of the properties of SFTXs on timescales ranging from minutes to years and in several intensity states (from bright flares, to intermediate intensity states, and down to almost quiescence). We also performed broad-band spectroscopy of outbursts, and intensity-selected spectroscopy outside of outbursts. We demonstrated that while the brightest phase of the outburst only lasts a few hours, further activity is observed at lower fluxes for a remarkably longer time, up to weeks. Furthermore, we assessed the fraction of the time these sources spend in each phase, and their duty cycle of inactivity. We present the most recent results from our investigation. The spectroscopic and, most importantly, timing properties of SFXTs we have uncovered with Swift will serve as a guide in search for the high energy emission from these enigmatic objects.

Original languageEnglish (US)
Title of host publicationHigh Energy Gamma-Ray Astronomy - 5th International Meeting on High Energy Gamma-Ray Astronomy
Pages438-441
Number of pages4
DOIs
StatePublished - Dec 1 2012
Event5th International Meeting on High Energy Gamma-Ray Astronomy - Heidelberg, Germany
Duration: Jul 9 2012Jul 13 2012

Publication series

NameAIP Conference Proceedings
Volume1505
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other5th International Meeting on High Energy Gamma-Ray Astronomy
CountryGermany
CityHeidelberg
Period7/9/127/13/12

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Romano, P., Mangano, V., Ducci, L., Esposito, P., Farinelli, R., Ceccobello, C., Vercellone, S., Burrows, D. N., Kennea, J. A., Krimm, H. A., & Gehrels, N. (2012). Supergiant fast X-ray transients with Swift: Spectroscopic and temporal properties. In High Energy Gamma-Ray Astronomy - 5th International Meeting on High Energy Gamma-Ray Astronomy (pp. 438-441). (AIP Conference Proceedings; Vol. 1505). https://doi.org/10.1063/1.4772291