A 0535+26 in the August/September 2005 outburst observed by RXTE and INTEGRAL

dc.contributor.authorCaballero, I.
dc.contributor.authorKretschmar, P.
dc.contributor.authorSantangelo, A.
dc.contributor.authorStaubert, R.
dc.contributor.authorKlochkov, D.
dc.contributor.authorCamero, A.
dc.contributor.authorFerrigno, C.
dc.contributor.authorFinger, M. H.
dc.contributor.authorKreykenbohm, I.
dc.contributor.authorMcBride, V. A.
dc.contributor.authorPottschmidt, Katja
dc.contributor.authorRothschild, R. E.
dc.contributor.authorSchönherr, G.
dc.contributor.authorSegreto, A.
dc.contributor.authorSuchy, S.
dc.contributor.authorWilms, J.
dc.contributor.authorWilson, C. A.
dc.description.abstractAims. In this Letter we present results from INTEGRAL and RXTE observations of the spectral and timing behavior of the High Mass X-ray Binary A 0535+26 during its August/September 2005 normal (type I) outburst with an average flux  F₍₅₋₁₀₀₎ ₖₑᵥ ~ 400 mCrab. The search for cyclotron resonance scattering features (fundamental and harmonic) is one major focus of the paper. Methods. Our analysis is based on data from INTEGRAL and RXTE Target of Opportunity Observations performed during the outburst. The pulse period is determined. X-ray pulse profiles in different energy ranges are analyzed. The broad band INTEGRAL and RXTE pulse phase averaged X-ray spectra are studied. The evolution of the fundamental cyclotron line at different luminosities is analyzed. Results.The pulse period P is measured to be 103.39315(5) s at MJD 53614.5137. Two absorption features are detected in the phase averaged spectra at E₁ ~ 45 keV and E₂ ~ 100 keV. These can be interpreted as the fundamental cyclotron resonance scattering feature and its first harmonic and therefore the magnetic field can be estimated to be B ~4 × 10¹²  G.en_US
dc.description.sponsorshipWe wish to thank the INTEGRAL Mission Scientist, C. Winkler, and the ESA ISOC personnel for their patient help in scheduling the observations of this Target of Opportunity Program. We also thank the ASM/RXTE teams at MIT and at the RXTE SOF and GOF at NASA's GSFC. This research is supported by the Bundesministerium für Wirtschaft und Technologie through the German Space Agency (DLR) under contract no. 50 OR 0302. Based on observations with INTEGRAL, an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), Czech Republic and Poland, and with the participation of Russia and the USA.en_US
dc.format.extent4 pagesen_US
dc.genrejournal articlesen_US
dc.identifier.citationCaballero, I., P. Kretschmar, A. Santangelo, R. Staubert, D. Klochkov, A. Camero, C. Ferrigno, et al. “A 0535+26 in the August/September 2005 Outburst Observed by RXTE and INTEGRAL.” Astronomy & Astrophysics 465, no. 2 (April 1, 2007): L21–24. https://doi.org/10.1051/0004-6361:20067032.en_US
dc.publisherEDP Sciencesen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Physics Department
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.titleA 0535+26 in the August/September 2005 outburst observed by RXTE and INTEGRALen_US


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