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          Institute: MPI für extraterrestrische Physik     Collection: High Energy Astrophysics at MPE     Display Documents

ID: 16512.0, MPI für extraterrestrische Physik / High Energy Astrophysics at MPE
Confirmation of two cyclotron lines in Vela X-1
Authors:Kreykenbohm, I.; Coburn, W.; Wilms, J.; Kretschmar, P.; Staubert, R.; Heindl, W. A.; Rothschild, R. E.
Date of Publication (YYYY-MM-DD):2002-11
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:1
Start Page:129
End Page:140
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present pulse phase-resolved X-ray spectra of the high mass X-ray binary Vela X-1 using the Rossi X-ray Timing Explorer. We observed Vela X-1 in 1998 and 2000 with a total observation time of similar to90 ksec. We find an absorption feature at 23.3(-0.06)(+1.3) keV in the main pulse, that we interpret as the fundamental cyclotron resonant scattering feature (CRSF). The feature is deepest in the rise of the main pulse where it has a width of 7.6(-2.2)(+4.4) keV and an optical depth of 0.33(-0.19)(+006). This CRSF is also clearly detected in the secondary pulse, but it is far less significant or undetected during the pulse minima. We conclude that the well known CRSF at 50.9(-0.7)(+0.6) keV, which is clearly visible even in phase-averaged spectra, is the first harmonic and not the fundamental. Thus we infer a magnetic field strength of B = 2.6 x 10(12) G.
Free Keywords:X-rays : stars; stars : magnetic fields; stars : pulsars : individual : Vela X-1
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Inst Astron & Astrophys Astron, Sand 1, D-72076 Tubingen,; Germany; Inst Astron & Astrophys Astron, D-72076 Tubingen, Germany; Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94702 USA; Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA; INTEGRAL, Sci Data Ctr, CH-1290 Versoix, Switzerland; Max Planck Inst Extraterr Phys, D-85740 Garching, Germany
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