Recent Torque Reversal of 4U 1907+09

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dc.creatorInam, S. C.
dc.creatorSahiner, S.
dc.creatorBaykal, A.
dc.date2008-12-22
dc.date2009-05-15
dc.date.accessioned2026-07-07T13:14:48Z
dc.date.available2026-07-07T13:14:48Z
dc.descriptionWe present timing and spectral analysis of RXTE-PCA observations of the accretion powered pulsar 4U 1907+09 between June 2007 and August 2008. 4U 1907+09 had been in a spin-down episode with a spin-down rate of $-3.54\times10^{-14}$ Hz s$^{-1}$ before 1999. From RXTE observations after March 2001, the source showed a $\sim 60$% decrease in spin-down magnitude and INTEGRAL observations after March 2003 showed that source started to spin-up. We found that the source recently entered a new spin-down episode with a spin-down rate of $-3.59 \times 10^{-14}$ Hz s$^{-1}$. This spin-down rate is pretty close to the previous long term spin-down rate of the source measured before 1999. From the spectral analysis, we showed that Hydrogen column density varies with the orbital phase.
dc.descriptionPublished in MNRAS
dc.identifierhttps://arxiv.org/abs/0812.4189
dc.identifierhttp://arxiv.org/abs/0812.4189
dc.identifier2009MNRAS.395.1015I
dc.identifierdoi:10.1111/j.1365-2966.2009.14596.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230290
dc.subjectAstrophysics
dc.titleRecent Torque Reversal of 4U 1907+09
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