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NuSTAR Discovery of a Cyclotron Line in the Be/X-ray Binary RX J0520.5-6932 During Outburst | | Shriharsh P. Tendulkar
; Felix Fürst
; Katja Pottschmidt
; Matteo Bachetti
; Varun B. Bhalerao
; Steven E. Boggs
; Finn E. Christensen
; William W. Craig
; Charles A. Hailey
; Fiona A. Harrison
; Daniel Stern
; John A. Tomsick
; Dominic J. Walton
; William Zhang
; | | Date: |
Wed, 17 Sep 2014 15:42:08 GMT (1867kb,D) | | Abstract: | We present spectral and timing analysis of NuSTAR observations of RX
J0520.5$-$6932 in the 3-79 keV band collected during its outburst in January
2014. The target was observed on two epochs and we report the detection of a
cyclotron resonant scattering feature with central energies of $E_mathrm{CRSF}
= 31.3_{-0.7}^{+0.8}$ keV and $31.5_{-0.6}^{+0.7}$ keV during the two
observations, respectively, corresponding to a magnetic field of $B approx 2
imes10^{12}$ G. The 3-79 keV luminosity of the system during the two epochs
assuming a nominal distance of 50 kpc was $3.667pm0.007 imes
10^{38},mathrm{erg,s^{-1}}$ and
$3.983pm0.007 imes10^{38},mathrm{erg,s^{-1}}$. Both values are much higher
than the critical luminosity of $approx1.5 imes10^{37},mathrm{erg,s^{-1}}$
above which a radiation dominated shock front may be expected. This adds a new
object to the sparse set of three systems that have a cyclotron line observed
at luminosities in excess of $10^{38},mathrm{erg,s^{-1}}$. A broad
($sigmaapprox0.45$ keV) Fe emission line is observed in the spectrum at a
central energy of $6.58_{-0.05}^{+0.05}$ keV in both epochs. The pulse profile
of the pulsar was observed to be highly asymmetric with a sharply rising and
slowly falling profile of the primary peak. We also observed minor variations
in the cyclotron line energy and width as a function of the rotation phase.% As
in observations of other cyclotron absorption line sources, there is a small
($Deltaphilesssim0.1$) phase difference between the peak of the cyclotron
energy variation and the peak of the flux variation. | | Source: | arXiv, 1409.5035 | | Services: | Forum | Review | PDF | Favorites | |
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