论文信息 - Outburst of LS V+44 17 observed by MAXI and RXTE discovery of dip structure in pulse profile

Outburst of LS V+44 17 observed by MAXI and RXTE discovery of dip structure in pulse profile

We report the discovery of a dip structure in the pulse profile of Be/X-ray binary LS V +44 17 observed by RXTE during an outburst detected by MAXI. The outburst was first transient activity of LS V +44 17 since 1997 when the source was identified as a Be/X-ray binary. After the discovery with MAXI, the RXTE observations provided a pulse profile with a narrow dip structure in the soft X-ray band (3–10 keV). Our pulse-phase-resolved spectroscopy showed that the absorption column density at the dip phase is much higher than those at the other intervals. Thus we can conclude that the partial eclipse of the emission region by the accretion column of the neutron star causes the dip structure in the pulse profile of LS V +44 17 during the first outburst.

[1] Naoki Isobe,et al. The MAXI Mission on the ISS: Science and Instruments for Monitoring All-Sky X-Ray Images , 2009, 0906.0631.

[2] K. Wu,et al. Accretion column eclipses in the X-ray pulsars GX 1+4 and RX J0812.4−3114 , 2000, astro-ph/0010523.

[3] P. Reig,et al. Discovery of two new persistent Be/X‐ray pulsar systems , 1999, astro-ph/9902221.

[4] E. Janot-Pacheco,et al. New massive x-ray binary candidates from the rosat galactic plane survey I - results from a cross-correlation with ob star catalogues , 1996, astro-ph/9611122.