Speaker
Description
MAXI J1421-613 is an X-ray burster discovered by MAXI on 9 January 2014 and is considered to be a low-mass X-ray binary. We report the discovery of an annular emission around MAXI J1421-613 in Suzaku and Swift follow-up observations. The Swift follow-up observation which was conducted by the photon counting mode on 18 January 2014 found an annular emission at ?2.5'--4.5' whereas the Suzaku observation on 31 January to 3 February 2014 detected an annular emission of 3'--9' radius around the transient source. The spectra of the annular emission were represented by an absorbed power law, and the photon index was higher than that of MAXI J1421–613 itself by delta Gamma ~ 2. The flux and radius of the annular emission observed by Suzaku and Swift are well explained by dust scattering of the same outburst of the transient. We estimate the distance to MAXI J1421-613 to be ~3 kpc assuming that the dust layer is at the same location as the CO cloud in front of MAXI J1421-613.
