4U1627-67
4U 1626-67 is a low-mass X-ray binary pulsar (LMXBP) with a rotation period of P_spin = 7.7 s. Since its discovery, many X-ray instruments have observed 4U 1626-67, and the detection of the Fe emission line has been reported. However, the origin of the Fe line is still uncertain. For the emission region, two possibilities will be suggested: the inner edge of the accretion disk at the Alfven radius and further inner accretion flow onto the magnetic pole of the neutron star (NS). We aim to resolve the emission region of the Fe line with XRISM. Furthermore, we perform a phase-resolved spectroscopy for the Fe line. Due to the short spin period, the high-resolution phase-resolved spectroscopy can be carried out only with XRISM.
obsid = 202081010 / Unique Observation/Sequence Number
object = 4U1627-67 / Object name
pi_name = YONEYAMA TOMOKAGE / Proposal Principal Investigator Name
ra = 248.068300739157 / Right Ascension (Pointing Position) (deg)
dec = -67.4605547347096 / Declination (Pointing Position) (deg)
roll_angle = 123.756747483331 / Roll Angle (deg)
start_time = 2026-04-06T22:46:04 / Start Time of the Observation
stop_time = 2026-04-08T01:01:04 / Stop Time of the Observation
exposure = 49191.037493 / Effective Total Observation Exposure (s)
public_date= 2027-04-30 / Public Date