SERPENS_X-1
Serpens X-1 is a persistently accreting neutron star (NS) with the first confirmed relativistically broadened Fe line for such systems. However, there remains conflicting reports of key parameters, such as the position of the inner accretion disk and inclination. These quantities can be determined from resolving the red- and blue-wings of the Fe line profile, which are most sensitive to the gravitational redshift and Doppler effects, respectively. Further, the Fe line has a unique double-peaked profile which can be due to high disk density effects causing the Fe XXV and XXVI lines to be produced at a similar strength. We request a 300 ks observation of the source to reveal the Doppler and relativistic effects that shape the line profile and further our understanding of the accretion flow.
obsid = 201073010 / Unique Observation/Sequence Number
object = SERPENS_X-1 / Object name
pi_name = LUDLAM RENEE / Proposal Principal Investigator Name
ra = 279.9903324117 / Right Ascension (Pointing Position) (deg)
dec = 5.03593618900277 / Declination (Pointing Position) (deg)
roll_angle = 257.948230445558 / Roll Angle (deg)
start_time = 2024-10-17T21:37:04 / Start Time of the Observation
stop_time = 2024-10-21T23:32:04 / Stop Time of the Observation
exposure = 172512.9375023 / Effective Total Observation Exposure (s)
public_date= 2025-10-31 / Public Date