M81
Up to 40% of all galaxies may harbor low-ionization nuclear emission region (LINERs) and low-luminosity AGN (LLAGN). Well-developed theory suggests that the inner flow should be advective and radiatively inefficient, with a standard thin disk truncated far from the black hole. Resolve spectroscopy of M81* offers the best chance to finally reveal the geometry and dynamics of a radiatively inefficient accretion flow (RIAF) onto a black hole. M81* is the brightest LINER /LLAGN in X-rays. Prior Chandra/HETG spectra reveal low-ionization and He-like and H-like Fe K emission lines that are likely redshifted. A 100 ks exposure with Resolve can make unique tests of RIAF models.
obsid = 300018010 / Unique Observation/Sequence Number
object = M81 / Object name
pi_name = Collaboration XRISM / Proposal Principal Investigator Name
ra = 148.89023034779 / Right Ascension (Pointing Position) (deg)
dec = 69.0648665379458 / Declination (Pointing Position) (deg)
roll_angle = 286.836712693117 / Roll Angle (deg)
start_time = 2024-05-08T08:43:04 / Start Time of the Observation
stop_time = 2024-05-12T00:05:04 / Stop Time of the Observation
exposure = 268779.3924081 / Effective Total Observation Exposure (s)
public_date= 2025-08-31 / Public Date