A RADIATIVELY INEFFICIENT ACCRETION FLOW IN THE LINER 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.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'RESOLVE ' / Instrument name FILTER = 'FE55 ' / Filter name used OBS_ID = '300018010' / Observation identification string OBJECT = 'M81 ' / Object name OBSERVER= 'XRISM Collaboration' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 148.88825 / [deg] Object Right ascension DEC_OBJ = 69.06536 / [deg] Object Declination RA_PNT = 148.901486346652 / Pointing RA DEC_PNT = 69.0641381924711 / Pointing DEC RA_NOM = 148.89023034779 / [deg] Nominal aspect point R.A. DEC_NOM = 69.0648665379458 / [deg] Nominal aspect point Dec. PA_NOM = 286.836712693117 / [deg] Nominal aspect point roll. TELAPSE = 313081.43927899 / Elapsed time DATE-OBS= '2024-05-08T09:05:52.234375' / Start date DATE-END= '2024-05-12T00:03:53.673654' / Stop date ONTIME = 18518.725604 / On-source time EXPOSURE= 18518.725604 / Exposure time PROCVER = '03.00.013.009' / Processing script version MKFFF = 'ISAS/JAXA' / Origin of First FITS file ORIGIN = 'GSFC/NASA' / Origin of Processed FITS file SOFTVER = 'Hea_21Aug2024_V6.34_XRISM_21Aug2024_V001' / Version of HEADAS used CALDBVER= 'gen20240315_xtd20240815_rsl20240815' / Version of CALDB used DATE = '2024-09-26T15:35:45' / Date and time this file was created or updated SIB2_VER= / SIB2 version JAXA