MRK279
Observations of extreme variability in the narrow Fe K-alpha emission line - independent of a moderately broad line component - demonstrate that multiple geometries can be explored in the Sy-1.5 AGN Mrk 279. This makes it an optimal target for XRISM Cycle 1. Variability in the narrow line component suggests a modest radius and extent, consistent with the optical broad line region. The "broad" Fe Ka component is not extreme and suggests a truncated inner disk and/or one with a warp. We request a 150 ks obs. of Mrk 279 in XRISM Cycle 1 to (1) precisely locate the Fe Ka emission components within the accretion flow, (2) compare the radii and geometries to optical line constraints, (3) test models of warped and/or truncated disks, (4) study ionized winds in emission.
obsid = 201083010 / Unique Observation/Sequence Number
object = MRK279 / Object name
pi_name = MILLER JON / Proposal Principal Investigator Name
ra = 208.265704473003 / Right Ascension (Pointing Position) (deg)
dec = 69.3083590364527 / Declination (Pointing Position) (deg)
roll_angle = 210.817867071641 / Roll Angle (deg)
start_time = 2024-09-19T19:58:04 / Start Time of the Observation
stop_time = 2024-09-23T09:09:04 / Stop Time of the Observation
exposure = 181110.40625072 / Effective Total Observation Exposure (s)
public_date= 2025-10-03 / Public Date