FAIRALL9
We propose a 150ks snapshot of Fairall 9 with XRISM during our 34 orbit HST spectroscopic monitoring campaign (April-September 2026) to explore the structure of the BLR. A recent intensive monitoring campaign has given a unique insight into the structure of the inner flow. The missing piece is how the BLR structure links to this inner flow. HST gives the optical/UV spectra, allowing for a decomposition of the disc and BLR emission. But the optical/UV line-shapes are highly sensitive to radiative transfer effects, so not suitable for determining the BLR structure. The X-ray Fe-Ka line is a much more robust tracer of column-density. XRISM is uniquely able to resolve this line-shape, allowing us to model the BLR structure, giving a unique window into the link between the central flow and BLR.
obsid = 203151010 / Unique Observation/Sequence Number
object = FAIRALL9 / Object name
pi_name = HAGEN SCOTT / Proposal Principal Investigator Name
ra = 20.9425186751557 / Right Ascension (Pointing Position) (deg)
dec = -58.8074971459913 / Declination (Pointing Position) (deg)
roll_angle = 159.987824168494 / Roll Angle (deg)
start_time = 2026-09-25T03:21:04 / Start Time of the Observation
stop_time = 2026-09-29T11:33:04 / Stop Time of the Observation
exposure = 179897.69936 / Effective Total Observation Exposure (s)
public_date= 2099-12-31 / Public Date