A RECOILING AND EXTREMELY ACCRETING SUPERMASSIVE BLACK HOLE IN A COOLING FLOW CLUSTER
We propose a 250 ks XRISM observation of H1821+643, a recoiling and extremely accreting supermassive black hole (SMBH) in a cooling flow cluster. Cooling flows are expected to have a huge impact on the active galactic nuclei (AGNs), yet they are scarcely observed in the local Universe, known as the cooling flow problem. H1821+643 is an irreplaceable target hosting cooling flows and a radio-quiet quasar. We will measure the turbulent motions within the cooling core to understand quasar-mode feedback. To comprehend how the SMBH acquires its large mass, we will also examine the AGN structure (torus, broad-line region, and accretion disk) by resolving the complex Fe lines. This observation will reveal new frontiers on the long-standing cooling flow problem and SMBH formation in cooling cores.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '201030010' / Observation identification string OBJECT = 'H1821+643' / Object name OBSERVER= 'SATOSHI YAMADA' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 275.4884 / [deg] Object Right ascension DEC_OBJ = 64.3434 / [deg] Object Declination RA_PNT = 275.494057903529 / Pointing RA DEC_PNT = 64.3451535860294 / Pointing DEC RA_NOM = 275.488927472562 / [deg] Nominal aspect point R.A. DEC_NOM = 64.3438611688527 / [deg] Nominal aspect point Dec. PA_NOM = 289.999644029951 / [deg] Nominal aspect point roll. TELAPSE = 513597 / Elapsed time DATE-OBS= '2024-09-04T02:53:54' / Start date DATE-END= '2024-09-10T01:33:51' / Stop date ONTIME = 278888.10063 / On-source time EXPOSURE= 278888.10063 / Exposure time PROCVER = '03.02.014.010' / Processing script version MKFFF = 'ISAS/JAXA' / Origin of First FITS file ORIGIN = 'GSFC/NASA' / Origin of Processed FITS file SOFTVER = 'Hea_12Mar2025_V6.35_XRISM_28Feb2025_V002' / Version of HEADAS used CALDBVER= 'gen20241115_xtd20241115_rsl20241115' / Version of CALDB used DATE = '2025-07-16T16:30:22' / Date and time this file was created or updated SIB2_VER= 'V04.00 ' / SIB2 version JAXA