Abstract
Abstract
H1821+643 is the most X-ray luminous nonbeamed active galactic nucleus (AGN) of L
14–150 keV = 5.2 × 1045 erg s−1 in the Swift/Burst Alert Telescope (BAT) ultrahard X-ray survey, and it is also a hyperluminous infrared (IR) galaxy L
IR = 1013.2
L
⊙ residing in the center of a massive galaxy cluster, which is a unique environment achieving the rapid mass assembly of black holes (BH) and host galaxies in the local universe. We decompose the X-ray to IR spectral energy distribution (SED) into the AGN and starburst component using the SED-fitting tool CIGALE-2022.0 and show that H1821+643 consumes a large amount of cold gas (
M
̇
con
) with star formation rate of
log
(
SFR
/
M
⊙
yr
−
1
)
=
3.01
±
0.04
and BH accretion rate of
log
(
M
̇
BH
/
M
⊙
yr
−
1
)
=
1.20
±
0.05
. This high
M
̇
con
is larger than the cooling rate (
M
̇
cool
) of the intracluster medium,
M
̇
con
/
M
̇
cool
≳
1
, which is 1 to 2 orders of magnitude higher than the typical value of other systems, indicating that H1821+643 provides the unique and extreme environment of rapid gas consumption. We also show that H1821+643 has an efficient cooling path achieving from 107 to 102 K thanks to [O i] 63 μm, which is a main coolant in low temperature range (104 to 102 K) with a cooling rate of
M
̇
cool
=
3.2
×
10
5
M
⊙
yr
−
1
, and the star-forming region extends over 40 kpc scale.
Funder
MEXT ∣ Japan Society for the Promotion of Science
ANID ∣ Fondo Nacional de Desarrollo Científico y Tecnológico
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
1 articles.
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1. A cooling flow around the low-redshift quasar H1821+643;Monthly Notices of the Royal Astronomical Society;2024-01-23