Английская Википедия:H1821+643

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Шаблон:Short description Шаблон:Infobox quasar H1821+643 is an extraordinarily luminous, radio-quiet quasar in the constellation of Draco. The associated Active Galactic Nucleus (AGN) is situated in the Brightest Central Galaxy (BCG) of a massive (<math>\sim 6.3 \times 10^{14} M_\odot</math>), strong cooling flow cluster, CL 1821+64. Russel et al (2010) spatially isolated its X-ray signal from the surrounding cluster in Chandra X-ray observatory observations and computed <math>L_\odot = 10^{47} erg/s</math> from the observed X-ray luminosity.

Supermassive Black Hole

The SMBH centred in CL 1821+64 is believed to be among the most massive in the known Universe. A variety of techniques have found different values for the mass. 5 studies found values <math>M_{BH} \sim 10^9 M_\odot</math>. Kim et al (2004) and Floyd et al (2008) used galactic bulge luminosity fits derived from Hubble data to find <math>10^9 M_\odot</math> and <math>3 \times 10^9 M_\odot</math> respectively. Russell et al (2010) provided a rough estimate of <math>M_{BH} \sim 3 \times 10^9</math>[[Solar mass|Шаблон:Solar mass]]. This was an underestimate with <math>\log(\Delta M_{BH}/M_\odot) \geq 1</math>. Kolman et al (1991) and Shapovalova (2016) independently modelled the quasar UV spectrum to find <math>M_{BH} \sim 3 \times 10^9 M_\odot</math>. Capellupo et al (2017) found <math>M_{BH} \sim 3 \times 10^9</math> using <math>H\beta</math> line emissions. 2 independent X-ray studies found significantly higher values. Reynolds et al (2014) found <math>6\times10^9 M_\odot</math> by modelling reflection from the accretion disc and Walker et al found <math>3\times10^{10} M_\odot</math> by modelling the interaction of the black hole with the Intracluster medim (ICM) as a Compton-cooled feeding cycle. <math>M_{BH}</math> is in the range <math>\log(M_{BH}/M_\odot) \sim 9.2 - 10.5</math>.

The Schwarzschild diameter of this black hole is between Шаблон:Convert and Шаблон:Convert, which is about 16 times the diameter of Pluto's orbit. If the hole were a Euclidean sphere, the average density would be 18 g/m³, <math>\sim 1 \%</math> the density of air at sea level on Earth.

External links

• Simbad, SIMBAD
• NED, NED, NASA/IPAC Extragalactic Database

Шаблон:Quasar-stub