J004457+4123 (Sharov 21): not a remarkable nova in M 31 but a background quasar with a spectacular UV flare

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Table 3:

Basic properties of Sharov 21 (remarks: see text).
Measured and derived quantities		Remark
RA (2000)	$00^{\rm h}44^{\rm m}57\hbox{$.\!\!^{\rm s}$ }94$	(1)
Dec (2000)	$+41\degr23\hbox{$^\prime$ }43\hbox{$.\!\!^{\prime\prime}$ }$ 9	(1)
redshift z	2.109
projected distance from M 31 centre	26 $^\prime$
apparent magnitude B	20.5/17.2	(2)
foreground dust reddening E(B-V)	0.2 mag
absolute magnitude $M_{\rm B}$	$-27.5/\!\!-30.7$	(2)
date of the maximum (year/JD)	1992.81/2448918
t_1/2 decline (days)	15/5	(3)
black hole mass $M_{\rm bh}$	$5\times10^8~M_\odot$	(4)
$\log~(L_{\rm bol}/$ erg s^-1)	46.6	(5)
Eddington ratio $L_{\rm bol}/L_{\rm edd}$	0.60	(5)

Source LaTeX | All tables | In the text

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