2005A&A...431..465C


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET09:50:13

2005A&A...431..465C - Astronomy and Astrophysics, volume 431, 465-475 (2005/2-4)

The supermassive black hole in the Seyfert 2 galaxy NGC 5252.

CAPETTI A., MARCONI A., MACCHETTO D. and AXON D.

Abstract (from CDS):

We present results from HST/STIS long-slit spectroscopy of the gas motions in the nuclear region of the Seyfert 2 galaxy NGC 5252. The observed velocity field is consistent with gas in regular rotation with superposed localized patches of disturbed gas. The dynamics of the circumnuclear gas can be accurately reproduced by adding to the stellar mass component a compact dark mass of MBH=0.95(-0.45;+1.45)x109M, very likely a supermassive black hole (BH). Contrarily to results obtained in similar studies rotational broadening is sufficient to reproduce also the behaviour of line widths. The BH mass estimated for NGC 5252 is in good agreement with the correlation between MBH and bulge mass. The comparison with the MBH vs. σc relationship is less stringent (mostly due to the relatively large error in σc); NGC 5252 is located above the best fit line by between 0.3 and 1.2dex, i.e. 1-4 times the dispersion of the correlation. Both the galaxy's and BH mass of NGC 5252 are substantially larger than those usually estimated for Seyfert galaxies but, on the other hand, they are typical of radio-quiet quasars. Combining the determined BH mass with the hard X-ray luminosity, we estimate that NGC 5252 is emitting at a fraction ∼0.005 of LEdd. In this sense, this active nucleus appears to be a quasar relic, now probably accreting at a low rate, rather than a low black hole mass counterpart of a QSO.

Abstract Copyright:

Journal keyword(s): black hole physics - galaxies: active - galaxies: bulges - galaxies: nuclei - galaxies: Seyfert

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2170 3
2 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1662 2
3 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6350 3
4 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4075 3
5 NGC 5252 Sy2 13 38 15.8711551761 +04 32 33.525903711   15.21 14.21     ~ 436 0
6 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2154 2
7 NGC 7052 rG 21 18 33.047 +26 26 48.65 15.52 14.85 13.09     ~ 303 1

    Equat.    Gal    SGal    Ecl

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2021.03.01-09:50:13

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