2005MNRAS.358..781S


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST09:40:48

2005MNRAS.358..781S - Mon. Not. R. Astron. Soc., 358, 781-794 (2005/April-2)

Short time-scale optical variability of the dwarf Seyfert nucleus in NGC 4395.

SKELTON J.E., LAWRENCE A., PAPPA A., LIRA P. and ALMAINI O.

Abstract (from CDS):

We present optical spectroscopic observations of the least-luminous known Seyfert 1 galaxy, NGC 4395, which was monitored every half-hour over the course of three nights. The continuum emission varied by ∼35 per cent over the course of three nights and we find marginal evidence for greater variability in the blue continuum than the red. A number of diagnostic checks were performed on the data in order to constrain any systematic or aperture effects. No correlations were found that adequately explained the observed variability, hence we conclude that we have observed real intrinsic variability of the nuclear source. No simultaneous variability was measured in the broad Hβ line, although given the difficulty in deblending the broad and narrow components it is difficult to comment on the significance of this result. The observed short time-scale continuum variability is consistent with NGC 4395 having an intermediate-mass (∼105M) central supermassive black hole, rather than a very low accretion rate. Comparison with the Seyfert 1 galaxy NGC 5548 shows that the observed variability seems to scale with black hole mass in roughly the manner expected in accretion models. However, the absolute time-scale of variability differs by several orders of magnitude from that expected in simple accretion disc models in both cases.

Abstract Copyright: 2005 RAS

Journal keyword(s): galaxies: active - galaxies: individual: NGC 4395 - galaxies: Seyfert

Simbad objects: 8

goto Full paper

goto View the reference in ADS

Number of rows : 8

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 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 1002 0
2 BD+75 325 HS* 08 10 49.4901623070 +74 57 57.936226530 8.002 9.23 9.50 9.698 9.884 sdO5 235 0
3 Feige 34 HS* 10 39 36.7377085527 +43 06 09.209752646 9.613 10.91 11.14 11.319 11.464 sdOp 618 0
4 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 2034 1
5 HZ 21 WD* 12 13 56.2639830406 +32 56 31.359805342 13.125 14.361 14.688 14.837 15.038 DO1 136 0
6 NGC 4395 Sy2 12 25 48.8639154223 +33 32 48.694684028 10.84 10.54 10.11 9.98   ~ 1027 1
7 HZ 44 HS* 13 23 35.2632775627 +36 07 59.545982652 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 378 0
8 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2451 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2005MNRAS.358..781S and select 'bookmark this link' or equivalent in the popup menu


2021.04.16-09:40:48

© Université de Strasbourg/CNRS

    • Contact