2009A&A...507L..57K


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.27CET13:45:00

2009A&A...507L..57K - Astronomy and Astrophysics, volume 507, L57-60 (2009/12-1)

Exploring the inner region of type 1 AGNs with the Keck interferometer.

KISHIMOTO M., HOENIG S.F., ANTONUCCI R., KOTANI T., BARVAINIS R., TRISTRAM K.R.W. and WEIGELT G.

Abstract (from CDS):

The exploration of extragalactic objects with long-baseline interferometers in the near-infrared has been very limited. Here we report successful observations with the Keck interferometer at K-band (2.2µm) for four type 1 AGNs, namely NGC 4151, Mrk231, NGC 4051, and the QSO IRAS 13349+2438 at z=0.108. For the latter three objects, these are the first long-baseline interferometric measurements in the infrared. We detect high visibilities (V2∼0.8-0.9) for all the four objects including NGC 4151, for which we confirm the high V2 level measured by Swain et al. (2003ApJ...596L.163S). We marginally detect a decrease of V2 with increasing baseline lengths for NGC 4151, although over a very limited range, where the decrease and absolute V2 are well fitted with a ring model having a radius of 0.45±0.04mas (0.039±0.003pc). Strikingly, this matches independent radius measurements from optical-infrared reverberations that are thought to be probing the dust sublimation radius. We also show that the effective radius of the other objects, obtained from the same ring model, is either roughly equal to or slightly larger than the reverberation radius as a function of AGN luminosity. This suggests that we are indeed partially resolving the dust sublimation region. The ratio of the effective ring radius to the reverberation radius might also give us an approximate probe for the radial structure of the inner accreting material in each object. This should be scrutinized with further observations.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - infrared: galaxies - techniques: interferometric

Simbad objects: 6

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Number of rows : 6

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 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4176 2
2 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 2027 1
3 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3434 2
4 HD 111422 * 12 48 50.0040099398 +44 09 15.035088264   9.99 9.80     A5V 9 0
5 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1815 3
6 2RE J1337+244 Sy1 13 37 18.7198121987 +24 23 03.320690345     15.0     ~ 365 0

    Equat.    Gal    SGal    Ecl

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2021.02.27-13:45:00

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