2016A&A...586A..28B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST08:38:03

2016A&A...586A..28B - Astronomy and Astrophysics, volume 586A, 28-28 (2016/2-1)

On the relation of optical obscuration and X-ray absorption in Seyfert galaxies.

BURTSCHER L., DAVIES R.I., GRACIA-CARPIO J., KOSS M.J., LIN M.-Y., LUTZ D., NANDRA P., NETZER H., ORBAN DE XIVRY G., RICCI C., ROSARIO D.J., VEILLEUX S., CONTURSI A., GENZEL R., SCHNORR-MUELLER A., STERNBERG A., STURM E. and TACCONI L.J.

Abstract (from CDS):

The optical classification of a Seyfert galaxy and whether it is considered X-ray absorbed are often used interchangeably. There are many borderline cases, however, and also numerous examples where the optical and X-ray classifications appear to be in disagreement. In this article we revisit the relation between optical obscuration and X-ray absorption in active galactic nuclei (AGNs). We make use of our ``dust colour'' method to derive the optical obscuration AV, and consistently estimated X-ray absorbing columns using 0.3-150keV spectral energy distributions. We also take into account the variable nature of the neutral gas column NH and derive the Seyfert subclasses of all our objects in a consistent way. We show in a sample of 25 local, hard-X-ray detected Seyfert galaxies (logLX/(erg/s)≃41.5-43.5) that there can actually be a good agreement between optical and X-ray classification. If Seyfert types 1.8 and 1.9 are considered unobscured, the threshold between X-ray unabsorbed and absorbed should be chosen at a column NH=1022.3cm–2 to be consistent with the optical classification. We find that NH is related to AV and that the NH/AV ratio is approximately Galactic or higher in all sources, as indicated previously. However, in several objects we also see that deviations from the Galactic ratio are only due to a variable X-ray column, showing that (1) deviations from the Galactic NH/AV can be simply explained by dust-free neutral gas within the broad-line region in some sources; that (2) the dust properties in AGNs can be similar to Galactic dust and that (3) the dust colour method is a robust way to estimate the optical extinction towards the sublimation radius in all but the most obscured AGNs.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: Seyfert - dust, extinction

Simbad objects: 31

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Number of rows : 31

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1142 2
2 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4089 2
3 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1523 2
4 ESO 548-81 Sy1 03 42 03.7180399342 -21 14 39.646540303   12.84 13.68 11.57   ~ 100 0
5 NGC 1566 Sy1 04 20 00.4020009055 -54 56 16.578104141 10.29 10.19 9.73 9.21 10.1 ~ 717 2
6 NGC 2110 Sy2 05 52 11.3760694860 -07 27 22.489931610   14.77 13.51 11.86   ~ 582 1
7 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 785 3
8 ESO 434-40 Sy2 09 47 40.1345889569 -30 56 55.959492708   14.10 13.69 12.44   ~ 486 0
9 NGC 3081 Sy2 09 59 29.5436045645 -22 49 34.748021329   13.06 13.55 11.67 12.1 ~ 411 0
10 NGC 3227 GiP 10 23 30.57 +19 51 54.3   12.61 11.79     ~ 1530 2
11 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 313 0
12 NGC 3783 Sy1 11 39 01.7095761008 -37 44 19.008597647   12.46 13.43 11.33 12.1 ~ 1486 0
13 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 1991 1
14 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1183 2
15 NGC 4593 Sy1 12 39 39.4435521178 -05 20 39.035028119   13.95 13.15     ~ 948 0
16 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1777 3
17 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 3995 3
18 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1007 2
19 NGC 5506 AGN 14 13 14.901 -03 12 27.22   15.25 14.38     ~ 990 0
20 NGC 5643 Sy2 14 32 40.778 -44 10 28.60   11.03 13.60 9.92 10.6 ~ 450 0
21 NGC 5728 Sy2 14 42 23.928 -17 15 11.41   14.34 13.40     ~ 496 0
22 ESO 137-34 Sy2 16 35 14.114 -58 04 48.10   12.20   10.84 11.6 ~ 108 0
23 NGC 6300 Sy2 17 16 59.473 -62 49 13.98   10.88 13.08 9.44 10.2 ~ 358 0
24 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
25 NGC 6814 Sy1 19 42 40.5857305428 -10 19 25.102133898   15.33 14.21 11.7 11.3 ~ 720 0
26 IC 5063 Sy2 20 52 02.329 -57 04 07.60   12.92 13.60 11.30   ~ 543 1
27 NGC 7130 AGN 21 48 19.490 -34 57 04.73   12.86 13.87 11.57   ~ 381 0
28 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15   ~ 465 1
29 NGC 7213 Sy1 22 09 16.2106632887 -47 10 00.082166299   10.97 12.08 10.50 10.6 ~ 595 0
30 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1885 3
31 NGC 7582 GiP 23 18 23.621 -42 22 14.06 11.62 10.92 10.62     ~ 796 2

    Equat.    Gal    SGal    Ecl

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2020.07.05-08:38:03

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