2010ApJ...725.1749T

Query : 2010ApJ...725.1749T

2010ApJ...725.1749T - Astrophys. J., 725, 1749-1767 (2010/December-3)

A multi-wavelength study of the nature of type 1.8/1.9 Seyfert galaxies.

TRIPPE M.L., CRENSHAW D.M., DEO R.P., DIETRICH M., KRAEMER S.B., RAFTER S.E. and TURNER T.J.

Abstract (from CDS):

We focus on determining the underlying physical cause of a Seyfert galaxy's appearance as type 1.8 or 1.9. Are these "intermediate" Seyfert types typical Seyfert 1 nuclei with reddened broad-line regions? Or are they objects with intrinsically weak continua and broad emission lines? We compare measurements of the optical reddening of the narrow and broad-line regions with each other and with the X-ray column derived from XMM-Newton 0.5-10 keV spectra to determine the presence and location of dust in the line of sight. We also searched the literature to see if the objects showed evidence for broad-line variability, and determined if the changes were consistent with a change in reddening or a change in the intrinsic ionizing continuum flux. We find that 10 of 19 objects previously classified as Seyfert 1.8/1.9s received this designation due to their low continuum flux. In four objects, the classification was due to broad emission-line region reddening, either by the torus or dust structures in the vicinity of the narrow emission-line region; in the remaining five objects there is not sufficient evidence to favor one scenario over the other. These findings imply that, in general, samples of 1.8/1.9s are not suitable for use in studies of gas and dust in the central torus.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: Seyfert - infrared: galaxies - X-rays: galaxies

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Z 478-15 Sy2 00 03 09.6087980256 +21 57 36.971989884   15.30 14.62     ~ 212 1
2 Z 502-82 Sy2 01 25 31.4551524072 +32 08 10.473856512   15.01 13.96     ~ 237 0
3 Z 412-46 Sy2 01 55 22.0278511032 +06 36 42.434344476   14.449 13.619 13.090 12.381 ~ 157 0
4 Z 387-34 Sy1 02 06 15.9896281128 -00 17 29.221733688   15.90 15.50 10.3   ~ 405 0
5 Mrk 1179 Sy1 02 33 22.3577650992 +27 56 13.362069840   16.49 15.23     ~ 47 0
6 Mrk 609 Sy2 03 25 25.3590639624 -06 08 37.947546528   14.72 14.12 10.9   ~ 212 0
7 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1987 2
8 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1153 0
9 Z 207-33 Sy2 08 07 40.9957797624 +39 00 15.247008108   14.90 14.08     ~ 190 0
10 NGC 2622 Sy2 08 38 10.9382999472 +24 53 42.993798288   15.01 14.12     ~ 174 1
11 NGC 2639 Sy2 08 43 38.0682469032 +50 12 19.942091604 12.90 12.56 11.65     ~ 451 2
12 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 951 3
13 Feige 34 HS* 10 39 36.7358839104 +43 06 09.212615280 9.613 10.91 11.14 11.319 11.464 sdOp 731 0
14 Z 66-94 Sy1 11 01 01.7740767504 +11 02 48.909646824   17.46 16.91     ~ 122 0
15 Z 185-66 Sy2 11 26 48.4988872152 +35 15 03.212861508   15.04 14.29     ~ 144 0
16 NGC 3786 Sy2 11 39 42.5121341928 +31 54 33.971791752   14.62 13.74     ~ 413 1
17 APG 294 GrG 11 39.7 +31 55           ~ 260 0
18 LAWD 37 WD* 11 45 42.9169346379 -64 50 29.461957832 11.08 11.725 11.513 11.34 11.163 DQ 287 0
19 NGC 3982 Sy2 11 56 28.1445516072 +55 07 30.859586652   12.20 11.70 11.18   ~ 588 1
20 Z 158-9 Sy2 12 04 43.3250093184 +31 10 38.182798092   14.82 14.01     ~ 219 1
21 Mrk 1320 Sy1 12 19 08.7332044272 -01 48 29.057258988   15.0 15     ~ 38 0
22 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1433 2
23 NGC 4639 Sy1 12 42 52.3785000336 +13 15 26.706153600   13.62 12.72     ~ 642 0
24 NGC 5033 Sy2 13 13 27.535 +36 35 37.14   11.01 12.03 9.73   ~ 909 1
25 NGC 5252 Sy2 13 38 15.8707724328 +04 32 33.521265600   15.21 14.21     ~ 514 1
26 NGC 5273 Sy1 13 42 08.3801616672 +35 39 15.467518836   14.01 13.12     ~ 510 0
27 NGC 5506 Bla 14 13 14.8761010056 -03 12 27.556909272   15.25 14.38     ~ 1173 1
28 Z 192-9 Sy2 14 22 55.3351468896 +32 51 02.303840160   15.27 14.42     ~ 148 1
29 NGC 5674 Sy2 14 33 52.2788150880 +05 27 30.117378924   13.7 13.70     ~ 197 0
30 Feige 98 HB* 14 38 15.7540358232 +27 29 32.910012348   11.7 11.7     sdB9IIIHe1 41 0
31 Z 138-23 Sy2 16 29 52.87032 +24 26 38.0976   15.40 14.43     ~ 130 0
32 FRL 49 Sy2 18 36 58.2335883144 -59 24 08.282326320   11.1   14.19   ~ 270 1
33 Z 403-4 Sy2 21 56 22.2667348968 +07 22 00.357100356   15.87 15.01     ~ 91 0
34 NGC 7314 Sy2 22 35 46.1985355872 -26 03 01.564993476   11.62 13.11 10.61 11.4 ~ 601 0
35 MCG-02-57-023 Sy2 22 36 46.4981814408 -12 32 42.887039748   15.35 14.50 13.6   ~ 192 0
36 Z 404-28 Sy1 22 40 17.0609184456 +08 03 13.539839976   15.30 14.45     ~ 202 1
37 NGC 7450 Sy1 23 00 47.8143025368 -12 55 06.530572776   15.19 14.33 13.4 13.3 ~ 139 0
38 NGC 7479 Sy2 23 04 56.6432243448 +12 19 22.357387020 11.74 11.60 10.85 10.47 9.66 ~ 783 2
39 NGC 7603 Sy1 23 18 56.6538277656 +00 14 37.977066096   14.73 14.01     ~ 438 0
40 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 673 1

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