2005A&A...442..185B


Query : 2005A&A...442..185B

2005A&A...442..185B - Astronomy and Astrophysics, volume 442, 185-194 (2005/10-4)

A search for changing-look AGN in the Grossan catalog.

BIANCHI S., GUAINAZZI M., MATT G., CHIABERGE M., IWASAWA K., FIORE F. and MAIOLINO R.

Abstract (from CDS):

We observed with XMM-Newton 4 objects selected from the Grossan (1992, Ph.D. thesis) catalog, with the aim to search for new ``changing-look'' AGN. The sample includes all the sources which showed in subsequent observations a flux much lower than the one measured with HEAO A-1: NGC 7674, NGC 4968, IRAS 13218+0552 and NGC 1667. None of the sources was caught in a high flux state during the XMM-Newton observations, whose analysis reveal they are all likely Compton-thick objects. We suggest that, for all the sources, potential problems with the HEAO A-1 source identification and flux measurement prevent us from being certain that the HEAO A-1 data represent a putative ``high'' state for these objects. Nonetheless, based on the high flux state and Compton-thin spectrum of its GINGA observation, NGC 7674 represents probably the sixth known case of a ``changing-look'' Seyfert 2 galaxy. From the X-ray variability pattern, we can estimate a likely lower limit of a few parsec to the distance of the inner walls of the torus in this object. Remarkably, IRAS 13218+0552 was not detected by XMM-Newton, despite being currently classified as a Seyfert 1 with a large [OIII] flux. However, the original classification was likely to be affected by an extreme velocity outflow component in the emission lines. The object likely harbors an highly obscured AGN and should be re-classified as a type 2 source.

Abstract Copyright:

Journal keyword(s): galaxies: Seyfert - X-rays: galaxies - X-rays: individual: NGC 7674 - X-rays: individual: IRAS 13218+0552

Nomenclature: Table 6: [BGM2005b] NGC 7674 XN (Nos X1-X5), [BGM2005b] IRAS 13218+0552 XN (Nos X1-X2), [BGM2005b] NGC 1667 XN (Nos X1-X3).

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 77 GiP 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4323 2
2 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1639 2
3 2MASX J04442486-0648461 G 04 44 24.8605815000 -06 48 45.877347684   18.23   17.31   ~ 4 0
4 2MASX J04472072-0508138 Sy1 04 47 20.7258812832 -05 08 14.101533960   15.97 15.11 12.6   ~ 32 0
5 XMMU J044833.1-061716 X 04 48 33.2 -06 17 16           ~ 1 0
6 XMMU J044835.7-061810 X 04 48 35.7 -06 18 11           ~ 1 0
7 NGC 1667 Sy2 04 48 37.1804579280 -06 19 11.824427712   13.66 12.86 11.72   ~ 348 1
8 XMMU J044851.4-062135 X 04 48 51.4 -06 21 35           ~ 1 0
9 1RXS J045304.1-070011 EB* 04 53 04.4274771144 -07 00 23.506395984   11.99 11.13   10.284 K2V+K4/M4V 21 0
10 Mrk 3 Sy2 06 15 36.2812259376 +71 02 14.837219808 14.21 14.03 12.97     ~ 881 3
11 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 828 3
12 NGC 4051 Sy1 12 03 09.6101337312 +44 31 52.682601288   11.08 12.92 9.94   ~ 2078 1
13 ACO 3541 ClG 13 03 41.8 -24 15 06           ~ 23 0
14 NGC 4968 Sy2 13 07 05.976 -23 40 37.34   13.78 14.79 12.46   ~ 171 1
15 HD 114432 PM* 13 10 46.6092897855 -24 10 45.281741799   8.66 7.91     G7V 37 0
16 BAX 199.3086-25.5133 ClG 13 14 31.5049 -25 15 56.602           ~ 96 0
17 * gam Hya SB* 13 18 55.2971856 -23 10 17.451401 4.58 3.92 3.00 2.40 1.93 G8IIIa 170 0
18 RX J1320.7+0701 PM* 13 20 46.6795494456 +07 01 26.625560664   10.32 9.48 9.38 8.383 K3V 11 0
19 4FGL J1322.9+0437 BLL 13 23 01.0004175264 +04 39 51.412962744   20.22 18.80     ~ 35 0
20 LEDA 165618 Sy2 13 24 19.8862877976 +05 37 04.693531332   19.31 18.73 17.41   ~ 115 0
21 NVSS J132431+053254 Rad 13 24 31.9922620032 +05 32 52.870555212   19.5   19.1   ~ 3 0
22 2MASS J13244243+0524383 SyG 13 24 42.4410279072 +05 24 38.841526116   19.19 18.84     ~ 11 0
23 SDSS J132442.44+052438.9 X 13 29 45.6 +04 53 36           ~ 1 0
24 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1093 2
25 NGC 6300 Sy2 17 16 59.5418094960 -62 49 13.946588832   10.88 13.08 9.44 10.2 ~ 394 0
26 LEDA 3096725 Sy1 23 17 11.0822509392 +08 38 44.858251536   17.5 17.0     ~ 11 0
27 RX J2319.6+0819 X 23 19 37.1 +08 19 32           ~ 4 0
28 ACO 2588 ClG 23 23 44 +09 09.5           ~ 15 0
29 SAX J2327.4+0845 X 23 27 26.1 +08 45 50           ~ 2 0
30 [BGM2005b] NGC 7674 X3 X 23 27 28.0 +08 52 06           ~ 1 0
31 NGC 7674 Sy2 23 27 56.6973043968 +08 46 44.253707772 13.84 13.92 13.23 12.64   ~ 665 4
32 XMMU J232757.4+084744 X 23 27 57.4 +08 47 44           ~ 1 0
33 1WGA J2328.1+0849 X 23 28 07.3 +08 52 06           ~ 1 0
34 2MASX J23282907+0853013 G 23 28 29.0706535896 +08 53 01.988770164           ~ 1 0
35 RX J2328.9+0853 X 23 28 56.80 +08 53 46.0           ~ 4 0

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2022.05.24-23:37:14

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