2015AJ....149..155K


Query : 2015AJ....149..155K

2015AJ....149..155K - Astron. J., 149, 155 (2015/May-0)

HST imaging of fading AGN candidates. I. Host-galaxy properties and origin of the extended gas.

KEEL W.C., MAKSYM W.P., BENNERT V.N., LINTOTT C.J., CHOJNOWSKI S.D., MOISEEV A., SMIRNOVA A., SCHAWINSKI K., URRY C.M., EVANS D.A., PANCOAST A., SCOTT B., SHOWLEY C. and FLATLAND K.

Abstract (from CDS):

We present narrow- and medium-band Hubble Space Telescope imaging, with additional supporting ground-based imaging, spectrophotometry, and Fabry-Perot interferometric data, for eight galaxies identified as hosting a fading active galactic nucleus (AGN). These are selected to have AGN-ionized gas projected > 10 kpc from the nucleus and energy budgets with a significant shortfall of ionizing radiation between the requirement to ionize the distant gas and the AGN as observed directly, indicating fading of the AGN on ≈50,000 yr timescales. This paper focuses on the host-galaxy properties and origin of the gas. In every galaxy, we identify evidence of ongoing or past interactions, including tidal tails, shells, and warped or chaotic dust structures; a similarly selected sample of obscured AGNs with extended ionized clouds shares this high incidence of disturbed morphologies. Several systems show multiple dust lanes in different orientations, broadly fit by differentially precessing disks of accreted material viewed ∼1.5 Gyr after its initial arrival. The host systems are of early Hubble type; most show nearly pure de Vaucouleurs surface brightness profiles and Sérsic indices appropriate for classical bulges, with one S0 and one SB0 galaxy. The gas has a systematically lower metallicity than the nuclei; three systems have abundances uniformly well below solar, consistent with an origin in tidally disrupted low-luminosity galaxies, while some systems have more nearly solar abundances (accompanied by such signatures as multiple Doppler components), which may suggest redistribution of gas by outflows within the host galaxies themselves. These aspects are consistent with a tidal origin for the extended gas in most systems, although the ionized gas and stellar tidal features do not always match closely. Unlike extended emission regions around many radio-loud AGNs, these clouds are kinematically dominated by rotation, in some cases in warped disks. Outflows can play important kinematic roles only in localized regions near some of the AGNs. We find only a few sets of young star clusters potentially triggered by AGN outflows. In UGC 7342 and UGC 11185, multiple luminous star clusters are seen just within the projected ionization cones, potentially marking star formation triggered by outflows. As in the discovery example, Hanny's Voorwerp/IC 2497, there are regions in these clouds where the lack of a strong correlation between Hα surface brightness and ionization parameter indicates that there is unresolved fine structure in the clouds. Together with thin coherent filaments spanning several kpc, persistence of these structures over their orbital lifetimes may require a role for magnetic confinement. Overall, we find that the sample of fading AGNs occur in interacting and merging systems, that the very extended ionized gas is composed of tidal debris rather than galactic winds, and that these host systems are bulge-dominated and show no strong evidence of triggered star formation in luminous clusters.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: (NGC 5792, NGC 5252, UGC 7342, UGC 11185, Mkn 1498) - galaxies: interactions - galaxies: Seyfert

Nomenclature: Table 6: [KMB2015] Mkn 1498 N (Nos 1-3), [KMB2015] NGC 5972 NN (Nos 1-10), [KMB2015] Teacup N (Nos 1-7), [KMB2015] UGC 7342 NN (Nos 1-23), [KMB2015] UGC 11185 N (Nos 1-4).

Simbad objects: 65

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Number of rows : 65
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Mrk 78 Sy2 07 42 41.7033384240 +65 10 37.447730076   15.57 14.58     ~ 349 2
2 SDSS J094103.80+344334.1 G 09 41 03.80160 +34 43 34.1148           ~ 74 0
3 IC 2497 rG 09 41 04.1049384864 +34 43 58.172413980           ~ 61 0
4 [KMB2015] UGC 7342 1 Cl? 12 18 16.507 +29 15 25.87           ~ 1 0
5 [KMB2015] UGC 7342 2 Cl? 12 18 17.298 +29 15 20.77           ~ 1 0
6 [KMB2015] UGC 7342 3 Cl? 12 18 17.517 +29 15 19.31           ~ 1 0
7 [KMB2015] UGC 7342 4 Cl? 12 18 17.592 +29 15 17.80           ~ 1 0
8 [KMB2015] UGC 7342 19 Cl? 12 18 17.793 +29 14 58.70           ~ 1 0
9 [KMB2015] UGC 7342 5 Cl? 12 18 17.859 +29 15 15.93           ~ 1 0
10 [KMB2015] UGC 7342 18 Cl? 12 18 18.851 +29 14 59.02           ~ 1 0
11 [KMB2015] UGC 7342 23 Cl? 12 18 18.926 +29 15 14.85           ~ 1 0
12 [KMB2015] UGC 7342 20 Cl? 12 18 19.048 +29 15 29.21           ~ 1 0
13 [KMB2015] UGC 7342 17 Cl? 12 18 19.065 +29 14 40.70           ~ 1 0
14 [KMB2015] UGC 7342 22 Cl? 12 18 19.101 +29 15 13.86           ~ 1 0
15 [KMB2015] UGC 7342 6 Cl? 12 18 19.215 +29 15 27.95           ~ 1 0
16 [KMB2015] UGC 7342 7 Cl? 12 18 19.224 +29 15 28.41           ~ 1 0
17 UGC 7342 Sy2 12 18 19.3086078744 +29 15 13.037352948   15.97 15.09     ~ 33 0
18 [KMB2015] UGC 7342 8 Cl? 12 18 19.335 +29 15 28.77           ~ 1 0
19 [KMB2015] UGC 7342 21 Cl? 12 18 19.650 +29 15 12.25           ~ 1 0
20 KISS F1215-1628 EmG 12 18 20.1883065216 +29 14 47.790798000   17.80 16.98     ~ 8 0
21 [KMB2015] UGC 7342 11 Cl? 12 18 20.298 +29 15 02.67           ~ 1 0
22 [KMB2015] UGC 7342 13 Cl? 12 18 20.671 +29 14 52.95           ~ 1 0
23 [KMB2015] UGC 7342 14 Cl? 12 18 20.687 +29 14 52.43           ~ 1 0
24 [KMB2015] UGC 7342 10 Cl? 12 18 20.688 +29 15 06.16           ~ 1 0
25 [KMB2015] UGC 7342 9 Cl? 12 18 20.935 +29 15 31.25           ~ 1 0
26 [KMB2015] UGC 7342 15 Cl? 12 18 21.168 +29 14 48.42           ~ 1 0
27 [KMB2015] UGC 7342 16 Cl? 12 18 21.203 +29 14 47.07           ~ 1 0
28 [KMB2015] UGC 7342 12 Cl? 12 18 21.752 +29 14 53.63           ~ 1 0
29 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1287 2
30 NGC 4753 GiG 12 52 22.112 -01 11 58.88 11.26 10.85 9.95     ~ 267 1
31 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4320 3
32 NGC 5252 Sy2 13 38 15.8707724328 +04 32 33.521265600   15.21 14.21     ~ 458 0
33 [KMB2015] Teacup 2 Cl? 14 30 29.857 +13 39 09.02           ~ 1 0
34 NAME Teacup AGN Sy2 14 30 29.8820644560 +13 39 12.007458684   16.89 16.64     ~ 49 0
35 [KMB2015] Teacup 3 Cl? 14 30 29.907 +13 39 09.95           ~ 1 0
36 [KMB2015] Teacup 1 Cl? 14 30 29.910 +13 39 14.43           ~ 1 0
37 [KMB2015] Teacup 5 Cl? 14 30 30.131 +13 39 11.31           ~ 1 0
38 [KMB2015] Teacup 4 Cl? 14 30 30.137 +13 39 11.51           ~ 1 0
39 [KMB2015] Teacup 7 Cl? 14 30 30.151 +13 39 11.90           ~ 1 0
40 [KMB2015] Teacup 6 Cl? 14 30 30.155 +13 39 11.44           ~ 1 0
41 NGC 5792 EmG 14 58 22.709 -01 05 27.89   11.8   11.8 11.1 ~ 172 0
42 SDSS J151001.83+074058.4 Sy2 15 10 01.831 +07 40 58.49           ~ 1 0
43 2MASX J15100402+0740370 Sy2 15 10 04.0112809920 +07 40 37.130708532   16       ~ 12 0
44 [KMB2015] NGC 5972 6 Cl? 15 38 52.760 +17 01 39.35           ~ 1 0
45 [KMB2015] NGC 5972 7 Cl? 15 38 52.876 +17 01 43.77           ~ 1 0
46 [KMB2015] NGC 5972 4 Cl? 15 38 53.188 +17 01 40.49           ~ 1 0
47 [KMB2015] NGC 5972 5 Cl? 15 38 53.315 +17 01 34.56           ~ 1 0
48 [KMB2015] NGC 5972 2 Cl? 15 38 53.830 +17 01 37.16           ~ 1 0
49 [KMB2015] NGC 5972 3 Cl? 15 38 53.979 +17 01 40.28           ~ 1 0
50 NGC 5972 Sy2 15 38 54.1552716984 +17 01 34.346610984   14.60 14.27     ~ 47 1
51 [KMB2015] NGC 5972 1 Cl? 15 38 54.374 +17 01 29.88           ~ 1 0
52 [KMB2015] NGC 5972 10 Cl? 15 38 54.518 +17 01 09.83           ~ 1 0
53 [KMB2015] NGC 5972 9 Cl? 15 38 54.819 +17 01 20.50           ~ 1 0
54 [KMB2015] NGC 5972 8 Cl? 15 38 54.893 +17 01 37.06           ~ 1 0
55 [KMB2015] Mkn 1498 3 Cl? 16 28 02.826 +51 46 28.25           ~ 1 0
56 [KMB2015] Mkn 1498 2 Cl? 16 28 03.484 +51 46 29.17           ~ 1 0
57 [KMB2015] Mkn 1498 1 Cl? 16 28 03.675 +51 46 26.43           ~ 1 0
58 Mrk 1498 Sy1 16 28 04.0560946128 +51 46 31.477061100   17.0       ~ 97 0
59 UGC 11185 Sy2 18 16 09.3886288488 +42 39 23.010660432   15.9       ~ 26 0
60 [KMB2015] UGC 11185 3 Cl? 18 16 09.773 +42 39 41.80           ~ 1 0
61 [KMB2015] UGC 11185 4 Cl? 18 16 10.575 +42 39 42.21           ~ 1 0
62 [KMB2015] UGC 11185 1 Cl? 18 16 13.763 +42 39 44.60           ~ 1 0
63 [KMB2015] UGC 11185 2 Cl? 18 16 13.811 +42 39 43.45           ~ 1 0
64 2MASX J22014163+1151237 Sy2 22 01 41.6292212064 +11 51 24.381447048   15.6       ~ 20 0
65 NGC 7252 IG 22 20 44.7748209648 -24 40 41.909518200 12.26 12.46 12.06 11.57   ~ 687 1

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2023.01.30-19:55:17

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