2007ApJS..171...72I


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST11:46:35

2007ApJS..171...72I - Astrophys. J., Suppl. Ser., 171, 72-100 (2007/July-0)

A Spitzer IRS low-resolution spectroscopic search for buried AGNs in nearby ultraluminous infrared galaxies: a constraint on geometry between energy sources and dust.

IMANISHI M., DUDLEY C.C., MAIOLINO R., MALONEY P.R., NAKAGAWA T. and RISALITI G.

Abstract (from CDS):

We present the results of Spitzer Infrared Spectrograph low-resolution infrared 5-35 µm spectroscopy of nearby ultraluminous infrared galaxies (ULIRGs) at z<0.15. We focus on the search for the signatures of buried active galactic nuclei (AGNs) in the complete sample of ULIRGs classified optically as non-Seyferts (LINERs or H II regions). In addition to polycyclic aromatic hydrocarbon (PAH) emission features at 6.2, 7.7, and 11.3 µm, the conventional tool of starburst-AGN separation, we use the optical depths of the 9.7 and 18 µm silicate dust absorption features to infer the geometry of energy sources and dust at the nuclei of these ULIRGs, namely, whether the energy sources are spatially well mixed with dust (a normal starburst) or are more centrally concentrated than the dust (a buried AGN). Infrared spectra of at least 30%, and possibly 50%, of the observed optical non-Seyfert ULIRGs are naturally explained by emission consisting of (1) energetically insignificant, modestly obscured (AV<20-30 mag) PAH-emitting normal starbursts and (2) energetically dominant, highly dust-obscured, centrally concentrated energy sources with no PAH emission. We interpret the latter component as a buried AGN. The fraction of ULIRGs showing some buried AGN signatures is higher in LINER ULIRGs than in H II region ULIRGs. Most of the luminous buried AGN candidates are found in ULIRGs with cool far-infrared colors. Where the absorption-corrected intrinsic AGN luminosities are derivable with little uncertainty, they are found to be of the order of 1012 L, accounting for the bulk of the ULIRGs' luminosities. The 5-35 µm spectroscopic starburst/AGN classifications are generally consistent with our previous classifications based on 3-4 µm spectra for the same sample.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: ISM - Galaxies: Nuclei - Galaxies: Seyfert - Galaxies: Starburst - Infrared: Galaxies

Simbad objects: 48

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Number of rows : 48

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 6dFGS gJ001143.3-072207 H2G 00 11 43.305 -07 22 07.37   18.41       ~ 50 0
2 2MASX J00212652-0839261 LIN 00 21 26.530 -08 39 26.15   18.37       ~ 96 1
3 IRAS 00456-2904 H2G 00 48 06.7010068082 -28 48 18.548437413   18.14       ~ 50 1
4 6dFGS gJ005040.3-270440 LIN 00 50 40.41 -27 04 38.3   18.369   18.305   ~ 33 0
5 IRAS 01003-2238 Sy2 01 02 49.9936617393 -22 21 57.258147027   18.62 18.9 17.83   ~ 140 0
6 6dFGS gJ011907.7-082910 H2G 01 19 07.568 -08 29 09.56   18.54       ~ 44 1
7 6dFGS gJ013221.4-072908 H2G 01 32 21.41 -07 29 08.5   19.04       ~ 55 0
8 2MASX J01591372-2924356 Sy1 01 59 13.725 -29 24 35.61   18.18 18.20     ~ 43 1
9 2MASX J02434617+0406377 H2G 02 43 46.172 +04 06 37.73           ~ 37 1
10 2MASX J03274981+1616594 LIN 03 27 49.812 +16 16 59.43       21.20   ~ 44 0
11 IRAS 04103-2838 LIN 04 12 19.4471694141 -28 30 24.951464125     16.9     ~ 63 0
12 NAME IRAS F08572+3915 NW LIN 09 00 25.364 +39 03 54.23     16.66     ~ 370 1
13 2MASX J09063400+0451271 LIN 09 06 34.003 +04 51 27.13           ~ 72 0
14 2MASX J09141380+0322009 LIN 09 14 13.7954266624 +03 22 01.313536758           ~ 42 0
15 LEDA 2816688 LIN 09 56 34.3 +08 43 06       20.90   ~ 53 0
16 3XMM J102142.6+130654 LIN 10 21 42.793 +13 06 56.04   17.51       ~ 67 3
17 2MASX J10402919+1053178 Sy1 10 40 29.1643651576 +10 53 18.203045589   17.79 17.18     ~ 85 0
18 LEDA 32516 LIN 10 51 03.67 -15 03 19.8           ~ 40 0
19 2MASX J10522356+4408474 LIN 10 52 23.518 +44 08 47.60           ~ 60 0
20 2dFGRS TGN232Z018 LIN 11 12 03.4 -02 54 23   17.45 17.40     ~ 85 1
21 6dFGS gJ111531.6-271622 LIN 11 15 31.56 -27 16 22.7   18.15   16.98   ~ 24 0
22 LEDA 2816771 LIN 11 41 22.031 +40 59 50.31           ~ 44 0
23 2MASX J11531422+1314276 H2G 11 53 14.226 +13 14 27.86   17.77       ~ 55 0
24 LEDA 39024 LIN 12 13 46.107 +02 48 41.50           ~ 315 1
25 2MASX J12151913-1429422 LIN 12 15 19.134 -14 29 42.23           ~ 35 0
26 6dFGS gJ123831.6-074226 LIN 12 38 31.60 -07 42 25.5   19.40   18.23   ~ 26 1
27 IRAS 13335-2612 LIN 13 36 22.29 -26 27 34.0           ~ 33 1
28 IRAS F13509+0442 H2G 13 53 31.579 +04 28 05.29           ~ 27 0
29 2MASX J13561001+2905355 AGN 13 56 09.992 +29 05 35.08   17.23       ~ 56 0
30 2MASX J14081899+2904474 H2G 14 08 18.992 +29 04 47.46           ~ 56 0
31 2MASX J14280106-1603400 LIN 14 28 01.069 -16 03 40.05   18.62   17.43   ~ 27 0
32 2MASX J14373831-1500239 Sy1 14 37 38.317 -15 00 23.97   16.58 16.40     ~ 248 1
33 IRAS 15206+3342 Sy2 15 22 38.104 +33 31 35.90           ~ 95 0
34 2MASX J15244389+2340099 H2G 15 24 43.890 +23 40 09.91           ~ 44 0
35 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2739 4
36 2MASX J16114042-0147062 LIN 16 11 40.4278789850 -01 47 06.559720269   16.6       ~ 68 0
37 LEDA 2817027 LIN 16 48 01.70 +51 55 44.4           ~ 31 0
38 LEDA 90258 H2G 16 49 14.092 +34 25 13.20           ~ 51 1
39 LEDA 90261 LIN 16 49 46.88 +54 42 35.4   17.5       ~ 60 1
40 2MASX J17034196+5813443 LIN 17 03 41.960 +58 13 44.37           ~ 50 0
41 2MASX J17042850+6716277 LIN 17 04 28.506 +67 16 27.78     17.0     ~ 49 0
42 6dFGS gJ204418.2-164017 LIN 20 44 18.186 -16 40 16.63   18.02   17.04   ~ 78 0
43 LEDA 1049091 H2G 21 23 29.19 -05 06 56.4           ~ 29 1
44 2MASX J21354580-2332359 LIN 21 35 45.8177743819 -23 32 36.301593274           ~ 32 1
45 6dFGS gJ222328.8-270003 H2G 22 23 28.909 -27 00 03.44   17.50       ~ 38 1
46 NAME South America H2G 22 51 49.307 -17 52 23.96   16.97       ~ 290 3
47 2MASX J23255611+1002500 LIN 23 25 56.118 +10 02 50.07           ~ 51 1
48 WISE J233511.92+293000.3 LIN 23 35 11.93 +29 30 00.2           ~ 47 0

    Equat.    Gal    SGal    Ecl

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2021.04.18-11:46:35

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