2010A&A...519A..40A


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET22:36:31

2010A&A...519A..40A - Astronomy and Astrophysics, volume 519, A40-40 (2010/9-1)

Nearby early-type galaxies with ionized gas. IV. Origin and powering mechanism of the ionized gas.

ANNIBALI F., BRESSAN A., RAMPAZZO R., ZEILINGER W.W., VEGA O. and PANUZZO P.

Abstract (from CDS):

A significant fraction of early-type galaxies (ETGs) exhibit emission lines in their optical spectra. We attempt to identify the producing the emission mechanism and the ionized gas in ETGs, and its connection with the host galaxy evolution. We analyzed intermediate-resolution optical spectra of 65 ETGs, mostly located in low density environments and exhibiting spectros-copic diagnostic lines of ISM from which we had previously derived stellar population properties. To extract the emission lines from the galaxy spectra, we developed a new fitting procedure that accurately subtracts the underlying stellar continuum, and accounts for the uncertainties caused by the age-metallicity degeneracy. Optical emission lines are detected in 89% of the sample. The incidence and strength of emission correlate with neither the E/S0 classification, nor the fast/slow rotator classification. By means of the classical [OIII]/Hβ versus [NII]/Hα diagnostic diagram, the nuclear galaxy activity is classified such that 72% of the galaxies with emission are LINERs, 9% are Seyferts, 12% are composite/transition objects, and 7% are non-classified. Seyferts have young luminostiy-weighted ages (≲5Gyr), and appear, on average, significantly younger than LINERs and composites. Excluding the Seyferts from our sample, we find that the spread in the ([OIII], Hα, or [NII]) emission strength increases with the galaxy central velocity dispersion σc. Furthermore, the [NII]/Hα ratio tends to increase with σc. The [NII]/Hα ratio decreases with increasing galactocentric distance, indicative of either a decrease in the nebular metallicity, or a progressive ``softening'' of the ionizing spectrum. The average nebular oxygen abundance is slightly less than solar, and a comparison with the results obtained in Paper III from Lick indices shows that it is ≃0.2dex lower than that of stars. The nuclear (r<re/16) emission can be attributed to photoionization by PAGB stars alone only for ≃22% of the LINER/composite sample. On the other hand, we cannot exclude an important role of PAGB star photoionization at larger radii. For the major fraction of the sample, the nuclear emission is consistent with excitation caused by either a low-accretion rate AGN or fast shocks (200-500km/s) in a relatively gas poor environment (n≲100cm–3), or both. The derived [SII]6717/6731 ratios are consistent with the low gas densities required by the shock models. The derived nebular metallicities are indicative of either an external origin of the gas, or an overestimate of the oxygen yields by SN models.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: ISM - galaxies: active - galaxies: abundances

VizieR on-line data: <Available at CDS (J/A+A/519/A40): table1.dat table2.dat table3.dat>

Simbad objects: 69

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Number of rows : 69

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 NGC 128 GiG 00 29 15.047 +02 51 50.60   13.2       ~ 190 0
2 NGC 777 Sy2 02 00 14.934 +31 25 45.78 13.09 12.49 11.45     ~ 160 2
3 NGC 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1171 2
4 NGC 1209 GiP 03 06 03.020 -15 36 40.58   12   11.42   ~ 132 0
5 NGC 1297 GiP 03 19 14.2295647877 -19 06 00.369591109   14.97 13.98 13.43 12.71 ~ 80 0
6 NGC 1366 GiG 03 33 53.658 -31 11 38.78   12.94   11.49   ~ 88 0
7 NGC 1380 GiP 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 382 1
8 NGC 1389 GiP 03 37 11.7424496792 -35 44 45.871664087 12.80 12.39 11.50 10.99   ~ 176 1
9 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1473 1
10 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1588 0
11 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 534 1
12 NGC 1426 GiG 03 42 49.0995354501 -22 06 30.172682100   12.21 11.44 10.90   ~ 185 0
13 NGC 1453 GiG 03 46 27.269 -03 58 07.55   13   11.30   ~ 155 0
14 IC 2006 EmG 03 54 28.427 -35 58 01.75   12.39   10.94 11.9 ~ 196 0
15 NGC 1521 GiG 04 08 18.937 -21 03 06.98   12.31   10.73   ~ 105 0
16 NGC 1533 GiG 04 09 51.8352578260 -56 07 06.404418566   11.77 10.92 10.27 11.0 ~ 179 0
17 NGC 1553 GiP 04 16 10.4711638537 -55 46 48.107262747 10.76 10.10 9.40 8.74   ~ 358 2
18 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15187 1
19 NGC 1947 GiG 05 26 47.613 -63 45 36.08   11.76 10.80 10.06   ~ 121 0
20 NGC 2749 GiG 09 05 21.313 +18 18 47.25   13.3       ~ 83 0
21 NGC 2911 LIN 09 33 46.1074035 +10 09 08.822404   14.96 13.83     ~ 227 0
22 NGC 2962 GiP 09 40 53.9319870230 +05 09 57.021439517   13.1       ~ 183 0
23 NGC 2974 Sy2 09 42 33.267 -03 41 56.82   12.19   10.77   ~ 415 0
24 NGC 3136 GiG 10 05 48.157 -67 22 40.74   11.60 11.00 10.05   ~ 96 0
25 NGC 3258 BiC 10 28 53.588 -35 36 19.98   12.50 11.72 10.86   ~ 171 0
26 NGC 3268 BiC 10 30 00.655 -35 19 31.83   12.57 11.77 10.68   ~ 143 0
27 NGC 3489 GiG 11 00 18.5473550222 +13 54 04.215155077 11.46 11.12 10.29     ~ 366 1
28 NGC 3557 rG 11 09 57.653 -37 32 21.02   11.50 10.40 9.79   ~ 259 2
29 [VV2006] J111654.8+180304 QSO 11 16 54.657 +18 03 06.51   13.84 12.76     ~ 441 0
30 NGC 3818 GiG 11 41 57.3592664401 -06 09 20.448440482   13   11.78   ~ 171 0
31 NGC 3962 LIN 11 54 40.104 -13 58 29.95   13.16 12.16 11.15   ~ 144 0
32 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1662 2
33 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5978 0
34 IC 3370 LIN 12 27 37.310 -39 20 16.13   11.99 12.12 10.39   ~ 143 0
35 M 89 LIN 12 35 39.8073444 +12 33 22.830809 11.29 10.73 9.75     ~ 938 2
36 NGC 4636 LIN 12 42 49.867 +02 41 16.01   12.62 11.84     ~ 1048 1
37 NGC 4697 GiG 12 48 35.8992791099 -05 48 02.497675635   10.97   9.83   ~ 813 0
38 NGC 4696 BiC 12 48 49.277 -41 18 39.92   11.21   10.7   ~ 459 3
39 NGC 5011 GiG 13 12 51.848 -43 05 46.25   12.14 11.33 10.51   ~ 85 0
40 NGC 5044 BiC 13 15 23.969 -16 23 08.00   11.9   10.74   ~ 460 0
41 NGC 5077 GiP 13 19 31.66964077 -12 39 25.0754790   13.87 12.85 11.30   ~ 276 0
42 NGC 5090 rG 13 21 12.8447 -43 42 16.839   12.59 11.51 10.84   ~ 189 1
43 NGC 5193 BiC 13 31 53.5250724472 -33 14 03.581095928   12.69 11.92 11.31   ~ 98 0
44 IC 4296 AGN 13 36 39.03275288 -33 57 57.0783023   11.52 12.99 10.00   ~ 455 2
45 NGC 5266 GiG 13 43 02.120 -48 10 09.77   11.89 11.14 11.9 11.3 ~ 158 0
46 NGC 5328 GiG 13 52 53.313 -28 29 21.38   12.74   11.11   ~ 94 0
47 NGC 5363 GiP 13 56 07.244 +05 15 16.92 12.59 12.12 10.51     ~ 210 0
48 NGC 5638 GiP 14 29 40.389 +03 14 00.39 12.57 12.14 11.20     ~ 229 2
49 NGC 5812 GiP 15 00 55.708 -07 27 26.33   12   11.19   ~ 151 0
50 NGC 5813 LIN 15 01 11.265 +01 42 07.09 12.00 11.45 10.46 10.06   ~ 588 1
51 NGC 5831 GiG 15 04 07.024 +01 13 11.70   13.1   11.19   ~ 281 0
52 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 786 1
53 NGC 5898 GiG 15 18 13.554 -24 05 52.66   12.37 11.52 10.71   ~ 147 1
54 NGC 6721 GiG 19 00 50.815 -57 45 33.77   13.23 12.04 11.48   ~ 67 0
55 NGC 6758 GiG 19 13 52.317 -56 18 35.65   12.53 11.56 10.83   ~ 79 0
56 NGC 6776 G 19 25 19.131 -63 51 36.68   13.19 11.99 11.59   ~ 85 0
57 NGC 6868 GiP 20 09 54.082 -48 22 46.25   11.58 9.22 10.01 7.91 ~ 207 1
58 NGC 6875 G 20 13 12.5010226975 -46 09 41.633031910   12.90 11.78 11.41   ~ 56 0
59 NGC 6876 GiG 20 18 19.146 -70 51 31.80   11.76 11.54 10.45   ~ 122 0
60 NGC 6958 G 20 48 42.6063609433 -37 59 50.877744163 12.79 12.27 11.42 10.83   ~ 144 1
61 IC 5063 Sy2 20 52 02.329 -57 04 07.60   12.92 13.60 11.30   ~ 564 1
62 NGC 7007 G 21 05 27.927 -52 33 06.94   12.89 12.04 11.43   ~ 60 0
63 NGC 7079 GiG 21 32 35.2427054889 -44 04 03.412493925   12.63 11.61 11.08   ~ 114 0
64 NGC 7097 GiP 21 40 12.883 -42 32 21.81   12.66 11.71 11.21   ~ 113 0
65 NGC 7135 AGN 21 49 45.9999195577 -34 52 34.589482636   12.25 13.30 10.84   ~ 81 0
66 NGC 7192 GiG 22 06 50.178 -64 18 58.38   12.21 11.21 10.77   ~ 135 0
67 NGC 7332 GiP 22 37 24.522 +23 47 54.06   12.0       ~ 358 0
68 NGC 7377 LIN 22 47 47.505 -22 18 43.46   11.39 12.78 10.53   ~ 91 0
69 IC 1459 GiP 22 57 10.60677155 -36 27 43.9953697   10.96 11.85 9.34 10.3 ~ 583 2

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2021.02.24-22:36:31

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