2005A&A...433..497R


Query : 2005A&A...433..497R

2005A&A...433..497R - Astronomy and Astrophysics, volume 433, 497-513 (2005/4-2)

Nearby early-type galaxies with ionized gas. I. Line-strength indices of the underlying stellar population.

RAMPAZZO R., ANNIBALI F., BRESSAN A., LONGHETTI M., PADOAN F. and ZEILINGER W.W.

Abstract (from CDS):

With the aim of building a data-set of spectral properties of well studied early-type galaxies showing emission lines, we present intermediate resolution spectra of 50 galaxies in the nearby Universe. The sample, which covers several of the E and S0 morphological sub-classes, is biased toward objects that might be expected to have ongoing and recent star formation, at least in small amounts, because of the presence of the emission lines. The emission is expected to come from the combination of active galactic nuclei and star formation regions within the galaxies. Sample galaxies are located in environments corresponding to a broad range of local galaxy densities, although predominantly in low density environments. Our long-slit spectra cover the 3700-7250Å wavelength range with a spectral resolution of ≃7.6Å at 5550Å. The specific aim of this paper, and our first step in the investigation, is to map the underlying galaxy stellar population by measuring, along the slit positioned along the galaxy major axis, line-strength indices at several, homogeneous galacto-centric distances. For each object we extracted 7 luminosity-weighted apertures (with radii 1.5", 2.5", 10", re/10, re/8, re/4 and re/2) corrected for the galaxy ellipticity and 4 gradients (0≤r≤re/16, re/16≤r≤re/8, re/8≤r≤re/4 and re/4≤r≤re/2). For each aperture and gradient we measured 25 line-strength indices: 21 of the set defined by the Lick-IDS ``standard'' system (Trager et al., 1998ApJS..116....1T) and 4 introduced by Worthey & Ottaviani (1997ApJS..111..377W). Line-strength indices have been transformed to the Lick-IDS system. Indices derived then include Hβ, Mg1, Mg2, Mgb, MgFe, Fe5270, Fe5335 commonly used in classic index-index diagrams. The paper introduces the sample, presents the observations, describes the data reduction procedures, the extraction of apertures and gradients, the determination and correction of the line-strength indices, the procedure adopted to transform them into the Lick-IDS System and the procedures adopted for the emission correction. We finally discuss the comparisons between our dataset and line-strength indices available in the literature. A significant fraction, about 60%, of galaxies in the present sample has one previous measurement in the Lick-IDS system but basically restricted within the re/8 region. Line-strength measures obtained both from apertures and gradients outside this area and within the re/8 region, with the present radial mapping, are completely new.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: formation - galaxies: evolution

VizieR on-line data: <Available at CDS (J/A+A/433/497): table6.dat table7.dat table9.dat table10.dat>

Simbad objects: 67

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Number of rows : 67
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 NGC 128 GiG 00 29 15.0429950112 +02 51 50.564329164   13.2       ~ 194 0
2 NGC 777 Sy2 02 00 14.9065707744 +31 25 45.850721628 13.09 12.49 11.45     ~ 168 2
3 NGC 1052 GiP 02 41 04.7997864552 -08 15 20.761481016 11.84 11.41 10.47 10.71   ~ 1226 2
4 NGC 1209 GiP 03 06 03.020 -15 36 40.58   12   11.42   ~ 135 0
5 NGC 1297 GiP 03 19 14.2293540312 -19 06 00.356560524   14.97 13.98 13.43 12.71 ~ 81 0
6 NGC 1366 GiG 03 33 53.6940996096 -31 11 38.966332632   12.94   11.49   ~ 89 0
7 NGC 1380 GiP 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 397 1
8 NGC 1389 GiP 03 37 11.7427350576 -35 44 45.873195000 12.80 12.39 11.50 10.99   ~ 184 1
9 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 551 1
10 NGC 1426 GiG 03 42 49.0997091480 -22 06 30.173615028   12.21 11.44 10.90   ~ 188 0
11 HD 23430 * 03 45 59.1396677304 +25 23 54.931179624   8.25 8.05     A0 52 0
12 NGC 1453 GiG 03 46 27.2307890592 -03 58 07.831476768   13   11.30   ~ 162 0
13 IC 2006 EmG 03 54 28.4628183240 -35 58 01.673622516   12.39   10.94 11.9 ~ 200 0
14 NGC 1521 GiG 04 08 18.9110259504 -21 03 07.337782908   12.31   10.73   ~ 110 0
15 NGC 1533 GiG 04 09 51.8356041744 -56 07 06.410207352   11.77 10.92 10.27 11.0 ~ 187 0
16 NGC 1553 GiP 04 16 10.4697802536 -55 46 48.072797400 10.76 10.10 9.40 8.74   ~ 363 2
17 NGC 1947 GiG 05 26 47.613 -63 45 36.08   11.76 10.80 10.06   ~ 124 0
18 * G CMi PM* 08 02 15.9369212008 +02 20 04.458846354 6.91 5.63 4.38 3.39 2.72 K2IIIbFe-0.5: 177 1
19 * sig Hya * 08 38 45.4374649 +03 20 29.170097 6.91 5.63 4.43 3.54 2.98 K1III 135 0
20 NGC 2749 GiG 09 05 21.3397567968 +18 18 47.097417600   13.3       ~ 85 0
21 NGC 2911 LIN 09 33 46.1036936016 +10 09 08.868636288   14.96 13.83     ~ 231 0
22 * iot Hya PM* 09 39 51.3614457 -01 08 34.113491 6.68 5.23 3.91 2.92 2.25 K2.5III 170 0
23 NGC 2962 GiP 09 40 53.9321546928 +05 09 57.032828496   13.1       ~ 191 0
24 NGC 2974 Sy2 09 42 33.2918467632 -03 41 57.038311068   12.19   10.77   ~ 423 0
25 NGC 3136 GiG 10 05 48.0247938960 -67 22 40.395096300   11.60 11.00 10.05   ~ 97 0
26 NGC 3258 BiC 10 28 53.588 -35 36 19.98   12.50 11.72 10.86   ~ 176 0
27 NGC 3268 BiC 10 30 00.6490581240 -35 19 31.519591284   12.57 11.77 10.68   ~ 144 0
28 * alf Crt PM* 10 59 46.4651557828 -18 17 55.630394216 6.14 5.16 4.07 3.27 2.72 K0IIIb 209 0
29 NGC 3489 GiG 11 00 18.5483994744 +13 54 04.206202668 11.46 11.12 10.29     ~ 381 1
30 NGC 3557 rG 11 09 57.653 -37 32 21.02   11.50 10.40 9.79   ~ 264 2
31 [VV2006] J111654.8+180304 QSO 11 16 54.657 +18 03 06.51   13.84 12.76     ~ 448 0
32 NGC 3962 LIN 11 54 40.0986420456 -13 58 30.234748836   13.16 12.16 11.15   ~ 146 0
33 IC 3370 LIN 12 27 37.3278534168 -39 20 16.247588712   11.99 12.12 10.39   ~ 145 0
34 M 89 LIN 12 35 39.8073444 +12 33 22.830809 11.29 10.73 9.75     ~ 958 2
35 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1071 1
36 NGC 5077 GiP 13 19 31.6697719944 -12 39 25.086455856   13.87 12.85 11.30   ~ 280 0
37 IC 4296 AGN 13 36 39.03275288 -33 57 57.0783023   11.52 12.99 10.00   ~ 463 2
38 NGC 5328 GiG 13 52 53.313 -28 29 21.38   12.74   11.11   ~ 101 0
39 NGC 5363 GiP 13 56 07.244 +05 15 16.92 12.59 12.12 10.51     ~ 216 0
40 * 31 Boo V* 14 41 38.7511938264 +08 09 42.352458552   5.866 4.862     G7IIIa 154 0
41 * 18 Lib PM* 14 58 53.5813630608 -11 08 38.462393832   7.146 5.857     K3-IIICN2 117 0
42 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 811 1
43 NGC 5898 GiG 15 18 13.5683042256 -24 05 52.428845076   12.37 11.52 10.71   ~ 149 1
44 HD 136028 * 15 18 26.1268629072 -00 27 40.443035364 9.22 7.40 5.89     K2/3III 49 0
45 * ome Ser PM* 15 50 17.5468226304 +02 11 47.432004216   6.236 5.217     K0IV 123 1
46 * h Her PM* 16 32 36.2919015 +11 29 16.947932 8.16 6.34 4.85 3.65 2.79 K4.5III 149 0
47 * kap Oph LP? 16 57 40.0978499 +09 22 30.112596 5.52 4.36 3.20 2.36 1.82 K2III 294 0
48 * zet Ser PM* 18 00 29.0113725 -03 41 24.968552   4.982 4.616     F2V 185 0
49 V* V2564 Oph LP? 18 04 40.0713763656 +03 46 44.716990584 9.53 8.59 7.30 6.24 5.43 F6/7V 251 0
50 * 71 Oph * 18 07 18.3593981592 +08 44 01.922061912   5.592 4.640     G8III 170 0
51 * 106 Her PM* 18 20 17.9149366104 +21 57 40.667073804 8.54 6.54 4.96 3.62 2.62 M1III 94 0
52 HD 172401 SB* 18 39 39.6820576536 +08 43 58.122643908   8.08 7.01     K0III 28 0
53 NGC 6721 GiG 19 00 50.815 -57 45 33.77   13.23 12.04 11.48   ~ 68 0
54 HD 180928 PM* 19 19 00.0959552544 -15 32 11.647331124 9.06 7.49 6.06 4.94 4.11 K4III 93 0
55 NGC 6868 GiP 20 09 54.082 -48 22 46.25   11.58 9.22 10.01 7.91 ~ 211 1
56 NGC 6875 G 20 13 12.5017892736 -46 09 41.636505744   12.90 11.78 11.41   ~ 58 0
57 NGC 6876 GiG 20 18 19.146 -70 51 31.80   11.76 11.54 10.45   ~ 123 0
58 NGC 6958 G 20 48 42.6064604520 -37 59 50.876997504 12.79 12.27 11.42 10.83   ~ 147 1
59 IC 5063 Sy2 20 52 02.329 -57 04 07.60   12.92 13.60 11.30   ~ 596 1
60 NGC 7007 G 21 05 27.9140607744 -52 33 07.159314492   12.89 12.04 11.43   ~ 61 0
61 NGC 7079 GiG 21 32 35.2418074440 -44 04 03.412507188   12.63 11.61 11.08   ~ 117 0
62 NGC 7097 GiP 21 40 12.9231946008 -42 32 21.879559932   12.66 11.71 11.21   ~ 114 0
63 NGC 7135 AGN 21 49 46.0013389728 -34 52 34.575955536   12.25 13.30 10.84   ~ 87 0
64 NGC 7192 GiG 22 06 50.1107894976 -64 18 58.721070096   12.21 11.21 10.77   ~ 136 0
65 NGC 7332 GiP 22 37 24.5373044952 +23 47 53.830708800   12.0       ~ 362 0
66 NGC 7377 LIN 22 47 47.4743722752 -22 18 43.770561516   11.39 12.78 10.53   ~ 93 0
67 IC 1459 GiP 22 57 10.6071797352 -36 27 43.992307260   10.96 11.85 9.34 10.3 ~ 599 2

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2022.05.28-22:11:43

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