1998A&A...334..439B

Query : 1998A&A...334..439B

1998A&A...334..439B - Astronomy and Astrophysics, volume 334439-452 (1998/6-2)

Probing nuclear starburst activity in a sample of nearby spiral galaxies.

BONATTO C., PASTORIZA M.G., ALLOIN D. and BICA E.

Abstract (from CDS):

As part of a systematic study of the UV properties of galaxies in the IUE library, we present in this paper an analysis of nuclear stellar populations in spiral galaxies with radial velocity ≤5000km/s. In this sample of 60 galaxies the IUE aperture probes a mean 1.0kpcx2.1kpc area. Prior to any comparison of galaxy spectra in the range covered by IUE (1200-3200Å), we have formed subsets according to the absolute magnitude and morphological type of the studied galaxies. In a second step, and within each subset, we have co-added the spectra, and hence the objects into groups of similar spectral properties in the UV, also taking into account their spectral properties in the visible/near-infrared ranges. As a result, high signal-to-noise ratio templates have been obtained, and information on spectral features can now be extracted and interpreted. We distinguish 4 groups for Sa, 8 for Sb, and 4 for Sc galaxies. We have carried out population syntheses using as base elements: HII regions, integrated star clusters, and far-UV weak elliptical galaxies as representative of bulge stellar population. The variety of UV spectral types found in the central regions of spiral galaxies can be readily explained by different mixtures of bulge, circumnuclear burst and disc populations. Across different morphological types, similar templates can also be found. This is due to compensation effects of bulge contribution with the disc and circumnuclear burst ones. Flux fractions derived from the population synthesis have been converted into mass contributions and inferences have been made on the star-formation histories. In the central kpc of the galaxies with strong UV flux, we find that the mass stored in the young components (t<500Myr) is typically ≃107M☉. We confirm that such star-formation enhancements occur preferentially in barred spirals. Internal reddening in the templates has been studied and inferences have been made on the corresponding reddening laws. We find cases where an SMC-like law applies and others where a faint λ2200Å absorption feature occurs resembling the reddening law of the LMC. The interest of the IUE data set resides in its rather large entrance aperture which samples a large portion of nearby galaxies, and is therefore quite suitable for the interpretation of large redshift galaxies.

Abstract Copyright: ∼

Journal keyword(s): galaxies: spiral - galaxies: starburst - galaxies: stellar content - galaxies: nuclei - ultraviolet: galaxies

Simbad objects: 79

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Number of rows : 79
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NGC 245 EmG 00 46 05.395 -01 43 24.21   13.7   13.3 12.9 ~ 97 0
3 NAME M31 Group GrG 00 47 28.6 +40 17 23           ~ 65 0
4 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
5 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
6 NGC 931 Sy1 02 28 14.4689104272 +31 18 41.469363324   15.71 14.74     ~ 426 1
7 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1448 3
8 NGC 1433 Sy2 03 42 01.4847418992 -47 13 18.929092656   10.84 9.99 9.61 10.2 ~ 447 0
9 NAME NGC 1433 Group GrG 03 57.5 -46 12           ~ 4 0
10 NGC 1672 SyG 04 45 42.552 -59 14 50.68 10.29 10.53 9.68 9.53 10.2 ~ 461 2
11 NAME NGC 1672 Group GrG 04 47 52.4 -59 41 54           ~ 8 0
12 NGC 1667 Sy2 04 48 37.1804579280 -06 19 11.824427712   13.66 12.86 11.72   ~ 384 2
13 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 756 3
14 NAME NGC 1808 Group GrG 05 08 10.8 -37 42 18           ~ 26 0
15 NGC 2146 AGN 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 765 2
16 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
17 Z 331-16 GiG 07 50 49.9404754872 +74 21 27.353103552   12.7       ~ 75 1
18 NGC 2639 Sy2 08 43 38.0682469032 +50 12 19.942091604 12.90 12.56 11.65     ~ 451 2
19 NGC 2681 LIN 08 53 32.7183058512 +51 18 49.159212120 11.40 11.09 10.29     ~ 332 1
20 NGC 2798 GiG 09 17 22.95407 +41 59 58.9560 13.03 13.04 12.32     ~ 338 3
21 APG 283 PaG 09 17 26.99 +41 59 48.8   12.2       ~ 193 1
22 NGC 2841 LIN 09 22 02.6778711696 +50 58 35.737082868 10.43 10.09 9.22     ~ 1113 1
23 NGC 2903 AGN 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 1204 3
24 NAME NGC 2997 Group GrG 09 43 54.7 -31 31 10           ~ 16 0
25 NGC 2997 GiG 09 45 38.7542237472 -31 11 27.345810192   9.97 9.41 8.84 9.9 ~ 454 1
26 NGC 3049 EmG 09 54 49.651 +09 16 17.90   13.04       ~ 346 1
27 NGC 3310 AGN 10 38 45.85707 +53 30 11.8940   12.45 12.15     ~ 809 1
28 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1238 2
29 APG 270 PaG 10 49 50.07 +32 58 55.4           ~ 186 1
30 NGC 3395 GiG 10 49 50.1160141680 +32 58 58.421838360   12.1 12.10     ~ 292 1
31 NGC 3504 LIN 11 03 11.19147 +27 58 20.7660   13.48 12.93     ~ 545 2
32 NGC 3682 GiG 11 27 41.1968165472 +66 35 23.382841812   13.40       ~ 95 0
33 NGC 3982 Sy2 11 56 28.1445516072 +55 07 30.859586652   12.20 11.70 11.18   ~ 588 1
34 NGC 3994 LIN 11 57 36.8662975416 +32 16 39.447161112   13.51 12.87     ~ 207 1
35 NGC 4102 Sy2 12 06 23.11513 +52 42 39.4160   11.8       ~ 449 1
36 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 582 1
37 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
38 NGC 4314 LIN 12 22 32.0223000912 +29 53 43.814812200 11.72 11.43 10.58     ~ 494 1
39 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1963 2
40 NAME Virgo N Cloud Cld 12 28 +16.3           ~ 14 0
41 NGC 4500 Sy2 12 31 22.1642532648 +57 57 52.686175392   13.2       ~ 141 1
42 M 88 Sy2 12 31 59.1525062448 +14 25 13.148971824   14.33 13.18     ~ 843 1
43 NAME CVn I Group GrG 12 32 48.3 +33 57 07           ~ 149 0
44 M 90 Sy2 12 36 49.8009839880 +13 09 46.523813040 10.56 10.26 9.54     ~ 953 1
45 M 58 Sy2 12 37 43.59747 +11 49 05.1240 10.80 10.48 9.66     ~ 1140 2
46 NAME M 104 Group GrG 12 39 59 -11 37.3           ~ 9 0
47 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1465 2
48 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1476 2
49 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 1010 2
50 NGC 5005 LIN 13 10 56.312 +37 03 32.19   14.67 13.67     ~ 567 2
51 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1292 2
52 NAME NGC 5194 Group GrG 13 23 18.2 +44 59 05           ~ 13 0
53 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
54 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
55 NAME NGC 5236 Group GrG 13 37 06 -29 51.9           ~ 75 0
56 NGC 5430 AGN 14 00 45.820 +59 19 43.14   12.7       ~ 261 1
57 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
58 NGC 6217 AGN 16 32 39.2100852960 +78 11 53.487076092   14.37 13.88     ~ 320 0
59 NGC 6221 Sy2 16 52 46.329 -59 13 00.99   10.90 13.45 9.68 10.4 ~ 328 0
60 NGC 6300 Sy2 17 16 59.5418094960 -62 49 13.946588832   10.88 13.08 9.44 10.2 ~ 478 1
61 NGC 6500 LIN 17 55 59.78218885 +18 20 17.6673590   13.43 12.54     ~ 232 1
62 NGC 6764 LIN 19 08 16.4036066688 +50 55 59.519979084   15.00 14.32     ~ 307 1
63 NGC 7130 Sy2 21 48 19.5412287192 -34 57 04.492024884   12.86 13.87 11.57   ~ 483 1
64 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15 25.10 ~ 572 2
65 NGC 7233 GiP 22 15 48.992 -45 50 47.06   12.90 12.82 11.81   ~ 55 0
66 NGC 7496 Sy2 23 09 47.2876854912 -43 25 40.279652796   11.92 13.90 10.95 11.5 ~ 350 1
67 NGC 7552 Sy1 23 16 10.66 -42 35 04.7 11.34 11.22 10.57 10.08 11.1 ~ 574 3
68 NGC 7582 Sy2 23 18 23.60 -42 22 13.3 11.62 10.92 10.62     ~ 978 3
69 NGC 7590 Sy1 23 18 54.7949760192 -42 14 20.515300476   12.12 13.76 11.06 11.8 ~ 290 1
70 NGC 7673 EmG 23 27 41.060 +23 35 20.18 12.84 13.17 12.76     ~ 282 2
71 NGC 7714 AGN 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 788 1
72 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 608 0
73 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1188 2
74 NAME NGC 7496 Group GrG ~ ~           ~ 1 0
75 NAME NGC 7552 Group GrG ~ ~           ~ 1 0
76 NAME NGC 4579 Group GrG ~ ~           ~ 1 0
77 NAME NGC 7130 Group GrG ~ ~           ~ 1 0
78 NAME NGC 598 Group GrG ~ ~           ~ 5 0
79 NAME NGC 2903 Group GrG ~ ~           ~ 7 0

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