1999A&A...343..100B

Query : 1999A&A...343..100B

1999A&A...343..100B - Astronomy and Astrophysics, volume 343, 100-110 (1999/3-1)

Ultraviolet spectral properties of Magellanic and non-Magellanic irregulars, HII and starburst galaxies.

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

Abstract (from CDS):

This paper presents the results of a stellar population analysis performed on nearby (VR≤5000km/s) star-forming galaxies, comprising magellanic and non-magellanic irregulars, HII and starburst galaxies observed with the IUE satellite. Before any comparison of galaxy spectra, we have formed subsets according to absolute magnitude and morphological classification. Subsequently, we have coadded the spectra within each subset into groups of similar spectral properties in the UV. As a consequence, high signal-to-noise ratio templates have been obtained, and information on spectral features can now be extracted and analysed. Seven groups resulted from this procedure: the magellanic irregulars (including HII galaxies) produced two different blue spectral groups; the non-magellanic irregulars could be grouped into two spectral groups with rather peculiar properties; and the luminous starbursts produced one flat and two blue template spectra. Their stellar populations are analysed by means of a population synthesis algorithm based on star cluster spectral components. The synthetic spectra reproduce the observed ones successfully (except the non-magellanic irregular groups) both in terms of continuum distribution and spectral features. The synthesis flux fractions of different age groups were transformed into mass fractions, allowing inferences on the star formation histories. Young stellar populations (age <500Myrs) are the main flux contributors; in a few cases the intermediate age population (age≃1-2Myrs) is important, while the old bulge population contributes at most with ≃2% of the λ2646Å flux in the case of starburst galaxies, and is negligible in the magellanic irregulars. We also study the reddening values and the extinction law: an SMC-like extinction law is appropriate for all cases.

Abstract Copyright: ∼

Journal keyword(s): galaxies: compact - galaxies: irregular - galaxies: starbust - galaxies: stellar content - ultraviolet: galaxies

Simbad objects: 87

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Number of rows : 87
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1236 2
2 NGC 520 AG? 01 24 34.90 +03 47 29.4 12.41 12.24 11.42     ~ 513 3
3 NGC 625 AGN 01 35 04.632 -41 26 10.32 12.37 11.78 11.25 11.03 11.5 ~ 286 2
4 Mrk 600 AG? 02 51 04.57 +04 27 13.9 14.76 15.07 14.70 14.50 14.29 ~ 123 0
5 NGC 1140 EmG 02 54 33.5271666624 -10 01 43.142143908 12.41 12.84 12.49 13.6 13.5 ~ 286 1
6 NGC 1313 AG? 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 688 2
7 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1241 3
8 NGC 1614 Sy1 04 34 00.027 -08 34 44.57   14.66 13.99     ~ 667 0
9 NGC 1741 EmG 05 01 38.3 -04 15 25   13.7   13.02 13.6 ~ 266 0
10 NGC 1800 EmG 05 06 25.737 -31 57 15.21 13.51 13.19 12.70 12.48 12.9 ~ 178 1
11 Mrk 1094 bCG 05 10 48.1123757064 -02 40 53.685168744   14.0 14.4     ~ 88 1
12 Mrk 7 bCG 07 28 11.459 +72 34 23.18   13.9 14.15     ~ 78 0
13 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 564 3
14 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 769 0
15 IC 2184 PaG 07 29 27.015 +72 07 51.48   14.00       ~ 91 1
16 NGC 2537 AG? 08 13 14.643 +45 59 23.25 12.18 12.50 11.69 11.66   ~ 301 2
17 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 769 2
18 UGC 4483 GiG 08 37 03.00 +69 46 31.0 15.70 15.46 14.98 14.89   ~ 303 0
19 NGC 2684 GiG 08 54 54.0449415936 +49 09 37.459659996   13.4       ~ 47 0
20 NGC 2782 Sy2 09 14 05.1 +40 06 49 12.29 12.30 11.63     ~ 472 3
21 Mrk 19 Sy1 09 16 44.0406256248 +59 46 28.600811904   16.0 16.98     ~ 55 0
22 IC 2458 GiP 09 21 30.1318400448 +64 14 19.768079076   14.9       ~ 81 0
23 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 1106 1
24 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5861 6
25 NAME M 82 Group GrG 09 55 53.0 +69 40 50           ~ 27 0
26 ESO 435-20 EmG 09 59 21.226 -28 08 00.04   14.42 14.08 13.33   ~ 81 2
27 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 771 0
28 Mrk 25 AGN 10 03 51.9487763664 +59 26 10.665521556   14.96 14.42     ~ 133 0
29 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 848 2
30 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 665 1
31 Mrk 33 AG? 10 32 31.956 +54 24 03.53 13.29 13.66 13.13 12.71 12.27 ~ 368 1
32 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 359 1
33 Mrk 153 AG? 10 49 05.0478242832 +52 20 07.788652296   14.6       ~ 84 0
34 NGC 3396 GiP 10 49 55.939 +32 59 26.44   12.6 12.50     ~ 205 1
35 NGC 3432 AG? 10 52 31.132 +36 37 07.60   11.81 11.67 11.29   ~ 299 1
36 NGC 3448 AG? 10 54 39.240 +54 18 18.82   12.2       ~ 220 1
37 Mrk 36 SBG 11 04 58.298 +29 08 16.54   15.5 15.29     ~ 225 0
38 NGC 3622 GiG 11 20 12.429 +67 14 30.47   13.7       ~ 69 0
39 Mrk 170 AG? 11 26 50.460 +64 08 15.13   14.9       ~ 44 0
40 UGC 6456 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 335 1
41 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 978 4
42 NAME NGC 3690 West GiP 11 28 31.02 +58 33 40.7   11.8       ~ 629 4
43 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 631 4
44 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 280 0
45 NGC 3991 EmG 11 57 30.465 +32 20 03.00   13.8       ~ 156 1
46 NGC 3994 LIN 11 57 36.8662975416 +32 16 39.447161112   13.51 12.87     ~ 196 1
47 NGC 3995 rG 11 57 44.098 +32 17 38.64   12.81       ~ 166 0
48 NGC 4004 H2G 11 58 05.2253666472 +27 52 43.761225324   14.0       ~ 110 0
49 IC 3017 LIN 12 09 22.8215066592 +13 37 05.391212808           ~ 48 0
50 IC 3018 GiG 12 09 24.957 +13 34 29.06   15.3       ~ 57 0
51 NGC 4194 AGN 12 14 09.615 +54 31 35.93   13.79 13.30     ~ 448 2
52 MCG+01-31-030 GiP 12 15 18.322 +05 45 40.28   14.9       ~ 92 0
53 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 965 1
54 NGC 4236 GiG 12 16 42.118 +69 27 45.25 10.97 10.58 10.08 9.90   ~ 400 1
55 Mrk 209 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 346 0
56 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1125 1
57 NGC 4670 AG? 12 45 17.150 +27 07 31.76   12.6 12.90     ~ 259 0
58 Mrk 59 AGN 12 59 00.288 +34 50 42.45           ~ 317 2
59 NGC 4861 H2G 12 59 02.340 +34 51 33.98   12.90 12.32     ~ 383 2
60 UGC 8315 EmG 13 14 09.97 +39 08 43.6   15.6       ~ 20 0
61 Mrk 450 H2G 13 14 48.796 +34 52 53.18   14.9       ~ 87 0
62 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 471 0
63 NGC 5195 GiP 13 29 59.590 +47 15 58.06 10.76 10.45 9.55 9.31   ~ 778 3
64 ESO 383-44 EmG 13 37 27.821 -33 00 24.46   14.09 14.65 13.20 13.6 ~ 53 0
65 Mrk 67 EmG 13 41 56.4808997304 +30 31 09.652262088   16.5       ~ 94 0
66 NGC 5398 LSB 14 01 21.555 -33 03 49.62   12.87 12.39 11.99 12.6 ~ 132 1
67 NGC 5474 GiP 14 05 01.608 +53 39 43.95   11.28 10.79     ~ 443 1
68 NGC 5635 SyG 14 28 31.76167367 +27 24 32.2322942   13.9   12.12   ~ 127 1
69 NGC 5695 Sy2 14 37 22.1349838776 +36 34 04.201272336   14.55 13.60     ~ 201 0
70 Mrk 829 GiP 14 50 56.495 +35 34 18.27   14.5 14.83     ~ 209 0
71 Mrk 487 bCG 15 37 04.237 +55 15 47.60   15.2       ~ 132 0
72 UGC 10033 IG 15 46 56.1 +17 52 42           ~ 117 0
73 NGC 5996 H2G 15 46 58.8879549840 +17 53 03.045863148   13.2       ~ 157 0
74 Mrk 492 EmG 15 58 43.6725658968 +26 49 05.197674241   15.5       ~ 58 0
75 NGC 6052 AG? 16 05 12.8715178104 +20 32 32.607297132 13.01 13.44 13.00     ~ 351 2
76 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 235 4
77 ESO 103-35 Sy2 18 38 20.3204821536 -65 25 39.141804936   14.75 14.53 13.24   ~ 316 0
78 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1562 0
79 NGC 7250 AG? 22 18 17.776 +40 33 44.66 13.18 13.22 12.58     ~ 107 1
80 NAME NGC 1510 Group GrG ~ ~           ~ 1 0
81 NAME NGC 5253 Group GrG ~ ~           ~ 3 0
82 NAME NGC 1313 Group GrG ~ ~           ~ 3 0
83 NAME NGC 2782 Group GrG ~ ~           ~ 2 0
84 NAME NGC 3622 Group GrG ~ ~           ~ 1 0
85 NAME NGC 3256 Group GrG ~ ~           ~ 10 0
86 NAME NGC 3448 Group GrG ~ ~           ~ 1 0
87 NAME NGC 4449 Group GrG ~ ~           ~ 1 0

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