1998A&AS..127..527D


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.26CEST06:38:20

1998A&AS..127..527D - Astron. Astrophys., Suppl. Ser., 127, 527-542 (1998/February-1)

Imaging and spectroscopy of ten southern galaxies selected from a catalogue of peculiar galaxies.

DONZELLI C.J. and FERREIRO D.L.

Abstract (from CDS):

We present BVRI broad band photometry and long slit spectroscopy for a sample of ten southern galaxies selected from the Agueero Catalogue of Peculiar Galaxies. The analysis of the images shows that only four galaxies of the sample are truly peculiar galaxies and four are normal spirals. The remaining two galaxies, a normal spiral and a SO, form an interacting pair. Despite the rather complicated structure of the peculiar galaxies we did not find evidence of mergers in our analysis of images and rotation curves. Almost all galaxies in our sample show star forming regions with very blue colors, (B-V) ranging from 0.2 to 0.6. The SO galaxy shows a very interesting structure in the V-I color map suggesting that star formation events have occurred in concentric annuli centered in the nucleus. In our photometric analysis we did not find characteristics that could distinguish between normal and peculiar galaxies. We obtained the ``pure-emission'' line spectra for six galaxies of the sample by subtracting appropriate templates. These templates correspond to ellipticals selected from our library of spectra. This subtraction technique provides a powerful tool to calculate line flux ratios uncontaminated by the underlying stellar population. Our spectroscopic analysis confirms that the spiral galaxy of the interacting system AM 2054-433 has a LINER-type nucleus. In the normal galaxy ESO 316-29 we find evidence of a LINER nucleus and we report a new Seyfert 2 galaxy, AM 2054-433 N. For this SO galaxy the line flux ratios measured from the pure-emission spectrum are indicative of a Seyfert 2 rather than a LINER nucleus as it was previously reported by other authors. Three of the four peculiar galaxies in our sample have much higher star-formation rate than normal galaxies, as measured by Hα+[NII] line emission. The observed EW(Hα+[NII]) values for these peculiar galaxies are around 60Å, compared to 22Å for normal galaxies. Whole-aperture spectra for these peculiar galaxies show very similar EW(Hα+[NII]) values to those observed in their nuclear region suggesting that a global starburst has occurred. Although our sample is small the results presented suggest that peculiar morphology and global starburst events are closely related.

Abstract Copyright:

Journal keyword(s): galaxies: peculiar - galaxies: photometry - galaxies: starburst - galaxies: interactions

Status at CDS:  

CDS comments: IRAS 23260-4116 misprint for IRAS 23260-4136

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ESO 316-29 GiG 10 07 44.974 -41 19 53.93   14.65 14.45 13.03   ~ 21 0
2 ESO 317-34 GiG 10 29 00.7066800330 -40 04 57.926400059   13.19   12.25 12.9 ~ 24 0
3 ESO 317-41 GiG 10 31 23.1120594445 -42 03 38.239631135   14.42   13.18   ~ 42 0
4 NGC 3318 G 10 37 15.5059609118 -41 37 38.926040274   12.71 11.97 11.77 12.4 ~ 78 0
5 NGC 3378 GiG 10 46 43.2650089810 -40 00 57.756625754   13.48   12.02   ~ 14 0
6 ESO 266-15 G 11 40 55.723 -44 28 52.34   13.18   12.04 12.9 ~ 36 0
7 ESO 340-21 GiG 20 22 29.121 -41 54 02.90   13.88   12.50   ~ 15 0
8 ESO 286-17 Sy2 20 57 49.4390672542 -43 21 05.656548801   14.49   13.16   ~ 18 0
9 ESO 286-18 GiP 20 57 50.325 -43 22 27.62   14.30   12.77 13.2 ~ 48 0
10 IC 5325 GiG 23 28 43.4233727817 -41 19 59.731959446 11.80 11.89 11.27 10.73 11.5 ~ 91 1

    Equat.    Gal    SGal    Ecl

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