Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-01-15
Astronomy and Astrophysics
Astrophysics
14 pages, 25 figures. Accepted to Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20020066
We present BVI photometry of ten Seyfert 1 galaxies and narrow band H-alpha images for six of these objects as well. The results indicate that the luminosity sample distribution has an amplitude of almost 4 magnitudes with an average of M_B=-20.7. The observed morphologies are confined to early type galaxies. A barred structure is found in only 2 objects. Despite that early morphological types are dominant in this sample, integrated (B-V) colors are very blue. For instance, the SO galaxies show, on average, a (B-V)=0.78. This effect seems to be caused by the luminosity contribution of the active nucleus and/or the disk to the total luminosity of the galaxy. In the B band, the contribution of the active galactic nucleus to the total luminosity of the galaxy varies from 3% to almost 60% and the bulge to disk luminosity ratio (L_bulge/L_disk) ranges from 0.6 to 22. Signs of tidal interactions seems to be a common characteristic since they are observed in 6 of the objects and one of them seems to be located in a poor cluster not yet identified in the literature. H_alpha extended emission is rare, with only 1 galaxy showing clear evidence of it. Luminosity profile decomposition shows that the model Gauss + bulge + disk properly reproduces the surface brightness of the galaxies. However, in order to account for the luminosity profile, most of the disk galaxies needs the inner truncated exponential form with a central cutoff radius ranging from 3 to 10 kpc. This is interpreted in terms of reddened regions that are well identified in the B-V color maps. These regions present very similar colors among them, with (B-V)~1.2. This fact could be associated to the presence of dust confined in the inner regions of the galaxies.
Boris N. V.
Donzelli Carlos José
Ferreiro D. L.
Pastoriza Miriani Griselda
Rodriguez-Ardila Alberto
No associations
LandOfFree
Multicolor photometry of ten Seyfert 1 galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Multicolor photometry of ten Seyfert 1 galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multicolor photometry of ten Seyfert 1 galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-553718