Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-03-22
Mon.Not.Roy.Astron.Soc. 360 (2005) 253-271
Astronomy and Astrophysics
Astrophysics
14 pages, 16 figures (7 figures in jpeg format), accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09031.x
We present new important results about the intermediate-type Seyfert galaxy Mrk 315, recently observed through optical imaging and integral-field spectroscopy. Broad-band images were used to study the morphology of the host galaxy, narrow-band H-alpha images to trace the star forming regions, and middle-band [O III] images to evidence the distribution of the highly ionised gas. Some extended emission regions were isolated and their physical properties studied by means of flux calibrated spectra. High resolution spectroscopy was used to separate different kinematic components in the velocity fields of gas and stars. Some peculiar features characterise this apparently undisturbed and moderately isolated active galaxy. Such features, already investigated by other authors, are re-analysed and discussed in the light of these new observations. The most relevant results we obtained are: the multi-tiers structure of the disc; the presence of a quasi-ring of regions with star formation much higher than previous claims; a secondary nucleus confirmed by a stellar component kinematically decoupled by the main galaxy; a new hypothesis about the controversial nature of the long filament, initially described as hook-shaped, and more likely made of two independent filaments caused by interaction events between the main galaxy and two dwarf companions.
Afanasiev Victor L.
Botte V.
Ciroi Stefano
Dodonov Serguei N.
Mille F. Di
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