Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasp..109...69a&link_type=abstract
Publications of the Astronomical Society of the Pacific, v.109, p.69
Astronomy and Astrophysics
Astronomy
Scientific paper
The near infrared (near IR) imaging technique in the $J$ ($1.25\,\mu$m), $H$ ($1.65\,\mu$m), $K$ ($2.2\,\mu$m) and $L$ ($3.5\,\mu$m) bands has been applied to study the stellar and non-stellar processes in two types of emission-line galaxies: starburst galaxies and Seyfert 2 galaxies. In the first part of this work, we have carried out a detailed study of the star formation (SF) history in a small sample of starburst galaxies selected from the UCM (Universidad Complutense de Madrid) survey. We have combined optical imaging (Gunn-Thuan $r$) and spectroscopy, and near IR imaging ($JHK$) imaging withpopulation synthesis models. These models, which account for the stellar component, have been complemented with the gas contribution in the form of continuum and emission lines produced by H and He. We have computed the time evolution of the equivalent widths (EW) of H emission lines (H$\beta$, H$\alpha$ and Br$\gamma$), and optical--near IR ($rJHK$) photometric magnitudes for different assumptions for the initial mass function (IMF) and the star formation rate (SFR): instantaneous bursts and constant SF. The model results are used to investigate the SF processes in a sample of starburst galaxies. In the second part of this work, near-IR images ($JHKL$) of an optically selected sample of Seyfert 2 galaxies have been used to study their stellar and non-stellar components. Finally, we compare the hard X-rays ($2-10\,$keV), [O\,Iii]$\lambda\,$5007 and $L$-band properties of low-redshift PG (Palomar-Green) quasars, Seyfert 1s and 2s to infer the torus induced reddening in the latter. (SECTION: Dissertation Summaries)
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