Astronomy and Astrophysics – Astrophysics
Scientific paper
1993-06-13
Astrophys.J. 419 (1993) 7
Astronomy and Astrophysics
Astrophysics
7 PostScript pages with 4 Figures (included), astro-ph/yymmnnn
Scientific paper
10.1086/173454
Nearby starburst galaxies have consistently shown anomalous Ly-alpha/H-beta ratios. By re-analysing the published IUE/optical observations, we show that most starbursts present a normal Ly-alpha emission, consistent with case B recombination theory, provided extinction laws appropriate to their metallicities are used. This implies that extinction is more important than multiple resonant scattering effects. The anomalous emission and absorption lines present in a few remaining galaxies are simply explained if they are observed in the post-burst phase, between about 10$^7$ and 10$^8$ yrs after the start of the burst. We use updated stellar population synthesis models to show that anomalous ratios are produced by the aging of stellar populations, since the underlying stellar Ly-alpha line is important in the cooler massive stars. The inferred low-duty cycle of massive star formation accounts naturally for the failure to detect large numbers of Ly-alpha--emitting galaxies in deep surveys and at high redshift. Some testable predictions of the proposed scenario are also discussed.
No associations
LandOfFree
On the Lyman-alpha Emission of Starburst 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 On the Lyman-alpha Emission of Starburst Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Lyman-alpha Emission of Starburst Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-710847