Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..304a&link_type=abstract
SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present the results of local straburst galaxies imaging with the HST/ACS and NTT/NOT observations. HST/ACS narrow bands imaging allows us, using an elaborated SED modeling method with Starburst 99, to correctly subtract the extrapolated continuum from F140LP to F122M to get Lyα line image. Hα and Hβ observations have been carried out on the ground based facilities, the ESO New Technology Telescope (NTT) and the Nordic Optical Telescope (NOT). We have generated extinction maps using the Balmer decrement Hα/Hβ to investigate the dust in the gas phase. With dust maps and continuum-subtracted Lyα images, we have undertaken a correlation studies between all the relevant parameters, that could explain the escape mechanism of Lyα photons, in each galaxy at a very small scale. We found that, for the six galaxies in our sample, the bulk of Lyα is seen in a diffuse and low surface brightness componenent, hence highlighting the effect of resonant scattering in the neutral gas. The escape fraction of Lyα photons is still very small and never exceed 15%. Not only the Hα and UV continuum morphology is not correlated with the Lyα one, but even the dust appears to not really explain in all cases the visibility of the Lyα line. The dust is the main regulator of the Lyα escape in a static and homogeneous medium. Otherwise, the kinematics of the neutral ISM and its porosity and geometry may play a more significant role.
Atek Hakim
Kunth Daniel
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