Deriving star-formation and extinction in normal galaxies from H(alpha) and Paschen(beta) imaging

Details Deriving star-formation and extinction in normal galaxies from H(alpha) and Paschen(beta) imaging Deriving star-formation and extinction in normal galaxies from H(alpha) and Paschen(beta) imaging

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..268m&link_type=abstract

NOAO Proposal ID #1999B-0268

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Scientific paper

We propose to derive spatial maps of extinction corrected ionizing radiation and dust columns using narrow-band imaging in H(alpha) and Paschen(beta) of normal, nearby galaxies. This is possible because the intrinsic line ratios are insensitive to temperature and densities in HII regions. Comparison of observed line ratios to the intrinsic ones, using the extinction law, will yield column densities of dust near the HII regions. Using extinction corrected ionizing radiation and dust column maps we will derive the expected dust emission maps and compare them to the observed mid-infrared dust emission maps to determine how much heating of the dust is due to ionizing radiation. We will compare the extinction-corrected H(alpha) emission with other tracers of star- formation, far-infrared continuum and the main cooling lines of the interstellar gas [CII] (158 (mu)m) and [OI] (63 (mu)m). Corrected H(alpha) will also be used to estimate fraction of the [CII] (158 (mu)m) from ionized gas. This is necessary so we can compare the [CII] line fluxes to models of neutral photodissociation regions (PDRs) to derive mass, density, and pressure of the gas. The radiation densities derived for PDRs can also be compared the radiation column densities derived from corrected H(alpha) maps. All the data from ISO has been reduced and calibrated. We request time to do H(alpha) imaging of southern 1/4 of our sample and Pa(beta) imaging of a subset of galaxies.

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