A Hardening of the Ionizing Radiation across Spiral Discs?

Details A Hardening of the Ionizing Radiation across Spiral Discs? A Hardening of the Ionizing Radiation across Spiral Discs?

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..421..277p&link_type=abstract

Galaxies in Isolation: Exploring Nature Versus Nurture, proceedings of a conference held 12 to 15 May 2009 in Granada, Spain. Ed

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Scientific paper

In this contribution we study the effective temperature of ionizing clusters of HII regions by means of the so-called softness parameters, as defined using some bright emission lines in the optical and the mid-infrared part of the spectrum. We then explore the galactocentric variation of these parameters across the star-forming regions of the discs of spiral galaxies. We find that the existence of a gradient is not universal, but that its presence and strength is unexpectedly correlated with other properties of the host galaxy.

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