The influence of blending on synthetic model-based interpretation of the HII region luminosity function

Details The influence of blending on synthetic model-based interpretation of the HII region luminosity function The influence of blending on synthetic model-based interpretation of the HII region luminosity function

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9551t&link_type=abstract

HST Proposal ID #9551

Computer Science

Hst Proposal Id #9551 Galaxies

Scientific paper

The HII region luminosity function {HII LF}, as determined from HAlpha photometry, reflects vital information regarding the process of OB star cluster formation. Despite a growing collection of published LFs there is still no true consensus on the detailed form of the LF in spiral galaxies of various Hubble types. Part of the problem can be traced to lack of uniformity in observations and method of source photometry, but it also stems from not making optimal use of realistic models for the HII region population and associated OB clusters. To address these deficiencies, we are engaged in a joint observational / modeling project to analyze HII LFs for a complete sample of 175 nearby spirals. Our interpretation of these LFs is founded on fitting observational data with synthetic HII LFs. We have reached an impass at which the influence of blending on the LF as a function of spatial resolution must be quantified at small scales {> 15 pc}. Without this, we cannot fairly compare models against our seeing-limited data. We plan to analyze a collection of archival WFPC2 HAlpha images for 24 spirals taken from our ground-based survey. Using minimal spanning tree methods, we can characterize the clustering properties of HII regions on scales smaller than typically resolved from the ground. With this information, we will implement a blending correction to our synthetic models so they can be compared directly with our survey observations.

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