Narrowband CCD Photometry of Giant HII Regions

Details Narrowband CCD Photometry of Giant HII Regions Narrowband CCD Photometry of Giant HII Regions

2001-09-24

arxiv.org/abs/astro-ph/0109421v2

Mon.Not.Roy.Astron.Soc. 329 (2002) 481

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS, large figures available on a separate tarfile

Scientific paper

10.1046/j.1365-8711.2002.04967.x

We have obtained accurate CCD narrow band H_beta and H_alpha photometry of Giant HII Regions in M 33, NGC 6822 and M 101. Comparison with previous determinations of emission line fluxes show large discrepancies; their probable origins are discussed. Combining our new photometric data with global velocity dispersion (sigma) derived from emission line widths we have reviewed the L(H_beta)-sigma relation. A reanalysis of the properties of the GEHRs included in our sample shows that age spread and the superposition of components in multiple regions introduce a considerable spread in the regression. Combining the information available in the literature regarding ages of the associated clusters, evolutionary footprints on the interstellar medium, and kinematical properties of the knots that build up the multiple GEHRs, we have found that a subsample - which we refer to as young and single GEHRs - do follow a tight relation in the L-sigma plane.

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