H-alpha Photometric Survey of M33

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present the results of a photometric survey of optical emission line regions in M33. Using data from the Local Group Galaxy Survey (LGGS see Massey et al, 2006)), we created continuum-subtracted H-alpha, [OIII] and [SII] emission line images and used flux contours on the H-alpha images to define emission line regions. To date, we have obtained photometric measurements for over 2850 H -alpha emission regions, with a faint flux limit of 10 -15 ergs-sec-1-cm-2 in the outer regions of the galaxy. Our global H Ι region luminosity function displays a broad peak centered at a luminosity of 6 x 10 35 ergs-sec-1 and extends to fainter luminosities than previously published surveys. We used the H-alpha-defined emission regions to determine fluxes for the [OIII] and [SII] images and created RGB images combining the calibrated emission images from all three filters. These RGB emission line images are being used with our [OIII]/ H-alpha and [SII]/ H-alpha line ratios and published catalogs to develop visual diagnostic tools to identify H II regions, planetary nebulae and supernova remnants in M33. Additional results from the LGGS data are being presented elsewhere at this meeting; see Massey et al and McNeill et al.

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