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H-alpha +[NII] Observations of the HII Regions in M81 | W.P. Lin
; X. Zhou
; D. Burstein
; R.A. Windhorst
; J.S. Chen
; et al
; | Date: |
16 Jun 2003 | Journal: | Astron.J. 126 (2003) 1286 | Subject: | astro-ph | Affiliation: | SHAO), X. Zhou (NAOC), D. Burstein, R.A. Windhorst (ASU), J.S. Chen (NAOC | Abstract: | In a first of a series of studies of the H-alpha + [NII] emission from nearby spiral galaxies, we present measurements of H-alpha + [NII] emission from HII regions in M81. Our method uses large-field-CCD images and long-slit spectra, and is part of the ongoing Beijing-Arizona-Taipei-Connecticut Sky Survey. The CCD images are taken with the NAOC 0.6/0.9m f/3 Schmidt telescope at the Xinglong Observing Station, using a multicolor filter set. Spectra of 10 of the brightest HII regions are obtained using the NAOC 2.16m telescope with a Tek 1024 X 1024 CCD. The continua of the spectra are calibrated by flux-calibrated images taken from the Schmidt observations. We determine the continuum component of our H-alpha + [NII] image via interpolation from the more accurately-measured backgrounds (M81 starlight) obtained from the two neighboring (in wavelength) BATC filter images. We use the calibrated fluxes of H-alpha + [NII] emission from the spectra to normalize this interpolated, continuum-subtracted H-alpha + [NII] image. We estimate the zero point uncertainty of the measured H-alpha + [NII] emission flux to be $sim$ 8%. A catalogue of H-alpha + [NII] fluxes for 456 HII regions is provided, with those fluxes are on a more consistent linear scale than previously available. The logarithmically-binned H-alpha + [NII] luminosity function of HII regions is found to have slope $alpha$ = -0.70, consistent with previous results (which allowed $alpha=-0.5 sim -0.8$). From the overall H-alpha + [NII] luminosity of the HII regions, the star formation rate of M81 is found to be $sim 0.68 M_{odot} {
m yr}^{-1}$, modulo uncertainty with extinction corrections. | Source: | arXiv, astro-ph/0306302 | Services: | Forum | Review | PDF | Favorites |
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