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29 March 2024
 
  » arxiv » astro-ph/0306302

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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
AffiliationSHAO), X. Zhou (NAOC), D. Burstein, R.A. Windhorst (ASU), J.S. Chen (NAOC
AbstractIn 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
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