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H alpha plus [N II] observations of the HII regions in M81
Lin, WP; Zhou, X; Burstein, D; Windhorst, RA; Chen, JS; Chen, WP; Jiang, ZJ; Kong, X; Ma, J; Sun, WH; Wu, H; Xue, SJ; Zhu, J
AbstractIn a first of a series of studies of the Halpha + [N II] emission from nearby spiral galaxies, we present measurements of Halpha + [N II] emission from H II regions in M81. Our method uses large-field CCD images and longslit spectra and is part of the ongoing Beijing-Arizona-Taipei-Connecticut Sky Survey ( the BATC survey). The CCD images are taken with the National Astronomical Observatories of China (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 H II regions are obtained using the NAOC 2.16 m 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 Halpha + [N II] 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 Halpha + [N II] emission from the spectra to normalize this interpolated, continuum-subtracted Halpha + [N II] image. We estimate the zero-point uncertainty of the measured Halpha + [N II] emission flux to be similar to 8%. A catalog of Halpha + [N II] fluxes for 456 H II regions is provided, with those fluxes being on a more consistent linear scale than previously available. The logarithmically binned Halpha + [ N II] luminosity function of H II regions is found to have slope alpha = - 0.70, consistent with previous results ( which allowed alpha = -0.5 to - 0.8). From the overall Halpha + [ N II] luminosity of the H II regions, the star formation rate of M81 is found to be similar to 0.68 M-. yr(-1), modulo uncertainty with extinction corrections.
KeywordGalaxies : Individual (M81) Galaxies : Photometry Hii Regions
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WOS IDWOS:000185131900012
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Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Shanghai Astron Observ, MPI Astrophys, Partner Grp, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Peking Univ, Beijing Astrophys Ctr, Beijing 100871, Peoples R China
4.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
5.Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA
6.Natl Cent Univ, Inst Astron, Chungli 32054, Taiwan
7.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China
Recommended Citation
GB/T 7714
Lin, WP,Zhou, X,Burstein, D,et al. H alpha plus [N II] observations of the HII regions in M81[J]. ASTRONOMICAL JOURNAL,2003,126(3):1286-1294.
APA Lin, WP.,Zhou, X.,Burstein, D.,Windhorst, RA.,Chen, JS.,...&Zhu, J.(2003).H alpha plus [N II] observations of the HII regions in M81.ASTRONOMICAL JOURNAL,126(3),1286-1294.
MLA Lin, WP,et al."H alpha plus [N II] observations of the HII regions in M81".ASTRONOMICAL JOURNAL 126.3(2003):1286-1294.
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