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19 April 2024 |
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Star Formation in a Complete Spectroscopic Survey of Galaxies | | B. J. Carter
; D. G. Fabricant
; M. J. Geller
; M. J. Kurtz
; | | Date: |
14 Jul 2001 | | Journal: | Astrophys.J. 559 (2001) 606 | | Subject: | astro-ph | | Abstract: | The 15R-North galaxy redshift survey is a uniform spectroscopic survey (S/N $sim $10) covering the range 3650---7400AA for 3149 galaxies with median redshift 0.05. The sample is 90% complete to $R=15.4$. The median slit covering fraction is 24% of the galaxy, apparently sufficient to minimize the effects of aperture bias on the EW(H$alpha$). Forty-nine percent of the galaxes in the survey have one or more emission lines detected at $geq 2 sigma$. In agreement with previous surveys, the fraction of absorption-line galaxies increases steeply with galaxy luminosity. We use H$eta$, O[III], H$alpha$, and [NII] to discriminate between star-forming galaxies and AGNs. We use the EW(H$alpha$ + [NII]) to estimate the Scalo birthrate parameter, $b$, the ratio of the current star formation rate to the time averaged star formation rate. Finally, we examine the way galaxies of different spectroscopic type trace the large-scale galaxy distribution. | | Source: | arXiv, astro-ph/0107258 | | Services: | Forum | Review | PDF | Favorites | |
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