Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-07-14
Astrophys.J. 559 (2001) 606
Astronomy and Astrophysics
Astrophysics
accepted by AJ, abstract truncated, high resolution PS version of the plate available from the authors
Scientific paper
10.1086/322349
The 15R-North galaxy redshift survey is a uniform spectroscopic survey (S/N $\sim $10) covering the range 3650---7400\AA 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$\beta$, O[III], H$\alpha$, and [N\II] to discriminate between star-forming galaxies and AGNs. We use the EW(H$\alpha$ + [N\II]) 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.
Carter B. J.
Fabricant Dan G.
Geller Margaret J.
Kurtz Michael J.
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