The Galaxy Luminosity Function at z~1 in the HUDF: Probing the Dwarf Population
Abstract
We present a catalog of spectro-photometric redshifts for 1308 galaxies from the GRism ACS Program for Extragalactic Science (GRAPES) observations with the Hubble Space Telescope. These low-resolution spectra between 6000 A and 9500 A are supplemented with U, J, H, and Ks from various facilities, resulting in redshifts computed with ~40 spectral bins per galaxy. For 81 galaxies between 0.5<z<1.5 with spectroscopic redshifts, the standard deviation in the fractional error in (1+z) is 0.046. With this catalog, we compute the B-band luminosity function in this redshift range from 72 galaxies. Owing to the depth of the GRAPES survey, we are able to accurately constrain the faint-end slope by going to M_B~-18 mag at 0.8<z<1.2, nearly two magnitudes fainter than previous studies. The faint-end slope is alpha=-1.32+-0.07. When compared to numerous published values at various redshifts, we find strong evidence for a steepening of the faint-end slope with redshift which is expected in the hierarchical formation scenario of galaxies.
Cite
@article{arxiv.astro-ph/0703743,
title = {The Galaxy Luminosity Function at z~1 in the HUDF: Probing the Dwarf Population},
author = {R. E. Ryan and N. P. Hathi and S. H. Cohen and S. Malhotra and J. Rhoads and R. A. Windhorst and T. Budavári and N. Pirzkal and C. Xu and N. Panagia and L. Moustakas and S. di Serego Alighieri and H. Yan},
journal= {arXiv preprint arXiv:astro-ph/0703743},
year = {2016}
}
Comments
Includes emulateapj.cls, 6 pages, 6 figures (1 color), 3 tables. Accepted for publication to ApJ