z ~ 2.5 - 3 Ionizers in the GOODS-N Field

Abstract

We use deep F275W imaging from the $Hubble$ Deep UV Legacy Survey (HDUV) and G280 grism spectroscopy from $HST$/WFC3, along with new and archival optical spectra from Keck/DEIMOS, to search for candidate ionizing sources in the GOODS-N field at z ~ 2.5 - 3. Spectroscopic identification of our UV-selected sources are 99% complete to F275W = 25.5 in the region of the UV imaging, and we identify 6 potential ionizing galaxies or AGNs at z ~ 3. By far the brightest of these is a z = 2.583 AGN that totally dominates the ionizing flux in the region, with a specific ionizing volume emissivity at $912\mathring{A}$ of ${\epsilon }_{912}$ = $8.3_{1.4}^{27}\times 10^{24}$ erg s${}^{-1}$ Hz${}^{-1}$ Mpc${}^{-3}$. Based on our spectroscopic data, we find four candidates are contaminated by foreground galaxies at z ~ 0.5 - 0.7. At ${\epsilon }_{912}$ = $2.2_{0.4}^{7.2}\times 10^{23}$ erg s${}^{-1}$ Hz${}^{-1}$ Mpc${}^{-3}$, the remaining candidate galaxy's contribution to the ionizing background lies well below the flux required to ionize the intergalactic medium at z ~ 2.5 - 3, consistent with previous observations that show AGNs provide the bulk of the ionizing background at these redshifts.

arXiv comment14 pages, 11 figures. Accepted for publication in ApJ

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