Far-Ultraviolet Imaging of the Hubble Deep Field-North: Star Formation in Normal Galaxies at z<1

August 2006 • 2006AJ....132..853T

Authors • Teplitz, H. I. • Siana, B. • Brown, T. M. • Chary, R. • Colbert, J. W. • Conselice, C. J. • de Mello, D. F. • Dickinson, M. • Ferguson, H. C. • Gardner, Jonathan P. • Menanteau, F.

Abstract • We present far-ultraviolet (FUV) imaging of the Hubble Deep Field-North (HDF-N) taken with the Solar Blind Channel of the Advanced Camera for Surveys (ACS SBC) and the FUV MAMA detector of the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope. The full WFPC2 deep field has been observed at 1600 Å. We detect 134 galaxies and one star down to a limit of FUV_AB~29. All sources have counterparts in the WFPC2 image. Redshifts (spectroscopic or photometric) for the detected sources are in the range 0<z<1. We find that the FUV galaxy number counts are higher than those reported by GALEX, which we attribute at least in part to cosmic variance in the small HDF-N field of view. Six of the 13 Chandra sources at z<0.85 in the HDF-N are detected in the FUV, and those are consistent with starbursts rather than active galactic nuclei. Cross-correlating with Spitzer sources in the field, we find that the FUV detections show general agreement with the expected L_IR/L_UV versus β relationship. We infer star formation rates (SFRs), corrected for extinction using the UV slope, and find a median value of 0.3 M_solar yr^-1 for FUV-detected galaxies, with 75% of detected sources having SFR<1 M_solar yr^-1. Examining the morphological distribution of sources, we find that about half of all FUV-detected sources are identified as spiral galaxies. Half of morphologically selected spheroid galaxies at z<0.85 are detected in the FUV, suggesting that such sources have had significant ongoing star formation in the epoch since z~1.

Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555. These observations are associated with proposals 7410 and 9478.

Links

• PREPRINT http://arxiv.org/abs/astro-ph/0606244
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/2006AJ....132..853T
• ELECTR https://doi.org/10.1086%2F505685
• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2006AJ....132..853T
• PDF https://stacks.iop.org/1538-3881/132/853/pdf
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• DATA https://hst.esac.esa.int/ehst/#/pages/search;bibcode=2006AJ....132..853T
• DATA https://irsa.ipac.caltech.edu/bibdata/2006/T/2006AJ....132..853T.html
• SPIRES http://inspirehep.net/search?p=find+eprint+astro-ph/0606244