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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(STIS) onboard the Hubble Space Telescope. The full WFPC2 deep field has beenobserved at 1600 Angstroms. We detect 134 galaxies and one star down to a limitof 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 byGALEX, which we attribute at least in part to cosmic variance in the smallHDF-N field of view. Six of the 13 Chandra sources at z<0.85 in the HDF-N aredetected in the FUV, and those are consistent with starbursts rather than AGN.Cross-correlating with Spitzer sources in the field, we find that the FUVdetections show general agreement with the expected L_IR/L_UV vs. Betarelationship. We infer star formation rates (SFRs), corrected for extinctionusing the UV slope, and find a median value of 0.3 Msun/yr for FUV-detectedgalaxies, with 75% of detected sources have SFR<1 Msun/yr. Examining themorphological distribution of sources, we find that about half of allFUV-detected sources are identied as spiral galaxies. Half ofmorphologically-selected spheroids at z<0.85 are detected in the FUV,suggesting that such sources have significant ongoing star-formation in theepoch since z=1.

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