Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Far-Ultraviolet Imaging of the Hubble Deep Field North: Star Formation
  in Normal Galaxies at z<1   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 been
observed at 1600 Angstroms. 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 AGN.
Cross-correlating with Spitzer sources in the field, we find that the FUV
detections show general agreement with the expected L_IR/L_UV vs. Beta
relationship. We infer star formation rates (SFRs), corrected for extinction
using the UV slope, and find a median value of 0.3 Msun/yr for FUV-detected
galaxies, with 75% of detected sources have SFR<1 Msun/yr. Examining the
morphological distribution of sources, we find that about half of all
FUV-detected sources are identied as spiral galaxies. Half of
morphologically-selected spheroids at z<0.85 are detected in the FUV,
suggesting that such sources have significant ongoing star-formation in the
epoch since z=1.

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The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: q-bio