NICMOS imaging of the dusty microjansky radio source VLA J123642+621331 at z = 4.424

I. Waddington, R. A. Windhorst, S. H. Cohen, R. B. Partridge, H. Spinrad, D. Stern

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We present the discovery of a radio galaxy at a likely redshift of z = 4.424 in one of the flanking fields of the Hubble Deep Field (HDF). Radio observations with the Very Large Array and MERLIN centered on the HDF yielded a complete sample of microjansky radio sources, of which about 20% have no optical counterpart to I≤25 mag. In this Letter, we address the possible nature of one of these sources through deep Hubble Space Telescope near-infrared camera and multiobject spectrometer (NICMOS) images in the F110W (J110) and F160W (H160) filters. VLA J123642+621331 has a single emission line at 6595 Å, which we identify with Lyα at z = 4.424. We argue that this faint (H160 = 23.9 mag), compact (re≃0″.2), red (I214-K = 2.0) object is most likely a dusty, star-forming galaxy with an embedded active nucleus.

Original languageEnglish (US)
Pages (from-to)L77-L80
JournalAstrophysical Journal
Issue number2 PART 2
StatePublished - Dec 1 1999


  • Galaxies: active
  • Galaxies: evolution
  • Galaxies: starburst

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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