Deep 2 micron imaging of the sky - Evidence for a new extragalactic population

Details Deep 2 micron imaging of the sky - Evidence for a new extragalactic population Deep 2 micron imaging of the sky - Evidence for a new extragalactic population

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331l..77e&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 331, Aug. 15, 1988, p. L77-L80. NASA-NSF-supported research.

Astronomy and Astrophysics

Astronomy

151

Astronomical Photography, Faint Objects, Galactic Evolution, Infrared Imagery, Infrared Sources (Astronomy), Astronomical Models, Background Radiation, Color-Magnitude Diagram, Red Shift

Scientific paper

The authors have obtained the first deep images of high Galactic latitude sky at 2 μm. These images reach a 1 σ detection limit of 21.9 mag arcsec-2 at K, about 1/20,000 of the sky level. A total of 10 arcmin2 of the sky was imaged. Of particular interest are two extended objects with K magnitudes of about 17 and R-K colors of about 5. These objects occupy a region of the color-magnitude diagram that is separate from the locus of normal galaxies and should not be occupied by large numbers of normal galaxies at any redshift. The authors suggest that these may be high-redshift galaxies (z > 6) which are in a luminous star-forming phase.

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