| Type |
Journal Article |
| Names |
L. L. Cowie, A. J. Barger, W.-H. Wang, J. P. Williams |
| Publication |
The Astrophysical Journal Letters |
| Volume |
697 |
| Issue |
2 |
| Pages |
L122-L126 |
| Date |
June 1, 2009 |
| Short Title |
An Accurate Position for HDF 850.1 |
| URL |
http://adsabs.harvard.edu/abs/2009ApJ...697L.122C |
| Library Catalog |
NASA ADS |
| Abstract |
We report a highly significant Submillimeter Array (SMA) detection of
the prototypical submillimeter source HDF 850.1, which is the brightest
submillimeter source in the Hubble Deep Field-North proper. The
detection yields an extremely precise position of R.A.(2000) =
12h36m51.s99 and Decl.(2000) =
+62°12'25farcs83 with a 1σ positional uncertainty of 0farcs17.
The position is consistent with the location of a millimeter wavelength
interferometric detection and with the locations of weak Very Large
Array detections at 1.4 and 8.4 GHz, but it is not consistent with any
previous optical/near-infrared identifications. The source appears
point-like at the 2'' resolution of the SMA, and the detected flux of
7.8 ± 1.0 mJy is consistent with the measured Submillimeter
Common-User Bolometer Array (SCUBA) fluxes. We tabulate fluxes and
limits on HDF 850.1 at other wavelengths. Our redshift estimate for HDF
850.1 based on the radio through mid-infrared measurements is z =
4.1+0.5 -0.6. The faintness of the source at
optical/near-infrared wavelengths and the high estimated redshift
suggest that HDF 850.1 may be an analog of the brighter submillimeter
source GOODS 850-5, which is also thought to be at z > 4. The fact
that a source like HDF 850.1 should have appeared in one of the very
first blank-field SCUBA observations ever made suggests that such
high-redshift sources are quite common. Thus, we are led to conclude
that high-redshift star formation is dominated by giant dusty
star-forming galaxies, just as it is at lower redshifts. |
| Tags |
GALAXIES: EVOLUTION, cosmology: observations, galaxies: formation, galaxies: starburst, infrared: galaxies |