Computer Science
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phdt.........5l&link_type=abstract
PhD Thesis,Proquest Dissertations And Theses 2006. Section 0051, Part 0606 199 pages; [Ph.D. dissertation].United States -- Colo
Computer Science
2
Lockman Hole, Millimeter-Wave, Galaxy Survey, Bolocam
Scientific paper
This work presents results of a new deep (s 1.1mm ~= 1.4 mJy beam -1 ) 1.1 mm submillimeter galaxy survey using Bolocam, a millimeter-wavelength bolometer array camera designed for mapping large fields at fast scan rates, without chopping. A map, galaxy candidate list, and derived number counts are presented. The data were reduced using a custom software pipeline to remove correlated sky and instrument noise via a principal component analysis. Extensive simulations and jackknife tests were performed to confirm the robustness of our source candidates and estimate the effects of false detections, bias, and completeness. In total, 17 source candidates were detected at a significance > 3.0 s, with six expected false detections. From both our observed number counts and a fluctuation analysis, we estimate the underlying differential number count distribution of submillimeter galaxies and find it to be in general agreement with previous surveys.
This work also presents 350 mm photometry of all 17 galaxy candidates detected in the Lockman Hole survey. Nine of the Bolocam galaxy candidates were detected at 350 mm and two new candidates were serendipitously detected at 350 mm (bringing the total in the literature detected in this way to three). Five of the galaxies have published spectroscopic redshifts, enabling investigation of the implied temperature ranges and a comparison of photometric redshift techniques. Because l = 350 mm lies near the spectral energy distribution peak for z [approximate] 2.5 thermally emitting galaxies, luminosities can be measured without extrapolating to the peak from detection wavelengths of l >= 850 mm. Characteristically, the galaxy luminosities lie in the range 1.0--1.2 × 10 13 [Special characters omitted.] , with dust temperatures in the range of 40 K to 70 K, depending on the choice of spectral index and wavelength of unit optical depth. The implied dust masses are 3--5 × 10 8 [Special characters omitted.] . We find that the far-infrared to radio relation for star-forming ULIRGs systematically overpredicts the radio luminosities and overestimates redshifts on the order of D z [approximate] 1, whereas redshifts based on either on submillimeter data alone or the 1.6 mm stellar bump and PAH features are more accurate.
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