Astronomy Department

AzTEC on the JCMT

Following a successful two week long engineering run at the JCMT in July 2005, the AzTEC camera conducted a two-month long series of 1100um surveys of blank and mass-biased regions of the sky. A total of 16 AzTEC visiting instrument programs were approved by the JCMT time allocation groups, and these AzTEC observations were scheduled for the months of November and December 2005. The SMG surveys, described below, utilized about 350 hours of telescope time at the JCMT and nearly quadrupled all previous surveys at mm/sub-mm surveys in depth-weighted area

AzTEC/SHADES (P.I. J.Dunlop)

The AzTEC/SHADES survey is the AzTEC analog to the SCUBA Half Degree Extragalactic Survey (see Coppin et al. 2006 and references therein), a large-area SMG survey which was slightly less than half-complete when the SCUBA instrument was decommissioned in 2005. With AzTEC we managed to complete the survey, including re-imaging the pair of SCUBA fields (one centered on the Lockman Hole and the other centered on the Subaru Deep Field South). As a result, we have produced the largest set of continguous areas mapped at both 1.1mm and 850um wavelengths. Many new submillimeter galaxies have been identified in the AzTEC maps and the SHADES collaboration has begun work on the interpreation of the results. The data set is rich; the sheer size of the survey along with the extensive multi-wavelength data available give us the ability to do a systematic study of mm/submm spectral indices, the relationship between SMGs and radio/MIPS sources, clustering of the SMG population, photometric redshift techniques, estimated stellar masses, morphologies and SF histories. Most importantly, the large/deep survey allows us to calculate the most precise measurement of the SMG number density as a function of flux ever measured.

AzTEC/GOODS-N (P.I. E. Chapin)

The AzTEC/GOODS-N survey covers the area of deep HST/ACS and Spitzer imaging in the Chandra Deep Field North. Though smaller in area than the SHADES survey, this survey area is unique in terms of the extensive multi-wavelength complementary data available. The AzTEC survey has yielded many highly robust sources (We can't say here until the paper comes out.). In most cases spectroscopic redshifts have been obtained for the most probable counterparts, giving us a unique view at the redshift distribution of the SMG population in the field.

AzTEC/COSMOS (P.I. D. Sanders)

The AzTEC/COSMOS survey is centered on a massive galaxy cluster at z=0.73. This survey has resulted in the identification of an unusually large number of bright (S{1.1mm}>= 5~mJy) SMGs (Scott et al. 2008) with a spatial distribution highly correlated to the projected galaxy density along the line of sight (Austermann et al. 2009). Fifteen of the 50 AzTEC sources from this survey have been followed-up and detected by the Submillimeter array with 2arcsec resolution (see Younger et al. 2007,2009), confirming that these sources are individual galaxies and not pairs of blended sources. Detailed description of the survey and the source catalog are given by Scott et al. (2009).

4c41.17 and MS0451

In addition to the above surveys, we imaged the high-z radio galaxy 4c41.17 and the z=0.5 cluster MS0451. Both fields show evidence for an overdensity of SMGs as in the AzTEC/COSMOS survey, and this has motivated our largest key project for the AzTEC/ASTE set of surveys.