Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915402m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #154.02
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results of a spectral index analysis of data collected by the Atacama Cosmology Telescope (ACT) corresponding to locations of radio-selected galaxies detected by the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey. The ACT data is from 148 GHz and 218 GHz observations of an equatorial region overlapping with the Sloan Digital Sky Survey Stripe 82. By binning FIRST sources according to flux, we calculate the ACT flux estimation of each bin using a stacking algorithm. We see a steepening of spectral index between FIRST and ACT frequencies as a function of flux. Also, we do not detect any significant deviation of ACT stacked data when the FIRST sample is limited to galaxies near optically-selected galaxy clusters. Fitting the ACT stacked data at FIRST radio source locations to a power law and using evolution models of active galactic nuclei (AGN) and dusty star forming galaxies (DSFGs) as a function of flux at 1.4 GHz, we estimate an AGN and DSFG spectral index between 148 GHz and 218 GHz.
Marriage Tobias
Mo Wenli
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