ACT Data Products - Equatorial Extragalactic Source Catalog

Description

This is a catalog of extragalactic sources detected by the Atacama Cosmology Telescope at 148, 218, and 277 GHz along the celestial equator. Flux density calibration uncertainties for unresolved sources at 148, 218, and 277 GHz are 3%, 5%, and 15%, respectively. For full information see Gralla et al (2019), “Atacama Cosmology Telescope: Dusty star-forming galaxies and active galactic nuclei in the equatorial survey”.

The file act_equatorial_extragalactic_gralla_v1_1.txt is the catalog associated with the submission and initial arXiv version of this work. There may be an updated version with final publication. The file is a human/machine-readable fixed width ASCII table. The table can be read into Python using the astropy.table.Table object with the following command:

catalog = Table.read('act_equatorial_extragalactic_gralla_v1_1.txt', format='ascii.fixed_width').

The columns contain the following information:

Column Name Description
Name Name of the source
ra J2000 right ascension in degrees
dec J2000 declination in degrees
S/N Signal-to-noise ratio of the detection in the selection band
selection The selection dataset encoded as: 1 = 148 GHz, 2 = 218 GHz, MMF = DSFG multifrequency matched filter
alpha_12_raw Raw 148-218 GHz  spectral index
alpha_12_db_minus Debiased 148-218 GHz spectral index, 16% quantile
alpha_12_db Debiased 148-218 GHz spectral index, 50% quantile
alpha_12_db_plus Debiased 148-218 GHz spectral index, 84% quantile
alpha_23_raw Raw 218-277 GHz spectral index
alpha_23_db_minus Debiased 218-277 GHz spectral index, 16% quantile
alpha_23_db Debiased 218-277 GHz spectral index, 50% quantile
alpha_23_db_plus Debiased 218-277 GHz spectral index, 84% quantile
type AGN (alpha_12_raw < 1) or DSFG (alpha_12_raw > 1)
S1_raw Raw 148 GHz flux density  (Jy)
E1_raw Raw 148 GHz flux density error  (Jy)
S1_db_minus Debiased 148 GHz flux density, 16% quantile  (Jy)
S1_db Debiased 148 GHz flux density, 50% quantile  (Jy)
S1_db_plus Debiased 148 GHz flux density, 84% quantile  (Jy)
S2_raw Raw 218 GHz flux density  (Jy)
E2_raw Raw 218 GHz flux density error  (Jy)
S2_db_minus Debiased 218 GHz flux density, 16% quantile  (Jy)
S2_db Debiased 218 GHz flux density, 50% quantile  (Jy)
S2_db_plus Debiased 218 GHz flux density, 84% quantile  (Jy)
S3_raw Raw 277 GHz flux density  (Jy)
E3_raw Raw 277 GHz flux density error  (Jy)
S3_db_minus Debiased 277 GHz flux density, 50% quantile  (Jy)
S3_db_plus Debiased 277 GHz flux density, 84% quantile  (Jy)
S1_09 Raw 148 GHz flux density in 2009  (Jy)
E1_09 Raw 148 GHz flux density error in 2009  (Jy)
S1_10 Raw 148 GHz flux density in 2010  (Jy)
E1_10 Raw 148 GHz flux density error in 2010  (Jy)
S2_09 Raw 218 GHz flux density in 2009  (Jy)
E2_09 Raw 218 GHz flux density error in 2009  (Jy)
S2_10 Raw 218 GHz flux density in 2010  (Jy)
E2_10 Raw 218 GHz flux density error in 2010  (Jy)
extended_index Extended source indicator
extended_percentile Percentile of Extended index with respect to index of known point sources
neighbors Number of detections within a 0.5 degree radius of source 
neighbors_percentile Percentile of neighbors with respect to neighbors of randomly located positions

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