TY - JOUR
T1 - Atacama cosmology telescope
T2 - Dusty star-forming galaxies and active galactic nuclei in the equatorial survey
AU - Gralla, Megan B.
AU - Marriage, Tobias A.
AU - Addison, Graeme
AU - Baker, Andrew J.
AU - Bond, J. Richard
AU - Crichton, Devin
AU - Datta, Rahul
AU - Devlin, Mark J.
AU - Dunkley, Joanna
AU - Dünner, Rolando
AU - Fowler, Joseph
AU - Gallardo, Patricio A.
AU - Hall, Kirsten
AU - Halpern, Mark
AU - Hasselfield, Matthew
AU - Hilton, Matt
AU - Hincks, Adam D.
AU - Huffenberger, Kevin M.
AU - Hughes, John P.
AU - Kosowsky, Arthur
AU - López-Caraballo, Carlos H.
AU - Louis, Thibaut
AU - Marsden, Danica
AU - Moodley, Kavilan
AU - Niemack, Michael D.
AU - Page, Lyman A.
AU - Partridge, Bruce
AU - Rivera, Jesus
AU - Sievers, Jonathan L.
AU - Staggs, Suzanne
AU - Su, Ting
AU - Swetz, Daniel
AU - Wollack, Edward J.
N1 - Funding Information:
This work was supported by the U.S. National Science Foundation through awards AST-0408698
Publisher Copyright:
© 2020. The American Astronomical Society. All rights reserved
PY - 2020/4/20
Y1 - 2020/4/20
N2 - We present a catalog of 510 radio-loud active galactic nuclei (AGNs, primarily blazars) and 287 dusty star-forming galaxies (DSFGs) detected by the Atacama Cosmology Telescope at >5σ significance in frequency bands centered on 148 GHz (2 mm), 218 GHz (1.4 mm), and 277 GHz (1.1 mm), from a 480 deg2 strip centered at R.A. 00h on the celestial equator with additional 360 deg2 shallower auxiliary fields at other longitudes. The combination of the deepest available 218 GHz wide-field imaging, our 277 GHz data, and multiband filtering results in the most sensitive wide-field millimeter-wave DSFG selection to date, with rms noise level referenced to 218 GHz reaching below 2 mJy. We have developed new techniques to remove Galactic contamination (including evidence for CO (2-1) line emission) from the extragalactic catalog, yielding a catalog of 321 Galactic sources in addition to the extragalactic catalog. We employ a new flux debiasing method that accounts for the heterogeneous sample selection in the presence of Galactic cuts. We present the spectral properties and source counts of the AGNs and DSFGs. The DSFG spectra depart from the Rayleigh-Jeans regime of an optically thin modified blackbody between 218 and 277 GHz, consistent with optically thick emission or an additional cold dust component. For AGNs with 148 and 218 GHz flux density >50 mJy, we estimate the interyear rms fractional deviation in flux density due to source variability to be 40% with a 0.98 interband correlation coefficient. We provide source counts for AGNs in the range of 8-2870 mJy and for DSFGs in the range of 8-90 mJy. Our DSFG counts probe both the brighter, lensed population and the fainter, unlensed population. At 277 GHz we report the first measurements of source counts at these flux densities, finding an excess above most model count predictions. Finally, we present 30 of the brightest DSFGs that were selected for multifrequency study as candidate high-z lensed systems.
AB - We present a catalog of 510 radio-loud active galactic nuclei (AGNs, primarily blazars) and 287 dusty star-forming galaxies (DSFGs) detected by the Atacama Cosmology Telescope at >5σ significance in frequency bands centered on 148 GHz (2 mm), 218 GHz (1.4 mm), and 277 GHz (1.1 mm), from a 480 deg2 strip centered at R.A. 00h on the celestial equator with additional 360 deg2 shallower auxiliary fields at other longitudes. The combination of the deepest available 218 GHz wide-field imaging, our 277 GHz data, and multiband filtering results in the most sensitive wide-field millimeter-wave DSFG selection to date, with rms noise level referenced to 218 GHz reaching below 2 mJy. We have developed new techniques to remove Galactic contamination (including evidence for CO (2-1) line emission) from the extragalactic catalog, yielding a catalog of 321 Galactic sources in addition to the extragalactic catalog. We employ a new flux debiasing method that accounts for the heterogeneous sample selection in the presence of Galactic cuts. We present the spectral properties and source counts of the AGNs and DSFGs. The DSFG spectra depart from the Rayleigh-Jeans regime of an optically thin modified blackbody between 218 and 277 GHz, consistent with optically thick emission or an additional cold dust component. For AGNs with 148 and 218 GHz flux density >50 mJy, we estimate the interyear rms fractional deviation in flux density due to source variability to be 40% with a 0.98 interband correlation coefficient. We provide source counts for AGNs in the range of 8-2870 mJy and for DSFGs in the range of 8-90 mJy. Our DSFG counts probe both the brighter, lensed population and the fainter, unlensed population. At 277 GHz we report the first measurements of source counts at these flux densities, finding an excess above most model count predictions. Finally, we present 30 of the brightest DSFGs that were selected for multifrequency study as candidate high-z lensed systems.
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U2 - 10.3847/1538-4357/ab7915
DO - 10.3847/1538-4357/ab7915
M3 - Review article
AN - SCOPUS:85085131212
SN - 0004-637X
VL - 893
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 104
ER -