Speaker
Description
The South Pole Telescope (SPT) is at the frontier of measuring the cosmic microwave background and surveying the millimeter sky. The third-generation SPT camera (SPT-3G) has observing frequencies centered at 90, 150, and 220 GHz (3.3, 2, and 1.4 mm) and arcminute resolution, enabling the study of millimeter-bright astrophysical objects. In this work, we present the static, emissive point source catalog from roughly 1,500 square degrees observed from 2019-2023 and associated source counts. We detected ~28,000 objects with signal-to-noise of at least five (> 5σ) in one or more bands, corresponding to 1.2, 1.4, and 4.6 mJy at 90, 150, and 220 GHz, respectively. This SPT-3G catalog is the largest and deepest source catalog in the millimeter bands to-date. Comparisons to external catalogs in radio, infrared, and millimeter frequencies leave ~14,000 SPT-3G sources (50% of the catalog) without counterparts at other wavelengths or in a previous millimeter survey. The spectral indices of the sources reveal two populations: flat- and falling-spectrum sources indicating synchrotron radiation from active galactic nuclei (AGN, ~12,000 sources) and rising-spectrum sources corresponding to thermal emission from dust-enshrouded galaxies (~16,000 sources). Our high-redshift dusty star-forming galaxy (DSFG) selection process results in ~4,000 candidates detected at > 5σ in both the 150 and 220 GHz bands. Prior small samples of SPT-selected dusty galaxies have a mean redshift of z~4; a sample of thousands of these objects from SPT-3G will enable exciting studies of early universe galaxy formation and evolution, and probes of high-redshift structure.
| Would you be interested in presenting a poster if the conference is oversubcribed? | Yes |
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