# ALMA photometry of extragalactic radio sources

## TL;DR

This paper presents a comprehensive ALMA radio source catalog, validating Planck data, assessing positional accuracy, and extrapolating source counts at high frequencies, providing valuable insights into extragalactic radio sources.

## Contribution

The study offers the first extensive ALMA catalog of bright radio sources, validating Planck photometry, and extrapolating source counts at high frequencies with model comparisons.

## Key findings

- ALMA catalog includes 3,364 sources with 47,115 observations.
- Validated Planck catalog photometry and positional accuracy.
- Extrapolated radio source counts align with the Tucci et al. C2Ex model.

## Abstract

We present a new catalogue of ALMA observations of 3,364 bright, compact radio sources, mostly blazars, used as calibrators. These sources were observed between May 2011 and July 2018, for a total of 47,115 pointings in different bands and epochs. We have exploited the ALMA data to validate the photometry given in the new Planck Multi-frequency Catalogue of Non-thermal sources (PCNT), for which an external validation was not possible so far. We have also assessed the positional accuracy of Planck catalogues and the PCNT completeness limits, finding them to be consistent with those of the Second Planck Catalogue of Compact Sources. The ALMA continuum spectra have allowed us to extrapolate the observed radio source counts at 100 GHz to the effective frequencies of ALMA bands 4, 6, 7, 8 and 9 (145, 233, 285, 467 and 673 GHz, respectively), where direct measurements are scanty, especially at the 3 highest frequencies. The results agree with the predictions of the Tucci et al. model C2Ex, while the model C2Co is disfavoured.