# Automated Mining of the ALMA Archive in the COSMOS Field (A3COSMOS): I. Robust ALMA Continuum Photometry Catalogs and Stellar Mass and Star Formation Properties for ~700 Galaxies at z=0.5-6

**Authors:** Daizhong Liu, P. Lang, B. Magnelli, E. Schinnerer, S. Leslie, Y. Fudamoto, M. Bondi, B. Groves, E. Jimenez-Andrade, K. Harrington, A. Karim, P. Oesch, M. Sargent, E. Vardoulaki, T. Badescu, L. Moser, F. Bertoldi, A. Battisti, E. da Cunha, J. Zavala  
**arXiv:** [1910.12872](https://arxiv.org/abs/1910.12872)  
**Date:** 2019-10-28  
**Summary page:** https://www.summarizepaper.com/en/paper/1910.12872v1/

## Key points

- The ALMA archive contains information on (sub)millimeter dust continuum emission from distant galaxies
- The data is inhomogeneous and difficult to use for studies of galaxy evolution
- Researchers have developed automated mining pipelines for the ALMA archive in the COSMOS field (A3COSMOS)
- These pipelines exploit available information for large numbers of galaxies across cosmic time and keep data products in sync with the increasing public ALMA archive
- The pipelines include a dedicated ALMA continuum imaging pipeline, two complementary photometry pipelines for blind source extraction and prior source fitting, a counterpart association pipeline utilizing multiwavelength data, an assessment of potential (sub)millimeter line contribution to measured ALMA continuum, and extensive simulations to provide statistical corrections to biases and uncertainties in ALMA continuum measurements
- Application of these tools yields photometry catalogs with approximately 1000 (sub)millimeter detections from over 1500 individual ALMA continuum images
- Researchers provide robust information on redshift, stellar mass, and star formation rate for approximately 700 galaxies at redshifts 0.5-6 in the COSMOS field
- The resulting ALMA photometric measurements and galaxy properties are released publicly within blind extraction, prior fitting, and galaxy property catalogs along with images
- These products will be updated regularly in the future to ensure ongoing access to valuable insights into galaxy evolution by making previously difficult-to-use data more accessible to researchers studying distant galaxies.

## Summary

The Atacama Large Millimeter/submillimeter Array (ALMA) archive contains a wealth of information on (sub)millimeter dust continuum emission from distant galaxies. However, the data is inhomogeneous and difficult to use for studies of galaxy evolution. To address this issue, researchers have developed automated mining pipelines for the ALMA archive in the COSMOS field (A3COSMOS). These pipelines exploit available information for large numbers of galaxies across cosmic time and keep data products in sync with the increasing public ALMA archive. The pipelines include a dedicated ALMA continuum imaging pipeline, two complementary photometry pipelines for blind source extraction and prior source fitting, a counterpart association pipeline utilizing multiwavelength data, an assessment of potential (sub)millimeter line contribution to measured ALMA continuum, and extensive simulations to provide statistical corrections to biases and uncertainties in ALMA continuum measurements. Application of these tools yields photometry catalogs with approximately 1000 (sub)millimeter detections from over 1500 individual ALMA continuum images. Combined with ancillary photometric and redshift catalogs and quality assessments based on machine-learning techniques, researchers provide robust information on redshift, stellar mass, and star formation rate for approximately 700 galaxies at redshifts 0.5-6 in the COSMOS field. The resulting ALMA photometric measurements and galaxy properties are released publicly within blind extraction, prior fitting, and galaxy property catalogs along with images. These products will be updated regularly in the future to ensure ongoing access to valuable insights into galaxy evolution by making previously difficult-to-use data more accessible to researchers studying distant galaxies.