Radio Observations of the Cosmic Evolution of Black Hole and Stellar Mass Growth in Galaxies
Final Report Abstract
The goal of the Bonn side of our project was to characterize the active galactic nuclei (AGN) population in the 3GHz VLA-COSMOS Large Project data, and in particular, AGN that display jets and lobes in their radio structure. We used a broad range of radio and supplemental data, and helped in the development of data analysis tools to develop new methods to study the evolution of galaxies and AGN. The focus of DFG-funded postdoc Eleni Vardoulaki’s work has been on radio AGN, their energetics, radio structure, and the effect of environment on their radio emission structure. Using the novel COSMOS radio data, she also leads work on the infrared/radio relation at low and high redshift in relation to environment, and on the morphology of extended radio sources, for which she collaborates with members of the Bonn group, as well as with our COSMOS project colleagues at Heidelberg, Zagreb, and Sussex. She also worked with colleagues at Oxford on peculiar sources in the COSMOS field, and with Bonn master student Vishnu Balakrishnan she studied the energetics of these sources using spatially resolved radio spectral index maps. She also contributed to a study on the escape of Lyman continuum radiation from radio galaxies in the COSMOS field, and the resulting impact of the environment. Our team also contributed to the COSMOS effort to explore the effects of AGN on X-ray galaxy groups, and to the study of AGN within X-ray groups that show radio/X-ray emission coincidence. As a future-oriented methodological development, we explored machine learning algorithms to systematically study the radio structure of spatially complex, extended radio sources. With Bonn PhD students we investigated how to automatically classify radio sources based on their radio structure, and how to best apply machine learning algorithms for this. This approach is very timely given the large, upcoming radio surveys with MeerKAT and eventually SKA, and the challenge to analyze these data. The work on this project continues. DFG-funded Heidelberg PhD student Ms. Sarah Leslie works on dust attenuation in galaxies and applies this to benchmark commonly used SFR calibrations. She found surprising results on the 3D dust distribution, on the similar cosmic evolution of the dust mass and gas mass, and on trends in UV attenuation for high- and low-mass galaxies. Her in-depth investigation of the SFR-stellar mass relation over cosmic time is one of the most comprehensive ones yet. It reveals inconsistencies that are due to our incomplete understanding of the underlying physical cause of infrared-radio correlation, and of the stellar mass function over cosmic time. Together with Dr. Molnar, Ms. Leslie compiled the largest sample of local galaxies with good infrared and radio measurements, using SDSS as the parent sample. This sample is currently being used to obtain a better understanding of potential biases and inherent trends in previous studies of the local infrared-radio relation. This is very important work to provide a better calibration and physical insights for the use of this relation for high-redshift SFR studies. Ms. Leslie successfully proposed for and obtained ALMA CO line observations for a few z~0.3 IR- luminous galaxies to study the resolved Kennicutt-Schmidt relation. Due to time constraints, the analysis of these data will happen after the DFG funding ended. She has also provided some help during the build-up of the ALMA archive mining project that is led by postdocs at the University of Bonn and MPIA/Heidelberg based on her expertise and skills.
Publications
- 2018, A&A, 615, A7, Probing star formation and ISM properties using galaxy disk inclination. I. Evolution in disk opacity since z 0.7
Leslie, Sargent, Schinnerer et al.
(See online at https://doi.org/10.1051/0004-6361/201732255) - 2018, A&A, 618L, 8: Linear radio size evolution of μJy populations
Bondi, Zamorani, Ciliegi et al.
(See online at https://doi.org/10.1051/0004-6361/201834243) - 2018, A&A, 620A, 192: The VLA-COSMOS 3 GHz Large Project: Star formation properties and radio luminosity functions of AGN with moderate-to-high radiative luminosities out to z~6
Ceraj, Smolčić, Delvecchio et al.
(See online at https://doi.org/10.1051/0004-6361/201833935) - 2018, MNRAS, 475, 827: The infrared-radio correlation of spheroid- and disc-dominated star-forming galaxies to z ˜ 1.5 in the COSMOS field
Molnár, Sargent, Delhaize et al.
(See online at https://doi.org/10.1093/mnras/stx3234) - Probing star formation and ISM properties using galaxy disk inclination. II. Testing typical FUV attenuation corrections out to z ~ 0.7
Leslie, Schinnerer, et al.
(See online at https://doi.org/10.1051/0004-6361/201833114) - 2019, A&A, 621A, 139: The VLA-COSMOS 3 GHz Large Project: Average radio spectral energy distribution of highly star-forming galaxies
Tisanić, Smolčić, Delhaize, et al.
(See online at https://doi.org/10.1051/0004-6361/201834002) - 2019, A&A, 625A: 114 Radio continuum size evolution of star-forming galaxies over 0.35 < z < 2.25
Jiménez-Andrade, Magnelli, Karim, et al.
(See online at https://doi.org/10.1051/0004-6361/201935178) - 2019, A&A: A closer look at the deep radio sky: Multi-component radio sources at 3-GHz VLA-COSMOS
Vardoulaki, Jiménez Andrade, Karim et al.
(See online at https://doi.org/10.1051/0004-6361/201832982) - 2019, ApJ, 879, 54: Revealing the Stellar Mass and Dust Distributions of Submillimeter Galaxies at Redshift 2
Lang, Schinnerer, Smail, et al.
(See online at https://doi.org/10.3847/1538-4357/ab1f77)
