28 -- 40 GHz variability and polarimetry of bright compact sources in the QUIJOTE cosmological fields
| Autor: | Anne Lähteenmäki, Y. C. Perrott, Anthony Lasenby, Ricardo Genova-Santos, Merja Tornikoski, M. López-Caniego, Frédérick Poidevin, Jose Alberto Rubino-Martin, Mark Ashdown, D. Herranz, Carlos H. López-Caraballo |
|---|---|
| Přispěvatelé: | Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Trinity College Dublin, Victoria University of Wellington, European Space Agency - ESA, Instituto de Astrofísica de Canarias, University of Cambridge, Universidad de Cantabria, Department of Electronics and Nanoengineering, Metsähovi Radio Observatory, Aalto-yliopisto, Aalto University |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) general [quasars] 010308 nuclear & particles physics Cosmology: observations Polarimetry Cosmic background radiation Astronomy FOS: Physical sciences Astronomy and Astrophysics cosmic background radiation Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies 7. Clean energy 01 natural sciences observations [cosmology] Quasars: general Radio continuum: general Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences general [radio continuum] 010303 astronomy & astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| DOI: | 10.48550/arxiv.2102.04520 |
| Popis: | We observed 51 sources in the Q-U-I JOint TEnerife (QUIJOTE) cosmological fields that were brighter than 1 Jy at 30 GHz in the Planck Point Source Catalogue (version 1), with the Very Large Array at 28–40 GHz, in order to characterize their high-radio-frequency variability and polarization properties. We find a roughly lognormal distribution of polarization fractions with a median of 2 per cent, in agreement with previous studies, and a median rotation measure (RM) of ≈1110 rad m−2 with one outlier up to ≈64 000 rad m−2, which is among the highest RMs measured in quasar cores. We find hints of a correlation between the total intensity flux density and median polarization fraction. We find 59 per cent of sources are variable in total intensity, and 100 per cent in polarization at 3σ level, with no apparent correlation between total intensity variability and polarization variability. This indicates that it will be difficult to model these sources without simultaneous polarimetric monitoring observations and they will need to be masked for cosmological analysis. Partial financial support is provided by the Spanish Ministry of Science, Innovation and Universities under the projects AYA2007-68058-C03-01, AYA2010-21766-C03-02, AYA2014-60438-P, AYA2017-84185-P, IACA13-3E-2336, IACA15-BE-3707, EQC2018-004918-P, the Severo Ochoa Program SEV-2015-0548, and also by the Consolider-Ingenio project CSD2010-00064 (EPI: Exploring the Physics of Inflation). This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement number 687312 (RADIOFOREGROUNDS). YCP is supported by a Trinity College JRF and a Rutherford Discovery Fellowship. FP acknowledges support from the Spanish Ministerio de Ciencia, Innovación y Universidades (MICINN) under grant numbers ESP2015–65597-C4-4-R, and ESP2017–86852-C4-2-R. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|