The Apertif science verification campaign Characteristics of polarised radio sources

被引：11

作者：

Adebahr, B. ^{[1
]}

Berger, A. ^{[1
]}

Adams, E. A. K. ^{[2
,3
]}

Hess, K. M. ^{[2
,3
,4
]}

de Blok, W. J. G. ^{[2
,3
,12
,13
]}

Denes, H. ^{[2
]}

Moss, V. A. ^{[2
,5
,6
]}

Schulz, R. ^{[2
]}

van der Hulst, J. M. ^{[2
]}

Connor, L. ^{[2
]}

Damstra, S. ^{[2
]}

Hut, B. ^{[2
]}

Ivashina, M. V. ^{[11
]}

Loose, G. M. ^{[2
]}

Maan, Y. ^{[2
,9
]}

Mika, A. ^{[2
]}

Mulder, H. ^{[2
]}

Norden, M. J. ^{[2
]}

Oostrum, L. C. ^{[2
,7
,10
]}

Orru, E. ^{[2
]}

Ruiter, M. ^{[2
]}

Smits, R. ^{[2
]}

van Cappellen, W. A. ^{[2
]}

van Leeuwen, J. ^{[2
,7
]}

Vermaas, N. J. ^{[2
]}

Voh, D. ^{[2
]}

Ziemke, J. ^{[2
,8
]}

机构：

[1] Ruhr Univ Bochum AIRUB, Astron Inst, Univ Str 150, D-44801 Bochum, Germany

[2] Netherlands Inst Radio Astron, ASTRON, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands

[3] Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands

[4] Inst Astrofis Andalucia CSIC, Glorieta Astron S-N, Granada 18008, Spain

[5] CSIRO Astron & Space Sci, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia

[6] Univ Sydney, Sydney Inst Astron, Sch Phys, Sydney, NSW 2006, Australia

[7] Univ Amsterdam, Anton Pannekoek Inst, Postbus 94249, NL-1090 GE Amsterdam, Netherlands

[8] Univ Oslo, Ctr Informat Technol, Box 1059, N-0316 Oslo, Norway

[9] Tata Inst Fundamental Res, Natl Ctr Radio Astrophys, Pune 411007, Maharashtra, India

[10] Netherlands eSci Ctr, Sci Pk 140, NL-1098 XG Amsterdam, Netherlands

[11] Chalmers Univ Technol, Dept Elect Engn, Gothenburg, Sweden

[12] Univ Cape Town, Dept Astron, Private Bag X3, ZA-7701 Rondebosch, South Africa

[13] CALTECH, Cahill Ctr Astron, Pasadena, CA 91125 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 663卷

基金：

美国国家科学基金会; 欧洲研究理事会; 美国国家航空航天局; 荷兰研究理事会;

关键词：

methods; data analysis; polarization; surveys; galaxies; active; magnetic fields; ACTIVE GALACTIC NUCLEI; STAR-FORMING GALAXIES; CIRCULAR-POLARIZATION; MAGNETIC-FIELDS; DATA RELEASE; SKY SURVEY; SPIRAL GALAXIES; LOCAL UNIVERSE; SOURCE COUNTS; DEEP;

D O I：

10.1051/0004-6361/202243201

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. The characteristics of the polarised radio sky are a key ingredient in constraining evolutionary models of magnetic fields in the Universe and their role in feedback processes. The origin of the polarised emission and the characteristics of the intergalactic medium on the line of sight can be investigated using large samples of polarised sources. Ancillary infrared (IR) and optical data can be used to study the nature of the emitting objects. Aims. We analyse five early science datasets from the APERture Tile in Focus (Apertif) phased array feed system to verify the polarisation capabilities of Apertif in view of future larger data releases. We aim to characterise the source population of the polarised sky in the L-Band using polarised source information in combination with IR and optical data. Methods. We use automatic routines to generate full field-of-view Q- and U-cubes and perform rotation measure (RM)-Synthesis, source finding, and cross-matching with published radio, optical, and IR data to generate polarised source catalogues. All sources were inspected individually by eye for verification of their IR and optical counterparts. Spectral energy distribution (SED)-fitting routines were used to determine photometric redshifts, star-formation rates, and galaxy masses. IR colour information was used to classify sources as active galactic nuclei (AGN) or star-forming-dominated and early- or late-type. Results. We surveyed an area of 56 deg(2) and detected 1357 polarised source components in 1170 sources. The fraction of polarised sources is 10.57% with a median fractional polarisation of 4.70 +/- 0.14%. We confirmed the reliability of the Apertif measurements by comparing them with polarised cross-identified NVSS sources. Average RMs of the individual fields lie within the error of the best Milky Way foreground measurements. All of our polarised sources were found to be dominated by AGN activity in the radio regime with most of them being radio-loud (79%) and of the Fanaroff-Riley (FR)II class (87%). The host galaxies of our polarised source sample are dominated by intermediate disc and star-forming disc galaxies. The contribution of star formation to the radio emission is on the order of a few percent for approximate to 10% of the polarised sources while for approximate to 90% it is completely dominated by the AGN. We do not see any change in fractional polarisation for different star-formation rates of the AGN host galaxies. Conclusions. The Apertif system is suitable for large-area high-sensitivity polarised sky surveys. The data products of the polarisation analysis pipeline can be used to investigate the Milky Way magnetic field on projected scales of several arcminutes as well as the origin of the polarised emission in AGN and the properties of their host galaxies.

引用

页数：24

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