The LOFAR Two-metre Sky Survey IV. First Data Release: Photometric redshifts and rest-frame magnitudes

被引：61

作者：

Duncan, K. J. ^{[1
]}

Sabater, J. ^{[2
]}

Rottgering, H. J. A. ^{[1
]}

Jarvis, M. J. ^{[3
]}

Smith, D. J. B. ^{[4
]}

Best, P. N. ^{[2
]}

Callingham, J. R. ^{[5
]}

Cochrane, R. ^{[2
]}

Croston, J. H. ^{[6
]}

Hardcastle, M. J. ^{[4
]}

Mingo, B. ^{[6
]}

Morabito, L. ^{[3
]}

Nisbet, D. ^{[2
]}

Prandoni, I. ^{[7
]}

Shimwell, T. W. ^{[1
,5
]}

Tasse, C. ^{[8
]}

White, G. J. ^{[6
,9
]}

Williams, W. L. ^{[4
]}

Alegre, L. ^{[2
]}

Chyzy, K. T. ^{[10
]}

Gurkan, G. ^{[11
]}

Hoeft, M. ^{[12
]}

Kondapally, R. ^{[2
]}

Mechev, A. P. ^{[1
]}

Miley, G. K. ^{[1
]}

Schwarz, D. J. ^{[13
]}

van Weeren, R. J. ^{[1
]}

机构：

[1] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[2] Royal Observ, Inst Astron, SUPA, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[3] Univ Oxford, Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England

[4] Univ Hertfordshire, Sch Phys Astron & Math, Ctr Astrophys Res, Coll Lane, Hatfield AL10 9AB, Herts, England

[5] ASTRON, Netherlands Inst Radio Astron, Postbus 2, NL-7990 AA Dwingeloo, Netherlands

[6] Open Univ, Sch Phys Sci, Walton Hall, Milton Keynes MK7 6AA, Bucks, England

[7] INAF, Ist Radioastron, Via Gobetti 101, I-40129 Bologna, Italy

[8] Univ Paris Diderot, CNRS, Observ Paris, GEPI, 5 Pl Jules Jansse, F-92190 Meudon, France

[9] Rutherford Appleton Lab, Space Sci & Technol Dept, Didcot OX11 0NL, Oxon, England

[10] Jagiellonian Univ, Astron Observ, Ul Orla 171, PL-30244 Krakow, Poland

[11] CSIRO Astron & Space Sci, POB 1130, Bentley, WA 6102, Australia

[12] Thuringer Landessternwarte TLS, Sternwarte 5, D-07778 Tautenburg, Germany

[13] Univ Bielefeld, Fak Phys, Postfach 100131, D-33501 Bielefeld, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2019年 / 622卷

基金：

英国科学技术设施理事会; 美国国家科学基金会; 美国国家航空航天局;

关键词：

radio continuum: galaxies; galaxies: active; galaxies: distances and redshifts; GALAXIES;

D O I：

10.1051/0004-6361/201833562

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The LOFAR Two-metre Sky Survey (LoTSS) is a sensitive, high-resolution 120-168 MHz survey of the Northern sky. The LoTSS First Data Release (DR1) presents 424 square degrees of radio continuum observations over the HETDEX Spring Field (10(h)45(m)00(s) < right ascension < 15(h)30(m)00(s) and 45 degrees 00'00 '' < declination < 57 degrees 00'00 '') with a median sensitivity of 71 mu Jy beam(-1) and a resolution of 6 ''. In this paper we present photometric redshifts (photo-z) for 94.4% of optical sources over this region that are detected in the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) 3 pi steradian survey. Combining the Pan-STARRS optical data with mid-infrared photometry from the Wide-field Infrared Survey Explorer, we estimate photo-zs using a novel hybrid photometric redshift methodology optimised to produce the best possible performance for the diverse sample of radio continuum selected sources. For the radio-continuum detected population, we find an overall scatter in the photo-z of 3.9% and an outlier fraction (vertical bar Z(phot) - Z(spec)vertical bar/(1 + Z(spec)) > 0.15) of 7.9%. We also find that, at a given redshift, there is no strong trend in photo-z quality as a function of radio luminosity. However there are strong trends as a function of redshift for a given radio luminosity, a result of selection effects in the spectroscopic sample and/or intrinsic evolution within the radio source population. Additionally, for the sample of sources in the LoTSS First Data Release with optical counterparts, we present rest-frame optical and mid-infrared magnitudes based on template fits to the consensus photometric (or spectroscopic when available) redshift.

引用

页数：17

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