The C-Band All-Sky Survey: total intensity point-source detection over the northern sky

Autor(es):Mostrar menos -

Grumitt, R. D. P. ^[1] ; Taylor, Angela C. ^[1] ; Jew, Luke ^[1] ; Jones, Michael E. ^[1] ; Dickinson, C. ^{[2, 3]} ; Barr, A. ^[3] ; Cepeda-Arroita, R. ^[3] ; Chiang, H. C. ^[4] ; Harper, S. E. ^[3] ; Heilgendorff, H. M. ^[5] ; Jonas, J. L. ^{[6, 7]} ; Leahy, J. P. ^[3] ; Leech, J. ^[1] ; Pearson, T. J. ^[2] ; Peel, M. W. ^{[8, 9]} ; Readhead, A. C. S. ^[2] ; Sievers, J. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Oxford, Subdept Astrophys, Denys Wilkinson Bldg, Keble Rd, Oxford OX1 3RH - England

^[2] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 - USA

^[3] Univ Manchester, Sch Nat Sci, Dept Phys & Astron, Jodrell Bank Ctr Astrophys, Alan Turing Bldg, Oxford Rd, Manchester M13 9PL, Lancs - England

^[4] McGill Univ, Dept Phys, 3600 Rue Univ, Montreal, PQ H3A 2T8 - Canada

^[5] Univ KwaZulu Natal, Sch Math Stat & Comp Sci, Astrophys & Cosmol Res Unit, Westville Campus, Private Bag X54001, ZA-4000 Durban - South Africa

^[6] Rhodes Univ, Dept Phys & Elect, ZA-6139 Grahamstown - South Africa

^[7] South African Radio Astron Observ, 2 Fir Rd, ZA-7925 Cape Town - South Africa

^[8] Inst Astrofis Canarias, E-38205 Tenerife - Spain

^[9] Univ La Laguna ULL, Dept Astrofis, E-38206 Tenerife - Spain

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 496, n. 2, p. 1941-1958, AUG 2020.
• Citações Web of Science: 0

Resumo

We present a point-source detection algorithm that employs the second-order Spherical Mexican Hat wavelet filter (SMHW2), and use it on C-Band All-Sky Survey (C-BASS) northern intensity data to produce a catalogue of point sources. This catalogue allows us to cross-check the C-BASS flux-density scale against existing source surveys, and provides the basis for a source mask that will be used in subsequent C-BASS and cosmic microwave background (CMB) analyses. The SMHW2 allows us to filter the entire sky at once, avoiding complications from edge effects arising when filtering small sky patches. The algorithm is validated against a set of Monte Carlo simulations, consisting of diffuse emission, instrumental noise, and various point-source populations. The simulated source populations are successfully recovered. The SMHW2 detection algorithm is used to produce a 4.76 GHz northern sky source catalogue in total intensity, containing 1784 sources and covering declinations delta >= -10 degrees. The C-BASS catalogue is matched with the Green Bank 6 cm (GB6) and Parkes-MIT-NRAO (PMN) catalogues over their areas of common sky coverage. From this we estimate the 90 per cent completeness level to be approximately 610 mJy, with a corresponding reliability of 98 per cent, when masking the brightest 30 per cent of the diffuse emission in the C-BASS northern sky map. We find the C-BASS and GB6 flux-density scales to be consistent with one another to within approximately 4 per cent. (AU)

• Processo FAPESP: 15/19936-1 - BINGO: uma sonda ultra-sensitiva de hidrogênio e emissão contínua de rádio para medida do setor escuro do universo
• Beneficiário: Michael William Peel
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores