| Full text | |
| Author(s): Show less - |
Dickinson, C.
[1, 2]
;
Barr, A.
[2]
;
Chiang, H. C.
[3, 4]
;
Copley, C.
[5, 6, 7]
;
Grumitt, R. D. P.
[5]
;
Harper, S. E.
[2]
;
Heilgendorff, H. M.
[4]
;
Jew, L. R. P.
[5]
;
Jonas, J. L.
[6, 7]
;
Jones, Michael E.
[5]
;
Leahy, J. P.
[2]
;
Leech, J.
[5]
;
Leitch, E. M.
[1]
;
Muchovej, S. J. C.
[1]
;
Pearson, T. J.
[1]
;
Peel, M. W.
[2, 8]
;
Readhead, A. C. S.
[1]
;
Sievers, J.
[3, 9]
;
Stevenson, M. A.
[1]
;
Taylor, Angela C.
[5]
Total Authors: 20
|
| Affiliation: | [1] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 - USA
[2] Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Alan Turing Bldg, Oxford Rd, Manchester M13 9PL, Lancs - England
[3] McGill Univ, Dept Phys, 3600 Rue Univ, Montreal, PQ H3A 2T8 - Canada
[4] Univ KwaZulu Natal, Sch Math Stat & Comp Sci, Astrophys & Cosmol Res Unit, Westville Campus, Private Bag X54001, ZA-4000 Durban - South Africa
[5] Univ Oxford, Subdept Astrophys, Denys Wilkinson Bldg, Keble Rd, Oxford OX1 3RH - England
[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] Univ Sao Paulo, Inst Fis, Dept Fis Matemat, Rua Matao 1371, Sao Paulo - Brazil
[9] Univ KwaZulu Natal, Sch Chem & Phys, Westville Campus, Private Bag X54001, ZA-4000 Durban - South Africa
Total Affiliations: 9
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 485, n. 2, p. 2844-2860, MAY 2019. |
| Web of Science Citations: | 1 |
| Abstract | |
The C-Band All-Sky Survey (C-BASS) is a high sensitivity all-sky radio survey at an angular resolution of 45 arcmin and a frequency of 4.7 GHz. We present a total intensity map of the North Celestial Pole (NCP) region of sky, above declination >+80 degrees, which is limited by source confusion at a level of approximate to 0.6mK rms. We apply the template-fitting (cross-correlation) technique to WMAP and Planck data, using the C-BASS map as the synchrotron template, to investigate the contribution of diffuse foreground emission at frequencies similar to 20-40 GHz. We quantify the anomalous microwave emission (AME) that is correlated with far-infrared dust emission. The AME amplitude does not change significantly (< 10 per cent) when using the higher frequency C-BASS 4.7 GHz template instead of the traditional Haslam 408 MHz map as a tracer of synchrotron radiation. We measure template coefficients of 9.93 +/- 0.35 and 9.52 +/- 0.34 K per unit tau(353) when using the Haslam and C-BASS synchrotron templates, respectively. The AME contributes 55 +/- 2 mu K rms at 22.8 GHz and accounts for approximate to 60 per cent of the total foreground emission. Our results show that a harder (flatter spectrum) component of synchrotron emission is not dominant at frequencies greater than or similar to 5 GHz; the best-fitting synchrotron temperature spectral index is beta = -2.91 +/- 0.04 from 4.7 to 22.8 GHz and beta = -2.85 +/- 0.14 from 22.8 to 44.1 GHz. Free-free emission is weak, contributing approximate to 7 mu K rms (approximate to 7 per cent) at 22.8 GHz. The best explanation for the AME is still electric dipole emission from small spinning dust grains. (AU) | |
| FAPESP's process: | 15/19936-1 - BINGO: an ultra-sensitive survey of hydrogen and radio continuum emission to measure the dark universe |
| Grantee: | Michael William Peel |
| Support Opportunities: | Research Grants - Young Investigators Grants |