The Square Kilometre Array (SKA): publications

Synchrotron and inverse-Compton emission from blazar jets - III. Compton-dominant blazars

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 431:2 (2013) 1840-1852

Authors:

William J Potter, Garret Cotter

THE Q/U IMAGING EXPERIMENT INSTRUMENT

ASTROPHYSICAL JOURNAL 768:1 (2013) ARTN 9

Authors:

C Bischoff, A Brizius, I Buder, Y Chinone, K Cleary, RN Dumoulin, A Kusaka, R Monsalve, SK Naess, LB Newburgh, G Nixon, R Reeves, KM Smith, K Vanderlinde, IK Wehus, M Bogdan, R Bustos, SE Church, R Davis, C Dickinson, HK Eriksen, T Gaier, JO Gundersen, M Hasegawa, M Hazumi, C Holler, KM Huffenberger, WA Imbriale, K Ishidoshiro, ME Jones, P Kangaslahti, DJ Kapner, CR Lawrence, EM Leitch, M Limon, JJ McMahon, AD Miller, M Nagai, H Nguyen, TJ Pearson, L Piccirillo, SJE Radford, ACS Readhead, JL Richards, D Samtleben, M Seiffert, MC Shepherd, ST Staggs, O Tajima, KL Thompson, R Williamson, B Winstein, EJ Wollack, JTL Zwart

Uncovering the physics behind the blazar sequence using a realistic model for jet emission

EPJ Web of Conferences EDP Sciences 61 (2013) 05008

Authors:

William J Potter, Garret Cotter

VLT/XSHOOTER and Subaru/MOIRCS spectroscopy of HUDF.YD3: no evidence for Lyman α emission at z=8.55

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 430:4 (2013) 3314-3319

Authors:

Andrew J Bunker, Joseph Caruana, Stephen M Wilkins, Elizabeth R Stanway, Silvio Lorenzoni, Mark Lacy, Matt J Jarvis, Samantha Hickey

The faint source population at 15.7 GHz – I. The radio properties

Monthly Notices of the Royal Astronomical Society Oxford University Press 429:3 (2012) 2080-2097

Authors:

IH Whittam, JM Riley, DA Green, Matthew Jarvis, I Prandoni, G Guglielmino, R Morganti, HJA Röttgering, MA Garrett

Abstract:

We have studied a sample of 296 faint (> 0.5 mJy) radio sources selected from an area of the Tenth Cambridge (10C) survey at 15.7 GHz in the Lockman Hole. By matching this catalogue to several lower frequency surveys (e.g. including a deep GMRT survey at 610 MHz, a WSRT survey at 1.4 GHz, NVSS, FIRST and WENSS) we have investigated the radio spectral properties of the sources in this sample; all but 30 of the 10C sources are matched to one or more of these surveys. We have found a significant increase in the proportion of flat spectrum sources at flux densities below approximately 1 mJy - the median spectral index between 15.7 GHz and 610 MHz changes from 0.75 for flux densities greater than 1.5 mJy to 0.08 for flux densities less than 0.8 mJy. This suggests that a population of faint, flat spectrum sources is emerging at flux densities below 1 mJy. The spectral index distribution of this sample of sources selected at 15.7 GHz is compared to those of two samples selected at 1.4 GHz from FIRST and NVSS. We find that there is a significant flat spectrum population present in the 10C sample which is missing from the samples selected at 1.4 GHz. The 10C sample is compared to a sample of sources selected from the SKADS Simulated Sky by Wilman et al. and we find that this simulation fails to reproduce the observed spectral index distribution and significantly underpredicts the number of sources in the faintest flux density bin. It is likely that the observed faint, flat spectrum sources are a result of the cores of FRI sources becoming dominant at high frequencies. These results highlight the importance of studying this faint, high frequency population.

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