Exploring the infrared/radio correlation at high redshift (2008)
Ibar, Edo, Cirasuolo, Michele, Ivison, Rob, Best, Philip, Smail, Ian, Biggs, Andy, ...
We have analysed the 24um properties of a radio-selected sample in the Subaru-XMM/Newton Deep Field in order to explore the behaviour of the FIR/radio relation at high redshifts. Statistically, the...
Evidence for a large fraction of Compton-thick quasars at high redshift (2007)
MartÃnez-Sansigre, Alejo, Rawlings, Steve, Bonfield, David G., Mateos, Silvia, Simpson, Chris, Watson, Mike, ...
Using mid-infrared and radio selection criteria, we pre-select a sample of candidate high-redshift type 2 quasars in the Subaru XMM-Newton Deep Field (SXDF). To filter out starburst contaminants, we...
Evidence for a large fraction of Compton-thick quasars at high redshift (2006)
Martinez-Sansigre, Alejo, Rawlings, Steve, Bonfield, David G., Mateos, Silvia, Simpson, Chris, Watson, Mike, ...
Using mid-infrared and radio selection criteria, we pre-select a sample of candidate high-redshift type-2 quasars in the Subaru XMM-Newton Deep Field (SXDF). To filter out starburst contaminants, we...
Extremely red objects in the UKIDSS Ultra Deep Survey Early Data Release (2006)
Simpson, Chris, Almaini, Omar, Cirasuolo, Michele, Dunlop, Jim, Foucaud, Sebastien, Hirst, Paul, ...
We construct a sample of extremely red objects (EROs) within the UKIDSS Ultra Deep Survey by combining the Early Data Release with optical data from the Subaru/XMM-Newton Deep Field. We find a total...
Dust and Gas Obscuration in ELAIS Deep X-Ray Survey Reddened Quasars (2004)
Willott, Chris J., Simpson, Chris, Almaini, Omar, Johnson, Olivia, Lawrence, Andrew, Dunlop, James S., ...
Hard X-ray surveys have uncovered a large population of heavily obscured AGNs. They also reveal a population of quasars with moderate obscuration at both visible and X-ray wavelengths. We use...
Roche, Nathan, Dunlop, James, Almaini, Omar
We identify a deep sample of 198 extremely red objects (EROs) in (50.4 sq. arcmin of) the Chandra Deep Field South, selected as I-K>3.92 galaxies to a limit K=22. The ERO number counts remain well...
Ivison, Rob, Greve, Thomas, Smail, Ian, Dunlop, James, Roche, Nathan, Scott, Susie, ...
The SCUBA 8-mJy survey is the largest submm extragalactic mapping survey undertaken to date, centred on the Lockman Hole and ELAIS N2 regions. Here, we present new 1.4-GHz imaging of the depth and...
The Clustering, Number Counts and Morphology of Extremely Red (R-K>5) Galaxies to K=21 (2002)
Roche, Nathan, Almaini, Omar, Dunlop, James, Ivison, R. J., Willott, Chris
We investigate the number counts, clustering, morphology and radio/X-ray emission of extremely red objects (EROs), defined as galaxies with R-K>5.0. This criterion will select old, passive...
Stellar contributors to the hard X-ray background? (2000)
Natarajan, Priyamvada, Almaini, Omar
We use simple energetic arguments to estimate the contribution of massive X-ray binaries and supernova remnants to the cosmic X-ray background (XRB) at energies in excess of 2 keV. Recent surveys...
Using STIS to find Gamma-Ray Burst Redshifts (1997)
Bloom, Joshua S., Sigurdsson, Steinn, Almaini, Omar, Tanvir, Nial R., Johnson, Rachel A.
A recent spectrum of the optical afterglow of GRB 970508 suggests that gamma-ray bursts (GRBs) are cosmological in origin and it is of crucial importance to derive an accurate distance to each burst....
A deep ROSAT Survey - XII. The X-ray spectra of faint ROSAT sources (1996)
Almaini, Omar, Shanks, Tom, Boyle, Brian J., Griffiths, Richard E., Roche, Nathan, Stewart, Gordon C., ...
Optical spectroscopy has enabled us to identify the optical counterparts to over 200 faint X-ray sources to a flux limit of S_(0.5-2keV)=4x10^-15 erg s^-1 cm^-2 on 5 deep ROSAT fields. Here we...
X-ray emission from faint galaxies and quasars. (1996)
Thesis (Ph. D.)--University of Durham, 1996.