R. G. Mcmahon

Publication List Details

Period

1987 - 2008

Number

168

Co-Authors

Discovery of a redshift 6.13 quasar in the UKIRT Infrared Deep Sky Survey (2008)

Mortlock, D. J., Patel, M., Warren, S. J., Venemans, B. P., McMahon, R. G., Hewett, P. C., ...

Optical and near-infrared (NIR) spectra are presented for ULAS J131911.29+095951.4 (hereafter ULAS J1319+0950), a new redshift z = 6.127 +/- 0.004 quasar discovered in the Third Data Release (DR3) of...

Two New Large Separation Gravitational Lenses from SDSS (2008)

Belokurov, V., Evans, N. W., Hewett, P. C., Moiseev, A., McMahon, R. G., Sanchez, S. F., ...

We present discovery images, together with follow-up imaging and spectroscopy, of two large separation gravitational lenses found by our survey for wide arcs (the CASSOWARY). The survey exploits the...

Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey (2008)

Pinfield, D. J., Burningham, B., Tamura, M., Leggett, S. K., Lodieu, N., Lucas, P. W., ...

We present the discovery of fifteen new T2.5-T7.5 dwarfs (with estimated distances between ~24-93pc, identified in the first three main data releases of the UKIRT Infrared Deep Sky Survey. This...

Light curves of five type Ia supernovae at intermediate redshift (2007)

Amanullah, R., Stanishev, V., Goobar, A., Schahmaneche, K., Astier, P., Balland, C., ...

We present multi-band light curves and distances for five type Ia supernovae at intermediate redshifts, 0.18

The XMM-Newton bright serendipitous survey. Identification and optical spectral properties (2007)

Caccianiga, A., Severgnini, P., Della Ceca, R., Maccacaro, T., Cocchia, F., Barcons, X., ...

AIMS: We present the optical classification and redshift of 348 X-ray selected sources from the XMM-Newton Bright Serendipitous Survey (XBS) which contains a total of 400 objects (identification...

The XMM-Newton Serendipitous Survey V. Optical identification of the XMM-Newton Medium sensitivity Survey (XMS) (2007)

Barcons, X., Carrera, F. J., Ceballos, M. T., Page, M. J., Bussons-Gordo, J., Corral, A., ...

We present the XMM-Newton Medium sensitivity Survey (XMS), including a total of 318 X-ray sources found among the serendipitous content of 25 XMM-Newton target fields. The XMS comprises four largely...

New UltraCool and Halo White Dwarf Candidates in SDSS Stripe 82 (2007)

Vidrih, S., Bramich, D. M., Hewett, P. C., Evans, N. W., Gilmore, G., Hodgkin, S., ...

A 2.5 x 100 degree region along the celestial equator (Stripe 82) has been imaged repeatedly from 1998 to 2005 by the Sloan Digital Sky Survey. A new catalogue of ~4 million light-motion curves,...

The Cosmic Horseshoe: Discovery of an Einstein Ring around a Giant Luminous Red Galaxy (2007)

Belokurov, V., Evans, N. W., Moiseev, A., King, L. J., Hewett, P. C., Pettini, M., ...

We report the discovery of an almost complete Einstein ring of diameter 10" in Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5). Spectroscopic data from the 6m telescope of the Special...

Spectroscopic observations of eight supernovae at intermediate redshift (2007)

Balland, C., Mouchet, M., Amanullah, R., Astier, P., Fabbro, S., Folatelli, G., ...

We present spectra of six Type Ia and two Type II supernovae obtained in June 2002 at the William Herschel Telescope during a search for Type Ia supernovae (SNIa) at intermediate redshift. Supernova...

Spectroscopic observations of eight supernovae at intermediate redshift (2007)

Balland, C., Mouchet, M., Amanullah, R., Astier, P., Fabbro, S., Folatelli, G., ...

We present spectra of six Type Ia and two Type II supernovae obtained in June 2002 at the William Herschel Telescope during a search for Type Ia supernovae (SNIa) at intermediate redshift. Supernova...

Spectroscopic observations of eight supernovae at intermediate redshift (2007)

Balland, C., Mouchet, M., Amanullah, R., Astier, P., Fabbro, S., Folatelli, G., ...

We present spectra of six Type Ia and two Type II supernovae obtained in June 2002 at the William Herschel Telescope during a search for Type Ia supernovae (SNIa) at intermediate redshift. Supernova...

The XMM-SSC survey of hard-spectrum XMM-Newton sources 1: optically bright sources (2007)

Page, M. J., Lehmann, I., Boller, Th., Watson, M. G., Dwelly, T., Hess, S., ...

We present optical and X-ray data for a sample of serendipitous XMM-Newton sources that are selected to have 0.5-2 keV vs 2-4.5 keV X-ray hardness ratios which are harder than the X-ray background....

Spectroscopic observations of eight supernovae at intermediate redshift (2007)

Balland, C., Mouchet, M., Amanullah, R., Astier, P., Fabbro, S., Folatelli, G., ...

We present spectra of six Type Ia and two Type II supernovae obtained in June 2002 at the William Herschel Telescope during a search for Type Ia supernovae (SNIa) at intermediate redshift. Supernova...

The distant Type Ia supernova rate (2007)

Pain, R., Fabbro, S., Sullivan, M., Ellis, R. S., Aldering, G., Astier, P., ...

We present a measurement of the rate of distant Type Ia supernovae derived using 4 large subsets of data from the Supernova Cosmology Project. Within this fiducial sample, which surveyed about 12...

Cosmology from Type Ia Supernovae (2007)

Perlmutter, S., Aldering, G., Deustua, S., Fabbro, S., Goldhaber, G., Groom, D. E., ...

This presentation reports on first evidence for a low-mass-density/positive-cosmological-constant universe that will expand forever, based on observations of a set of 40 high-redshift supernovae. The...

Measurements of Omega and Lambda from 42 High-Redshift Supernovae (2007)

Perlmutter, S., Aldering, G., Goldhaber, G., Knop, R. A., Nugent, P., Castro, P. G., ...

We report measurements of the mass density, Omega_M, and cosmological-constant energy density, Omega_Lambda, of the universe based on the analysis of 42 Type Ia supernovae discovered by the Supernova...

Discovery of a Supernova Explosion at Half the Age of the Universe and its Cosmological Implications (2007)

Perlmutter, S., Aldering, G., Della Valle, M., Deustua, S., Ellis, R. S., Fabbro, S., ...

The ultimate fate of the universe, infinite expansion or a big crunch, can be determined by measuring the redshifts, apparent brightnesses, and intrinsic luminosities of very distant supernovae....

Measurements of the Cosmological Parameters $\Omega$ and $\Lambda$ from the First 7 Supernovae at $z \geq$ 0.35 (2007)

Perlmutter, S., Gabi, S., Goldhaber, G., Groom, D. E., Hook, I. M., Kim, A. G., ...

We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven...

Implications For The Hubble Constant from the First Seven Supernovae at $z \geq$ 0.35 (2007)

Kim, A.G., Gabi, S., Goldhaber, G., Groom, D. E., Hook, I. M., Kim, M. Y., ...

The Supernova Cosmology Project has discovered over twenty-eight supernovae (SNe) at 0.35

The Type Ia Supernova Rate at z$\sim 0.4 $ (2007)

Pain, R., Hook, I. M., Deustua, S., Gabi, S., Goldhaber, G., Goobar, A., ...

We present the first measurement of the rate of Type Ia supernovae at high redshift. The result is derived using a large subset of data from the Supernova Cosmology Project. Three supernovae were...

The discovery of the first luminous z~6 quasar in the UKIDSS Large Area Survey (2006)

Venemans, B. P., McMahon, R. G., Warren, S. J., Gonzalez-Solares, E. A., Hewett, P. C., Mortlock, D. J., ...

We present the initial results from our search for high redshift, z > 6, quasars using near infrared data from the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). Our analysis of 106...

The UKIRT infrared deep sky survey early data release (2006)

Dye, S., Warren, S.J., Hambly, N.C., Cross, N.J.G., Hodgkin, S.T., Irwin, M.J., ...

This paper defines the UKIRT Infrared Deep Sky Survey (UKIDSS) Early Data Release (EDR). UKIDSS is a set of five large near-infrared surveys being undertaken with the United Kingdom Infrared...

A sensitive submillimetre survey of Broad Absorption Line quasars (2006)

Priddey, R. S., Gallagher, S. C., Isaak, K. G., Sharp, R. G., McMahon, R. G., Butner, H. M.

Using the SCUBA bolometer array on the JCMT, we have carried out a submillimetre survey of Broad Absorption Line quasars (BALQs). The sample has been chosen to match, in redshift and optical...

The UKIRT Infrared Deep Sky Survey First Data Release (2006)

Warren, S. J., Hambly, N. C., Dye, S., Almaini, O., Cross, N. J. G., Edge, A. C., ...

The First Data Release (DR1) of the UKIRT Infrared Deep Sky Survey (UKIDSS) took place on 2006 July 21. UKIDSS is a set of five large near-infrared surveys, covering a complementary range of areas,...

The UKIRT Infrared Deep Sky Survey (UKIDSS) (2006)

Lawrence, A., Warren, S. J., Almaini, O., Edge, A. C., Hambly, N. C., Jameson, R. F., ...

We describe the goals, design, implementation, and initial progress of the UKIRT Infrared Deep Sky Survey (UKIDSS), a seven year sky survey which began in May 2005, using the UKIRT Wide Field Camera....

X-ray spectral properties of high-redshift radio-loud quasars beyond redshift 4--first results (2006)

Yuan, W., Fabian, A. C., Worsley, M. A., McMahon, R. G.

(abridged) We firstly present the results of X-ray spectroscopic observations with XMM-Newton for four high-redshift radio-loud quasars at z>4. These observations more than double the number of z>4...

Optical and Near-Infrared Observations of the Peculiar Type Ia Supernova 1999ac (2006)

Phillips, Mark M., Krisciunas, Kevin, Suntzeff, Nicholas B., Abraham, R. G., Beckett, M. G., Bonati, M., ...

We present 39 nights of optical photometry, 34 nights of infrared photometry, and 4 nights of optical spectroscopy of the Type Ia SN 1999ac. This supernova was discovered two weeks before maximum...

Gemini Spectroscopy of Supernovae from SNLS: Improving High Redshift SN Selection and Classification (2005)

Howell, D. A., Sullivan, M., Perrett, K., Bronder, T. J., Hook, I. M., Astier, P., ...

We present new techiques for improving the efficiency of supernova (SN) classification at high redshift using 64 candidates observed at Gemini North and South during the first year of the Supernova...

CO and Dust in PSS2322+1944 at a redshift of 4.12 (2005)

Cox, P., Omont, A., Djorgovski, S. G., Bertoldi, F., Pety, J., Carilli, C. L., ...

Using the IRAM interferometer we have detected J=4-3 and 5-4 CO line emission toward the radio quiet quasar PSS2322+1944. At a redshift of z_CO=4.1199 this is the fourth and strongest detection of CO...

A 1.2mm MAMBO/IRAM-30m Survey of Dust Emission from the Highest Redshift PSS Quasars (2005)

Omont, A., Cox, P., Bertoldi, F., McMahon, R. G., Carilli, C., Isaak, K. G.

We report 250 GHz (1.2mm) observations of redshift > 3.8 quasars from the Palomar Sky Survey (PSS) sample, using the Max-Planck Millimetre Bolometer (MAMBO) array at the IRAM 30-metre telescope....

A 1.2mm MAMBO/IRAM-30m Study of Dust Emission from optically luminous z~2 Quasars (2005)

Omont, A., Beelen, A., Bertoldi, F., Cox, P., Carilli, C., Priddey, R. S., ...

We report 250GHz (1.2mm) observations of redshift 1.8 < z < 2.8 optically luminous (M_B < -27.0), radio quiet quasars using the Max-Planck Millimeter Bolometer (MAMBO) array at the IRAM 30-metre...

Radio Observations of Infrared Luminous High Redshift QSOs (2005)

Carilli, C. L., Bertoldi, F., Omont, A., Cox, P., McMahon, R. G., Isaak, K. G.

We present Very Large Array (VLA) observations at 1.4 GHz and 5 GHz of a sample of 12 Quasi-stellar Objects (QSOs) at z = 3.99 to 4.46. The sources were selected as the brightest sources at 250 GHz...

The European Large Area ISO Survey: optical identifications of 15-mum and 1.4-GHz sources in N1 and N2 (2005)

Gonzalez-Solares, E.A., Perez-Fournon, I., Rowan-Robinson, M., Oliver, S., Vaccari, M., Lari, C., ...

We present the multiwavelength properties and catalogue of the 15mum and 1.4GHz radio sources detected in the European Large Area ISO Survey (ELAIS) areas N1 and N2. Using the optical data from the...

XMM observations of the high-redshift quasar RXJ1028.6-0844 at z=4.276: soft X-ray spectral flattening (2004)

Yuan, W., Fabian, A. C., Celotti, A., McMahon, R. G., Matsuoka, M.

We present results from a new XMM-Newton observation of the high-redshift quasar RXJ1028.6-0844 at a redshift of 4.276. The soft X-ray spectral flattening, as reported by a study with ASCA previously...

Discovery of high-amplitude X-ray variability in the Seyfert-LINER transition galaxy NGC7589 (2004)

Yuan, W., Komossa, St., Xu, D., Osborne, J. P., Watson, M. G., McMahon, R. G.

We present the first result of a programme to search for large flux variations in the X-ray sources of the XMM Serendipitous Survey compared to previous ROSAT observations. An increase in X-ray flux...

Dust and gas obscuration in ELAIS deep x-ray survey reddened quasars. (2004)

Willott, C. J., Simpson, D., Johnson, O., Dunlop, J. 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...

The Star Formation Rate of the Universe at z~6 from the Hubble Ultra Deep Field (2004)

Bunker, A. J., Stanway, E. R., Ellis, R. S., McMahon, R. G.

We determine the abundance of i'-band drop-outs in the recently-released HST/ACS Hubble Ultra Deep Field (UDF). Since the majority of these sources are likely to be z~6 galaxies whose flux decrement...

The European Large Area ISO Survey (ELAIS): Optical Identifications of 15 micron and 1.4 GHz sources in N1 and N2 (2004)

Gonzalez-Solares, E. A., Perez-Fournon, I., Rowan-Robinson, M., Oliver, S., Vaccari, M., Lari, C., ...

We present the optical identification of mid-IR and radio sources detected in the European Large Area ISO Survey (ELAIS) areas N1 and N2. Using the r' band optical data from the Wide Field Survey we...

A survey for low luminosity quasars at redshift z~5 (2004)

Sharp, R. G., Crampton, D., Hook, I. M., McMahon, R. G.

We present the results of a multi-colour (VIZ) survey for low luminosity (M_B

ELAIS deep X-ray survey. I. (Manners+, 2003) (2004)

Manners, J.C., Johnson, O., Almaini, O., Willott, C.J., Gonzalez-Solares, E., Lawrence, A., ...

The ELAIS Deep X-ray Survey (EDXS) is being conducted in the northern ELAIS regions N1 and N2. The Chandra data consist of approximately 75 ks exposures in each field. Region N1 was observed on 2000...

The European Large-Area ISO Survey (ELAIS): the final band-merged catalogue (2004)

Rowan-Robinson, M., Lari, C., Perez-Fournon, I., Gonzalez-Solares, E. A., La Franca, F., Vaccari, M., ...

We present the final band-merged European Large-Area ISO Survey (ELAIS) Catalogue at 6.7, 15, 90 and 175 ‚‚mu;m, and the associated data at U, g', r', i', Z, J, H, K and 20 cm. The origin of the...

ELAIS: final band-merged catalogue (2004)

Rowan-Robinson, M., Lari, C., Perez-Fournon, I., Gonzalez-Solares, E. A., Franca, F. L., Vaccari, M., ...

The catalog represents the final band-merged European Large-Area ISO Survey (ELAIS) Catalogue at 6.7, 15, 90 and 175{mu}m, and the associated data at U, g', r', i', Z, J, H, K and 20cm. Details about...

A Homogeneous Sample of Sub-DLAs I: Construction of the Sample and Chemical Abundance Measurements (2003)

Dessauges-Zavadsky, M., Peroux, C., D'Odorico, S., McMahon, R. G.

In this first paper of a series, we report on the use of quasar spectra obtained with the UVES high resolution spectrograph and available through the ESO VLT archive to build the first sample of...

The ELAIS deep X-ray survey - I. Chandra source catalogue and first results (2003)

Manners, J.C., Johnson, O., Almaini, O., Willott, C.J., Gonzalez-Solares, E., Lawrence, A., ...

We present an analysis of two deep (75 ks) Chandra observations of the European Large Area Infrared Space Observatory (ISO) Survey (ELAIS) fields N1 and N2 as the first results from the ELAIS deep...

A 1.2 mm MAMBO/IRAM-30 m study of dust emission from optically luminous z approximate to 2 quasars (2003)

Omont, A., Beelen, A., Bertoldi, F., Cox, P., Carilli, C. L., Priddey, R. S., ...

We report 250 GHz (1.2 mm) observations of redshift 1.8 < z < 2.8 optically luminous (M-B < -27.0), radio quiet quasars using the Max-Planck Millimeter Bolometer (MAMBO) array at the IRAM 30-metre...

A 1.2mm MAMBO/IRAM-30m Study of Dust Emission from optically luminous z~2 Quasars (2002)

Omont, A., Beelen, A., Bertoldi, F., Cox, P., Carilli, C., Priddey, R. S., ...

We report 250GHz (1.2mm) observations of redshift 1.8 < z < 2.8 optically luminous (M_B < -27.0), radio quiet quasars using the Max-Planck Millimeter Bolometer (MAMBO) array at the IRAM 30-metre...

Reddening-Independent Quasar Selection from a Wide-Field Optical and Near-IR Imaging Survey (2002)

Sharp, R. G., Sabbey, C. N., Vivas, A. K., Oemler Jr, A., McMahon, R. G., Hodgkin, S. T., ...

We combine deep, wide-field near-IR and optical imaging to demonstrate a reddening-independent quasar selection technique based on identifying outliers in the (g-z) / (z-H) colour diagram. In three...

Photometric Redshifts for an Optical/Near-Infrared Catalogue in the Chandra Deep Field South (2002)

Stanway, E R, Bunker, A, McMahon, R G

Photometric redshifts have proven a powerful tool in identifying galaxies over a large range of lookback times. We have been generalising this technique to incorporate the selection of candidate high...

The ELAIS Deep X-ray Survey I: Chandra Source Catalogue and First Results (2002)

Manners, J. C., Johnson, O., Almaini, O., Willott, C. J., Gonzalez-Solares, E., Lawrence, A., ...

We present an analysis of two deep (75 ks) Chandra observations of the European Large Area ISO Survey (ELAIS) fields N1 and N2 as the first results from the ELAIS deep X-ray survey. This survey is...

Discovery of Radio-loud Quasars with Redshifts above 4 from the PMN sample (2002)

Hook, I. M., McMahon, R. G., Shaver, P. A., Snellen, I. A. G.

We present results of a new, large survey for high-redshift radio-loud quasars, which targets quasars with z>4. The survey is based on the PMN and NVSS radio surveys, optically identified using...