Rachel L. Webster

The Murchison Widefield Array: Design Overview (2009)

Lonsdale, Colin J., Cappallo, Roger J., Morales, Miguel F., Briggs, Frank H., Benkevitch, Leonid, Bowman, Judd D., ...

The Murchison Widefield Array (MWA) is a dipole-based aperture array synthesis telescope designed to operate in the 80-300 MHz frequency range. It is capable of a wide range of science...

Evidence for a nonuniform initial mass function in the local universe (2009)

Meurer, Gerhardt R., Wong, O. I., Kim, J. H., Hanish, D. J., Heckman, Timothy M., Werk, Jessica K., ...

Many of the results in modern astrophysics rest on the notion that the initial mass function (IMF) is universal. Our observations of a sample of H I selected galaxies in the light of Hα and the...

Evidence for a nonuniform initial mass function in the local universe (2009)

Meurer, Gerhardt R., Wong, O. I., Kim, J. H., Hanish, D. J., Heckman, Timothy M., Werk, Jessica K., ...

Many of the results in modern astrophysics rest on the notion that the initial mass function (IMF) is universal. Our observations of a sample of H I selected galaxies in the light of Hα and the...

The Northern HIPASS Optical/IR Catalogue (NOIRCAT) (2008)

Wong, O. Ivy, Webster, Rachel L., Waugh, Meryl, Kilborn, Virginia A., Staveley-Smith, Lister

We present the Northern HIPASS Optical/Infrared Catalogue (NOIRCAT), an optical/near-infrared counterpart catalogue for the Northern HIPASS catalogue (NHICAT). Of the 1002 sources in NHICAT, 655...

The Northern HIPASS Optical/IR Catalogue (NOIRCAT) (2008)

Wong, O. Ivy, Webster, Rachel L., Waugh, Meryl, Kilborn, Virginia A., Staveley-Smith, Lister

We present the Northern HIPASS Optical/Infrared Catalogue (NOIRCAT), an optical/near-infrared counterpart catalogue for the Northern HIPASS catalogue (NHICAT). Of the 1002 sources in NHICAT, 655...

The Northern HIPASS Optical/IR Catalogue (NOIRCAT) (2008)

Wong, O. Ivy, Webster, Rachel L., Waugh, Meryl, Kilborn, Virginia A., Staveley-Smith, Lister

We present the Northern HIPASS Optical/Infrared Catalogue (NOIRCAT), an optical/near-infrared counterpart catalogue for the Northern HIPASS catalogue (NHICAT). Of the 1002 sources in NHICAT, 655...

3 1 (2007)

Paul J Francis, Matthew T. Whiting, Rachel L. Webster

We present quasi-simultaneous multi-colour optical/near-IR photometry for 157 radio selected quasars, forming an unbiassed sub-sample of the Parkes Flat-Spectrum Sample. Data are also presented for...

The Optical/Near-IR Colours of Red Quasars (2007)

Paul Francis Matthew, Matthew T. Whiting, Rachel L. Webster

We present quasi-simultaneous multi-colour optical/near-IR photometry for 157 radio selected quasars, forming an unbiassed sub-sample of the Parkes Flat-Spectrum Sample. Data are also presented for...

A Search for Distant Satellites of Neptune (2007)

Michael Brown And, Rachel L. Webster

The recent discovery of two distant satellites of Uranus suggests that there could be similar bodies orbiting Neptune. Previous surveys for distant satellites of Neptune have had relatively bright...

Spectral Properties of Parkes Flat-spectrum Radio Sources (2007)

Michael J. Drinkwater, Paul J. Francis, Rachel L. Webster

. We have constructed composite spectra of a large sample of flat-spectrum radio sources. The spectra are all very similar over a wide range of radio and optical properties and are also similar to a...

The Spectra of Dusty Quasars (2007)

Paul J. Francis, Rachel L. Webster, Frank J. Masci, Michael J. Drinkwater, Bruce A. Peterson

Flat radio spectrum quasars from the Parkes half Jansky survey show an enormous range of optical to near-IR colours. The spectra of these quasars suggest that this diversity is probably due to...

Field deployment of prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (2007)

Bowman, Judd D., Barnes, David G., Briggs, Frank H., Corey, Brian E., Lynch, Merv J., Bhat, Narayana D. R., ...

Experiments were performed with prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (MWA LFD) to better understand the wide-field, wide-band properties of their design...

Field deployment of prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (2007)

Bowman, Judd D., Barnes, David G., Briggs, Frank H., Corey, Brian E., Lynch, Merv J., Bhat, N. D. Ramesh, ...

Experiments were performed with prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (MWA LFD) to better understand the wide-field, wide-band properties of their design...

Detection of crab giant pulses using the mileura widefield array low frequency demonstrator field prototype system (2007)

Bhat, N. D. Ramesh, Wayth, Randall B., Knight, Haydon S., Bowman, Judd D., Oberoi, Divya, Barnes, David G., ...

We report on the detection of giant pulses from the Crab Nebula pulsar at a frequency of 200 MHz using the field deployment system designed for the Mileura Widefield Array's Low Frequency...

Field deployment of prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (2007)

Bowman, Judd D., Barnes, David G., Briggs, Frank H., Corey, Brian E., Lynch, Merv J., Bhat, N. D. Ramesh, ...

Experiments were performed with prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (MWA LFD) to better understand the wide-field, wide-band properties of their design...

Detection of crab giant pulses using the mileura widefield array low frequency demonstrator field prototype system (2007)

Bhat, N. D. Ramesh, Wayth, Randall B., Knight, Haydon S., Bowman, Judd D., Oberoi, Divya, Barnes, David G., ...

We report on the detection of giant pulses from the Crab Nebula pulsar at a frequency of 200 MHz using the field deployment system designed for the Mileura Widefield Array's Low Frequency...

Field deployment of prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (2007)

Bowman, Judd D., Barnes, David G., Briggs, Frank H., Corey, Brian E., Lynch, Merv J., Bhat, N. D. Ramesh, ...

Experiments were performed with prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (MWA LFD) to better understand the wide-field, wide-band properties of their design...

Detection of crab giant pulses using the mileura widefield array low frequency demonstrator field prototype system (2007)

Bhat, N. D. Ramesh, Wayth, Randall B., Knight, Haydon S., Bowman, Judd D., Oberoi, Divya, Barnes, David G., ...

We report on the detection of giant pulses from the Crab Nebula pulsar at a frequency of 200 MHz using the field deployment system designed for the Mileura Widefield Array's Low Frequency...

Field deployment of prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (2007)

Bowman, Judd D., Barnes, David G., Briggs, Frank H., Corey, Brian E., Lynch, Merv J., Bhat, N. D. Ramesh, ...

Experiments were performed with prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (MWA LFD) to better understand the wide-field, wide-band properties of their design...

Detection of crab giant pulses using the mileura widefield array low frequency demonstrator field prototype system (2007)

Bhat, N. D. Ramesh, Wayth, Randall B., Knight, Haydon S., Bowman, Judd D., Oberoi, Divya, Barnes, David G., ...

We report on the detection of giant pulses from the Crab Nebula pulsar at a frequency of 200 MHz using the field deployment system designed for the Mileura Widefield Array's Low Frequency...

The survey for ionization in neutral gas galaxies III: diffuse, warm ionized medium and escape of ionizing radiation (2007)

Oey, M. Sally, Meurer, Gerhardt R., Yelda, Sylvana, Furst, E. J., Caballero-Nieves, S. M., Hanish, D. J., ...

We use the first data release from the SINGG Hα survey of H I-selected galaxies to study the quantitative behavior of the diffuse, warm ionized medium (WIM) across the range of properties...

Field deployment of prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (2007)

Bowman, Judd D., Barnes, David G., Briggs, Frank H., Corey, Brian E., Lynch, Merv J., Bhat, N. D. R., ...

Experiments were performed with prototype antenna tiles for the Mileura Widefield Array Low Frequency Demonstrator (MWA LFD) to better understand the wide-field, wide-band properties of their design...

Detection of crab giant pulses using the mileura widefield array low frequency demonstrator field prototype system (2007)

Bhat, N. D. R., Wayth, Randall B., Knight, Haydon S., Bowman, Judd D., Oberoi, Divya, Barnes, David G., ...

We report on the detection of giant pulses from the Crab Nebula pulsar at a frequency of 200 MHz using the field deployment system designed for the Mileura Widefield Array's Low Frequency...

The survey for ionization in neutral gas galaxies III: diffuse, warm ionized medium and escape of ionizing radiation (2007)

Oey, M. Sally, Meurer, Gerhardt R., Yelda, Sylvana, Furst, E. J., Caballero-Nieves, S. M., Hanish, D. J., ...

We use the first data release from the SINGG Hα survey of H I-selected galaxies to study the quantitative behavior of the diffuse, warm ionized medium (WIM) across the range of properties...

Field Deployment of Prototype Antenna Tiles for the Mileura Widefield Array--Low Frequency Demonstrator (2006)

Bowman, Judd D., Barnes, David G., Briggs, Frank H., Corey, Brian E., Lynch, Merv J., Bhat, N. D. Ramesh, ...

Experiments were performed with prototype antenna tiles for the Mileura Widefield Array--Low Frequency Demonstrator (MWA-LFD) to better understand the widefield, wideband properties of their design...

Lensview: Software for modelling resolved gravitational lens images (2006)

Wayth, Randall B., Webster, Rachel L.

We have developed a new software tool, Lensview, for modelling resolved gravitational lens images. Based on the LensMEM algorithm, the software finds the best fitting lens mass model and source...

The Weak Clustering of Gas-Rich Galaxies (2006)

Meyer, Martin J., Zwaan, Martin A., Webster, Rachel L., Brown, Michael J. I., Staveley-Smith, Lister

We examine the clustering properties of HI-selected galaxies through an analysis of the HI Parkes All-Sky Survey Catalogue (HICAT) two-point correlation function. Various sub-samples are extracted...

NGC 922 : a new drop-through ring galaxy (2006)

Wong, O., Meurer, Gerhardt R., Bekki, Kenji, Hanish, D. J., Kennicutt, Robert C., Bland-Hawthorn, Jonathan, ...

We have found the peculiar galaxy NGC 922 to be a new drop-through ring galaxy using multiwavelength (ultraviolet-radio) imaging and spectroscopic observations. Its 'C'-shaped morphology and tidal...

NGC 922 : a new drop-through ring galaxy (2006)

Wong, O., Meurer, Gerhardt R., Bekki, Kenji, Hanish, D. J., Kennicutt, Robert C., Bland-Hawthorn, Jonathan, ...

We have found the peculiar galaxy NGC 922 to be a new drop-through ring galaxy using multiwavelength (ultraviolet-radio) imaging and spectroscopic observations. Its 'C'-shaped morphology and tidal...

NGC 922 : a new drop-through ring galaxy (2006)

Wong, O., Meurer, Gerhardt R., Bekki, Kenji, Hanish, D. J., Kennicutt, Robert C., Bland-Hawthorn, Jonathan, ...

We have found the peculiar galaxy NGC 922 to be a new drop-through ring galaxy using multiwavelength (ultraviolet-radio) imaging and spectroscopic observations. Its 'C'-shaped morphology and tidal...

NGC 922 : a new drop-through ring galaxy (2006)

Wong, O., Meurer, Gerhardt R., Bekki, Kenji, Hanish, D. J., Kennicutt, Robert C., Bland-Hawthorn, Jonathan, ...

We have found the peculiar galaxy NGC 922 to be a new drop-through ring galaxy using multiwavelength (ultraviolet-radio) imaging and spectroscopic observations. Its 'C'-shaped morphology and tidal...

NGC 922 : a new drop-through ring galaxy (2006)

Wong, O., Meurer, Gerhardt R., Bekki, Kenji, Hanish, D. J., Kennicutt, Robert C., Bland-Hawthorn, Jonathan, ...

We have found the peculiar galaxy NGC 922 to be a new drop-through ring galaxy using multiwavelength (ultraviolet-radio) imaging and spectroscopic observations. Its 'C'-shaped morphology and tidal...

Erratum: The column density distribution function at z = 0 from H I selected galaxies (2005)

Ryan-Weber, Emma V., Webster, Rachel L., Staveley-Smith, Lister

Corrects an error in: Ryan-Weber, E. V., Webster, R. L., & Staveley-Smith, L. (2003). The column density distribution function at z= 0 from H i selected galaxies. Monthly Notices of the Royal...

Evolution of damped Lyman alpha (2005)

Ryan-Weber, Emma V., Staveley-Smith, Lister, Webster, Rachel L.

We have investigated the effect of spatial resolution on determining pencil-beam-like velocity widths and column densities in galaxies. Three 21-cm data sets are used, the H i Parkes All Sky Survey...

Erratum: The column density distribution function at z = 0 from H I selected galaxies (2005)

Ryan-Weber, Emma V., Webster, Rachel L., Staveley-Smith, Lister

Corrects an error in: Ryan-Weber, E. V., Webster, R. L., & Staveley-Smith, L. (2003). The column density distribution function at z= 0 from H i selected galaxies. Monthly Notices of the Royal...

Evolution of damped Lyman alpha (2005)

Ryan-Weber, Emma V., Staveley-Smith, Lister, Webster, Rachel L.

We have investigated the effect of spatial resolution on determining pencil-beam-like velocity widths and column densities in galaxies. Three 21-cm data sets are used, the H i Parkes All Sky Survey...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael J., Barnes, David G., ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination -90° to +25°. The HIPASS catalogue (HICAT), containing...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael J., Barnes, David G., ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination -90° to +25°. The HIPASS catalogue (HICAT), containing...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael J., Barnes, David G., ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination -90° to +25°. The HIPASS catalogue (HICAT), containing...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael J., Barnes, David G., ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination -90° to +25°. The HIPASS catalogue (HICAT), containing...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael J., Barnes, David G., ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination -90° to +25°. The HIPASS catalogue (HICAT), containing...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael, ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination −90◦ to +25◦. The HIPASS catalogue (HICAT),...

The column density distribution function at z = 0 from HI selected galaxies (2003)

Ryan-Weber, Emma V., Webster, Rachel L., Staveley-Smith, Lister

We have measured the column density distribution function, f(N HI), at z = 0 using 21-cm HI emission from galaxies selected from a blind HI survey. f(NHI) is found to be smaller and flatter at z = 0...

The column density distribution function at z = 0 from HI selected galaxies (2003)

Ryan-Weber, Emma V., Webster, Rachel L., Staveley-Smith, Lister

We have measured the column density distribution function, f(N HI), at z = 0 using 21-cm HI emission from galaxies selected from a blind HI survey. f(NHI) is found to be smaller and flatter at z = 0...

Investigating cosmological weak lensing with the ray-bundle method (2002)

Fluke, Christopher J., Mortlock, Daniel, Webster, Rachel L.

Using the ray-bundle method for calculating gravitational lens magnifications, we outline a method by which the magnification probability may be determined specifically in the weak lensing limit for...

Investigating cosmological weak lensing with the ray-bundle method (2002)

Fluke, Christopher J., Mortlock, Daniel, Webster, Rachel L.

Using the ray-bundle method for calculating gravitational lens magnifications, we outline a method by which the magnification probability may be determined specifically in the weak lensing limit for...

Investigating cosmological weak lensing with the ray-bundle method (2002)

Fluke, Christopher J., Mortlock, Daniel, Webster, Rachel L.

Using the ray-bundle method for calculating gravitational lens magnifications, we outline a method by which the magnification probability may be determined specifically in the weak lensing limit for...

Investigating cosmological weak lensing with the ray-bundle method (2002)

Fluke, Christopher J., Mortlock, Daniel, Webster, Rachel L.

Using the ray-bundle method for calculating gravitational lens magnifications, we outline a method by which the magnification probability may be determined specifically in the weak lensing limit for...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

A study of neutral hydrogen in five small galaxy groups (2001)

Barnes, David G., Webster, Rachel L.

High-resolution Hi imaging observations of a heterogeneous sample of small galaxy groups are presented. The five galaxy groups studied show a broad range of individual Hi properties: e.g. loose...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

A study of neutral hydrogen in five small galaxy groups (2001)

Barnes, David G., Webster, Rachel L.

High-resolution Hi imaging observations of a heterogeneous sample of small galaxy groups are presented. The five galaxy groups studied show a broad range of individual Hi properties: e.g. loose...

The spectra of red quasars (2001)

Francis, Paul J., Drake, Catherine L., Whiting, Matthew T., Drinkwater, Michael J., Webster, Rachel L.

We measure the spectral properties of a representative sub-sample of 187 quasars, drawn from the Parkes Half-Jansky, Flat-radio-spectrum Sample (PHFS). Quasars with a wide range of rest-frame...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

A study of neutral hydrogen in five small galaxy groups (2001)

Barnes, David G., Webster, Rachel L.

High-resolution Hi imaging observations of a heterogeneous sample of small galaxy groups are presented. The five galaxy groups studied show a broad range of individual Hi properties: e.g. loose...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

The spectra of red quasars (2001)

Francis, Paul J., Drake, Catherine L., Whiting, Matthew T., Drinkwater, Michael J., Webster, Rachel L.

We measure the spectral properties of a representative sub-sample of 187 quasars, drawn from the Parkes Half-Jansky, Flat-radio-spectrum Sample (PHFS). Quasars with a wide range of rest-frame...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

A study of neutral hydrogen in five small galaxy groups (2001)

Barnes, David G., Webster, Rachel L.

High-resolution Hi imaging observations of a heterogeneous sample of small galaxy groups are presented. The five galaxy groups studied show a broad range of individual Hi properties: e.g. loose...

Using the 2dF galaxy redshift survey to detect gravitationally-lensed quasars (2000)

Mortlock, Daniel J., Webster, Rachel L.

Galaxy redshift surveys can be used to detect gravitationally-lensed quasars if the spectra obtained are searched for the quasars' emission lines. Previous investigations of this possibility have...

A Search for Bright Kuiper Belt Objects (1998)

Rachel L. Webster, R. L. Webster

Since 1992, 60 large Kuiper belt objects have been detected by ground-based telescopes. Previous surveys which have detected objects have searched approximately 602 ffi and detected objects with...