Steve Maddox - Academia.edu (original) (raw)

Papers by Steve Maddox

Research paper thumbnail of Determination of Reddening and Extinction Due to Dust in APM Galaxy Clusters

The Astronomical Journal, 2003

Research paper thumbnail of The local environment of H II galaxies

Monthly Notices of the Royal Astronomical Society, 2000

Research paper thumbnail of Mathematical equations in Braille

Research paper thumbnail of The radio-optical correlation in steep-spectrum quasars

Monthly Notices of the Royal Astronomical Society, 1998

Research paper thumbnail of The APM galaxy survey. II, Photometric corrections

Monthly Notices of the Royal Astronomical Society, 1990

Research paper thumbnail of Abell identifications of APM clusters of galaxies

Mon Notic Roy Astron Soc, 1995

We present identifications of Abell/ACO clusters of galaxies with APM clusters using the metric s... more We present identifications of Abell/ACO clusters of galaxies with APM clusters using the metric separation between the APM clusters' coordinates and the nominal Abell cluster positions at both the APM and the (measured or estimated) Abell cluster redshift. Wherever available, we also take into account the positions of the APM galaxies which have redshift measurements. Finally, chance alignments of physically unrelated APM and ACO clusters at discordant redshifts are removed after visual inspection of the corresponding optical UK Schmidt plates. Our compilation contains only truly physical identifications, and so supersedes the identifications listed by Dalton et al. and also their subsequent erratum, which both contain a significant fraction of chance coincidences between clusters at different distances that appear close together in projection on the sky.

Research paper thumbnail of The Redshift Evolution of Clustering in the HDF

We present a correlation function analysis for the catalogue of photometric redshifts obtained fr... more We present a correlation function analysis for the catalogue of photometric redshifts obtained from the Hubble Deep Field image by Fernandez-Soto et al., 1998. By dividing the catalogue into redshift bins of width Deltaz=0.4\Delta z=0.4Deltaz=0.4 we measured the angular correlation function w(theta)w(\theta)w(theta) as a function of redshift up to zsim4.8z\sim 4.8zsim4.8. From these measurements we derive the trend of the correlation length r_0r_0r0. We find that r0(z)r_0(z)r0(z) is roughly constant with look-back time up to zsimeq2z \simeq 2zsimeq2, and then increases to higher values at zsimgt2.4z\simgt 2.4zsimgt2.4. We estimate the values of r0r_0r0, assuming xi(r,z)=(r/r0(z))−gamma\xi(r,z)=(r/r_0(z))^{-\gamma}xi(r,z)=(r/r0(z))−gamma, gamma=1.8\gamma=1.8gamma=1.8 and different geometries. For Omega0=1\Omega_0=1Omega0=1 we find r0(z=3)simeq7.00pm4.87h−1r_0(z=3)\simeq 7.00\pm 4.87 h^{-1}r_0(z=3)simeq7.00pm4.87h−1 Mpc, in good agreement with the values obtained from analysis of the Lyman Break Galaxies.

Research paper thumbnail of Wide field spectroscopy and the distant universe

Research paper thumbnail of Galaxy Clusters in the APM Survey

Proceedings of the International Astronomical Union, 1988

Research paper thumbnail of View of a Clumpy Universe

Research paper thumbnail of Optical identifications of $ sim 4000$ radio sources at the 1 mJy level

We find that radio galaxies are strongly clustered and highly biased tracers of the underlying ma... more We find that radio galaxies are strongly clustered and highly biased tracers of the underlying mass distribution. Models for the angular correlation function w(theta)w(\theta)w(theta) show good agreement with the observations if we assume a bias factor bsimeq2b\simeq 2bsimeq2 at zsimeq0.3z\simeq 0.3zsimeq0.3.

Research paper thumbnail of The redshift distribution of FIRST radio sources at 1 mJy

Monthly Notices of the Royal Astronomical Society, 2000

Research paper thumbnail of The apparent and intrinsic shape of the APM galaxy clusters

Monthly Notices of the Royal Astronomical Society, 2000

Research paper thumbnail of The redshift evolution of clustering in the Hubble Deep Field

Monthly Notices of the Royal Astronomical Society, 1999

Research paper thumbnail of Star formation, metallicity and dust properties derived from the StromloAPM galaxy survey spectra

Monthly Notices of the Royal Astronomical Society, 2002

Research paper thumbnail of Optical identifications of 4000 radio sources at the 1mJy level

Monthly Notices of the Royal Astronomical Society, 2002

Research paper thumbnail of An imaging survey of a uniform sample of brightest cluster galaxies and intracluster light

Monthly Notices of the Royal Astronomical Society, 2006

Research paper thumbnail of Weak Gravitational Lensing by a Sample of X‐Ray Luminous Clusters of Galaxies. I. The Data Set

The Astrophysical Journal Supplement Series, 2002

Research paper thumbnail of A new upper limit on the total neutrino mass from the 2dF Galaxy Redshift Survey

Phys Rev Lett, 2002

We constrain f_nu = Omega_nu / Omega_m, the fractional contribution of neutrinos to the total mas... more We constrain f_nu = Omega_nu / Omega_m, the fractional contribution of neutrinos to the total mass density in the Universe, by comparing the power spectrum of fluctuations derived from the 2dF Galaxy Redshift Survey with power spectra for models with four components: baryons, cold dark matter, massive neutrinos and a cosmological constant. Adding constraints from independent cosmological probes we find f_nu < 0.13 (at 95% confidence) for a prior of 0.1< Omega_m <0.5, and assuming the scalar spectral index n=1. This translates to an upper limit on the total neutrino mass and m_nu,tot < 1.8 eV for "concordance" values of Omega_m and the Hubble constant. Very similar results are obtained with a prior on Omega_m from Type Ia supernovae surveys, and with marginalization over n.

Research paper thumbnail of The APM Sky Catalogues

Ieee Spectrum, May 30, 1994

The APM Northern Sky Catalogue, a digitised version of the Palomar sky survey, is accessible on-l... more The APM Northern Sky Catalogue, a digitised version of the Palomar sky survey, is accessible on-line.

Research paper thumbnail of Determination of Reddening and Extinction Due to Dust in APM Galaxy Clusters

The Astronomical Journal, 2003

Research paper thumbnail of The local environment of H II galaxies

Monthly Notices of the Royal Astronomical Society, 2000

Research paper thumbnail of Mathematical equations in Braille

Research paper thumbnail of The radio-optical correlation in steep-spectrum quasars

Monthly Notices of the Royal Astronomical Society, 1998

Research paper thumbnail of The APM galaxy survey. II, Photometric corrections

Monthly Notices of the Royal Astronomical Society, 1990

Research paper thumbnail of Abell identifications of APM clusters of galaxies

Mon Notic Roy Astron Soc, 1995

We present identifications of Abell/ACO clusters of galaxies with APM clusters using the metric s... more We present identifications of Abell/ACO clusters of galaxies with APM clusters using the metric separation between the APM clusters' coordinates and the nominal Abell cluster positions at both the APM and the (measured or estimated) Abell cluster redshift. Wherever available, we also take into account the positions of the APM galaxies which have redshift measurements. Finally, chance alignments of physically unrelated APM and ACO clusters at discordant redshifts are removed after visual inspection of the corresponding optical UK Schmidt plates. Our compilation contains only truly physical identifications, and so supersedes the identifications listed by Dalton et al. and also their subsequent erratum, which both contain a significant fraction of chance coincidences between clusters at different distances that appear close together in projection on the sky.

Research paper thumbnail of The Redshift Evolution of Clustering in the HDF

We present a correlation function analysis for the catalogue of photometric redshifts obtained fr... more We present a correlation function analysis for the catalogue of photometric redshifts obtained from the Hubble Deep Field image by Fernandez-Soto et al., 1998. By dividing the catalogue into redshift bins of width Deltaz=0.4\Delta z=0.4Deltaz=0.4 we measured the angular correlation function w(theta)w(\theta)w(theta) as a function of redshift up to zsim4.8z\sim 4.8zsim4.8. From these measurements we derive the trend of the correlation length r_0r_0r0. We find that r0(z)r_0(z)r0(z) is roughly constant with look-back time up to zsimeq2z \simeq 2zsimeq2, and then increases to higher values at zsimgt2.4z\simgt 2.4zsimgt2.4. We estimate the values of r0r_0r0, assuming xi(r,z)=(r/r0(z))−gamma\xi(r,z)=(r/r_0(z))^{-\gamma}xi(r,z)=(r/r0(z))−gamma, gamma=1.8\gamma=1.8gamma=1.8 and different geometries. For Omega0=1\Omega_0=1Omega0=1 we find r0(z=3)simeq7.00pm4.87h−1r_0(z=3)\simeq 7.00\pm 4.87 h^{-1}r_0(z=3)simeq7.00pm4.87h−1 Mpc, in good agreement with the values obtained from analysis of the Lyman Break Galaxies.

Research paper thumbnail of Wide field spectroscopy and the distant universe

Research paper thumbnail of Galaxy Clusters in the APM Survey

Proceedings of the International Astronomical Union, 1988

Research paper thumbnail of View of a Clumpy Universe

Research paper thumbnail of Optical identifications of $ sim 4000$ radio sources at the 1 mJy level

We find that radio galaxies are strongly clustered and highly biased tracers of the underlying ma... more We find that radio galaxies are strongly clustered and highly biased tracers of the underlying mass distribution. Models for the angular correlation function w(theta)w(\theta)w(theta) show good agreement with the observations if we assume a bias factor bsimeq2b\simeq 2bsimeq2 at zsimeq0.3z\simeq 0.3zsimeq0.3.

Research paper thumbnail of The redshift distribution of FIRST radio sources at 1 mJy

Monthly Notices of the Royal Astronomical Society, 2000

Research paper thumbnail of The apparent and intrinsic shape of the APM galaxy clusters

Monthly Notices of the Royal Astronomical Society, 2000

Research paper thumbnail of The redshift evolution of clustering in the Hubble Deep Field

Monthly Notices of the Royal Astronomical Society, 1999

Research paper thumbnail of Star formation, metallicity and dust properties derived from the StromloAPM galaxy survey spectra

Monthly Notices of the Royal Astronomical Society, 2002

Research paper thumbnail of Optical identifications of 4000 radio sources at the 1mJy level

Monthly Notices of the Royal Astronomical Society, 2002

Research paper thumbnail of An imaging survey of a uniform sample of brightest cluster galaxies and intracluster light

Monthly Notices of the Royal Astronomical Society, 2006

Research paper thumbnail of Weak Gravitational Lensing by a Sample of X‐Ray Luminous Clusters of Galaxies. I. The Data Set

The Astrophysical Journal Supplement Series, 2002

Research paper thumbnail of A new upper limit on the total neutrino mass from the 2dF Galaxy Redshift Survey

Phys Rev Lett, 2002

We constrain f_nu = Omega_nu / Omega_m, the fractional contribution of neutrinos to the total mas... more We constrain f_nu = Omega_nu / Omega_m, the fractional contribution of neutrinos to the total mass density in the Universe, by comparing the power spectrum of fluctuations derived from the 2dF Galaxy Redshift Survey with power spectra for models with four components: baryons, cold dark matter, massive neutrinos and a cosmological constant. Adding constraints from independent cosmological probes we find f_nu < 0.13 (at 95% confidence) for a prior of 0.1< Omega_m <0.5, and assuming the scalar spectral index n=1. This translates to an upper limit on the total neutrino mass and m_nu,tot < 1.8 eV for "concordance" values of Omega_m and the Hubble constant. Very similar results are obtained with a prior on Omega_m from Type Ia supernovae surveys, and with marginalization over n.

Research paper thumbnail of The APM Sky Catalogues

Ieee Spectrum, May 30, 1994

The APM Northern Sky Catalogue, a digitised version of the Palomar sky survey, is accessible on-l... more The APM Northern Sky Catalogue, a digitised version of the Palomar sky survey, is accessible on-line.