Cosmological hydrogen recombination: The effect of extremely high-n states (2009)
Grin, Daniel, Hirata, Christopher M.
Calculations of cosmological hydrogen recombination are vital for the extraction of cosmological parameters from cosmic microwave background (CMB) observations, and for imposing constraints to...
Tidal alignments as a contaminant of redshift space distortions (2009)
We investigate the effect of orientation-dependent selection effects on galaxy clustering in redshift space. It is found that if galaxies are aligned by large-scale tidal fields, then these selection...
Krause, Elisabeth, Hirata, Christopher M.
It is usually assumed that the ellipticity power spectrum measured in weak lensing observations can be expressed as an integral over the underlying matter power spectrum. This is true at second order...
The GMRT EoR experiment: limits on polarized sky brightness at 150 MHz (2009)
Pen, Ue-Li, Chang, Tzu-Ching, Hirata, Christopher M., Peterson, Jeffrey B., Roy, Jayanta, Gupta, Yashwant, ...
The Giant Metrewave Radio Telescope (GMRT) reionization effort aims to map out the large-scale structure of the Universe during the epoch of reionization (EoR). Removal of polarized Galactic emission...
Constraints on cosmic hemispherical power anomalies from quasars (2009)
Recent analyses of the cosmic microwave background (CMB) maps from the WMAP satellite have uncovered evidence for a hemispherical power anomaly, i.e. a dipole modulation of the CMB power spectrum at...
Lyman-alpha transfer in primordial hydrogen recombination (2009)
Hirata, Christopher M., Forbes, John
Cosmological constraints from the cosmic microwave background (CMB) anisotropies rely on accurate theoretical calculations of the cosmic recombination history. Recent work has emphasized the...
Constraints on cosmic hemispherical power anomalies from quasars (2009)
Recent analyses of the cosmic microwave background (CMB) maps from the WMAP satellite have uncovered evidence for a hemispherical power anomaly, i.e. a dipole modulation of the CMB power spectrum at...
A Scale-Dependent Power Asymmetry from Isocurvature Perturbations (2009)
Erickcek, Adrienne L., Hirata, Christopher M., Kamionkowski, Marc
If the hemispherical power asymmetry observed in the cosmic microwave background (CMB) on large angular scales is attributable to a superhorizon curvaton fluctuation, then the simplest model predicts...
Luminous Red Galaxy Population in Clusters at 0.2≤ z ≤0.6 (2009)
Ho, Shirley, Lin, Yen-Ting, Spergel, David, Hirata, Christopher M.
We investigate statistical properties of luminous red galaxies (LRGs) in a sample of X-ray-selected galaxy clusters at intermediate redshift (0.2 ≤ z ≤ 0.6) of mass range from ~1 × 10^(14) M_☉...
A refined model for spinning dust radiation (2009)
Ali-Haïmoud, Yacine, Hirata, Christopher M., Dickinson, Clive
We present a comprehensive treatment of the spectrum of electric dipole emission from spinning dust grains, updating the commonly used model of Draine & Lazarian. Grain angular velocity distributions...
Lyman-alpha transfer in primordial hydrogen recombination (2009)
Hirata, Christopher M., Forbes, John
Cosmological constraints from the cosmic microwave background (CMB) anisotropies rely on accurate theoretical calculations of the cosmic recombination history. Recent work has emphasized the...
Tidal alignments as a contaminant of redshift space distortions (2009)
We investigate the effect of orientation-dependent selection effects on galaxy clustering in redshift space. It is found that if galaxies are aligned by large-scale tidal fields, then these selection...
Correlation of CMB with large-scale structure. II. Weak lensing (2008)
Hirata, Christopher M., Ho, Shirley, Padmanabhan, Nikhil, Seljak, Uroš, Bahcall, Neta A.
We investigate the correlation of gravitational lensing of the cosmic microwave background (CMB) with several tracers of large-scale structure, including luminous red galaxies (LRGs), quasars, and...
A halo mass—concentration relation from weak lensing (2008)
Mandelbaum, Rachel, Seljak, Uroš, Hirata, Christopher M.
We perform a statistical weak lensing analysis of dark matter profiles around tracers of halo mass from galaxy-size to cluster-size halos. In this analysis we use 170 640 isolated ∼L∗ galaxies...
Two-photon transitions in primordial hydrogen recombination (2008)
The subject of cosmological hydrogen recombination has received much attention recently because of its importance to predictions for and cosmological constraints from cosmic microwave background...
The GMRT EoR Experiment: Limits on Polarized Sky Brightness at 150 MHz (2008)
Pen, Ue-Li, Chang, Tzu-Ching, Peterson, Jeffrey B., Roy, Jayanta, Gupta, Yashwant, Hirata, Christopher M., ...
The GMRT reionization effort aims to map out the large scale structure of the Universe during the epoch of reionization (EoR). Removal of polarized Galactic emission is a difficult part of any 21 cm...
Halo mass - concentration relation from weak lensing (2008)
Mandelbaum, Rachel, Seljak, Uros, Hirata, Christopher M.
We perform a statistical weak lensing analysis of dark matter profiles around tracers of halo mass from galactic- to cluster-size halos. In this analysis we use 170,640 isolated ~L* galaxies split...
Primordial helium recombination. I. Feedback, line transfer, and continuum opacity (2008)
Switzer, Eric R., Hirata, Christopher M.
Precision measurements of the cosmic microwave background temperature anisotropy on scales ℓ>500 will be available in the near future. Successful interpretation of these data is dependent on a...
Primordial helium recombination. II. Two-photon processes (2008)
Hirata, Christopher M., Switzer, Eric R.
Interpretation of precision measurements of the cosmic microwave background (CMB) will require a detailed understanding of the recombination era, which determines such quantities as the acoustic...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Prieto, Carlos Allende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
Two-photon transitions in primordial hydrogen recombination (2008)
The subject of cosmological hydrogen recombination has received much attention recently because of its importance to predictions for and cosmological constraints from CMB observations. While the...
Improved optical mass tracer for galaxy clusters calibrated using weak lensing measurements (2008)
Reyes, Reinabelle, Mandelbaum, Rachel, Hirata, Christopher M., Bahcall, Neta, Seljak, Uros
We develop an improved mass tracer for clusters of galaxies from optically observed parameters, and calibrate the mass relation using weak gravitational lensing measurements. We employ a sample of ~...
Ho, Shirley, Hirata, Christopher M., Padmanabhan, Nikhil, Seljak, Uros, Bahcall, Neta
We cross-correlate large scale structure (LSS) observations from a number of surveys with CMB anisotropies from WMAP to investigate the Integrated Sachs-Wolfe (ISW) effect as a function of redshift,...
Correlation of CMB with large-scale structure: II. Weak lensing (2008)
Hirata, Christopher M., Ho, Shirley, Padmanabhan, Nikhil, Seljak, Uros, Bahcall, Neta
We investigate the correlation of gravitational lensing of the cosmic microwave background (CMB) with several tracers of large-scale structure, including luminous red galaxies (LRGs), quasars, and...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the sloan digital sky survey (2008)
Adelman-McCarthy, Jennifer K., Agüros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, Anderson, Kurt S. J., Anderson, Scott F., ...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
Luminous Red Galaxy Population in Clusters at $0.2\le z\le 0.6$ (2007)
Ho, Shirley, Lin, Yen-Ting, Spergel, David, Hirata, Christopher M.
We investigate statistical properties of LRGs in a sample of X-ray selected galaxy clusters at intermediate redshift ($0.2\le z\le0.6$). The LRGs are selected based on carefully designed color...
Primordial helium recombination I: feedback, line transfer, and continuum opacity (2007)
Switzer, Eric R., Hirata, Christopher M.
Precision measurements of the cosmic microwave background temperature anisotropy on scales $\ell > 500$ will be available in the near future. Successful interpretation of these data is dependent on a...
Primordial helium recombination II: two-photon processes (2007)
Hirata, Christopher M., Switzer, Eric R.
Interpretation of precision measurements of the cosmic microwave background (CMB) will require a detailed understanding of the recombination era, which determines such quantities as the acoustic...
Switzer, Eric R., Hirata, Christopher M.
Upcoming precision measurements of the temperature anisotropy of the cosmic microwave background (CMB) at high multipoles will need to be complemented by a more complete understanding of...
Hirata, Christopher M., Mandelbaum, Rachel, Ishak, Mustapha, Seljak, Uros, Nichol, Robert, Pimbblet, Kevin A., ...
Correlations between intrinsic shear and the density field on large scales, a potentially important contaminant for cosmic shear surveys, have been robustly detected at low redshifts with bright...
The fifth data release of the sloan digital sky survey (2007)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The fifth data release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The fifth data release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
Cosmological production of H_2 before the formation of the first galaxies (2006)
Hirata, Christopher M., Padmanabhan, Nikhil
Previous calculations of the pregalactic chemistry have found that a small amount of H_2, x[H_2]=n[H_2]/n[H] = 2.6e-6, is produced catalytically through the H^-, H_2^+, and HeH^+ mechanisms. We...
Density profiles of galaxy groups and clusters from SDSS galaxy-galaxy weak lensing (2006)
Mandelbaum, Rachel, Seljak, Uros, Cool, Richard J., Blanton, Michael, Hirata, Christopher M., Brinkmann, Jonathan
We present results of a measurement of the shape of the density profile of galaxy groups and clusters traced by 43 335 Luminous Red Galaxies (LRGs) with spectroscopic redshifts from the Sloan Digital...
The Spin-Resolved Atomic Velocity Distribution and 21-cm Line Profile of Dark-Age Gas (2006)
Hirata, Christopher M., Sigurdson, Kris
The 21-cm hyperfine line of atomic hydrogen (HI) is a promising probe of the cosmic dark ages. In past treatments of 21-cm radiation it was assumed the hyperfine level populations of HI could be...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The Fourth Data Release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
Detectability of tensor modes in the presence of foregrounds (2005)
Amarie, Mihail, Hirata, Christopher M., Seljak, Uroš
In inflationary models gravitational waves are produced in the early universe and generate B-type polarization in the cosmic microwave background (CMB). Since B polarization is only generated by...
Mandelbaum, Rachel, Seljak, Uros, Kauffmann, Guinevere, Hirata, Christopher M., Brinkmann, Jonathan
The relationship between galaxies and dark matter can be characterized by the halo mass of the central galaxy and the fraction of galaxies that are satellites. Here we present observational...
Can superhorizon cosmological perturbations explain the acceleration of the universe? (2005)
Hirata, Christopher M., Seljak, Uroš
We investigate the recent suggestions by Barausse et al. and Kolb et al. that the acceleration of the universe could be explained by large superhorizon fluctuations generated by inflation. We show...
Switzer, Eric R., Hirata, Christopher M.
It has been suggested that secondary CMB anisotropies generated by neutral lithium could open a new observational window into the universe around the redshift z~400, and permit a determination of the...
Mandelbaum, Rachel, Hirata, Christopher M., Ishak, Mustapha, Seljak, Uros, Brinkmann, Jonathan
The power spectrum of weak lensing shear caused by large-scale structure is an emerging tool for precision cosmology, in particular for measuring the effects of dark energy on the growth of structure...
Wouthuysen-Field coupling strength and application to high-redshift 21 cm radiation (2005)
The first UV sources in the universe are expected to have coupled the HI spin temperature to the gas kinetic temperature via scattering in the Lyman-alpha resonance [the Wouthuysen-Field (WF)...
Switzer, Eric R., Hirata, Christopher M.
It has been suggested that secondary CMB anisotropies generated by neutral lithium could open a new observational window into the universe around the redshift z ~ 400, and permit a determination of...
Ellipticity of dark matter halos with galaxy-galaxy weak lensing (2005)
Mandelbaum, Rachel, Hirata, Christopher M., Broderick, Tamara, Seljak, Uros, Brinkmann, Jonathan
We present the results of attempts to detect the ellipticity of dark matter halos using galaxy-galaxy weak lensing with SDSS data. We use 2,020,256 galaxies brighter than r=19 with photometric...
Can superhorizon cosmological perturbations explain the acceleration of the universe? (2005)
Hirata, Christopher M., Seljak, Uros
We investigate the recent suggestions by Barausse et al. (astro-ph/0501152) and Kolb et al. (hep-th/0503117) that the acceleration of the universe could be explained by large superhorizon...
CMB B-mode polarization from Thomson scattering in the local universe (2005)
Hirata, Christopher M., Loeb, Abraham, Afshordi, Niayesh
The polarization of the cosmic microwave background (CMB) is widely recognized as a potential source of information about primordial gravitational waves. The gravitational wave contribution can be...
Ishak, Mustapha, Hirata, Christopher M.
Weak lensing is a potentially robust and model-independent cosmological probe, but its accuracy is dependent on knowledge of the redshift distribution of the source galaxies used. The most robust way...
Systematic errors in weak lensing: application to SDSS galaxy-galaxy weak lensing (2005)
Mandelbaum, Rachel, Hirata, Christopher M., Seljak, Uros, Guzik, Jacek, Padmanabhan, Nikhil, Blake, Cullen, ...
Weak lensing is emerging as a powerful observational tool to constrain cosmological models, but is at present limited by an incomplete understanding of many sources of systematic error. Many of these...
CMB B-mode polarization from Thomson scattering in the local universe (2005)
Hirata, Christopher M., Loeb, Abraham, Afshordi, Niayesh
[Abridged] The polarization of the CMB is widely recognized as a potential source of information about primordial gravitational waves. The gravitational wave contribution can be separated from the...
Correlating the CMB with Luminous Red Galaxies : The Integrated Sachs-Wolfe Effect (2004)
Padmanabhan, Nikhil, Hirata, Christopher M., Seljak, Uros, Schlegel, David, Brinkmann, Jonathan, Schneider, Donald P.
We present a 2.5 sigma detection of the Integrated Sachs-Wolfe (ISW) effect and discuss the constraints it places on cosmological parameters. We cross-correlate microwave temperature maps from the...
Intrinsic alignment-lensing interference as a contaminant of cosmic shear (2004)
Hirata, Christopher M., Seljak, Uroš
Cosmic shear surveys have great promise as tools for precision cosmology, but can be subject to systematic errors including intrinsic ellipticity correlations of the source galaxies. The intrinsic...
Intrinsic alignment-lensing interference as a contaminant of cosmic shear (2004)
Hirata, Christopher M., Seljak, Uros
Cosmic shear surveys have great promise as tools for precision cosmology, but can be subject to systematic errors including intrinsic ellipticity correlations of the source galaxies. The intrinsic...
Cross-correlation of CMB with large-scale structure: weak gravitational lensing (2004)
Hirata, Christopher M., Padmanabhan, Nikhil, Seljak, Uros, Schlegel, David, Brinkmann, Jonathan
We present the results of a search for gravitational lensing of the cosmic microwave background (CMB) in cross-correlation with the projected density of luminous red galaxies (LRGs). The CMB lensing...
Spectroscopic source redshifts and parameter constraints from weak lensing and CMB (2004)
Ishak, Mustapha, Hirata, Christopher M.
Weak lensing is a potentially robust and model-independent cosmological probe, but its accuracy is dependent on knowledge of the redshift distribution of the source galaxies used. The most robust way...
Weak lensing and CMB: Parameter forecasts including a running spectral index (2004)
Ishak, Mustapha, Hirata, Christopher M., McDonald, Patrick, Seljak, Uroš
We use statistical inference theory to explore the constraints from future galaxy weak lensing (cosmic shear) surveys combined with the current CMB constraints on cosmological parameters, focusing...
Galaxy-galaxy weak lensing in SDSS: intrinsic alignments and shear calibration errors (2004)
Hirata, Christopher M., Mandelbaum, Rachel, Seljak, Uros, Guzik, Jacek, Padmanabhan, Nikhil, Blake, Cullen, ...
Galaxy-galaxy lensing has emerged as a powerful probe of the dark matter halos of galaxies, but is subject to contamination if intrinsically aligned satellites of the lens galaxy are used as part of...
Reconstruction of lensing from the cosmic microwave background polarization (2003)
Hirata, Christopher M., Seljak, Uroš
Gravitational lensing of the cosmic microwave background (CMB) polarization field has been recognized as a potentially valuable probe of the cosmological density field. We apply likelihood-based...
Gravitational lensing as a contaminant of the gravity wave signal in CMB (2003)
Seljak, Uros, Hirata, Christopher M.
Gravity waves (GW) in the early universe generate B-type polarization in the cosmic microwave background (CMB), which can be used as a direct way to measure the energy scale of inflation....
Weak Lensing and CMB: Parameter forecasts including a running spectral index (2003)
Ishak, Mustapha, Hirata, Christopher M., McDonald, Patrick, Seljak, Uros
We use statistical inference theory to explore the constraints from future galaxy weak lensing (cosmic shear) surveys combined with the current CMB constraints on cosmological parameters, focusing...
Reconstruction of lensing from the cosmic microwave background polarization (2003)
Hirata, Christopher M., Seljak, Uros
Gravitational lensing of the cosmic microwave background (CMB) polarization field has been recognized as a potentially valuable probe of the cosmological density field. We apply likelihood-based...
Analyzing weak lensing of the cosmic microwave background using the likelihood function (2003)
Hirata, Christopher M., Seljak, Uroš
Future experiments will produce high-resolution temperature maps of the cosmic microwave background (CMB) and are expected to reveal the signature of gravitational lensing by intervening large-scale...
Shear calibration biases in weak lensing surveys (2003)
Hirata, Christopher M., Seljak, Uros
We investigate biases induced by the conversion between the observed image shape to shear distortion in current weak lensing analysis methods. Such overall calibration biases cannot be detected by...
Analyzing weak lensing of the cosmic microwave background using the likelihood function (2002)
Hirata, Christopher M., Seljak, Uros
Future experiments will produce high-resolution temperature maps of the cosmic microwave background (CMB) and are expected to reveal the signature of gravitational lensing by intervening large-scale...