Rachel Mandelbaum
A5036065830- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Remote Sensing in Agriculture
- Astronomical Observations and Instrumentation
- CCD and CMOS Imaging Sensors
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Advanced Vision and Imaging
- Gaussian Processes and Bayesian Inference
- Statistical and numerical algorithms
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Advanced Statistical Methods and Models
- Plant Water Relations and Carbon Dynamics
- Distributed and Parallel Computing Systems
- History and Developments in Astronomy
- Impact of Light on Environment and Health
- Generative Adversarial Networks and Image Synthesis
Carnegie Mellon University
2016-2025
IBM (United States)
2024
University of Southern California
2022-2023
Institute for Physics
2021-2023
LAC+USC Medical Center
2022
Australian Astronomical Observatory
2020
Macquarie University
2020
Kavli Institute for the Physics and Mathematics of the Universe
2016-2019
The University of Tokyo
2019
Inter-University Centre for Astronomy and Astrophysics
2019
The Sloan Digital Sky Survey (SDSS) started a new phase in August 2008, with instrumentation and surveys focused on Galactic structure chemical evolution, measurements of the baryon oscillation feature clustering galaxies quasar Ly alpha forest, radial velocity search for planets around ~8000 stars. This paper describes first data release SDSS-III (and eighth counting from beginning SDSS). includes five-band imaging roughly 5200 deg^2 Southern Cap, bringing total footprint SDSS to 14,555...
The Baryon Oscillation Spectroscopic Survey (BOSS) is designed to measure the scale of baryon acoustic oscillations (BAO) in clustering matter over a larger volume than combined efforts all previous spectroscopic surveys large-scale structure. BOSS uses 1.5 million luminous galaxies as faint i = 19.9 10,000 deg2 BAO redshifts z < 0.7. Observations neutral hydrogen Lyα forest more 150,000 quasar spectra (g 22) will constrain redshift range 2.15 3.5. Early results from include first detection...
This paper describes the Sixth Data Release of Sloan Digital Sky Survey. With this data release, imaging northern Galactic cap is now complete. The survey contains images and parameters roughly 287 million objects over 9583 deg2, including scans a large range latitudes longitudes. also includes 1.27 spectra stars, galaxies, quasars, blank sky (for subtraction) selected 7425 deg2. release much more stellar spectroscopy than was available in previous releases detailed estimates temperatures,...
This paper describes the Fourth Data Release of Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The release includes five-band photometric for 180 million objects selected over 6670 deg2 and 673,280 spectra galaxies, quasars, stars from 4783 those imaging using standard SDSS target selection algorithms. These numbers represent a roughly 27% increment Third Release; previous releases are included in present release. also an additional 131,840...
Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of 8.2m Subaru telescope summit Maunakea in Hawaii. A team scientists from Japan, Taiwan and Princeton University using HSC to carry out 300-night multi-band survey high-latitude sky. The includes three layers: Wide layer will cover 1400 deg$^2$ five broad bands ($grizy$), with $5\,\sigma$ point-source depth $r \approx 26$. Deep covers total 26~deg$^2$ four fields, going roughly magnitude fainter, while UltraDeep goes...
We present measurements of galaxy clustering from the Baryon Oscillation Spectroscopic Survey (BOSS), which is part Sloan Digital Sky III (SDSS-III). These use Data Release 9 (DR9) CMASS sample, contains 264 283 massive galaxies covering 3275 square degrees with an effective redshift z = 0.57 and range 0.43 < 0.7. Assuming a concordance ΛCDM cosmological model, this sample covers volume 2.2 Gpc3, represents largest Universe ever surveyed at density, . measure angle-averaged correlation...
This paper describes the Fifth Data Release (DR5) of Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through June 2005 and represents completion SDSS-I project (whose successor, SDSS-II will continue mid-2008). It five-band photometric for 217 million objects selected over 8000 square degrees, 1,048,960 spectra galaxies, quasars, stars from 5713 degrees that imaging data. These numbers represent a roughly 20% increment those Fourth Release; previous releases are...
The relationship between galaxies and dark matter can be characterized by the halo mass of central galaxy fraction that are satellites. Here we present observational constraints from SDSS on these quantities as a function r-band luminosity stellar using galaxy-galaxy weak lensing, with total 351,507 lenses. We use masses derived spectroscopy virial gravitational lensing to determine efficiency which baryons in have been converted into stars. find an L* 6x10^{10} M_{sun} is hosted 1.4x10^{12}...
Abstract We measure cosmic weak lensing shear power spectra with the Subaru Hyper Suprime-Cam (HSC) survey first-year catalog covering 137 deg2 of sky. Thanks to high effective galaxy number density ∼17 arcmin−2, even after conservative cuts such as a magnitude cut i &lt; 24.5 and photometric redshift 0.3 ≤ z 1.5, we obtain high-significance measurement in four tomographic bins, achieving total signal-to-noise ratio 16 multipole range 300 ℓ 1900. carefully account for various...
In this paper, we describe the optical imaging data processing pipeline developed for Subaru Telescope's Hyper Suprime-Cam (HSC) instrument. The HSC Pipeline builds on prototype being by Large Synoptic Survey Data Management system, adding customizations HSC, large-scale capabilities, and novel algorithms that have since been reincorporated into LSST codebase. While designed primarily to reduce Strategic Program (SSP) data, it is also recommended reducing general-observer data. includes high...
Recent studies have shown that the cross-correlation coefficient between galaxies and dark matter is very close to unity on scales outside a few virial radii of galaxy haloes, independent details how populate haloes. This finding makes it possible determine clustering from measurements galaxy–galaxy weak lensing clustering. We present new cosmological parameter constraints based large-scale spectroscopic samples Sloan Digital Sky Survey (SDSS) data release 7. generalize approach Baldauf et...
The Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) is a three-layered imaging survey aimed at addressing some of the most outstanding questions in astronomy today, including nature dark matter and energy. has been awarded 300 nights observing time Telescope it started March 2014. This paper presents first public data release HSC-SSP. includes taken 1.7 years observations (61.5 nights) each Wide, Deep, UltraDeep layers covers about 108, 26, 4 square degrees down to depths i~26.4, ~26.5,...
Abstract We present measurements of cosmic shear two-point correlation functions (TPCFs) from Hyper Suprime-Cam Subaru Strategic Program (HSC) first-year data, and derive cosmological constraints based on a blind analysis. The HSC shape catalog is divided into four tomographic redshift bins ranging $z=0.3$ to 1.5 with equal widths $\Delta z =0.3$. unweighted galaxy number densities in each bin are 5.9, 4.3, $2.4\:$arcmin$^{-2}$ the lowest highest redshifts, respectively. adopt standard TPCF...
We present high signal-to-noise galaxy–galaxy lensing measurements of the Baryon Oscillation Spectroscopic Survey constant mass (CMASS) sample using 250 deg2 weak-lensing data from Canada–France–Hawaii Telescope Lensing and Stripe 82 Survey. compare this signal with predictions mock catalogues trained to match observables including stellar function projected two-dimensional clustering CMASS. show that CMASS, together standard models galaxy–halo connection, robustly predicts a is 20–40 per...
We measure weak lensing cosmic shear power spectra from the 3-year galaxy catalog of Hyper Suprime-Cam (HSC) Subaru Strategic Program imaging survey. The covers 416 deg2 northern sky, with a mean i-band seeing 0.59 arcsec and an effective number density 15 arcmin−2 within our adopted redshift range. With magnitude limit 24.5 mag, four tomographic bins spanning 0.3≤zph≤1.5 based on photometric redshifts, we obtain high-significance measurement spectra, signal-to-noise ratio approximately 26.4...
We perform a blinded cosmology analysis with cosmic shear two-point correlation functions measured from more than 25 million galaxies in the Hyper Suprime-Cam three-year catalog four tomographic redshift bins ranging 0.3 to 1.5. After conservative masking and galaxy selection, survey covers 416 deg2 of northern sky an effective number density 15 arcmin−2 over bins. The 2PCFs adopted for are angular range; 7.1<θ/arcmin<56.6 ξ+ 31.2<θ/arcmin<248 ξ−, total signal-to-noise ratio 26.6. apply...
The Shear TEsting Programme (STEP) is a collaborative project to improve the accuracy and reliability of weak lensing measurement, in preparation for next generation wide-field surveys. We review sixteen current emerging shear measurement methods common language, assess their performance by running them (blindly) on simulated images that contain known signal. determine features algorithms most successfully recover input parameters. achieve previously unattained discriminatory precision our...
Correlations between intrinsic shear and the density field on large scales, a potentially important contaminant for cosmic surveys, have been robustly detected at low redshifts with bright galaxies in Sloan Digital Sky Survey (SDSS) data. Here we present more detailed characterization of this effect, which can cause anticorrelations gravitational lensing ellipticity (GI correlations). This measurement uses 36 278 luminous red (LRGs) from SDSS spectroscopic sample 0.15 < z 0.35, split by...
Correlations between the intrinsic shapes of galaxies and large-scale galaxy density field provide an important tool to investigate alignments, which constitute a major astrophysical systematic in cosmological weak lensing (cosmic shear) surveys, but also yield insight into formation evolution galaxies. We measure position-shape correlations MegaZ-LRG sample for more than 800,000 luminous red galaxies, making first such measurement with photometric redshift sample. In combination re-analysis...
We present results of a measurement the shape density profile galaxy groups and clusters traced by 43 335 Luminous Red Galaxies (LRGs) with spectroscopic redshifts from Sloan Digital Sky Survey (SDSS). The galaxies are selected such that they brightest within cylindrical aperture, split into two luminosity samples, modeled as sum stellar dark matter components. detailed investigation many possible systematic effects could contaminate our signal develop methods to remove them, including...
Weak lensing is emerging as a powerful observational tool to constrain cosmological models, but at present limited by an incomplete understanding of many sources systematic error. Many these errors are multiplicative and depend on the population background galaxies. We show how commonly cited geometric test, which rather insensitive cosmology, can be used ratio test systematics in signal 1 per cent level. apply this galaxy-galaxy analysis Sloan Digital Sky Survey (SDSS), sample with highest...
We perform a statistical weak lensing analysis of dark matter profiles around tracers halo mass from galactic- to cluster-size halos. In this we use 170,640 isolated ~L* galaxies split into ellipticals and spirals, 38,236 groups traced by spectroscopic Luminous Red Galaxies (LRGs) 13,823 MaxBCG clusters the Sloan Digital Sky Survey (SDSS) covering wide range richness. Together these three samples allow determination density halos over orders magnitude in mass, 10^{12} M_{sun} 10^{15}...
We present a new measurement of the optical Quasar Luminosity Function (QLF), using data from Sloan Digital Sky Survey-III: Baryon Oscillation Spectroscopic Survey (SDSS-III: BOSS). From SDSS-III Data Release Nine (DR9), we select uniform sample 22,301 i<=21.8 quasars over an area 2236 sq. deg with confirmed spectroscopic redshifts between 2.2<z<3.5, filling in key part luminosity-redshift plane for quasar studies. derive completeness survey through simulated photometry, and check this...