B. R. Saliwanchik
A5057415907- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Radio Wave Propagation Studies
- Astronomical Observations and Instrumentation
- Antenna Design and Optimization
- Scientific Research and Discoveries
- Astrophysics and Star Formation Studies
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Physics of Superconductivity and Magnetism
- Electromagnetic Compatibility and Measurements
- History and Developments in Astronomy
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- Planetary Science and Exploration
Case Western Reserve University
2014-2025
Brookhaven National Laboratory
2020-2024
Yale University
2019-2023
Brookhaven College
2021
University of KwaZulu-Natal
2016-2019
Kavli Institute for Particle Astrophysics and Cosmology
2016
Lawrence Berkeley National Laboratory
2015
University of Chicago
2012-2014
Cardiff University
2012
University of California, Berkeley
2012
We present a catalog of galaxy clusters selected via their Sunyaev-Zel'dovich (SZ) effect signature from 2500 deg$^2$ South Pole Telescope (SPT) data. This work represents the complete sample detected at high significance in 2500-square-degree SPT-SZ survey, which was completed 2011. A total 677 (409) cluster candidates are identified above signal-to-noise threshold $\xi$ =4.5 (5.0). Ground- and space-based optical near-infrared (NIR) imaging confirms overdensities similarly colored galaxies...
We describe the design of a new polarization sensitive receiver, spt-3g, for 10-meter South Pole Telescope (spt). The spt-3g receiver will deliver factor ~20 improvement in mapping speed over current spt-pol. sensitivity enable advance from statistical detection B-mode anisotropy power to high signal-to-noise measurements individual modes, i.e., maps. This lead precise (~0.06 eV) constraints on sum neutrino masses with potential directly address mass hierarchy. It allow separation lensing...
Gravitational lensing of the cosmic microwave background generates a curl pattern in observed polarization. This "B-mode" signal provides measure projected mass distribution over entire observable Universe and also acts as contaminant for measurement primordial gravity-wave signals. In this Letter we present first detection gravitational B modes, using first-season data from polarization-sensitive receiver on South Pole Telescope (SPTpol). We construct template B-mode by combining E-mode...
(abridged) We present cosmological constraints obtained from galaxy clusters identified by their Sunyaev-Zel'dovich effect signature in the 2500 square degree South Pole Telescope Sunyaev Zel'dovich survey. consider 377 cluster candidates at z>0.25 with a detection significance greater than five, corresponding to 95% purity threshold for compute on models using measured abundance as function of mass and redshift. include additional multi-wavelength observations, including Chandra X-ray data...
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a new 400-800MHz radio interferometer under development for deployment in South Africa. HIRAX will comprise 1024 six meter parabolic dishes on compact grid map most of the southern sky over course four years. has two primary science goals: to constrain Dark Energy measure structure at high redshift, study transients pulsars. observe unresolved sources neutral hydrogen via their redshifted 21-cm emission line (`hydrogen...
We present a catalog of galaxy cluster candidates, selected through their Sunyaev–Zel'dovich (SZ) effect signature in the first 720 deg2 South Pole Telescope (SPT) survey. This area was mapped with SPT 2008 and 2009 austral winters to depth ∼18 μKCMB-arcmin at 150 GHz; 550 it also ∼44 95 GHz. Based on optical imaging all 224 candidates near-infrared majority we have found and/or infrared counterparts for 158, which then classify as confirmed clusters. Of these 158 clusters, 135 were...
We use measurements from the South Pole Telescope (SPT) Sunyaev Zel'dovich (SZ) cluster survey in combination with X-ray to constrain cosmological parameters. present a statistical method that fits for scaling relations of SZ and observables mass while jointly fitting cosmology. The is generalizable multiple observables, self-consistently accounts effects selection uncertainties calibration on derived constraints. apply this data set consisting an SZ-selected catalog 18 galaxy clusters at z...
We present measurements of the $E$-mode polarization angular auto-power spectrum ($EE$) and temperature-$E$-mode cross-power ($TE$) cosmic microwave background (CMB) using 150 GHz data from three seasons SPTpol observations. report power spectra over spherical harmonic multipole range $50 < \ell \leq 8000$, detect nine acoustic peaks in $EE$ with high signal-to-noise ratio. These are most sensitive to date $TE$ at $\ell > 1050$ 1475$, respectively. The observations cover 500 deg$^2$, a...
Following the first two annual intensity mapping workshops at Stanford in March 2016 and Johns Hopkins June 2017, we report on recent advances theory, instrumentation observation that were presented these meetings some of opportunities challenges identified looking forward. With preliminary detections CO, [CII], Lya low-redshift 21cm, a host experiments set to go online next few years, field is rapidly progressing all fronts, with great anticipation for flood new exciting results. This...
The South Pole Telescope (SPT) is currently surveying 2500 deg^2 of the southern sky to detect massive galaxy clusters out epoch their formation using Sunyaev-Zel'dovich (SZ) effect. This paper presents a catalog 26 most significant SZ cluster detections in full survey region. includes 14 which have been previously identified and 12 that are new discoveries. These were fields observed two differing noise depths: 1500 at final SPT depth 18 uK-arcmin 150 GHz, 1000 54 uK-arcmin. Clusters...
We present first results on the cooling properties derived from Chandra X-ray observations of 83 high-redshift (0.3 < z 1.2) massive galaxy clusters selected by their Sunyaev–Zel'dovich signature in South Pole Telescope data. measure each cluster's central time, entropy, and mass deposition rate, compare these to those for local cluster samples. find no significant evolution ∼ 0 1 distribution properties, suggesting that cores is stable over long periods time. also average cool core entropy...
We present a velocity dispersion-based mass calibration of the South Pole Telescope Sunyaev-Zel'dovich effect survey (SPT-SZ) galaxy cluster sample. Using homogeneously selected sample 100 candidates from 720 deg2 along with 63 dispersion ($\sigma_v$) and 16 X-ray Yx measurements clusters, we simultaneously calibrate mass-observable relation constrain cosmological parameters. The calibrations using $\sigma_v$ are consistent at $0.6\sigma$ level, preferring ~16% higher masses. use full...
We present a measurement of the $B$-mode polarization power spectrum (the $BB$ spectrum) from 100 $\mathrm{deg}^2$ sky observed with SPTpol, polarization-sensitive receiver currently installed on South Pole Telescope. The observations used in this work were taken during 2012 and early 2013 include data spectral bands centered at 95 150 GHz. report five bins multipole space, spanning range $300 \le \ell 2300$, for three combinations: GHz $\times$ GHz, subtract small ($< 0.5 \sigma$ units...
We derive cosmological constraints using a galaxy cluster sample selected from the 2500~deg$^2$ SPT-SZ survey. The spans redshift range $0.25< z<1.75$ and contains 343 clusters with SZ detection significance $\xi>5$. is supplemented optical weak gravitational lensing measurements of 32 $0.29<z<1.13$ (from Magellan HST) X-ray 89 $0.25<z<1.75$ Chandra). rely on minimal modeling assumptions: i) provides an accurate means measuring halo masses, ii) mean observables are related to true mass...
SPTpol is a dual-frequency polarization-sensitive camera that was deployed on the 10-meter South Pole Telescope in January 2012. will measure polarization anisotropy of cosmic microwave background (CMB) angular scales spanning an arcminute to several degrees. The sensitivity enable detection CMB “B-mode” from gravitational lensing by large scale structure, and or improved upper limit primordial signal due inationary gravity waves. two measurements can be used constrain sum neutrino masses...
We measure the cross-correlation between galaxy density in Dark Energy Survey (DES) Science Verification data and lensing of cosmic microwave background (CMB) as reconstructed with Planck satellite South Pole Telescope (SPT). When using DES main sample over full redshift range 0.2 < zphot 1.2, a signal is detected at 6σ 4σ SPT , respectively. then divide galaxies into five photometric bins, finding significant (>2σ) detections all bins. Comparing to fiducial cosmology, we find evolution...
We present the results of ground- and space-based optical near-infrared (NIR) follow-up 224 galaxy cluster candidates detected with Sunyaev-Zel'dovich (SZ) effect in 720 deg^2 South Pole Telescope (SPT) survey completed 2008 2009 observing seasons. use optical/NIR data to establish whether each candidate is associated an overdensity galaxies estimate redshift. Most photometric redshifts are derived through a combination three different redshift estimators using red-sequence galaxies,...
We detect the kinematic Sunyaev-Zel'dovich (kSZ) effect with a statistical significance of 4.2σ by combining cluster catalogue derived from first year data Dark Energy Survey cosmic microwave background temperature maps South Pole Telescope Survey. This measurement is performed differential statistic that isolates pairwise kSZ signal, providing detection large-scale, motion clusters using redshifts photometric data. By fitting signal to theoretical template, we measure average central...
Abstract We present a measurement of the cosmic microwave background lensing potential using 500 deg 2 150 GHz data from SPTpol receiver on South Pole Telescope. The is reconstructed with signal-to-noise per mode greater than unity at multipoles L ≲ 250, quadratic estimator combination temperature and polarization maps. report measurements power spectrum in multipole range 100 < 2000 sets temperature-only ( T ), polarization-only (POL), minimum-variance (MV) estimators. measure amplitude...
We report a B-mode power spectrum measurement from the cosmic microwave background (CMB) polarization anisotropy observations made using SPTpol instrument on South Pole Telescope. This work uses 500 deg$^2$ of data, five-fold increase over last release. As result, bandpower uncertainties have been reduced by more than factor two, and extends to lower multipoles: $52 < \ell 2301$. Data both 95 150 GHz are used, allowing for three cross-spectra: x GHz, GHz. is detected at very high...
Abstract We present cosmological constraints based on the cosmic microwave background (CMB) lensing potential power spectrum measurement from recent 500 deg 2 SPTpol survey, most precise CMB ground to date. fit a flat ΛCDM model reconstructed alone and in addition with other data sets: baryon acoustic oscillations (BAO), as well primary spectra Planck . The band powers are good agreement when analyzed combination full-sky data. With weak priors density parameters, provide 4% constraint...
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a radio interferometer array currently in development, with an initial 256-element to be deployed at the South African Radio Astronomy Observatory (SARAO) Square Kilometer Array (SKA) site Africa. Each of 6m, $f/0.23$ dishes will instrumented dual-polarisation feeds operating over frequency range 400-800 MHz. Through intensity mapping 21 cm emission line neutral hydrogen, HIRAX provide cosmological survey distribution...
Using the South Pole Telescope (SPT), we have discovered most massive known galaxy cluster at z > 1, SPT-CL J2106-5844. In addition to producing a strong Sunyaev-Zel'dovich effect signal, this system is luminous X-ray source and its numerous constituent galaxies display spatial color clustering, all indicating presence of cluster. VLT Magellan spectroscopy 18 member shows that = 1.132^+0.002_-0.003. Chandra observations obtained through combined HRC-ACIS GTO program reveal an spectrum with...
We compare cosmic microwave background lensing convergence maps derived from South Pole Telescope (SPT) data with galaxy survey the Blanco Cosmology Survey, Wide-field Infrared Survey Explorer, and a new large Spitzer/IRAC field designed to overlap SPT survey. Using optical infrared catalogs covering between 17 68 square degrees of sky, we detect correlation each density at >4 sigma, zero cross-correlation robustly ruled out in all cases. The amplitude shape cross-power spectra are good...