A5048030159- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Geomagnetism and Paleomagnetism Studies
- Scientific Research and Discoveries
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Astrophysics and Cosmic Phenomena
- Surface Roughness and Optical Measurements
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Satellite Image Processing and Photogrammetry
- Advanced Measurement and Metrology Techniques
- Drilling and Well Engineering
- Radio Astronomy Observations and Technology
- Oil and Gas Production Techniques
- Advanced Optical Sensing Technologies
- Reservoir Engineering and Simulation Methods
- Geophysics and Gravity Measurements
- Infrared Target Detection Methodologies
- Solar and Space Plasma Dynamics
National Institute of Technology Warangal
2023
California Institute of Technology
2018-2021
Infrared Processing and Analysis Center
2018-2020
Indian Institute of Technology Bhilai
2020
Solutions Inc. (Japan)
2020
University of Pittsburgh
2015-2018
GIET University
2016
Ohio University
2013
Indian Institute of Technology Delhi
1975-1980
Cornell University
1975
We present the cosmological implications from final measurements of clustering using galaxies, quasars, and Ly$\alpha$ forests completed Sloan Digital Sky Survey (SDSS) lineage experiments in large-scale structure. These experiments, composed data SDSS, SDSS-II, BOSS, eBOSS, offer independent baryon acoustic oscillation (BAO) angular-diameter distances Hubble relative to sound horizon, $r_d$, eight different samples six growth rate parameter, $f\sigma_8$, redshift-space distortions (RSD)....
We describe new implementations of leptonic and hadronic models for the broadband emission from relativistic jets in AGN a temporary steady state. For model, equilibrium between particle injection/acceleration, radiative cooling, escape spherical region is evaluated, self-consistent output calculated. adiabatic evaluated both primary electrons protons. A new, semi-analytical method to evaluate cascades initiated by internal gamma-gamma pair production presented. use our codes fit snap-shot...
We present measurements of the Baryon Acoustic Oscillation (BAO) scale in redshift-space using clustering quasars. consider a sample 147 000 quasars from extended Spectroscopic Survey (eBOSS) distributed over 2044 square degrees with redshifts 0.8 < z 2.2 and measure their spherically averaged both configuration Fourier space. Our observational data set 1400 simulated realizations allow us to detect preference for BAO that is greater than 2.8σ. determine distance = 1.52 3.8 per cent...
Abstract The extended Baryon Oscillation Spectroscopic Survey (eBOSS) Data Release 14 sample includes 80,118 luminous red galaxies (LRGs). By combining these with the high-redshift tail of BOSS galaxy sample, we form a LRGs at an effective redshift z = 0.72, covering volume 0.9 Gpc 3 . We account for spurious fluctuations caused by targeting and failures, which were validated on set mock catalogs. This analysis is sufficient to provide 2.5% measurement spherically averaged baryon acoustic...
We present measurements of the redshift-dependent clustering a DESI-like luminous red galaxy (LRG) sample selected from Legacy Survey imaging dataset, and use halo occupation distribution (HOD) framework to fit signal. The photometric LRG in this study contains 2.7 million objects over redshift range $0.4 < z 0.9$ 5655 deg$^2$. have developed new (photo-$z$) estimates using DECam WISE photometry, with $\sigma_{\mathrm{NMAD}} = 0.02$ precision for LRGs. compute projected correlation function...
As part of the Sloan Digital Sky Survey (SDSS) IV extended Baryon Oscillation Spectroscopic (eBOSS) will improve measurements cosmological distance scale by applying Acoustic (BAO) method to quasar samples. eBOSS adopt two approaches target quasars over 7500 deg2. First, a "CORE" sample combine optical selection in ugriz using likelihood-based routine called XDQSOz, with mid-IR-optical color cut. CORE (to g < 22 or r 22) should return ∼70 deg−2 at redshifts 0.9 z 2.2 and ∼7 deg−2z > 2.1...
ABSTRACT We describe the algorithm used to select luminous red galaxy (LRG) sample for extended Baryon Oscillation Spectroscopic Survey (eBOSS) of Sloan Digital Sky IV (SDSS-IV) using photometric data from both SDSS and Wide-field Infrared Explorer . LRG targets are required meet a set color selection criteria have z -band i MODEL magnitudes < 19.95 19.9 21.8, respectively. Our selects roughly 50 per square degree, great majority which lie in redshift range 0.6 1.0 (median 0.71)....
Inflation may provide unique insight into the physics at highest available energy scales that cannot be replicated in any realistic terrestrial experiment. Features primordial power spectrum are generically predicted a wide class of models inflation and its alternatives, observationally one most overlooked channels for finding evidence non-minimal inflationary models. Constraints from observations cosmic microwave background cover widest range feature frequencies, but sensitive constraints...
Abstract We present the first scientific results from luminous red galaxy (LRG) sample of extended Baryon Oscillation Spectroscopic Survey (eBOSS) combined with high-redshift galaxies previous BOSS sample. measure small- and intermediate-scale clustering a more than 97,000 in redshift range <?CDATA $0.6\lt z\lt 0.9$?> . interpret these measurements framework Halo Occupation Distribution. The bias this LRGs is 2.30 ± 0.03, satellite fraction 13% 3% mean halo mass $2.5\times...
We analyze the anisotropic clustering of Sloan Digital Sky Survey-IV Extended Baryon Oscillation Spectroscopic Survey (eBOSS) Luminous Red Galaxy Data Release 14 (DR14) sample combined with (BOSS) CMASS galaxies in redshift range 0.6$
Abstract We present results from a search for radio transient associated with the LIGO/Virgo source S190814bv, likely neutron star–black hole (NSBH) merger, Australian Square Kilometre Array Pathfinder. imaged 30 deg 2 field at Δ T = 2, 9, and 33 days post-merger frequency of 944 MHz, comparing them to reference images Rapid ASKAP Continuum Survey observed 110 prior event. Each epoch our observations covers 89% localization region. conducted an untargeted transients in this field, resulting...
ABSTRACT We describe the redmonster automated redshift measurement and spectral classification software designed for extended Baryon Oscillation Spectroscopic Survey (eBOSS) of Sloan Digital Sky IV (SDSS-IV). algorithms, template standard requirements, newly developed galaxy templates to be used on eBOSS spectra. present results from testing early data eBOSS, where we have found a 90.5% success rate luminous red sample (redshifts 0.6 ≲ z 1.0). The performance meets cosmology requirements...
Abstract Machine-learning (ML) algorithms will play a crucial role in studying the large data sets delivered by new facilities over next decade and beyond. Here, we investigate capabilities limits of such methods finding galaxies with brightness-variable active galactic nuclei (AGNs). Specifically, focus on an unsupervised method based self-organizing maps (SOM) that apply to set nonparametric variability estimators. This technique allows us maintain domain knowledge systematics control...
We describe a new method of combining optical and infrared photometry to select luminous red galaxies (LRGs) at redshifts . explore this technique using combination from CFHTLS Hubble Space Telescope, the Wide-Field Infrared Survey Explorer satellite, spectroscopic or photometric DEEP2 Galaxy Redshift COSMOS. present variety methods for testing success our selection optimization given set rest-frame color redshift requirements. have tested in two different regions sky, COSMOS Extended Groth...
The Euclid, Rubin/LSST and Roman (WFIRST) projects will undertake flagship optical/near-infrared surveys in the next decade. By mapping thousands of square degrees sky covering electromagnetic spectrum between 0.3 2 microns with sub-arcsec resolution, these detect several tens billions sources, enable a wide range astrophysical investigations by astronomical community provide unprecedented constraints on nature dark energy matter. ultimate cosmological, time-domain science yield from...
The present work deals with optimization of welding process variables by using Metal inert gas welding. In this input are voltage (V), current (A) and speed(S) tensile properties, hardness, penetration as responses low carbon steel (ASTM A29). design experiments based on Taguchi orthogonal array [L9], acquires Analysis variance (ANOVA) to determine the influence parameters optimal condition.
Joint survey processing (JSP) is the pixel level combination of LSST, Euclid, and WFIRST datasets. By combining high spatial resolution space-based datasets with deep, seeing-limited, ground-based images in optical bands, systematics like source confusion astrometric mismatch can be addressed to derive highest precision optical/infrared photometric catalogs. This white paper highlights scientific motivation, computational algorithmic needs build joint capabilities, which individual projects...
Abstract Progressing cavity (PC) pumps deployed as an artificial lift method have seen their range of use expand from heavy oil origins in Canada to a wide variety different applications around the world. This expansion has been enabled by development new products meet volume, and downhole fluid environment requirements. However effect on PC pumps‘ stator elastomeric lining dimensions properties and, turn impact pump performance life, introduces critical application design consideration....
This article describes the roughness measurement of deformed surfaces using digital techniques, enabling a comprehensive assessment parameters in terms density and slope distribution, Abbott curve, power spectrum, autocorrelation functions, etc. Short long wavelengths, introduced on surface by plastic deformation process, influence its parameters. These wavelengths are not measured commercial measuring methods due to their being rejected as waviness. A new method for determining ‘n’ value...
The ubiquitous variability of quasars across a wide range wavelengths and timescales encodes critical information about the structure dynamics circumnuclear emitting regions that are too small to be directly resolved, as well detailed underlying physics accretion feedback processes in these active supermassive black holes. We emphasize importance studying quasar with time-domain spectroscopy, focusing on two science cases: (1) reverberation mapping (RM) measure broad-line region sizes hole...
We report the discovery of a mid-infrared variable AGN which is hosted by an ultraluminous infrared galaxy (ULIRG) candidate in Sloan Stripe 82 field. \textit{WISE} \textit{J030654.88+010833.6} red, extended galaxy, we estimate to be at photometric redshift 0.28 $\leq$ z 0.31, based on its optical and near-infrared spectral energy distribution (SED). The factor two variability over 8 years seen 3.4 4.6 $\mu$m wavelength channels not clearly correlated with archival data. Based our estimation...