A5003444100- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- CCD and CMOS Imaging Sensors
- History and Developments in Astronomy
- Remote Sensing in Agriculture
- Pulsars and Gravitational Waves Research
- Statistical and numerical algorithms
- Astrophysics and Star Formation Studies
- Neutrino Physics Research
- Geophysics and Gravity Measurements
- Gaussian Processes and Bayesian Inference
- Blind Source Separation Techniques
- Impact of Light on Environment and Health
- Computational Physics and Python Applications
- Relativity and Gravitational Theory
University College London
2016-2025
Kavli Institute for Particle Astrophysics and Cosmology
2024
Stanford University
2024
University College Lahore
2004-2023
Polish Academy of Sciences
2022
Center for Theoretical Physics
2022
Campbell Collaboration
2005-2021
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2021
Oak Ridge National Laboratory
2021
University of Southampton
2021
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,062 new measurements 721 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. All search limits are listed in Summary Tables. also give numerous tables, figures, formulae, reviews...
Abstract The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,143 new measurements 709 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle search limits are listed in Summary Tables. give numerous tables, figures, formulae,...
The 2dF Galaxy Redshift Survey (2dFGRS) is designed to measure redshifts for approximately 250-000 galaxies. This paper describes the survey design, spectroscopic observations, redshift measurements and data base. 2dFGRS uses multifibre spectrograph on Anglo-Australian Telescope, which capable of observing 400 objects simultaneously over a 2° diameter field. source catalogue revised extended version APM galaxy catalogue, targets are galaxies with extinction-corrected magnitudes brighter than...
We present a power-spectrum analysis of the final 2dF Galaxy Redshift Survey (2dFGRS), employing direct Fourier method. The sample used comprises 221 414 galaxies with measured redshifts. investigate in detail modelling selection, improving on previous treatments number respects. A new angular mask is derived, based revisions to photometric calibration. redshift selection function determined by dividing survey according rest-frame colour, and deducing self-consistent treatment k-corrections...
We report the final redshift release of 6dF Galaxy Survey, a combined and peculiar velocity survey over southern sky (|b|>10 deg). Its 136,304 spectra have yielded 110,256 new extragalactic redshifts catalogue 125,071 galaxies making near-complete samples with (K, H, J, r_F, b_J) <= (12.65, 12.95, 13.75, 15.60, 16.75). The median is 0.053. Survey data, including images, spectra, photometry redshifts, are available through an online database. describe changes to information in database since...
We combine the Two Micron All Sky Survey (2MASS) Extended Source Catalogue and 2dF Galaxy Redshift to produce an infrared selected galaxy catalogue with 17 173 measured redshifts. use this extensive data set estimate luminosity functions in J- KS-bands. The are fairly well fitted by Schechter parameters MJ*−5 log h = −22.36±0.02, αJ −0.93±0.04, ΦJ* 0.0104±0.0016 h3 Mpc−3 J-band MKS*−5 −23.44±0.03, αKS −0.96±0.05, ΦKS* 0.0108±0.0016 KS-band (2MASS Kron magnitudes). These derived assuming a...
We present the first cosmology results from large-scale structure in Dark Energy Survey (DES) spanning 5000 deg$^2$. perform an analysis combining three two-point correlation functions (3$\times$2pt): (i) cosmic shear using 100 million source galaxies, (ii) galaxy clustering, and (iii) cross-correlation of with lens positions. The was designed to mitigate confirmation or observer bias; we describe specific changes made sample following unblinding results. model data within flat $\Lambda$CDM...
This overview paper describes the legacy prospect and discovery potential of Dark Energy Survey (DES) beyond cosmological studies, illustrating it with examples from DES early data.DES is using a wide-field camera (DECam) on 4 m Blanco Telescope in Chile to image 5000 sq deg sky five filters (grizY).
The Cluster Lensing And Supernova survey with Hubble (CLASH) is a 524-orbit multi-cycle treasury program to use the gravitational lensing properties of 25 galaxy clusters accurately constrain their mass distributions. survey, described in detail this paper, will definitively establish degree concentration dark matter cluster cores, key prediction CDM. CLASH sample larger and less biased than current samples space-based imaging studies similar depth, as we have minimized lensing-based...
We present the results of 2MASS Redshift Survey (2MRS), a ten-year project to map full three-dimensional distribution galaxies in nearby universe. The Two Micron All Sky (2MASS) was completed 2003 and its final data products, including an extended source catalog (XSC), are available online. XSC contains nearly million with Ks ⩽ 13.5 mag is essentially complete mostly unaffected by interstellar extinction stellar confusion down galactic latitude |b| = 5° for bright galaxies. Near-infrared...
The possibility of measuring the density parameter Ω0 and cosmological constant |$\lambda_0 \equiv\Lambda/(3H^{2}_{0})$| using dynamical tests is explored in linear non-linear theory. In theory we find that rate growth perturbations at present epoch approximated by |$f(z = 0) \approx \Omega^{0.6}_{0}+ \frac1{70} \lambda_0(1+ \frac1{2} \Omega_0)$|. Therefore, such as infall around clusters dipoles do not distinguish well between universes with without a constant. At higher redshifts, also...
We use 26×106 galaxies from the Dark Energy Survey (DES) Year 1 shape catalogs over 1321 deg2 of sky to produce most significant measurement cosmic shear in a galaxy survey date. constrain cosmological parameters both flat ΛCDM and wCDM models, while also varying neutrino mass density. These results are shown be robust using two independent catalogs, photo-z calibration methods, analysis pipelines blind analysis. find 3.5% fractional uncertainty on σ8(Ωm/0.3)0.5=0.782+0.027−0.027 at 68%...
The Dark Energy Camera is a new imager with 22 diameter field of view mounted at the prime focus Victor M. Blanco 4 m telescope on Cerro Tololo near La Serena, Chile. camera was designed and constructed by Survey Collaboration meets or exceeds stringent requirements for wide-field supernova surveys which collaboration uses it. consists five-element optical corrector, seven filters, shutter 60 cm aperture, charge-coupled device (CCD) focal plane 250 μm thick fully depleted CCDs cooled inside...
We report the discovery of eight new ultra-faint dwarf galaxy candidates in second year optical imaging data from Dark Energy Survey (DES). Six these are detected at high confidence, while two lower-confidence identified regions non-uniform survey coverage. The stellar systems found by three independent automated search techniques and as overdensities stars, consistent with isochrone luminosity function an old metal-poor simple population. faint (Mv > -4.7 mag) span a range physical sizes...
We investigate the dependence of galaxy clustering on luminosity and spectral type using 2dF Galaxy Redshift Survey (2dFGRS). Spectral types are assigned principal-component analysis Madgwick et al. divide sample into two broad classes: galaxies with strong emission lines ('late types') more quiescent ('early types'). measure in real space, free from any distortion pattern owing to peculiar velocities, for a series volume-limited samples. The projected correlation functions both well...
The Dark Energy Spectroscopic Instrument (DESI) is a massively multiplexed fiber-fed spectrograph that will make the next major advance in dark energy timeframe 2018-2022. On Mayall telescope, DESI obtain spectra and redshifts for at least 18 million emission-line galaxies, 4 luminous red galaxies 3 quasi-stellar objects, order to: probe effects of on expansion history using baryon acoustic oscillations (BAO), measure gravitational growth through redshift-space distortions, sum neutrino...
We investigate the dependence of strength galaxy clustering on intrinsic luminosity using Anglo-Australian two degree field redshift survey (2dFGRS). The 2dFGRS is over an order magnitude larger than previous surveys used to address this issue. measure projected two-point correlation function galaxies in a series volume-limited samples. free from any distortion pattern induced by peculiar motions and well described power law pair separation range . real space well-fitted length power-law...
We use more than 110500 galaxies from the 2dF galaxy redshift survey (2dFGRS) to estimate b_J-band luminosity function at z=0, taking account of evolution, distribution magnitude measurement errors and small corrections for incompletenessin catalogue. Throughout interval -16.5>M- 5log h>-22, is accurately described by a Schechter with M* -5log h =-19.66+/-0.07, alpha=-1.21+/-0.03 phistar=(1.61+/-0.08) 10^{-2} h^3/Mpc^3, giving an integrated density rho_L=(1.82+/-0.17) 10^8 L_sol/Mpc^3...
We report the discovery of eight new Milky Way companions in optical imaging data collected during first year Dark Energy Survey (DES). Each system is identified as a statistically significant over-density individual stars consistent with expected isochrone and luminosity function an old metal-poor stellar population. The objects span wide range absolute magnitudes (MV from to ), physical sizes (), heliocentric distances (). Based on low surface brightnesses, large sizes, and/or...
ABSTRACT We search for excess γ -ray emission coincident with the positions of confirmed and candidate Milky Way satellite galaxies using six years data from Fermi Large Area Telescope (LAT). Our sample 45 stellar systems includes 28 kinematically dark-matter-dominated dwarf spheroidal (dSphs) 17 recently discovered that have photometric characteristics consistent population known dSphs. For each these targets, relative predicted flux due to dark matter annihilation is taken kinematic...
ABSTRACT We describe updates to the redMaPPer algorithm, a photometric red-sequence cluster finder specifically designed for large surveys. The updated algorithm is applied of Science Verification (SV) data from Dark Energy Survey (DES), and Sloan Digital Sky (SDSS) DR8 set. DES SV catalog locally volume limited contains 786 clusters with richness (roughly equivalent ) . consists 26,311 , sharply increasing threshold as function redshift performance both catalogs shown be excellent,...
Growing observational evidence now indicates that nebular line emission has a significant impact on the rest-frame optical fluxes of z~5-7 galaxies observed with Spitzer. This makes appear more massive, lower specific star formation rates. However, corrections for this have been very difficult to perform reliably due huge uncertainties overall strength such at z>~5.5. Here, we present most direct yet ubiquitous high-EW [OIII]+Hbeta in Lyman-break z~7, while also presenting strategy an...