A5089828153- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- History and Developments in Astronomy
- Ovarian cancer diagnosis and treatment
- Astrophysics and Star Formation Studies
- Endometrial and Cervical Cancer Treatments
- Dark Matter and Cosmic Phenomena
- Trauma, Hemostasis, Coagulopathy, Resuscitation
- Prostate Cancer Treatment and Research
- Distributed and Parallel Computing Systems
- Thyroid Cancer Diagnosis and Treatment
- Effects of Radiation Exposure
- Eicosanoids and Hypertension Pharmacology
- Abdominal Trauma and Injuries
- Impact of Light on Environment and Health
- Neuroscience and Neuropharmacology Research
- Laser-Matter Interactions and Applications
Heidelberg University
2013-2024
Georgia Institute of Technology
2020
Hunter Holmes McGuire VA Medical Center
2016-2019
Lawrence Livermore National Laboratory
2018
Max Planck Institute for Radio Astronomy
2012-2014
Lake Erie College of Osteopathic Medicine
2014
Aix-Marseille Université
2013
Centre National de la Recherche Scientifique
2013
Laboratoire d’Astrophysique de Marseille
2013
Martin Luther University Halle-Wittenberg
2008
We present constraints on the mean dark energy density, Omega_X and equation of state parameter, w_X, based Chandra measurements X-ray gas mass fraction in 26 luminous, dynamically relaxed galaxy clusters spanning redshift range 0.07-1, same data require w_X
We present constraints on the mean matter density, Ω m , dark energy DE and equation of state parameter, w, using Chandra measurements X-ray gas mass fraction (f ) in 42 hot (kT > 5keV), luminous, dynamically relaxed galaxy clusters spanning redshift range 0.05 < z 1.1.Using only f data for six lowest at 0.15, which has a negligible effect measurements, we measure = 0.28 ± 0.06 (68 per cent confidence limits, standard priors Hubble Constant, H 0 baryon b h 2 ).Analyzing all clusters,...
We employ robust weak gravitational lensing measurements to improve cosmological constraints from of the galaxy cluster mass function and its evolution, using X-ray selected clusters detected in ROSAT All-Sky Survey. Our analysis constrains absolute scale such at 8 per cent level, including both statistical systematic uncertainties. Combining it with survey data follow-up observations, we find a tight constraint on combination mean matter density late-time normalization power spectrum,...
This is the second in a series of papers studying astrophysics and cosmology massive, dynamically relaxed galaxy clusters. The data set employed here consists Chandra observations 40 such clusters, identified comprehensive search archive for hot (kT ≳ 5舁keV), morphologically systems, as well high-quality weak gravitational lensing subset these Here we present cosmological constraints from measurements gas mass fraction,舁 fgas, this cluster sample. By incorporating robust calibration X-ray...
We present precise measurements of the X-ray gas mass fraction for a sample luminous, relatively relaxed clusters galaxies observed with Chandra observatory, which independent confirmation results is available from gravitational lensing studies. Parametrizing total (luminous plus dark matter) profiles using model Navarro, Frenk & White, we show that fractions in asymptote towards an approximately constant value at radius r2500, where mean interior density 2500 times critical Universe...
We use the Chandra X-ray Observatory to study dark matter haloes of 34 massive, dynamically relaxed galaxy clusters, spanning redshift range 0.06 < z 0.7. The observed and total mass (dark-plus-luminous matter) profiles can be approximated by Navarro–Frenk–White (hereafter NFW) model for cold (CDM) haloes; ∼80 per cent NFW provides a statistically acceptable fit. In contrast, singular isothermal sphere can, in almost every case, completely ruled out. observe well-defined mass–concentration...
This is the first in a series of papers studying astrophysics and cosmology massive, dynamically relaxed galaxy clusters. Here we present new, automated method for identifying clusters based on their morphologies X-ray imaging data. While broadly similar to others literature, morphological quantities that measure are specifically designed provide fair basis comparison across range data quality cluster redshifts, be robust against missing due point-source masks gaps between detectors, avoid...
This is the fourth in a series of papers studying astrophysics and cosmology massive, dynamically relaxed galaxy clusters. Here, we use measurements weak gravitational lensing from Weighing Giants project to calibrate Chandra X-ray total mass that rely on assumption hydrostatic equilibrium. comparison masses provides measurement combined bias due both astrophysical instrumental sources. Assuming fixed cosmology, within characteristic radius (r_2500) determined data, measure ratio 0.96 +/- 9%...
We present updated cosmological constraints from measurements of the gas mass fractions ($f_{gas}$) massive, dynamically relaxed galaxy clusters. Our new data set has greater leverage on models dark energy, thanks to addition Perseus Cluster at low redshifts, two clusters redshifts $z>0.97$, and significantly longer observations four $0.6<z<0.9$. low-redshift ($z<0.16$) $f_{gas}$ data, combined with cosmic baryon fraction measured microwave background (CMB), imply a Hubble constant $h =...
We aim to use microlensing taking place in the lensed quasar Q2237+0305 study structure of broad line region and measure size emitting CIV CIII] lines. Methods: Based on 39 spectrophotometric monitoring data points obtained between Oct. 2004 Dec. 2007, we derived lightcurves for emission used three different techniques analyse signal. Different components lines (narrow, very broad) are identified studied. built a library simulated that reproduce signal observed continuum provided only source...
The eROSITA X-ray telescope on board the Spectrum-Roentgen-Gamma (SRG) mission will measure position and properties of about 100,000 clusters galaxies 3 million active galactic nuclei over full sky. To study statistical this ongoing survey, it is key to estimate selection function accurately. We create a set sky light-cones using MultiDark UNIT dark matter only N-body simulations. present novel method predict emission galaxy clusters. Given halo (mass, redshift, ellipticity, offset...
Chandra and XMM-Newton observations have confirmed the presence of large temperature gradients within cores many relaxed clusters galaxies. Here we investigate whether thermal conduction operating over those can supply sufficient heat to offset radiative cooling. Narayan & Medredev Gruzinov noted, using published results on cluster temperatures, that a factor few Spitzer rate is balance bremsstrahlung From detailed study emission measure profiles Abell 2199 1835, find flux required by...
We present the analysis of 30-ks Chandra observations galaxy cluster Abell 1835. Overall, X-ray image shows a relaxed morphology, although we detect substructure in inner 30-kpc radius. Spectral steep drop gas temperature from ∼12-keV outer regions to ∼4-keV core. The data provide tight constraints on gravitational potential which can be parametrized by Navarro, Frenk & White model. allow us measure mass fraction as function radius, leading determination cosmic matter density . projected...
A review of 125 patients with stage I adenocarcinoma the cervix is reported. The subtypes included endocervical (60), adenosquamous (38), papillary (15), clear cell (nine), and mucoid (three). cumulative 5-year survival was 60%, significantly related to following: tumor differentiation—well-differentiated 80%, moderately differentiated 69%, poorly 41%; lymph node status—nodes positive 28%, nodes negative 82%; amount residual disease present in after radical hysterectomy; interval from...
The hepatic artery was embolized with Gelfoam in 12 dogs to evaluate the effect of embolization on function. Liver function studies, including SGPT, alkaline phosphatase, BSP test, and bilirubin, were done serially over a 6 week period following embolization. Eleven survived experimental period. Hepatic caused some liver damage; however, recovery occurred by weeks. These results suggest possible therapeutic role for patients massive bleeding or hemobilia who are not surgical candidates would...
THE possibility that the mechanical action of neck muscles can, in rare cases, sever a projecting portion thyroid gland has been recognized for over fifty years.1 This process is most likely to occur nodular colloid goiter. Cases nodules separate from were excluded several series describing malignant so-called lateral aberrant tumor,2 3 4 5 6 but no detailed description former entity was found.The present report describes patients who found at operation have histologically benign tissue...
ABSTRACT The relationship linking a galaxy cluster’s total mass with the concentration of its profile and redshift is fundamental prediction Cold Dark Matter (CDM) paradigm cosmic structure formation. However, confronting those predictions observations complicated by fact that simulated clusters are not representative observed samples where detailed constraints possible. In this work, we calculate symmetry-peakiness-alignment (SPA) morphology metrics for maps X-ray emissivity from three...
In the gravitational lens system Q2237+0305 cruciform quasar image geometry is twisted by 10° effect of a bar in lensing galaxy. This can be used to measure mass bar. We construct new model for this with power-law elliptical bulge and Ferrers The observed ellipticity optical isophotes galaxy leads nearly isothermal profile bulge, total magnification 16+5−4. (7.5 ± 1.5) × 108h−175 M⊙ region inside images.
The F-GAMMA program is a coordinated effort to investigate the physics of Active Galactic Nuclei (AGNs) via multi-frequency monitoring Fermi blazars. In current study we show and discuss evolution broad-band radio spectra, which are measured at ten frequencies between 2.64 142 GHz using Effelsberg 100-m IRAM 30-m telescopes. It shown that any 78 sources studied can be classified in terms their variability characteristics merely 5 types variability. argued these attributed only two classes...
We show how to significantly improve difference image analysis (DIA) of gravitationally lensed quasars over long periods time using Gaia proper motions. DIA requires the subtraction a reference from individual images monitoring campaign, stars in field align images. Since motion can be same order as pixel size during several-year we use DR3 motions enable correct alignment. The corrected star positions aligned by ISIS package. is carried out HOTPAnTS apply point spread function (PSF)...
Hemorrhage from artificially produced renal lacerations was controlled by selective arterial embolization with either plain or Amicar-mixed autogenous blood clot in ten dogs. The laceration sites healed as scars. Despite the presence of scattered, small infarcts caused embolization, hypertension did not develop any dog during two-month follow-up. No long-term differences could be detected between kidneys embolized modified clot. Although it is recognized that dogs have a more active...