J. J. Mohr
A5070235300- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Dark Matter and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- CCD and CMOS Imaging Sensors
- Astrophysics and Star Formation Studies
- History and Developments in Astronomy
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Photonic and Optical Devices
- Pulsars and Gravitational Waves Research
- Advanced MEMS and NEMS Technologies
- Semiconductor Lasers and Optical Devices
- Superconducting and THz Device Technology
- Solar and Space Plasma Dynamics
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
Ludwig-Maximilians-Universität München
2016-2025
Max Planck Institute for Extraterrestrial Physics
2016-2025
Institut für Urheber- und Medienrecht
2024-2025
European Space Astronomy Centre
2024
University College London
2024
Lancaster University
2024
Centre National de la Recherche Scientifique
2024
Aix-Marseille Université
2024
Austin Peay State University
2024
University of Zurich
2024
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).
We present 1210 Johnson/Cousins B, V, R, and I photometric observations of 22 recent Type Ia supernovae (SNe Ia): SNe 1993ac, 1993ae, 1994M, 1994S, 1994T, 1994Q, 1994ae, 1995D, 1995E, 1995al, 1995ac, 1995ak, 1995bd, 1996C, 1996X, 1996Z, 1996ab, 1996ai, 1996bk, 1996bl, 1996bo, 1996bv. Most the photometry was obtained at Fred Lawrence Whipple Observatory Harvard-Smithsonian Center for Astrophysics in a cooperative observing plan aimed improving database Ia. The redshifts sample range from cz =...
eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is the primary instrument on Spectrum-Roentgen-Gamma (SRG) mission, which was successfully launched July 13, 2019, from Baikonour cosmodrome. After commissioning of and a subsequent calibration performance verification phase, started survey entire sky December 2019. By end 2023, eight complete scans celestial sphere will have been performed, each lasting six months. At this program, all-sky in soft X-ray band (0.2--2.3\,keV)...
The South Pole Telescope (SPT) is a 10 m diameter, wide-field, offset Gregorian telescope with 966 pixel, multicolor, millimeter-wave, bolometer camera. It located at the Amundsen-Scott station in Antarctica. design of SPT emphasizes careful control spillover and scattering, to minimize noise false signals due ground pickup. key initial project large-area survey wavelengths 3, 2, 1.3 mm, detect clusters galaxies via Sunyaev-Zel'dovich effect measure small-scale angular power spectrum cosmic...
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 present a systematic analysis of the intracluster medium (ICM) in an X-ray flux limited sample 45 galaxy clusters. Using archival ROSAT Position-Sensitive Proportional Counter (PSPC) data and published ICM temperatures, we best-fit double single β model profiles, extract central densities radial distributions. use ensemble numerical cluster simulations to quantify sources uncertainty for all reported parameters. examine properties within context models structure formation feedback from...
We present a measurement of the angular power spectrum cosmic microwave background (CMB) using data from South Pole Telescope (SPT). The consist 790 deg2 sky observed at 150 GHz during 2008 and 2009. Here we over multipole range 650 < ℓ 3000, where it is dominated by primary CMB anisotropy. combine this with spectra seven-year Wilkinson Microwave Anisotropy Probe (WMAP) release to constrain cosmological models. find that SPT WMAP are consistent each other and, when combined, well fit...
eROSITA is the primary instrument on Russian SRG mission. In first four years of scientific operation after its launch, foreseen for 2014, it will perform a deep survey entire X-ray sky. soft band (0.5-2 keV), this be about 20 times more sensitive than ROSAT all sky survey, while in hard (2-10 keV) provide ever true imaging at those energies. Such all-sky revolutionize our view high-energy sky, and calls major efforts synergic, multi-wavelength wide area surveys order to fully exploit...
We investigate the near-infrared K-band properties of brightest cluster galaxies (BCGs) in a sample 93 galaxy clusters and groups, using data from Two Micron All Sky Survey. Our spans factor 70 mass, making it sensitive to mass related trends. study correlations between BCG luminosity L_b or host clusters, finding that BCGs more massive are luminous than their counterparts less systems, become important overall light L200 as increases. argue grow mainly by merging with other hierarchically;...
We study the expected redshift evolution of galaxy cluster abundance between 0 ≲ z 3 in different cosmologies, including effects cosmic equation state parameter w ≡ p/ρ. Using halo mass function obtained recent large-scale numerical simulations, we model yields a 12 deg2 Sunyaev-Zeldovich effect (SZE) survey and deep 104 X-ray over wide range cosmological parameters. quantify statistical differences among cosmologies using both total number distribution clusters. Provided that local is known...
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...
We present a measurement of the cosmic microwave background (CMB) temperature power spectrum using data from recently completed South Pole Telescope Sunyaev–Zel'dovich (SPT-SZ) survey. This is made observations 2540 deg2 sky with arcminute resolution at 150 GHz, and improves upon previous measurements SPT by tripling area. report CMB anisotropy over multipole range 650 < ℓ 3000. fit bandpowers, combined 7 yr Wilkinson Microwave Anisotropy Probe (WMAP7) data, six-parameter ΛCDM cosmological...
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,...
We report the results of an 87 square-degree point-source survey centered at R.A. 5h30m, decl. -55 deg. taken with South Pole Telescope (SPT) 1.4 and 2.0 mm wavelengths arc-minute resolution milli-Jansky depth. Based on ratio flux in two bands, we separate detected sources into populations, one consistent synchrotron emission from active galactic nuclei (AGN) thermal dust. present source counts for each population 11 to 640 mJy 4.4 800 mm. The are dominated by synchrotron-dominated across...
We present a detection-significance-limited catalog of 21 Sunyaev-Zel'dovich selected galaxy clusters. These clusters, along with 1 unconfirmed candidate, were identified in 178 deg^2 sky surveyed 2008 by the South Pole Telescope to depth 18 uK-arcmin at 150 GHz. Optical imaging from Blanco Cosmology Survey (BCS) and Magellan telescopes provided photometric (and some cases spectroscopic) redshift estimates, redshifts ranging z=0.15 z>1, median z = 0.74. Of confirmed three previously as...
We use South Pole Telescope data from 2008 and 2009 to detect the non-Gaussian signature in cosmic microwave background (CMB) produced by gravitational lensing measure power spectrum of projected potential. constrain ratio measured amplitude signal that expected a fiducial ΛCDM cosmological model be 0.86 ± 0.16, with no disfavored at 6.3σ. Marginalizing over models allowed Wilkinson Microwave Anisotropy Probe (WMAP7) results measurement Alens = 0.90 0.19, indicating matter fluctuations...
We combine Dark Energy Survey Year 1 clustering and weak lensing data with Baryon Acoustic Oscillations (BAO) Big Bang Nucleosynthesis (BBN) experiments to constrain the Hubble constant. Assuming a flat $\Lambda$CDM model minimal neutrino mass ($\sum m_\nu = 0.06$ eV) we find $H_0=67.2^{+1.2}_{-1.0}$ km/s/Mpc (68% CL). This result is completely independent of constant measurements based on distance ladder, Cosmic Microwave Background (CMB) anisotropies (both temperature polarization), strong...
(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...
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...
ABSTRACT We present the first three-frequency South Pole Telescope (SPT) cosmic microwave background (CMB) power spectra. The band powers presented here cover angular scales 2000 < ℓ 9400 in frequency bands centered at 95, 150, and 220 GHz. At these frequencies scales, a combination of primary CMB anisotropy, thermal kinetic Sunyaev–Zel'dovich (SZ) effects, radio galaxies, infrared (CIB) contributes to signal. combine Planck /HFI SPT data GHz constrain amplitude shape CIB spectrum find...
We explore extensions to the $\Lambda$CDM cosmology using measurements of cosmic microwave background (CMB) from recent SPT-SZ survey, along with data WMAP7 and $H_0$ BAO. check for consistency within between these datasets, find some tension. The CMB alone gives weak support physics beyond $\Lambda$CDM, due a slight trend relative decreasing power towards smaller angular scales. While it may be statistical fluctuation, this could also explained by several extensions. consider running index...
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 use a set of hydrodynamical and dark matter-only (DMonly) simulations to calibrate the halo mass function (HMF). explore impact baryons, propose an improved parametrization for spherical overdensity masses, identify differences between our DMonly HMF previously published HMFs. Magneticum simulations, which are well suited because their accurate treatment high resolution, large cosmological volumes up (3818 Mpc)3. Baryonic effects globally decrease masses galaxy clusters, which, at given...
Due to their proximity, high dark-matter content, and apparent absence of non-thermal processes, Milky Way dwarf spheroidal satellite galaxies (dSphs) are excellent targets for the indirect detection dark matter. Recently, eight new dSph candidates were discovered using first year data from Dark Energy Survey (DES). We searched gamma-ray emission coincident with positions these objects in six years Fermi Large Area Telescope data. found no significant excesses emission. Under assumption that...
We constrain the mass–richness scaling relation of redMaPPer galaxy clusters identified in Dark Energy Survey Year 1 data using weak gravitational lensing. split into 4 × 3 bins richness λ and redshift |$z$| for ≥ 20 0.2 ≤ 0.65 measure mean masses these their stacked lensing signal. By modelling as 〈M200m|λ, |$z$|〉 = M0(λ/40)F((1 + |$z$|)/1.35)G, we normalization at 5.0 per cent level, finding M0 [3.081 ± 0.075(stat) 0.133(sys)] · 1014 M⊙ 40 0.35. The recovered index is F 1.356 0.051 (stat)...