A5012425139- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Scientific Research and Discoveries
- History and Developments in Astronomy
- Advanced Fiber Laser Technologies
- Radio Astronomy Observations and Technology
- Impact of Light on Environment and Health
- Particle Detector Development and Performance
- Planetary Science and Exploration
- Semiconductor Lasers and Optical Devices
- Particle Accelerators and Free-Electron Lasers
- Spectroscopy and Laser Applications
- CCD and CMOS Imaging Sensors
- Calibration and Measurement Techniques
- Solar and Space Plasma Dynamics
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
Ludwig-Maximilians-Universität München
2014-2023
Max Planck Institute for Extraterrestrial Physics
2014-2023
Stuttgart Observatory
2011-2023
Universidade Federal de Uberlândia
2023
Bayerische Staatssammlung für Paläontologie und Geologie
2012-2018
Optica
2006-2014
Max Planck Society
2006-2014
Federal Foreign Office
2000-2011
The University of Texas at Austin
2010
Max Planck Institute for Astrophysics
2000-2005
Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3π$ Steradian Survey and Medium Deep in 5 bands ($grizy_{P1}$). The mean 5$σ$ point source limiting sensitivities stacked 3$π$ $grizy_{P1}$ are (23.3, 23.2, 23.1, 22.3, 21.4) respectively. upper bound on systematic uncertainty photometric calibration across is 7-12 millimag depending bandpass. astrometric using Gaia frame comes from comparison results with Gaia: standard deviation median residuals ($...
We present measurements of the Hubble diagram for 103 Type Ia supernovae (SNe) with redshifts 0.04 < z 0.42, discovered during first season (Fall 2005) Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. These data fill in redshift "desert" between low- and high-redshift SN surveys. combine SDSS-II new distance estimates published from ESSENCE survey, Legacy Survey, Space Telescope, a compilation nearby measurements. Combining Baryon Acoustic Oscillations SDSS Luminous Red Galaxy sample...
The Sloan Digital Sky Survey-II (SDSS-II) has embarked on a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z 0.35) Type Ia supernovae (SNe Ia) using repeated five-band (ugriz) imaging over an area of 300 sq. deg. survey region is stripe 2.5° wide centered the celestial equator in Southern Galactic Cap that been imaged numerous times earlier years, enabling construction deep reference image discovery new objects. Supernova observations are being...
Abstract The Hobby–Eberly Telescope (HET) Dark Energy Experiment (HETDEX) is undertaking a blind wide-field low-resolution spectroscopic survey of 540 deg 2 sky to identify and derive redshifts for million Ly α -emitting galaxies in the redshift range 1.9 < z 3.5. ultimate goal measure expansion rate universe at this epoch, sharply constrain cosmological parameters thus nature dark energy. A major multiyear Wide-Field Upgrade (WFU) HET was completed 2016 that substantially increased field...
We present a measurement of the evolution stellar mass function (MF) galaxies and total density at 010^10 Msun which are likely progenitors todays L* found in much smaller numbers above z=2. However, we note that massive with M>10^11 even to largest redshift probe. Beyond z=2 becomes more rapid. find z=1 is 50% local value. At z=2, 25% assembled, z=3 z=5 least 15% 5% stars place, respectively. The number evolves very similarly lower masses. It decreases by 0.4 dex z=1, 0.6 1 z=4.
The optical rest-frame sizes of 10 the most massive (~5x10^{11}h_{70}^{-2}M_sun) galaxies found in near-infrared MUNICS survey at 1.2<z<1.7 are analysed. Sizes were estimated both J and K' filters. These least a factor 4_{-1.0}^{+1.9} (+-1 sigma) smaller V-band than local counterparts same stellar mass. Consequently, mass density these objects is (at least) 60 times larger ellipticals today. Although populations passively fading, their structural properties rapidly changing since that...
We present a measurement of the evolution stellar mass function in four redshift bins at 0.4 < z 1.2, using sample more than 5000 K-selected galaxies drawn from MUNICS (Munich Near-Infrared Cluster Survey) data set. Our cover range 1010 h-2 M☉ ≤ M 1012 M☉. derive K-band mass-to-light ratios by fitting grid composite population models varying star formation history, age, and dust extinction to BVRIJK photometry. discuss average ratio as galaxy K B bands. compare our > 0 estimates obtained...
We study the escape of Ly-alpha photons from emitting galaxies (LAEs) and overall galaxy population using a sample 99 LAEs at 1.9<z<3.8 detected through integral-field spectroscopy blank fields by HETDEX Pilot Survey. For 89 showing counterparts in deep broad-band images we measure rest-frame UV luminosity slope, which use to estimate E(B-V) under assumption constant intrinsic slope for LAEs. These two quantities are used dust-corrected star formation rate (SFR). A comparison between...
We present a catalog of emission-line galaxies selected solely by their fluxes using wide-field integral field spectrograph. This work is partially motivated as pilot survey for the upcoming Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). describe observations, reductions, detections, redshift classifications, line fluxes, and counterpart information 397 detected over 169 sq.arcmin with 3500-5800 Ang. bandpass under 5 full-width-half-maximum (FWHM) spectral resolution. The survey's...
This paper describes the data release of Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey conducted between 2005 and 2007. Light curves, spectra, classifications, ancillary are presented for 10,258 variable transient sources discovered through repeat ugriz imaging SDSS Stripe 82, a 300 deg2 area along celestial equator. is comprised all brighter than r~22.5 mag with no history variability prior to 2004. Dedicated spectroscopic observations were performed on subset 889 transients, as...
We describe the survey design, calibration, commissioning, and emission-line detection algorithms for Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). The goal of HETDEX is to measure redshifts over a million Ly$\alpha$ emitting galaxies between 1.88<z<3.52, in 540 deg^2 area encompassing co-moving volume 10.9 Gpc^3. No pre-selection targets involved; instead measurements are accomplished via spectroscopic using suite wide-field integral field units distributed focal plane telescope....
Abstract We present the first publicly released catalog of sources obtained from Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). HETDEX is an integral field spectroscopic survey designed to measure Hubble expansion parameter and angular diameter distance at 1.88 < z 3.52 by using spatial distribution more than a million Ly α -emitting galaxies over total target area 540 deg 2 . The comes contiguous fiber spectra coverage 25 sky 2017 January through 2020 June, where object...
We review what has recently been learned from starburst-driven "superwinds," galaxy-scale outflows, dwarf galaxy surveys, and evidence for early-universe merging scenarios. apply this knowledge to simplified model populations of galaxies in the primeval era demonstrate how a substantial fraction intergalactic medium can be permeated with magnetic fields by outflow winds "volcanic early universe." Mechanisms both field regeneration diffusion are discussed as they at later epochs universe....
We use the very deep and homogeneous I-band selected dataset of FORS Deep Field (FDF) to trace evolution luminosity function over redshift range . show that FDF selection down misses order 10% galaxies would be detected in a K-band survey with magnitude limit (like FIRES). Photometric redshifts for 5558 are estimated based on photometry 9 filters (U, B, Gunn g, R, I, SDSS z, J, K special filter centered at 834 nm). A comparison 362 spectroscopic shows achieved accuracy photometric is only...
We present photometric and spectroscopic observations at optical near-infrared wavelengths of the nearby type Ic SN 2007gr. These represent most extensive data-set to date any supernova this sub-type, with frequent coverage from shortly after discovery more than one year post-explosion. deduce a rise time B-band maximum 11.5 \pm 2.7 days. find peak magnitude M_B=-16.8, light curves which are remarkably similar so-called 'hypernova' 2002ap. In contrast, spectra SNe 2007gr 2002ap show marked...
We explore the build-up of stellar mass in galaxies over a wide redshift range 0.4 < z 5.0 by studying evolution specific star formation rate (SSFR), defined as per unit mass, function and age. Our work is based on combined sample ~ 9000 from FORS Deep Field GOODS-S field, providing high statistical accuracy relative insensitivity against cosmic variance. As at lower redshifts, we find that lower-mass show higher SSFRs than galaxies, although highly obscured remain undetected our sample....
We present the morphological analysis based on HST-NIC2 (0.075 arcsec pixel−1) images in F160W filter of a sample nine massive field (>1011 M⊙) galaxies spectroscopically classified as early-types at 1.2 < z 1.7. Our shows that all them are bulge-dominated systems. In particular, six well fitted by de Vaucouleurs profile (n= 4) suggesting they can be considered pure elliptical galaxies. The remaining three better Sérsic with index 1.9 nfit 2.3 disc-like component could contribute up to 30...
We present a measurement of the volumetric Type Ia supernova (SN Ia) rate based on data from Sloan Digital Sky Survey II (SDSS-II) Supernova Survey. The adopted sample supernovae (SNe) includes 516 SNe at redshift z \lesssim 0.3, which 270 (52%) are spectroscopically identified as Ia. remaining 246 were through their light curves; 113 these objects have spectroscopic redshifts spectra host galaxy, and 133 photometric estimated SN curves. Based consideration 87 confirmed non-Ia discovered by...
ABSTRACT We present post-cryogenic Spitzer imaging at 3.6 and 4.5 μ m with the Infrared Array Camera (IRAC) of /HETDEX Exploratory Large-Area (SHELA) survey. SHELA covers ≈24 deg 2 Sloan Digital Sky Survey “Stripe 82” region, falls within footprints Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) Survey. The HETDEX blind R ∼ 800 spectroscopy will produce ∼200,000 redshifts from Ly α emission for galaxies in range 1.9 < z 3.5, an additional [O ii ] 0.5. When combined deep ugriz...
We use the Marcario Low Resolution Spectrograph at Hobby–Eberly Telescope to study kinematics of pseudobulges and classical bulges in nearby universe. present major axis rotational velocities, velocity dispersions, h3 h4 moments derived from high-resolution (σinst ≈ 39 km s−1) spectra for 45 S0 Sc galaxies; 27 galaxies we also minor data. combine our with bulge-to-disk decompositions. demonstrate first time that purely kinematic diagnostics bulge dichotomy agree systematically those based on...
Most Milky Way globular clusters (GCs) exhibit measurable flattening, even if on a very low level. Both cluster rotation and tidal fields are thought to cause this flattening. Nevertheless, has only been confirmed in handful of GCs, based mostly individual radial velocities at large radii. We conducting survey the central kinematics Galactic GCs using new Integral Field Unit instrument VIRUS-W. detect all 11 that we have observed so far, rendering it likely majority rotate. use published...
Observations of 170 local ($z\lesssim0.08$) galaxy clusters in the northern hemisphere have been obtained with Wendelstein Telescope Wide Field Imager (WWFI). We correct for systematic effects such as point-spread function broadening, foreground star contamination, relative bias offsets, and charge persistence. Background inhomogeneities induced by scattered light are reduced down to $\Delta {\rm SB} > 31~g'$ mag arcsec$^{-2}$ large dithering subtraction night-sky flats. Residual background...