A5080253287- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Spectroscopy and Laser Applications
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Astrophysics and Star Formation Studies
- Atmospheric and Environmental Gas Dynamics
- Gamma-ray bursts and supernovae
- Atmospheric chemistry and aerosols
- Silicon Carbide Semiconductor Technologies
- Adaptive optics and wavefront sensing
- Impact of Light on Environment and Health
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Semiconductor materials and devices
- Astrophysical Phenomena and Observations
- GNSS positioning and interference
- Advancements in Semiconductor Devices and Circuit Design
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Atmospheric aerosols and clouds
- Manufacturing Process and Optimization
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2018-2025
University of Augsburg
2018-2025
Robert Bosch (Germany)
2011-2023
Universität Innsbruck
2010-2019
Robert Bosch (Taiwan)
2014-2016
Nagoya University
2014
Osaka Sangyo University
2014
Laboratoire d’Astrophysique de Marseille
2008-2014
Nanjing Library
2013
Vatican Secret Archives
2013
<i>Aims. <i/>Photometric data of galaxies covering the rest-frame wavelength range from far-UV to far-IR make it possible derive galaxy properties with a high reliability by fitting attenuated stellar emission and related dust at same time.<i>Methods. <i/>For this purpose we wrote code CIGALE (Code Investigating GALaxy Emission) that uses model spectra composed Maraston (or PEGASE) population models, synthetic attenuation functions based on modified Calzetti law, spectral line templates,...
Context: The interaction of the light from astronomical objects with constituents Earth's atmosphere leads to formation telluric absorption lines in ground-based collected spectra. Correcting for these lines, mostly affecting red and infrared region spectrum, usually relies on observations specific stars obtained close time airmass science targets, therefore using precious observing time. Aims: We present molecfit, a tool correcting based synthetic modelling atmospheric transmission....
Context: Absorption by molecules in the Earth's atmosphere strongly affects ground-based astronomical observations. The resulting absorption line strength and shape depend on highly variable physical state of atmosphere, i.e. pressure, temperature, mixing ratio different involved. Usually, supplementary observations so-called telluric standard stars (TSS) are needed to correct for this effect, which is expensive terms telescope time. We have developed software package molecfit provide...
The Earth's atmosphere affects ground-based astronomical observations. Scattering, absorption, and radiation processes deteriorate the signal-to-noise ratio of data received. For scheduling observations it is, therefore, important to accurately estimate wavelength-dependent effect on observed flux. In order increase accuracy exposure time calculator European Southern Observatory's (ESO) Very Large Telescope (VLT) at Cerro Paranal, an atmospheric model was developed as part Austrian ESO...
We investigate how the [O II] properties and morphologies of galaxies in clusters groups at z = 0.4–0.8 depend on projected local galaxy density, compare with field similar redshifts low z. In both nearby distant clusters, higher density regions contain proportionally fewer star-forming galaxies, average equivalent width is independent density. However, current star formation rate (SFR) seems to peak densities ~15-40 Mpc−2. At odds low-z results, high relation between fraction varies from...
We study dust attenuation at UV wavelengths high redshift, where the is redshifted to observed visible. In particular, we search for a bump and related implications determinations. use data in CDFS, obtained intermediate broad band filters by MUSYC project, sample rest-frame of 751 galaxies with 0.95<z<2.2. When available, Herschel/PACS (GOODS-Herschel project), Spitzer/MIPS measurements, are used estimate emission. The SED each source fit using CIGALE code. amount curve as outputs fitting...
The largest natural source of light at night is the Moon, and it major contributor to astronomical sky background. Being able accurately predict background, including scattered moonlight important for scheduling observations. We have developed an improved model, in which components are computed with a better physical understanding as opposed simple empirical fit frequently used photometric model Krisciunas & Schaefer (1991). Our spectroscopic can trace spectral trends any position Moon...
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...
Post-starburst (E+A or k+a) spectra, characterized by their exceptionally strong Balmer lines in absorption and the lack of emission lines, belong to galaxies which star formation (SF) activity ended abruptly sometime during past Gyr. We perform a spectral analysis clusters, groups, poor field at z = 0.4–0.8 based on ESO Distant Cluster Survey. find that incidence k+a these redshifts depends strongly environment. K+a's reside preferentially clusters and, unexpectedly, subset σ 200–400 km s−1...
We study the evolution of spectral early-type galaxies in clusters, groups and field up to redshift 0.9 using EDisCS dataset. measure Re, Ie, sigma for 154 cluster 68 galaxies. zero point fundamental plane (FP) confirm results literature, but now also low velocity dispersion regime. The mass-to-light ratio varies as Delta log M/L_B=(-0.54+-0.01)z=(-1.61+-0.01)log(1+z) independent their dispersion. is stronger (Delta M/L_B=(-0.76+-0.01)z=(-2.27+-0.03)log(1+z)) FP residuals correlate with...
We present K-band data for the brightest cluster galaxies (BCGs) from ESO Distant Cluster Survey (EDisCS). These are combined with photometry published by Aragón-Salamanca, Baugh & Kauffmann and a low-redshift comparison sample built BCG catalogue of von der Linden et al. luminosities measured inside metric circular aperture 37 kpc diameter. In agreement previous studies, we find that Hubble diagram BCGs exhibits very low scatter (∼0.35) over redshift range 0 < z 1. The colour rest-frame...
<i>Aims. <i/>The properties of dust attenuation at rest-frame UV wavelengths are inferred from very high-quality FORS 2 spectra 78 galaxies the GMASS survey redshift . These objects complement a previously investigated sample 108 UV-luminous, intermediate-mass (i.e., with stellar masses ~) similar redshifts, selected FDF spectroscopic survey, K20 and GDDS. Detection broad absorption feature centred on about 2175 Å ("UV bump") implies that average extinction curve galaxy more closely...
Using the Very Large Telescope in Multi Object Spectroscopy mode, we have observed a sample of 113 field spiral galaxies FORS Deep Field (FDF) with redshifts range . The were selected based on apparent brightness () and encompass all late spectrophotometric types from Sa to Sdm/Im. Spatially resolved rotation curves been extracted for 77 fitted synthetic velocity fields taking into account observational effects inclination slit misalignment seeing width. We also compared different shapes...
The Cosmic Evolution Survey (COSMOS) allows for the first time a highly significant census of environments and structures up to redshift 1, as well full morphological description galaxy population. In this paper we present study aimed constrain evolution, in range 0.2 < z 1.2, mass content different types its dependence on environmental density. We use deep multicolor catalog, covering an area ∼0.7 deg2 inside COSMOS field, with accurate photometric redshifts (i 26.5 Δz/(zspec + 1) ≈ 0.035)....
A significant fraction of the high-redshift galaxies show strong Lyman emission lines. For redshifts z>5, most known belong to this class. However, so far not much is about physical structure and nature these objects. Our aim analyse alpha in a sample UV-continuum selected derive conditions that determine profile line strength. VLT/FORS spectra with resolution R ~ 2000 16 redshift range z = 2.7 5 are presented. The observed profiles compared theoretical models. lines from pure absorption...
We present a comprehensive analysis of the stellar population properties and morphologies red-sequence galaxies in 24 clusters groups from to . The dataset, consisting 215 spectra drawn ESO Distant Cluster Survey, constitutes largest spectroscopic sample at these redshifts for which such an has been conducted. Analysis reveals that evolution depend on their mass: while most massive are well described by passive high-redshift formation, those less consistent with more extended star-formation...
Aims. We present spectroscopic observations of galaxies in 15 survey fields as part the ESO Distant Cluster Survey (EDisCS). determine redshifts and velocity dispersions galaxy clusters located these fields, we test for possible substructure clusters.
We introduce a fast Markov Chain Monte Carlo (MCMC) exploration of the astrophysical parameter space using modified version publicly available code Code Investigating GALaxy Emission (CIGALE). The original CIGALE builds grid theoretical spectral energy distribution (SED) models and fits to photometric fluxes from ultraviolet infrared put constraints on parameters related both formation evolution galaxies. Such grid-based method can lead long challenging extraction since computation time...
Airglow emission lines, which dominate the optical-to-near-IR sky radiation, show strong, line-dependent variability on various time scales. Therefore, subtraction of background in affected wavelength regime becomes a problem if plain spectra have to be taken at different as astronomical data. A solution this issue is physically motivated scaling airglow lines data fit object spectrum. We developed corresponding instrument-independent approach based one-dimensional spectra. Our code skycorr...
While the near-infrared wavelength regime is becoming more and important for astrophysics there a marked lack of spectrophotometric standard star data that would allow flux calibration such data. Furthermore, calibrating medium- to high-resolution \'echelle spectroscopy challenging even in optical range, because available are often too coarsely sampled. We will provide reference users derive response curves from 300nm 2500nm spectroscopic medium high resolution, including those taken with...
We present the B-band Tully-Fisher relation (TFR) of 60 late-type galaxies with redshifts 0.1-1. The were selected from FORS Deep Field a limiting magnitude R = 23. Spatially resolved rotation curves derived spectra obtained FORS2 at Very Large Telescope. High-mass vmax ≳ 150 km s-1 show little evolution, whereas least massive systems in our sample are brighter by ~1-2 mag compared their local counterparts. For entire distant sample, TFR slope is flatter than for field (-5.77 ± 0.45 vs....