P. Predehl
A5002377184- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Galaxies: Formation, Evolution, Phenomena
- Advanced X-ray Imaging Techniques
- Particle Detector Development and Performance
- Calibration and Measurement Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- CCD and CMOS Imaging Sensors
- Advanced X-ray and CT Imaging
- Astro and Planetary Science
- Dark Matter and Cosmic Phenomena
- Atomic and Molecular Physics
- Advanced Measurement and Metrology Techniques
Max Planck Institute for Extraterrestrial Physics
2014-2024
Max Planck Society
2008-2020
University of Tübingen
2010
Laboratoire d'Analyse et d'Architecture des Systèmes
2010
Max Planck Institute for Plasma Physics
2010
Halbleiterlabor of the Max-Planck-Society
1993
Max Planck Institute for Physics
1978-1992
Max Planck Institute for Astrophysics
1982-1992
Institute for Physics
1990
The European Photon Imaging Camera (EPIC) consortium has provided the focal plane instruments for three X-ray mirror systems on XMM-Newton. Two cameras with a reflecting grating spectrometer in optical path are equipped MOS type CCDs as detectors (Turner [CITE]), telescope full photon flux operates novel pn-CCD an imaging spectrometer. camera system was developed under leadership of Max-Planck-Institut für extraterrestrische Physik (MPE), Garching. concept is described well different...
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)...
Ultraluminous infrared galaxies (ULIRGs) are outstanding due to their huge luminosity output in the infrared, which is predominantly powered by super starbursts and/or hidden active galactic nuclei (AGN). NGC 6240 one of nearest ULIRGs and considered a key representative its class. Here, we report first high-resolution imaging spectroscopy X-rays. The observation, performed with ACIS-S detector aboard Chandra X-ray observatory, led discovery two hard nuclei, coincident optical-IR 6240. AGN...
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...
The orbital observatory Spectrum-Roentgen-Gamma (SRG), equipped with the grazing-incidence X-ray telescopes Mikhail Pavlinsky ART-XC and eROSITA, was launched by Roscosmos to Lagrange L2 point of Sun–Earth system on July 13, 2019. launch carried out from Baikonur Cosmodrome a Proton-M rocket DM-03 upper stage. German telescope eROSITA installed SRG under an agreement between Roskosmos DLR, Aerospace Agency. In December 2019, started perform its main scientific task: scanning celestial sphere...
Context. The eROSITA X-ray telescope on board the Spectrum-Roentgen-Gamma (SRG) observatory combines a large field of view and collecting area in energy range $\sim$0.2 to $\sim$8.0 keV with capability perform uniform scanning observations sky areas. Aims. SRG/eROSITA performed $\sim$140 square degrees Final Equatorial Depth Survey (eFEDS) as part its performance verification phase. observing time was chosen slightly exceed depth equatorial fields after completion all-sky survey. We present...
The eROSITA telescope array aboard the Spektrum Roentgen Gamma (SRG) satellite began surveying sky in December 2019, with aim of producing all-sky X-ray source lists and maps an unprecedented depth. Here we present catalogues both point-like extended sources using data acquired first six months survey operations (eRASS1; completed June 2020) over half whose proprietary rights lie German Consortium. We describe observation process, analysis pipelines, characteristics sources. With nearly 930...
Clusters of galaxies can be used as powerful probes to study astrophysical processes on large scales, test theories the growth structure, and constrain cosmological models. The driving science goal SRG/eROSITA All-Sky Survey is assemble a sample X-ray clusters with well-defined selection function determine evolution mass and, hence, parameters. We present here catalog 12 247 optically confirmed galaxy groups detected in 0.2–2.3 keV extended sources 13 116 deg 2 region western Galactic half...
The evolution of the cluster mass function traces growth linear density perturbations, providing valuable insights into structures, nature dark matter, and cosmological parameters governing Universe. primary science goal eROSITA, on board Spectrum Roentgen Gamma (SRG) mission, is to constrain cosmology through function. In this paper, we present a set constraints obtained from 5259 clusters galaxies detected over an area 12791 deg 2 in western Galactic hemisphere eROSITA’s first All-Sky...
The High Energy X-ray Probe (HEX-P) is a proposed NASA probe-class mission that combines the power of high angular resolution with broad bandpass to provide necessary leap in capabilities address important astrophysical questions next decade. HEX-P achieves breakthrough performance by combining technologies developed experienced international partners. To meet science goals, payload consists suite co-aligned telescopes designed cover 0.2–80 keV bandpass. Telescope (HET) has an effective 2–80...
The ROSAT telescope is equipped with two different kinds of X-ray image converters: redundant position sensitive proportional counters (PSPC) and one high resolution imager (HRI), based on microchannel plates. detectors part their front-end electronics as well the gas supply system for PSPC's are mounted onto a carrousel, which allows positioning desired in focus telescope. All instruments, electronics, mechanisms, etc. accommodated focal plane housing, to optical bench mirror system....
The deepest XMM–Newton mosaic map of the central 1| $_{.}^{\circ}$|5 Galaxy is presented, including a total about 1.5 Ms EPIC-pn cleaned exposures in 15 arcsec and 200 ks outside. This compendium presents broad-band X-ray continuum maps, soft intensity decomposition into spectral components comparison maps with emission at other wavelengths. Newly discovered extended features, such as supernova remnants (SNRs), superbubbles filaments are reported. We provide an atlas features within ±1° Sgr...
The eROSITA Final Equatorial-Depth Survey has been carried out during the PV phase of SRG/eROSITA telescope and completed in November 2019. This survey is designed to provide first eROSITA-selected sample galaxy clusters groups test predictions for all-sky context cosmological studies with clusters. In 140 deg$^2$ area covered by eFEDS, 542 candidate are detected as extended X-ray sources, down a flux $\sim10^{-14} $erg/s/cm$^2$ soft band (0.5-2 keV) within 1'. this work, we catalog eFEDS....
The first SRG/eROSITA All-Sky Survey (eRASS1) provides the largest intracluster medium-selected galaxy cluster and group catalog covering western Galactic hemisphere. Compared to samples selected purely on X-ray extent, sample purity can be enhanced by identifying candidates using optical near-infrared data from DESI Legacy Imaging Surveys. Using red-sequence-based finder eROMaPPer , we measured individual photometric properties (redshift z λ richness center, BCG position) for 12000 eRASS1...
Context . The first eROSITA all-sky survey (eRASS1) performed on board the Spectrum-Roentgen-Gamma mission (SRG) provides more than 900 000 X-ray sources in 0.2–2.3 keV band located western hemisphere. Aims We present identifications of eRASS1 obtained using our HamStar method, which was designed for identification coronal sources. Methods is a Bayesian framework that estimates probabilities each source based cross-match with optical counterparts from Gaia DR3. It considers geometric...
Number counts of galaxy clusters across redshift are a powerful cosmological probe, if precise and accurate reconstruction the underlying mass distribution is performed -- challenge called calibration. With advent wide deep photometric surveys, weak gravitational lensing by has become method choice to perform this measurement. We measure validate (WL) signature in shape galaxies observed first 3 years DES Y3 caused selected all-sky survey SRG/eROSITA. These data then used determine scaling...
We present results of the analysis data collected in 57-ks XMM-Newton and 505-ks Chandra observations nearby (120 pc) isolated neutron star RX J1856.5–3754. confirm most statements made by Burwitz et al. (2001) who discussed original 55-ks data. Detailed spectral combined X-ray optical rules out currently available nonmagnetic light heavy element atmosphere (LTE) models with hydrogen, helium, iron solar compositions. find that strongly magnetized also are unable to represent The show no...
We present the first X-ray spectrum obtained by Low-Energy Transmission Grating Spectrometer (LETGS) aboard Chandra X-Ray Observatory. The is of Capella and covers a wavelength range 5-175 Å (2.5-0.07 keV). measured resolution, which in good agreement with ground calibration, Deltalambda approximately 0.06 (FWHM). Although in-flight calibration LETGS progress, high spectral resolution unique coverage are well demonstrated results from Capella, coronal source rich emission lines. While...
We report the high S/N observation on October 3, 2002 with XMM-Newton of brightest X-ray flare detected so far from SgrA* a duration shorter than one hour (~ 2.7 ks). The light curve is almost symmetrical respect to peak flare, and no significant difference between soft hard range detected. overall spectrum well represented by an absorbed power-law photon spectral index Gamma=2.5+/-0.3, 2-10 keV luminosity 3.6 (+0.3-0.4) x 10^35 erg/s, i.e. factor 160 higher Sgr A* quiescent value. No change...
In recent years, indirect evidence has emerged suggesting that many nearby nonactive galaxies harbor quiescent supermassive black holes. Knowledge of the frequency occurrence holes, their masses and spins, is broad relevance for studying hole growth galaxy active galactic nuclei formation evolution. It been suggested an unavoidable consequence existence best diagnostic presence in galaxies, would be occasional tidal disruption stars captured by These events manifest themselves form luminous...
We have analysed the light curve of two brightest X-ray flares from Galactic Center black hole, one flare observed by XMM-Newton on October 3, 2002 (Porquet et al. 2003), and other Chandra 26, 2000 (Baganoff 2001). The power density spectra show five distinct peaks at periods ~ 100 s, 219 700 1150 2250 s common to both observations within their estimated measurement uncertainties. spectrum recently reported infrared June 16, 2003 (Genzel 2003) shows two, if not three, (including 1008 +/- 120...
Context. Our Galaxy hosts at its dynamical center Sgr A*, the closest supermassive black hole. Surprisingly, luminosity is several orders of magnitude lower than Eddington luminosity. However, recent observations occasional rapid X-ray flares from A* provide constraints on accretion and radiation mechanisms work close to event horizon.