V. Burwitz
A5084185702- Astrophysical Phenomena and Observations
- Advanced X-ray Imaging Techniques
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Adaptive optics and wavefront sensing
- Particle Detector Development and Performance
- X-ray Spectroscopy and Fluorescence Analysis
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Particle Accelerators and Free-Electron Lasers
- Calibration and Measurement Techniques
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Optical Systems and Laser Technology
- Advanced X-ray and CT Imaging
- CCD and CMOS Imaging Sensors
- Geophysics and Gravity Measurements
- Planetary Science and Exploration
Max Planck Institute for Extraterrestrial Physics
2015-2024
Universidade Federal de Uberlândia
2023
University of Central Florida
2023
University of Leicester
2023
Max Planck Society
2011-2021
Astronomical Observatory of Mallorca
2012
Max Planck Institute for Plasma Physics
2010
California Institute of Technology
2009
Leibniz Institute for Astrophysics Potsdam
2008
Universitätsmedizin Göttingen
1995-2001
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...
XIPE, the X-ray Imaging Polarimetry Explorer, is a mission dedicated to Astronomy. At time of writing XIPE in competitive phase A as fourth medium size ESA (M4). It promises reopen polarimetry window high energy Astrophysics after more than 4 decades thanks detector that efficiently exploits photoelectric effect and optics with large effective area. uniqueness time-spectrally-spatially- resolved breakthrough astrophysics fundamental physics. Indeed payload consists three Gas Pixel Detectors...
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...
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...
While a white dwarf is, from theoretical perspective, the most plausible primary star in Type Ia supernova (SN Ia), many other candidates have not been formally ruled out. Shock energy deposited envelope of any exploding contributes to early SN brightness and, since this radiation is degraded by expansion after explosion, diffusive luminosity depends on initial radius. We present new non-detection limit nearby 2011fe, obtained what appears be just 4 hours allowing us directly constrain...
Extended gas clouds have been previously detected surrounding the brightest known close-in transiting hot Jupiter exoplanets, HD 209458 b and 189733 b; we observed distant but more extreme system, WASP-12, with Hubble Space Telescope (HST). Near-UV (NUV) transits up to three times deeper than optical transit of WASP-12 reveal extensive diffuse gas, extending well beyond Roche lobe. The distribution absorbing varies between visits. deepest NUV are at wavelength ranges strong stellar...
We report the results of spectral analysis two observations Vela pulsar with Chandra X-ray observatory. The spectrum does not show statistically significant lines in observed 0.25-8.0 keV band. Similar to middle-aged pulsars detected thermal emission, consists distinct components. softer component can be modeled as a magnetic hydrogen atmosphere - for field $B=3\times 10^{12}$ G and neutron star mass $M=1.4 M_\odot$ radius $R^\infty =13$ km, we obtain $\tef^\infty =0.68\pm 0.03$ MK, $L_{\rm...
eXTP is a science mission designed to study the state of matter under extreme conditions density, gravity and magnetism. Primary goals are determination equation at supra-nuclear measurement QED effects in highly magnetized star, accretion strong-field regime gravity. targets include isolated binary neutron stars, strong magnetic field systems like magnetars, stellar-mass supermassive black holes. The carries unique unprecedented suite state-of-the-art scientific instruments enabling for...
As a novel X-ray focusing technology, lobster eye micro-pore optics (MPO) feature both wide observing field of view and true imaging capability, promising sky monitoring with significantly improved sensitivity spatial resolution in soft X-rays. Since first proposed by Angel (1979), the have been extensively studied, developed trialed over past decades. In this Letter, we report on first-light results from flight experiment Lobster Eye Imager for Astronomy ($LEIA$), pathfinder wide-field...
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...
In the first observation of Mars with XMM-Newton, on 20-21 November 2003, this planet is clearly detected as an X-ray source. High resolution spectroscopy Reflection Grating Spectrometer (RGS) confirms that radiation from composed two different components: one due to fluorescent scattering solar X-rays in its upper atmosphere and other wind charge exchange exosphere. Close Mars, RGS spectrum dominated by pronounced CO2 fluorescence lines at 23.5 Å 23.7 Å. Fluorescence N2 31.5 also observed....
In this work, we investigate the eclipse timing of polar binary HU Aquarii that has been observed for almost two decades. Recently, Qian et al. attributed large (O-C) deviations between ephemeris and observations to a compact system massive jovian companions. We improve Keplerian, kinematic model Light Travel Time (LTT) effect re-analyse whole currently available data set. add 60 new, yet unpublished, mostly precision light curves obtained using time high-resolution photo-polarimeter OPTIMA,...
To take advantage of the astrophysical potential Gamma-Ray Bursts (GRBs), Chinese and French astrophysicists have engaged SVOM mission (Space-based multi-band astronomical Variable Objects Monitor). Major advances in GRB studies resulting from synergy between space ground observations, implements instrumentation. The scientific objectives put a special emphasis on two categories GRBs: very distant GRBs at z$>$5 which constitute exceptional cosmological probes, faint/soft nearby allow...
We study the mid-egress eclipse timing data gathered for cataclysmic binary HU Aquarii during years 1993–2014. The (O−C) residuals were previously attributed to a single ∼7 Jupiter mass companion in ∼5 au orbit or stable two-planet system with an unconstrained outermost orbit. present 22 new observations between 2011 June and 2014 July four instruments around world. They reveal systematic deviation of ∼60–120 s from older ephemeris. re-analyse whole set available. Our results provide erratum...
The CERN Axion Solar Telescope (CAST) searches for $a\ensuremath{\rightarrow}\ensuremath{\gamma}$ conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward Sun. Two parallel bores filled with helium adjustable pressure to match x-ray refractive mass ${m}_{\ensuremath{\gamma}}$ axion search ${m}_{a}$. After vacuum phase (2003--2004), which is optimal ${m}_{a}\ensuremath{\lesssim}0.02\text{ }\text{ }\mathrm{eV}$, we used $^{4}\mathrm{He}$ 2005--2007...
Arcus will be proposed to the NASA Explorer program as a free-flying satellite mission that enable high-resolution soft X-ray spectroscopy (8-50) with unprecedented sensitivity – effective areas of >500 sq cm and spectral resolution >2500. The key science goals are (1) determine how baryons cycle in out galaxies by measuring effects structure formation imprinted upon hot gas is predicted lie extended halos around galaxies, groups, clusters, (2) black holes influence their surroundings...
The Follow-up X-ray telescope (FXT) is one of the instruments on board Einstein Probe (EP) satellite Chinese Academy Sciences (CAS) which was launched in January 2024. EP mission dedicated to study time-domain high-energy astrophysics, utilising a lobster-eye-based wide-field telescope, complemented by an eROSITA-like optics for follow-up observations. MPE has provided hardware and conducted measurement campaigns at its test facilities as part European contribution ESA, addition eROSITA...
Abstract The Einstein Probe (EP) mission, launched in 2024 January, is a time-domain X-ray satellite designed to discover and study transient burst sources while investigating electromagnetic counterparts gravitational waves. To achieve precise observations, EP features the Follow-up Telescope (FXT), equipped with two Wolter-I type mirrors for imaging within 1 square degree field of view. A specialized Ray-Tracing package FXT (RTF) was developed assess mirrors’ performance used FXT. By...
We present the Chandra LETGS X-ray spectrum of nearby ( pc) neutron star RXJ1856.5-3754. Detailed spectral analysis combined and optical data rules out nonmagnetic atmosphere models with hydrogen, helium, iron solar compositions. also conclude that strongly magnetized are unable to represent data. The can be explained a two-component blackbody model. harder component temperature eV radius km emitting region well fits interpreted as radiation from hot on star's surface.