A5037980522- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Particle Detector Development and Performance
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Statistics Education and Methodologies
- Astro and Planetary Science
- Mechanics and Biomechanics Studies
- SAS software applications and methods
- Adaptive optics and wavefront sensing
- X-ray Spectroscopy and Fluorescence Analysis
- CCD and CMOS Imaging Sensors
- Remote Sensing and LiDAR Applications
- Pulsars and Gravitational Waves Research
- 3D Surveying and Cultural Heritage
- Diamond and Carbon-based Materials Research
- Scientific Research and Discoveries
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
Excellence Cluster Origins
2021-2024
Max Planck Institute for Extraterrestrial Physics
2020-2024
Max Planck Institute for Astronomy
2024
Thüringer Landessternwarte Tautenburg
2024
Brera Astronomical Observatory
2024
University of Michigan–Ann Arbor
2024
University of Würzburg
1996
Context. In November 2019, eROSITA on board of the Spektrum-Roentgen-Gamma (SRG) observatory started to map entire sky in X-rays. After four-year survey program, it will reach a flux limit that is about 25 times deeper than ROSAT. During SRG performance verification phase, observed contiguous 140 deg 2 area down final depth all-sky (eROSITA Final Equatorial-Depth Survey; eFEDS), with goal obtaining census X-ray emitting populations (stars, compact objects, galaxies, clusters and active...
Context: After the successful launch of Spectrum-Roentgen-Gamma (SRG) mission in July 2019, eROSITA, soft X-ray instrument aboard SRG, performed scanning observations a large contiguous field, namely eROSITA Final Equatorial Depth Survey (eFEDS), ahead planned four-year all-sky survey. eFEDS yielded sample sources with very rich multi-band photometric and spectroscopic coverage. Aims: We present here Active Galactic Nuclei (AGN) catalog spectral properties sources. Methods: Using Bayesian...
The eROSITA Final Equatorial-Depth Survey (eFEDS), executed during the performance verification phase of Spectrum-Roentgen-Gamma (SRG)/eROSITA telescope, was completed in Nov. 2019. One science goals this survey is to demonstrate ability detect samples clusters and groups at final depth all-sky survey. Because sizeable point-spread function eROSITA, high-redshift galaxies or compact nearby hosting bright active galactic nuclei (AGN) can be misclassified as point sources by source detection...
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...
Context. High-redshift quasars signpost the early accretion history of Universe. The penetrating nature X-rays enables a less absorption-biased census population these luminous and persistent sources compared to optical/near-infrared colour selection. ongoing SRG/eROSITA X-ray all-sky survey offers unique opportunity uncover bright end high- z quasar probe new regions parameter space. Aims. We searched for within source detected in contiguous ~140 deg 2 field observed by eROSITA during...
We present the first study of nearby M dwarfs with ROentgen Survey an Imaging Telescope Array (eROSITA) on board Russian Spektrum-Roentgen-Gamma mission (SRG). To this end we extracted Gaia DR2 data for ~9000 in superblink proper motion catalog and calculated their stellar parameters from empirical relations optical-IR colors. cross-matched eROSITA Final Equatorial Depth (eFEDS) all-sky survey (eRASS1). Our sample consists 704 stars (SpT = K5-M7). This unprecedented base X-ray emitting...
Context. The eROSITA X-ray telescope on board the Spectrum-Roentgen-Gamma satellite has started to detect new sources over full sky at an unprecedented rate. Understanding performance and selection function of source detection is important for subsequent scientific analysis catalogs. Aims. Through simulations, we test optimize procedures, characterize detected catalog quantitatively. Methods. Taking Final Equatorial-Depth Survey (eFEDS) as example, ran extensive photon-event simulations...
Radio jets are present in a diverse sample of AGN. However, the mechanisms jet powering not fully understood, and it is yet unclear to what extent they obey mass-invariant scaling relations, similar those found for triggering fuelling X-ray selected We study incidence eROSITA/eFEDS LOFAR radio AGN as function several stellar mass normalised power indicators. A new from LOFAR-eFEDS survey defined we publicly release this catalogue, including host galaxy counterparts Legacy Survey DR9,...
We present JWST/NIRSpec integral field spectroscopy in the rest-frame optical bands of system PJ308–21, a quasar at z = 6.2342 caught as its host galaxy interacts with companion galaxies. detect spatially extended emission several lines (H α , H β [O III ], [N II [S and He ), which we used to study properties ionized phase interstellar medium: source hardness photoionizing radiation field, metallicity, dust reddening, electron density temperature, star formation. also marginally detected...
The eROSITA Final Equatorial-Depth Survey (eFEDS), covering ~140 square degrees, was performed as part of the performance verification phase telescope on board Russian-German satellite Spectrum-Roentgen-Gamma (SRG). In this paper we present optical follow-up 542 X-ray extent selected galaxy group and cluster candidates providing redshifts confirmation for full sample. We use imaging data from Hyper Suprime-Cam Subaru Strategic Program Legacy to run redshift tool MCMF well finder CAMIRA at...
Finding massive black holes (MBHs, M BH ≈ 10 4 –10 7 ⊙ ) in the nuclei of low-mass galaxies $\left( {{M_*}\mathop {\mathop < \limits_ }\limits_ {{10}^{10}}{M_ \odot }} \right)$ is crucial to constrain seeding and growth over cosmic time, but it particularly challenging due their low accretion luminosities. Variability selection via long-term photometric ultraviolet, optical, or infrared (UVOIR) light curves has proved effective identifies lower-Eddington ratios compared broad narrow...
We present a statistical analysis of the optical properties an X-ray selected Type 1 AGN sample, using high signal to-noise ratio ($S/N>20$) spectra counterparts ROSAT/2RXS sources in footprint SDSS-IV/SPIDERS (Spectroscopic IDentification eROSITA Sources) programme. The final sample contains 2100 sources. It significantly extends redshift and luminosity ranges ($\rm z \sim 0.01 - 0.80$ $\rm L_{0.1-2.4 \,keV}$ ~ 2.0 \times 10^{41}$ 1.0 10^{46} \, erg s^{-1}$ ) used so far this kind analysis....
Context. The soft excess, a surplus of X-ray photons below 2 keV with respect to power law, is feature debated physical origin found in the spectra many type-1 active galactic nuclei (AGN). eROSITA instrument aboard Spectrum-Roentgen-Gamma (SRG) mission will provide an all-sky census AGN. Spectral fitting these sources can help identify excess. Aims. Final Equatorial Depth Survey (eFEDS) field, designed mimic expected average equatorial depth survey, provides ideal sample test eROSITA....
Context. In the context of an evolutionary model, outflow phase active galactic nucleus (AGN) occurs at peak its activity, once central supermassive black hole (SMBH) is massive enough to generate sufficient power counterbalance potential well host galaxy. This feedback plays a vital role in galaxy evolution. Aims. Our aim this paper apply various selection methods isolate powerful AGNs phase, trace and characterise outflows these AGNs, explore link between AGN luminosity properties....
The eROSITA instrument aboard the Spectrum Roentgen Gamma (SRG) satellite has performed its first all-sky survey between December 2019 and June 2020. This paper presents resulting hard X-ray (2.3-5 keV) sample, created from an imaging in 2-8 keV band, for sources within western galactic sky. 5466 selected detected with are presented discussed. Bayesian statistics-based code NWAY is used to identify counterparts sources. These classified based on their multiwavelength properties, literature...
Quasi-Periodic Eruptions (QPEs) are extreme high-amplitude bursts of X-ray radiation recurring every few hours and originating near the central supermassive black holes in galactic nuclei. It is currently unknown what triggers these events, how long they last connected to physical properties inner accretion flows. Previously, only two such sources were known, found either serendipitously or archival data, with emission lines their optical spectra classifying nuclei as hosting an actively...
This study aims at identifying luminous quasars $z>5.7$ among X-ray-selected sources in the eROSITA Final Equatorial-Depth Survey (eFEDS) order to place a lower limit on black hole accretion well into epoch of re-ionisation. We confirm low significance detection with previously known, optically faint $z=6.56$ quasar from Subaru High-z Exploration Low-luminosity Quasars (SHELLQs) survey. obtained pointed follow-up observation source Chandra X-ray telescope detection. Using new near-infrared...
SMSS\,J114447.77-430859.3 ($z=0.83$) has been identified in the SkyMapper Southern Survey as most luminous quasar last $\sim 9\,\rm Gyr$. In this paper, we report on eROSITA/Spectrum-Roentgen-Gamma (SRG) observations of source from eROSITA All Sky Survey, along with presenting results recent monitoring performed using Swift, XMM-Newton, and NuSTAR. The shows a clear variability by factors 10$ 2.7$ over timescales year few days, respectively. When fit an absorbed power law plus high-energy...
The Spektrum-Roentgen-Gamma (SRG)/extended Roentgen Survey with an Imaging Telescope Array (eROSITA) All-Sky (eRASS) is expected to contain $ quasars that emitted their light when the universe was less than a billion years old, is, at $z>5.6$. By selection, these populate bright end of active galactic nuclei (AGN) X-ray luminosity function, and space density offers powerful demographic diagnostic parent super-massive black hole (SMBH) population. Of 400$ have been discovered $z>5.6$...
During its calibration and performance verification phase, the eROSITA instrument aboard Spectrum-RG satellite performed a uniform wide-area X-ray survey of approximately 140 deg2, known as Final Equatorial Depth Survey (eFEDS). The primary aim eFEDS is to demonstrate scientific be expected at end eight--pass all--sky survey. This will provide first focussed image whole sky in hard ($>2$ keV) bandpass. source population this energy range thus great interest, particularly for AGN studies....
Abstract The James Webb Space Telescope opens a new window to directly probe luminous quasars powered by billion solar mass black holes in the Epoch of Reionization and their coevolution with massive galaxies unprecedented details. In this paper, we report first results from deep NIRSpec integral field unit spectroscopic study quasar at z = 7.5. We obtain bolometric luminosity ∼1.8 × 10 47 erg s −1 hole ∼0.7–2.5 9 M ⊙ based on H β emission line spectrum. discover ∼2 kpc scale, highly...
Theoretical models of galaxy-AGN co-evolution ascribe an important role for the feedback process to a short, luminous, obscured, and dust-enshrouded phase during which accretion rate SMBH is expected be at its maximum associated AGN-driven winds are also predicted maximally developed. To test this scenario, we have isolated text-book candidate from eROSITA Final Equatorial-Depth Survey (eFEDS) obtained within Performance Verification program telescope on board Spectrum Roentgen Gamma. From...
Aims. We look to provide a detailed description of the SPectroscopic IDentification ERosita Sources (SPIDERS) survey, an SDSS-IV programme aimed at obtaining spectroscopic classification and redshift measurements for complete samples sufficiently bright X-ray sources. Methods. describe SPIDERS Point Source Spectroscopic Catalogue, considering its store 11 092 observed spectra drawn from parent sample 14 759 ROSAT XMM sources over area 5129 deg 2 covered in by eBOSS survey. Results. This...
Context. Radio jets are present in a diverse sample of AGN. However, the mechanisms jet powering not fully understood, and it remains unclear to what extent they obey mass-invariant scaling relations similar those found for triggering fuelling X-ray-selected Aims. We use multi-wavelength data eFEDS field observed by eROSITA/Spectrum-Roentgen-Gamma (SRG) LOFAR study incidence X-ray radio AGN as function several stellar mass ( M * )-normalised power indicators. Methods. From – survey, we...
We present JWST/NIRSpec Integral Field Spectroscopy in the rest-frame optical bands of system PJ308-21, a quasar at $z=6.2342$ caught as its host galaxy interacts with companion galaxies. detect spatially extended emission several lines (H$\alpha$, H$\beta$, [OIII], [NII], [SII], HeII), which we use to study properties ionized phase interstellar medium: source and hardness photoionizing radiation field, metallicity, dust reddening, electron density temperature, star formation. also...