A5058042267- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Particle Detector Development and Performance
- Galaxies: Formation, Evolution, Phenomena
- SAS software applications and methods
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Nuclear Physics and Applications
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- High-pressure geophysics and materials
- Mechanics and Biomechanics Studies
- Advanced X-ray Imaging Techniques
- Radiation Detection and Scintillator Technologies
Max Planck Institute for Extraterrestrial Physics
2016-2025
Max Planck Society
2006-2017
North Central College
2014
Max Planck Innovation
2013
University of Alabama in Huntsville
2011
University College Dublin
2011
Universities Space Research Association
2011
Los Alamos National Laboratory
2011
Marshall Space Flight Center
2011
California Institute of Technology
2006-2010
The Palomar Transient Factory (PTF) is a fully-automated, wide-field survey aimed at systematic exploration of the optical transient sky. performed using new 8.1 square degree camera installed on 48-inch Samuel Oschin telescope Observatory; colors and light curves for detected transients are obtained with automated 60-inch telescope. PTF uses eighty percent 1.2-m fifty 1.5-m time. With an exposure 60-s reaches depth approximately 21.3 in g' 20.6 R (5 sigma, median seeing). Four major...
The Palomar Transient Factory (PTF) is a wide-field experiment designed to investigate the optical transient and variable sky on time scales from minutes years. PTF uses CFH12k mosaic camera, with field of view 7.9 deg2 plate scale 1'' pixel-1, mounted Observatory 48 inch Samuel Oschin Telescope. operation strategy devised probe existing gaps in phase space search for theoretically predicted, but not yet detected, phenomena, such as fallback supernovae, macronovae,. Ia orphan afterglows...
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)...
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...
We present photometric redshifts and spectral energy distribution (SED) classifications for a sample of 1542 optically identified sources detected with XMM in the COSMOS field. Our template fitting classifies 46 as stars 464 nonactive galaxies, while remaining 1032 require templates an active galactic nucleus (AGN) contribution. High accuracy derived was accomplished result (1) photometry up to 30 bands high-significance detections, (2) new set SED templates, including 18 hybrids covering...
We report the discovery by Swift hard X-ray monitor of transient source J2058.4+0516 (Sw J2058+05). Our multi-wavelength follow-up campaign uncovered a long-lived (duration ≳ months), luminous (LX, iso ≈ 3 × 1047 erg s−1) and radio (νLν, 1042 counterpart. The associated optical emission, however, from which we measure redshift 1.1853, is relatively faint, this not due to large amount dust extinction in host galaxy. Based on numerous similarities with recently discovered GRB 110328A/Swift...
We present photometric and spectroscopic observations of SN 2007if, an overluminous (MV = −20.4), red (B − V 0.16 at B-band maximum), slow-rising (trise 24 days) type Ia supernova (SN Ia) in a very faint (Mg −14.10) host galaxy. A spectrum 5 days past maximum light is direct match to the super-Chandrasekhar-mass candidate 2003fg, showing Si ii C ∼9000 km s−1. high signal-to-noise co-addition spectral time series reveals no Na i D absorption, suggesting negligible reddening galaxy, late-time...
Observations of GRB 100724B with the Fermi Gamma-Ray Burst Monitor find that spectrum is dominated by typical Band functional form, which usually taken to represent a non-thermal emission component, but also includes statistically highly significant thermal spectral contribution. The simultaneous observation and components allows us confidently identify two components. fact these seem vary independently favors idea component photospheric origin while dominant occurs at larger radii. Our...
In this paper, we release accurate photometric redshifts for 1692 counterparts to Chandra sources in the central square degree of Cosmic Evolution Survey (COSMOS) field. The availability a large training set spectroscopic that extends faint magnitudes enabled comparable highest quality results presently available normal galaxies. We demonstrate morphologically extended, X-ray without optical variability are more accurately described by library galaxies (corrected emission lines) than active...
In this catalog we present the updated set of spectral analyses GRBs detected by Fermi Gamma-Ray Burst Monitor (GBM) during its first four years operation. It contains two types spectra, time-integrated fits and at brightest time bin, from 943 triggered GRBs. Four different models were fitted to data, resulting in a compendium more than 7500 spectra. The analysis was performed similarly, but not identically Goldstein et al. 2012. All 487 have been re-fitted using same methodology as that 456...
This is the second of a series catalogs gamma-ray bursts (GRBs) observed with Fermi Gamma-ray Burst Monitor (GBM). It extends first two-year catalog by two more years, resulting in an overall list 953 GBM triggered GRBs. The intention GRB to provide information community on most important observables detected For each location and main characteristics prompt emission, duration, peak flux fluence are derived. latter quantities calculated for 50 - 300 keV energy band, where maximum release...
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...
We report spectroscopic and photometric follow-up of a dormant black hole (BH) candidate from Gaia DR3. The system, which we call BH2, contains $\sim 1M_{\odot}$ red giant dark companion with mass $M_2 = 8.9\pm 0.3\,M_{\odot}$ that is very likely BH. orbital period, $P_{\rm orb} 1277$ days, much longer than any previously studied BH binary. Our radial velocity (RV) over 7-month period spans more 90% the orbit's dynamic range in RV excellent agreement predictions solution. UV imaging...
Stars that interact with supermassive black holes (SMBHs) can either be completely or partially destroyed by tides. In a partial tidal disruption event (TDE) the high-density core of star remains intact, and low-density, outer envelope is stripped feeds luminous accretion episode. The TDE AT2018fyk, an inferred hole mass $10^{7.7\pm0.4}$ M$_{\odot}$, experienced extreme dimming at X-ray (factor $>$6000) UV $\sim$15) wavelengths $\sim$500--600 days after discovery. Here we report on...
X-ray quasi-periodic eruptions (QPEs) are a novel addition to the group of extragalactic transients. With only select number known sources, and many more models published trying explain them, we so far limited in our understanding by small statistics. In this work, report discovery two further galaxies showing QPEs, hereafter named eRO-QPE3 eRO-QPE4, with eROSITA telescope on board Spectrum Roentgen Gamma observatory, followed XMM-Newton , NICER, Swift -XRT, SALT ( z = 0.024 0.044,...
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...
Abstract The Einstein Probe (EP) is an interdisciplinary mission of time-domain and X-ray astronomy. Equipped with a wide-field lobster-eye focusing imager, EP will discover cosmic transients monitor the variability known sources in 0.5–4 keV, at combination detecting sensitivity cadence that not accessible to previous current monitoring missions. can perform quick characterisation or outbursts Wolter-I telescope onboard. In this paper, science objectives are presented. expected enlarge...
With an extinction-corrected V-band peak absolute magnitude of about -22, supernova SN 2006gy is probably the brightest ever observed. We report on multiwavelength observations this and its environment. Our spectroscopy shows Hα emission line as well absorption features that may be identified Si II lines at low expansion velocity. The slow brightening, luminosity, resemble those observed in hybrid Type IIn/Ia SNe (also known IIa) suggest related to IIa class. host galaxy, NGC 1260, dominated...
We present systematic spectral analyses of GRBs detected by the Fermi Gamma-Ray Burst Monitor (GBM) during its first two years operation. This catalog contains types spectra extracted from 487 GRBs, and fitting four different models, this results in a compendium over 3800 spectra. The models were selected based on their empirical importance to shape many analysis performed was devised be as thorough objective possible. describe detail our procedure criteria for analyses, bulk form parameter...
Context. Thirteen years after the discovery of first afterglows, nature dark gamma-ray bursts (GRB) still eludes explanation: while each long-duration GRB typically has an X-ray afterglow, optical/NIR emission is only seen for 40–60% them.
(Abridged) Until recently the information inferred from gamma-ray burst follow-up observations was mostly limited to optically bright afterglows, biasing all demographic studies against sight-lines that contain large amounts of dust. Here, we present GRB afterglow and host for a sample bursts are exemplary previously missed ones because high visual extinction along sight-line. This facilitates an investigation properties, geometry location absorbing dust these poorly-explored galaxies,...
Fermi has provided the largest sample of γ-ray-selected blazars to date. In this work we use a uniformly selected set 211 BL Lacertae (BL Lac) objects detected by during its first year operation. We obtained redshift constraints for 206 out Lac in our sample, making it and most complete available literature. determine luminosity function evolution with cosmic time. find that classes is positive, space density peaking at modest (z ≈ 1.2). Low-luminosity, high-synchrotron–peaked (HSP) are an...
We release the AllWISE counterparts and Gaia matches to 106,573 17,665 X-ray sources detected in ROSAT 2RXS XMMSL2 surveys with |b|>15. These are brightest sky, but their position uncertainties sparse multi-wavelength coverage until now rendered identification of a demanding task uncertain results. New all-sky sufficient depth, like Gaia, new Bayesian statistics based algorithm, NWAY, allow us, for first time, provide reliable counterpart associations. NWAY extends previous distance sky...