A5066501440- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray Imaging Techniques
- Solar and Space Plasma Dynamics
- Atomic and Molecular Physics
- Adaptive optics and wavefront sensing
- Scientific Measurement and Uncertainty Evaluation
- Nuclear Physics and Applications
- History and Developments in Astronomy
- Radio Astronomy Observations and Technology
- Medical Imaging Techniques and Applications
- Dark Matter and Cosmic Phenomena
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
Joint Space Science Institute
2016-2025
University of Maryland, College Park
2016-2025
University of Miyazaki
2024
Tokyo University of Science
2020-2024
Center for Astrophysics Harvard & Smithsonian
2019-2022
Michigan United
2022
University of Michigan–Ann Arbor
2022
Liceo scientifico statale Ulisse Dini
2020
Japan Aerospace Exploration Agency
2020
Max Planck Institute for Astronomy
2018-2019
The Swift mission, scheduled for launch in 2004, is a multiwavelength observatory gamma-ray burst (GRB) astronomy. It first-of-its-kind autonomous rapid-slewing satellite transient astronomy and pioneers the way future rapid-reaction missions. will be far more powerful than any previous GRB observing 100 bursts yr-1 performing detailed X-ray UV/optical afterglow observations spanning timescales from 1 minute to several days after burst. objectives are (1) determine origin of GRBs, (2)...
High-sensitivity wide-band X-ray spectroscopy is the key feature of Suzaku observatory, launched on 2005 July 10. This paper summarizes spacecraft, in-orbit performance, operations, and data processing that are related to observations. The scientific instruments, high-throughput telescopes, CCD cameras, non-imaging hard detector also described.
We have found compact X-ray sources in the center of 21 (54%) 39 nearby face-on spiral and elliptical galaxies with available ROSAT HRI data. luminosities (0.2 - 2.4 keV) these are ~ 1e37 1e40 erg/s (with a mean 3e39 erg/s. The displacement between location source optical photometric galaxy is 390 pc. fact that nuclear were nearly all (five six) previous evidence for black hole or an AGN indicates at least some accreting supermassive holes. ASCA spectra six show presence hard component...
We present evidence for widespread relativistic effects in the central regions of active galactic nuclei. In a sample 18 Seyfert 1 galaxies observed by ASCA, 14 show an iron Kα line that is resolved, with mean width σKα = 0.43 ± 0.12 keV Gaussian profile (full at half-maximum, FWHM ~ 50,000 km s-1). However, many profiles are asymmetric. A strong red wing indicative gravitational redshifts close to black hole, and accretion disk models provide excellent description data.
We present the catalog of sources detected in 70 months observations with Burst Alert Telescope (BAT) hard X-ray detector on Swift gamma-ray burst observatory. The Swift-BAT month survey has 1171 (more than twice as many previous 22 survey) 14–195 keV band down to a significance level 4.8σ, associated 1210 counterparts. is most sensitive and uniform all-sky reaches flux 1.03 × 10−11 erg s−1 cm−2 over 50% sky 1.34 90% sky. majority new continue be active galactic nuclei, 700 catalog. As part...
We present detailed spatially-resolved spectroscopy results of the observation Abell 1835 using European Photon Imaging Cameras (EPIC) and Reflection Grating Spectrometers (RGS) on XMM-Newton observatory. is a luminous (1046 ergs ), medium redshift (), X-ray emitting cluster galaxies. The observations support interpretation that large amounts cool gas are in multi-phase surrounded by hot ( keV) outer envelope. detect O VIII Lyα two Fe XXIV complexes RGS spectrum. emission measure below keV...
We present the first in a series of papers describing X-ray properties sample 18 Seyfert 1 galaxies, using data obtained by ASCA. The imaging reveal number serendipitous hard sources some source fields, but none contribute significantly to flux active galactic nuclei. All one Seyferts show evidence for variability on timescales minutes hours, with amplitude anticorrelated luminosity, confirming previous results. In at least eight there is that below 2 keV greater than band, perhaps...
We use highly spectroscopically complete deep and wide-area Chandra surveys to determine the cosmic evolution of hard X-ray-selected AGNs. X-ray luminosity functions (HXLFs) for all spectral types broad-line AGNs (BLAGNs) alone. At z<1.2, both are well described by pure evolution. Thus, drop in almost an order magnitude over this redshift range. show that observed is due AGN downsizing. directly compare our BLAGN HXLFs with optical QSO LFs find do not probe faint enough see downturn...
view Abstract Citations (623) References (58) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A complete X-ray sample of the high-latitude (b)-20 sky from HEAO 1 A-2 : log N-log S and luminosity functions. Piccinotti, G. ; Mushotzky, R. F. Boldt, E. A. Holt, S. Marshall, Serlemitsos, P. J. Shafer, An all-sky survey sources was performed, to a limiting sensitivity 3.1 x 10 -11 ergs/sq cm/s in 2-10 keV band. The has allowed construction functions based on...
We present a catalog of hard X-ray sources detected in the first 105 months observations with Burst Alert Telescope (BAT) coded mask imager on board Swift observatory.The month -BAT survey is uniform all-sky sensitivity 8.40×10 -12 erg s -1 cm -2 over 90% sky and 7.24 × 10 50% 14 -195 keV band.The provides 1632 (422 new detections) band above 4.8σ significance level.Adding to previously known sources, 34% (144/422) detections are identified as Seyfert AGN nearby galaxies (z < 0.2).The...
Aims.We present a uniform catalog of the images and radial profiles temperature, abundance, brightness for 70 clusters galaxies observed by XMM-Newton.
We study the fraction of dual AGN in a sample 167 nearby (z<0.05), moderate luminosity, ultra hard X-ray selected from all-sky Swift BAT survey. Combining new Chandra and Gemini observations together with optical observations, we find that frequency at scales <100 kpc is 10% (16/167). Of 16 AGN, 3 (19%) were detected using spectroscopy not emission line diagnostics. Close (<30 kpc) tend to be more common among most luminous systems. In luminosity both increases strongly decreasing...
In the 1960s, novel and increasingly powerful observational techniques opened up field of high-energy astrophysics. Cosmology started to become an empirical science, there was a resurgence in study general relativity. Martin Rees became ...Read More
A high spectral resolution observation of the diffuse X-ray background in 60-1000 eV energy range has been made using an array 36 1 mm2 microcalorimeters flown on a sounding rocket. Detector ranged from 5 to 12 FWHM, and composite spectrum ~1 sr centered at l = 90°, b +60° was obtained with net ~9 eV. The target area includes bright keV regions but avoids Loop I North Polar Spur. Lines C VI, O VII, VIII are clearly detected intensities 5.4 ± 2.3, 4.8 0.8, 1.6 0.4 photons cm-2 s-1 sr-1,...
The initial results from XMM-Newton observations of the rich cluster galaxies Abell 1795 are presented. spatially-resolved X-ray spectra taken by European Photon Imaging Cameras (EPIC) show a temperature drop at radius $\sim 200$ kpc center, indicating that ICM is cooling. Both EPIC and Reflection Grating Spectrometers (RGS) extracted center can be described an isothermal model with 4$ keV. volume emission measure any cool component ($<1$ keV) less than few % hot center. A strong OVIII...
(Abridged) We present the results from a detailed analysis of 0.6 - 10 keV spectra 23 ASCA observations 18 objects. find that in most cases underlying continuum can be well-represented by powerlaw with photon index Gamma approx 2. However we strong evidence for photoionized gas line-of-sight to 13/18 modelling this based upon ION photoionization code. X-ray ionization parameter ionized material is strongly peaked at Ux 0.1. The column densities are typically range N_{H,z} 10^{21}--10^{23}...
We present a study of the intrinsic absorption lines in ultraviolet spectra Seyfert 1 galaxies. The is based on from Hubble Space Telescope and includes galaxies observed with Faint Object Spectrograph Goddard High-Resolution at spectral resolutions λ/Δλ ≈1000-20,000 good signal-to-noise ratios. find that fraction show associated their active nuclei more than one-half (10 17), which much higher previous estimates (3%-10%) IUE data. There one-to-one correspondence between UV X-ray "warm...
We present results from a 900 ks exposure of NGC 3783 with the High-Energy Transmission Grating Spectrometer on board Chandra X-Ray Observatory. The resulting X-ray spectrum, which covers 0.5-10 keV energy range, has best combination signal-to-noise ratio and resolution ever obtained for an AGN. This spectrum reveals absorption lines H-like He-like ions N, O, Ne, Mg, Al, Si, S. There are also possible Ar Ca as well C. identify inner-shell lower ionization such Si VII-Si XII S XII-S XIV. iron...
view Abstract Citations (384) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The diffuse X-ray background spectrum from 3 to 50 keV. Marshall, F. E. ; Boldt, A. Holt, S. Miller, R. B. Mushotzky, Rose, L. Rothschild, Serlemitsos, P. J. of the extragalactic has been measured with GSFC Cosmic Experiment on HEAO 1 for regions sky away known point sources and more than 20 deg galactic plane. A total exposure 80 sq m-s-sr is available at present....
We present the results of analysis first 9 months data Swift BAT survey AGN in 14-195 keV band. Using archival X-ray or follow-up XRT observations, we have identified 129 (103 AGN) 130 objects detected at |b|> 15 deg and with significance >4.8 sigma. One source remains unidentified. These same allowed measurement properties objects. fit a power law to log N - S distribution, find slope be 1.42+/-0.14. Characterizing differential luminosity function as broken law, break L_*(erg/s) =...