A. E. Hornschemeier
A5035495817- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Advanced X-ray Imaging Techniques
- History and Developments in Astronomy
- Relativity and Gravitational Theory
- Radio Astronomy Observations and Technology
- Black Holes and Theoretical Physics
- Solar and Space Plasma Dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Geophysics and Gravity Measurements
- Particle Accelerators and Free-Electron Lasers
- Scientific Research and Discoveries
- Astro and Planetary Science
- Superconducting and THz Device Technology
- High-pressure geophysics and materials
Goddard Space Flight Center
2015-2025
Johns Hopkins University
2013-2024
Kyoto University
2022
University of Miyazaki
2020-2022
Deleted Institution
2007-2012
Pennsylvania State University
2000-2004
University of California, Davis
2004
Association of Universities For Research In Astronomy
2004
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates band from 3 to 79 keV, extending sensitivity of far beyond ∼10 keV cutoff achieved by all previous satellites. inherently low background associated with concentrating light enables probe hard sky a more than 100-fold improvement over collimated or coded mask instruments that have operated this bandpass. Using its unprecedented...
This special issue of the Astrophysical Journal Letters is dedicated to presenting initial results from Great Observatories Origins Deep Survey (GOODS) that are primarily, but not exclusively, based on multiband imaging data obtained with Hubble Space Telescope and Advanced Camera for Surveys (ACS). The survey covers roughly 320 arcmin2 in ACS F435W, F606W, F814W, F850LP bands, divided into two well-studied fields. Existing deep observations Chandra X-Ray Observatory ground-based facilities...
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 present catalogs for the ~2 Ms Chandra Deep Field-North, currently deepest X-ray observation of Universe in 0.5-8.0 keV band. Five hundred and three (503) sources are detected over an ~448 sq.arcmin area up to seven bands; 20 these lie Hubble Field-North. Source positions determined using matched-filter centroiding techniques; median positional uncertainty is ~0.3 arcsecs. The colors indicate a broad variety source types, although absorbed AGNs (including some possible Compton-thick...
[abridged] We present point-source catalogs for the 4Ms Chandra Deep Field-South (CDF-S), which is deepest survey to date and covers an area of 464.5 arcmin^2. provide a main source catalog, contains 740 X-ray point sources that are detected with wavdetect at false-positive probability threshold 1E-5 also satisfy binomial-probability source-selection criterion P<0.004; this approach designed maximize number reliable detected. A total 300 main-catalog new compared previous 2Ms CDF-S sources....
We present X-ray source catalogs for the $\approx7$ Ms exposure of Chandra Deep Field-South (CDF-S), which covers a total area 484.2 arcmin$^2$. Utilizing WAVDETECT initial detection and ACIS Extract photometric extraction significance assessment, we create main catalog containing 1008 sources that are detected in up to three bands: 0.5-7.0 keV, 0.5-2.0 2-7 keV. A supplementary is also provided including 47 lower-significance have bright ($K_s\le23$) near-infrared counterparts. identify...
An extremely deep X-ray survey (≈1 Ms) of the Hubble Deep Field North (HDF-N) and its environs (≈450 arcmin2) has been performed with Advanced CCD Imaging Spectrometer on board Chandra X-Ray Observatory. This is one two deepest surveys ever performed; for point sources near aim point, it reaches 0.5–2.0 2–8 keV flux limits ≈3 × 10-17 ≈2 10-16 ergs cm-2 s-1, respectively. Here we provide source catalogs, along details observations, data reduction, technical analysis. Observing conditions,...
We present an optical and NIR catalog for the X-ray sources in 2 Ms Chandra observation of Hubble Deep Field-North region. have high-quality multicolor images all 503 point reliable spectroscopic redshifts 284. spectroscopically identify six z>1 type II quasars. Our completeness R<24 is 87%. The redshift distribution shows two broad spikes that clearly grown over those originally seen 1 exposure. identified extragalactic already comprise 75% measured 2-8 keV light. Redshift slices...
We present results from the Hubble Higher z Supernova Search, first space-based open field survey for supernovae (SNe). In cooperation with Great Observatories Origins Deep Survey, we have used Space Telescope Advanced Camera Surveys to cover ~300 arcmin2 in area of Chandra Field South and North on five separate search epochs (separated by ~45 day intervals) a limiting magnitude F850LP ≈ 26. These deep observations allowed us discover 42 SNe redshift range 0.2 < 1.6. As these data span large...
We investigate the X-ray number counts in 1–2 Ms Chandra Deep Fields (CDFs) to determine contributions of faint source populations extragalactic background (XRB). sources were separated into active galactic nuclei (AGNs), star-forming galaxies, and Galactic stars primarily on basis their X-ray–to–optical flux ratios, optical spectral classifications, spectra, intrinsic luminosities. Number count slopes normalizations below 2 × 10-15 ergs cm-2 s-1 calculated each band for all types assuming a...
We present point-source catalogs for the ~2 Ms exposure of Chandra Deep Field-South (CDF-S); this is one two most-sensitive X-ray surveys ever performed. The survey covers an area ~436 arcmin^2 and reaches on-axis sensitivity limits ~1.9x10^{-17} ~1.3x10^{-16} ergs/cm^2/s 0.5-2.0 2-8 keV bands, respectively. Four hundred sixty-two point sources are detected in at least three bands that were searched; 135 these new compared to previous ~1 CDF-S detections. Source positions determined using...
In this paper we assess the relationship of population Active Galactic Nuclei (AGN) selected by hard X-rays to traditional AGN with strong optical emission lines. First, study emission-line properties a new X-ray sample 47 local (classified optically as both Type 1 and 2 AGN). We find that X- ray (3-20 keV) [OIII]$λ$5007 luminosities are well-correlated over range about four orders-of-magnitude in luminosity (mean ratio 2.15 dex standard deviation $σ$ = 0.51 dex). Second, 55 from literature...
We present results from a 221.9 ks Chandra exposure of the HDF-N and its vicinity, concentrating on 8.6' X 8.7' area covered by Caltech Faint Field Galaxy Redshift Survey (the `Caltech area'). The minimum detectable fluxes in 0.5-2 keV 2-8 bands are 1.3e-16 cgs 6.5e-16 cgs, respectively total 82 sources detected. More than 80% extragalactic X-ray background band is resolved. Redshifts available for 96% with R<23; redshift range 0.1-3.5 most having z < 1.5. Eight located itself, including two...
We present Chandra point-source catalogs for the Extended Deep Field-South (E-CDF-S) survey. The E-CDF-S consists of four contiguous 250 ks observations covering an approximately square region total solid angle ≈0.3 deg2, which flank existing ≈1 Ms (CDF-S). survey reaches sensitivity limits ≈1.1 × 10-16 and ≈6.7 ergs cm-2 s-1 0.5-2.0 2-8 keV bands, respectively. detect 762 distinct X-ray point sources within exposure; 589 these are new (i.e., not previously detected in CDF-S). This brings...
We present the optical, near-infrared, submillimeter, and radio follow-up catalog of X-ray–selected sources from an ≈1 Ms Chandra observation Hubble Deep Field North region. have B, V, R, I, z' magnitudes for 370 X-ray point sources, HK' 276, spectroscopic redshifts 182. high-quality spectra 175 these. The redshift distribution shows indications structures at z = 0.843 1.0175 (also detected in optical surveys), which could account a part field-to-field variation seen number counts; however,...
We present 0.5–2 keV, 2–8 4–8 and 0.5–8 keV (hereafter soft, hard, ultra-hard, full bands, respectively) cumulative differential number-count (log N–log S) measurements for the recently completed ≈4 Ms Chandra Deep Field-South (CDF-S) survey, deepest X-ray survey to date. implement a new Bayesian approach, which allows reliable calculation of number counts down flux limits that are factors ≈1.9–4.3 times fainter than previously investigations. In soft band (SB), most sensitive bandpass in...
The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by Institute Space and Astronautical Science (ISAS). will investigate physics high-energy universe performing high-resolution, high-throughput spectroscopy with moderate angular resolution. covers very wide energy range from 0.3 keV to 600 keV. allows combination band (5-80 keV) provided multilayer coating, focusing hard mirrors imaging detectors, high energy-resolution soft (0.3-12...
High redshift galaxies permit the study of formation and evolution X-ray binary populations on cosmological timescales, probing a wide range metallicities star-formation rates. In this paper, we present results from large scale population synthesis that models first universe until today. We use as input to our modeling Millennium II Cosmological Simulation updated semi-analytic galaxy catalog by Guo et al. (2011) self-consistently account for star history metallicity universe. Our modeling,...
The ASTRO-H mission was designed and developed through an international collaboration of JAXA, NASA, ESA, the CSA. It successfully launched on February 17, 2016, then named Hitomi. During in-orbit verification phase, on-board observational instruments functioned as expected. intricate coolant refrigeration systems for soft X-ray spectrometer (SXS, a quantum micro-calorimeter) imager (SXI, CCD) also However, March 26, operations were prematurely terminated by series abnormal events mishaps...
The first terrestrial gravitational wave interferometers have dramatically underscored the scientific value of observing Universe through an entirely different window, and folding this new channel information with traditional astronomical data for a multimessenger view. Laser Interferometer Space Antenna (LISA) will broaden reach astronomy by conducting survey millihertz sky, detecting tens thousands individual astrophysical sources ranging from white-dwarf binaries in our own galaxy to...
We present the results of NuSTAR and XMM-Newton observations two ultraluminous X-ray sources (ULX) NGC 1313 X-1 X-2. The combined spectral bandpass satellites enables us to produce first spectrum between 0.3 30 keV, while X-2 is not significantly detected by above 10 keV. data demonstrate that has a clear cutoff whose presence was only marginally detectable with previous observations. This rules out interpretation as black hole in standard low/hard state, it deeper than predicted for...
Abstract High-resolution X-ray spectroscopy with Hitomi was expected to resolve the origin of faint unidentified emission line reported in several low-resolution studies various massive systems, such as galaxies and clusters, including Perseus cluster. We have analyzed first-light observation The for based on XMM-Newton signal from large cluster sample under dark matter decay scenario is too be detectable data. However, previously 3.5 keV flux anomalously high compared sample-based...