Andrew E. Szymkowiak
A5027053198- Superconducting and THz Device Technology
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Particle Detector Development and Performance
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- X-ray Spectroscopy and Fluorescence Analysis
- Astrophysics and Star Formation Studies
- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Thermal Radiation and Cooling Technologies
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Advanced Thermodynamic Systems and Engines
- Advanced X-ray Imaging Techniques
- Pulsars and Gravitational Waves Research
- Adaptive optics and wavefront sensing
- Atomic and Molecular Physics
- thermodynamics and calorimetric analyses
- Nuclear Physics and Applications
Yale University
2014-2024
Goddard Space Flight Center
1995-2024
Japan Aerospace Exploration Agency
2010-2024
Tokyo Metropolitan University
2018-2024
Institute of Space and Astronautical Science
2024
Lawrence Livermore National Laboratory
2016-2022
Kanazawa University
2018
Fermi Research Alliance
2010
Hampton University
2010
Thomas Jefferson National Accelerator Facility
2010
The CHIRON optical high-resolution echelle spectrometer was commissioned at the 1.5 m telescope CTIO in 2011. instrument designed for high throughput and stability, with goal of monitoring radial velocities bright stars precision cadence discovery low-mass exoplanets. Spectral resolution R = 79 000 is attained when using a slicer total (including detector) efficiency 6% or higher, while 136 available stars. A fixed spectral range 415–880 nm covered. grating housed vacuum enclosure...
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,...
We present the overall design and performance of Astro-H (Hitomi) Soft X-Ray Spectrometer (SXS). The instrument uses a 36-pixel array x-ray microcalorimeters at focus grazing-incidence mirror Telescope (SXT) for high-resolution spectroscopy celestial sources. was designed to achieve an energy resolution better than 7 eV over 0.3-12 keV range operate more 3 years in orbit. actual is 4-5 as demonstrated during extensive ground testing prior launch measured mass flow rate liquid helium cryogen...
Abstract Measured spectral shifts due to intrinsic stellar variability (e.g., pulsations, granulation) and activity spots, plages) are the largest source of error for extreme-precision radial-velocity (EPRV) exoplanet detection. Several methods designed disentangle signals from true center-of-mass planets. The Extreme-precision Spectrograph (EXPRES) Stellar Signals Project (ESSP) presents a self-consistent comparison 22 different tested on same spectroscopic data EXPRES. Methods derived new...
Abstract The X-Ray Spectrometer (XRS) has been designed to provide the Suzaku Observatory with non-dispersive, high-resolution X-ray spectroscopy. As designed, instrument covers energy range 0.3 12 keV, which encompasses most diagnostically rich part of band. sensor consists a 32-channel array microcalorimeters, each an resolution about 6 eV. very low temperature required for operation (60 mK) is provided by four-stage cooling system containing single-stage adiabatic demagnetization...
view Abstract Citations (173) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-ray spectral constraints on the broad-line cloud geometry of NGC 4151. Holt, S. ; Mushotzky, R. F. Becker, H. Boldt, E. A. Serlemitsos, P. J. Szymkowiak, White, N. data from 4151 taken with Einstein Solid-State Spectrometer (SSS) and HEAO 1 A-2 experiment cannot be simply reconciled absorption a uniform column cold gas. The SSS can, however, explained in terms...
The EXtreme PREcision Spectrograph (EXPRES) is an optical fiber fed echelle instrument being designed and built at the Yale Exoplanet Laboratory to be installed on 4.3-meter Discovery Channel Telescope operated by Lowell Observatory. primary science driver for EXPRES detect Earth-like worlds around Sun-like stars. With this in mind, we are designing spectrograph have instrumental precision of 15 cm/s so that on-sky measurement (that includes modeling RV noise from star) can reach better than...
The EXtreme PREcision Spectrograph (EXPRES) is an environmentally stabilized, fiber-fed, $R=137,500$, optical spectrograph. It was recently commissioned at the 4.3-m Lowell Discovery Telescope (LDT) near Flagstaff, Arizona. spectrograph designed with a target radial-velocity (RV) precision of 30$\mathrm{~cm~s^{-1}}$. In addition to instrumental innovations, EXPRES pipeline, presented here, first for on-sky, optical, fiber-fed employ many novel techniques---including "extended flat" fiber...
The EXtreme PREcision Spectrograph (EXPRES) is a new Doppler spectrograph designed to reach radial velocity measurement precision sufficient detect Earth-like exoplanets orbiting nearby, bright stars. We report on extensive laboratory testing and on-sky observations quantitatively assess the instrumental of EXPRES, with focused discussion individual terms in instrument error budget. find that EXPRES can single-measurement calibration better than 10 cm/s, not including photon noise from...
Abstract We present an analysis of the first two XRISM/Resolve spectra well-known Seyfert-1.5 active galactic nucleus (AGN) in NGC 4151, obtained 2023 December. Our work focuses on nature narrow Fe K α emission line at 6.4 keV, strongest and most common X-ray observed AGN. The total is found to consist three components. Even narrowest component resolved with evident ,1 (6.404 keV) ,2 (6.391 contributions a 2:1 flux ratio, fully consistent neutral gas negligible bulk velocity. Subject...
view Abstract Citations (97) References (61) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Comprehensive Study of the X-Ray Structure and Spectrum IC 443 Petre, R. ; Szymkowiak, A. E. Seward, F. D. Willingale, This paper presents results a comprehensive study X-ray emission from supernova remnant 443, using solid state spectrometer, IPC, high-resolution images Einstein Observatory, medium-energy detector HEAO 1 A-2 experiment. soft appearance was...
view Abstract Citations (122) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS An X-ray study of two Crablike supernova remnants : 3C 58 and CTB 80. Becker, R. H. ; Helfand, D. J. Szymkowiak, A. E. The instruments on the Einstein Observatory have been used to properties SNRs: Images objects are similar, showing an extended plateau emission surrounding a pronounced central maximum consistent with presence point source. spectrum is power law...
We present the development status of Soft X-ray Spectrometer (SXS) onboard ASTRO-H mission. The SXS provides capability high energy-resolution spectroscopy a FWHM energy resolution < 7eV in range 0.3 – 10 keV. It utilizes an micorcalorimeter array operated at 50 mK. microcalorimeter subsystem is being developed EM-FM approach. EM cryostat was and fully tested and, although design generally confirmed, several anomalies problems were found. Among them interference detector with...
view Abstract Citations (108) References (55) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Multiwavelength Monitoring of the BL Lacertae Object PKS 2155-304. I. The IUE Campaign Urry, C. M. ; Maraschi, L. Edelson, R. Koratkar, A. Krolik, J. Madejski, G. Pian, E. Pike, Reichert, Treves, Wamsteker, W. Bohlin, Bregman, Brinkmann, Chiappetti, Courvoisier, T. Filippenko, V. Fink, H. George, Kondo, Y. Martin, P. Miller, O'Brien, Shull, Sitko, Szymkowiak,...
We present the science and an overview of Soft X-ray Spectrometer onboard <i>ASTRO-H</i> mission with emphasis on detector system. The SXS consists focusing mirrors a microcalorimeter array is developed by international collaboration lead JAXA NASA European participation. 6×6 format operated at cryogenic temperature 50 mK covers 3' ×3' field view telescope 5.6 m focal length. expect energy resolution better than 7 eV (FWHM, requirement) goal 4 eV. effective area instrument will be 225...
view Abstract Citations (89) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS HEAO 1 observations of the X-ray pulsar 4U 1626-67. Pravdo, S. H. ; White, N. E. Boldt, A. Holt, Serlemitsos, P. J. Swank, Szymkowiak, Tuohy, I. Garmire, G. Results are reported for an observation 7-s 1626-67 with A-2 experiment on 1. The phase-averaged spectrum between 0.7 and 60 keV is complex, as constituent spectra, which change radically a function pulse phase....
High-resolution X-ray spectrometers onboard suborbital sounding rockets can search for dark matter candidates that produce lines, such as decaying keV-scale sterile neutrinos. Even with exposure times and effective areas far smaller than XMM-Newton Chandra observations, high-resolution, wide field of view observations have competitive sensitivity to We analyze a subset the 2011 observation by Quantum Calorimeter instrument centered on Galactic coordinates an 106 s, obtaining limit neutrino...
Abstract We present XRISM Resolve observations of the core hot, relaxed galaxy cluster Abell 2029 (A2029). find that line-of-sight bulk velocity intracluster medium (ICM) within central 180 kpc is at rest with respect to brightest galaxy, a 3 σ upper limit ∣ v < 100 km s −1 . robustly measure field-integrated ICM dispersion be = 169 ± 10 , obtaining similar results for both single-temperature and two-temperature plasma models account cool core. This result, if ascribed isotropic...
The x-ray spectrometer (XRS) instrument is a revolutionary nondispersive that will form the basis for Astro-E2 observatory to be launched in 2005. We have recently installed flight spare XRS microcalorimeter at EBIT-I and SuperEBIT facility LLNL replacing from earlier Astro-E mission providing twice resolving power. an detector senses heat deposited by incident photon. It achieves high energy resolution operating 0.06 K carefully engineering capacity thermal conductance. XRS/EBIT has 32...
Thermal detectors for X-ray spectroscopy combining high spectral resolution and quantum efficiency have been developed. These microcalorimeters measure the energy released in absorption of a single photon by sensing rise temperature small absorbing structure. The ultimate such device is limited thermodynamic power fluctuations thermal link between calorimeter isothermal bath can principle be made as low 1 eV. performance real degraded due to noise contributions excess 1/f thermistor...
Doppler observations from Keck Observatory have revealed a triple-planet system orbiting the nearby K4V star, HIP 57274. The inner planet, 57274b, is super-Earth with Msin i = 11.6 M⊕ (0.036 MJup), an orbital period of 8.135 ± 0.004 days, and slightly eccentric orbit e 0.19 0.1. We calculate transit probability 6.5% for planet. second planet has 0.4 MJup 32.0 0.02 days in nearly circular (e 0.05 0.03). third 0.53 432 8 (1.18 years) eccentricity 0.23 0.03. This discovery adds to number mass...
The Astro-H (Hitomi) Soft X-ray Spectrometer (SXS) was a pioneering imaging x-ray spectrometer with 5 eV energy resolution at 6 keV. instrument used microcalorimeter array the focus of high-throughput soft telescope to enable high-resolution nondispersive spectroscopy in waveband (0.3 12 keV). We present suite ground calibration measurements acquired from 2012 2015, including characterization detector system, anti-coincidence detector, optical blocking filters, and filter-wheel filters....
Abstract The next generation of exoplanet-hunting spectrographs should deliver up to an order magnitude improvement in radial velocity (RV) precision over the standard 1 <?CDATA ${\rm{m}}\ {{\rm{s}}}^{-1}$?> state-of-the-art spectrographs. This advance is critical for enabling detection Earth-mass planets around Sun-like stars. New calibration techniques such as laser frequency combs and stabilized etalons ensure that instrumental stability well characterized. However, additional sources...