Peter Kurczynski
A5002610832- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Advanced Semiconductor Detectors and Materials
- History and Developments in Astronomy
- Photocathodes and Microchannel Plates
- Radiation Detection and Scintillator Technologies
- Optical Wireless Communication Technologies
- Scientific Research and Discoveries
- Photonic and Optical Devices
- CCD and CMOS Imaging Sensors
- Advanced X-ray and CT Imaging
- Geophysics and Gravity Measurements
- Radio Astronomy Observations and Technology
- Relativity and Gravitational Theory
- Nuclear Physics and Applications
- Advanced Vision and Imaging
- Advanced Frequency and Time Standards
- Particle Accelerators and Free-Electron Lasers
Goddard Space Flight Center
1996-2024
Deleted Institution
2023-2024
Center for Astrophysics Harvard & Smithsonian
2024
Rutgers, The State University of New Jersey
2011-2020
U.S. National Science Foundation
2018
Yale University
2009-2010
University of California, Berkeley
2001-2006
Alcatel Lucent (Germany)
2006
Nagoya University
1998
University of Maryland, College Park
1996-1997
We present a sensitive 870 micron survey of the Extended Chandra Deep Field South (ECDFS) using LABOCA on APEX telescope. The ECDFS Submillimetre Survey (LESS) covers full 30' x field size and has uniform noise level 1.2 mJy/beam. LESS is thus largest contiguous deep submillimetre undertaken to date. properties our map show clear evidence that we are beginning be affected by confusion noise. catalog 126 SMGs detected with significance above 3.7 sigma. exhibits deficit bright relative...
We present the public release of stellar mass catalogs for GOODS-S and UDS fields obtained using some deepest near-IR images available, achieved as part Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey project. combine effort from 10 different teams, who computed masses same photometry redshifts. Each team adopted their preferred fitting code, assumptions, priors, parameter grid. The combination results underlying isochrones reduces systematics associated with code other...
We report the discovery of a candidate galaxy with photo-z z~12 in first epoch JWST Cosmic Evolution Early Release Science (CEERS) Survey. Following conservative selection criteria we identify source robust z_phot = 11.8^+0.3_-0.2 (1-sigma uncertainty) m_F200W=27.3, and >7-sigma detections five filters. The is not detected at lambda < 1.4um deep imaging from both HST JWST, has faint ~3-sigma F150W F160W, which signal Ly-alpha break near red edge filters, implying z~12. This object (Maisie's...
We present photometry and derived redshifts from up to eleven bandpasses for 9927 galaxies in the Hubble Ultra Deep field (UDF), covering an observed wavelength range near-ultraviolet (NUV) near-infrared (NIR) with Space Telescope observations. Our Wide Field Camera 3 (WFC3)/UV F225W, F275W, F336W image mosaics ultra-violet UDF (UVUDF) imaging campaign are newly calibrated correct charge transfer inefficiency, use new dark calibrations minimize background gradients pattern noise. NIR WFC3/IR...
Lyman Break Galaxy (LBG) candidates at z>10 are rapidly being identified in JWST/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-frame UV photons, these sources expected drop out bluer filters while well detected redder filters. However, here we show that dust-enshrouded star-forming galaxies lower redshifts (z<7) may also mimic near-infrared (near-IR) colors LBGs, representing potential contaminants LBG candidate samples. First, analyze...
We present the Black Hole Explorer (BHEX), a mission that will produce sharpest images in history of astronomy by extending submillimeter Very-Long-Baseline Interferometry (VLBI) to space. BHEX discover and measure bright narrow "photon ring" is predicted exist black holes, produced from light has orbited hole before escaping. This discovery expose universal features hole's spacetime are distinct complex astrophysics emitting plasma, allowing first direct measurements supermassive spin. In...
We study the co-existence of star formation and active galactic nucleus (AGN) activity in Chandra X-ray-selected AGN by analyzing stacked 870 μm submillimeter emission from a deep wide map Extended Deep Field South (ECDFS), obtained with LABOCA instrument at APEX telescope. The total X-ray sample 895 sources median redshift z ∼ 1 drawn combined (E)CDFS catalogs is detected >11σ significance mean flux 0.49 ± 0.04 mJy, corresponding to typical rate (SFR) around 30 M☉ yr−1 for T = 35 K, β 1.5...
We analyze the star-forming and structural properties of 45 massive (log(M/Msun)>10) compact galaxies (SFGs) at 2<z<3 to explore whether they are progenitors quiescent z~2. The optical/NIR far-IR Spitzer/Herschel colors indicate that most SFGs heavily obscured. Nearly half (47%) host an X-ray bright AGN. In contrast, only about 10% other time AGNs. Compact have centrally-concentrated light profiles spheroidal morphologies similar galaxies, thus strikingly different from SFGs. Most lie either...
The Large Synoptic Survey Telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of our Solar System, Galaxy and Universe, across half the sky over ten years repeated observation. However, exactly how LSST observations be taken (the observing strategy or "cadence") not yet finalized. In this dynamically-evolving community white paper, we explore detailed performance anticipated science expected depend on small changes strategy. Using...
We report on the host properties of five X-ray luminous Active Galactic Nuclei (AGN) identified at $3 < z 5$ in first epoch imaging from Cosmic Evolution Early Release Science Survey (CEERS). Each galaxy has been imaged with \textit{James Webb Space Telescope} (\jwst) Near-Infrared Camera (NIRCam), which provides spatially resolved, rest-frame optical morphologies these redshifts. also derive stellar masses and star formation rates for each by fitting its spectral energy distribution using a...
Abstract We use James Webb Space Telescope Near-Infrared Camera Wide Field Slitless Spectroscopy (NIRCam WFSS) and the spectrograph (NIRSpec) in Cosmic Evolution Early Release survey to measure rest-frame optical emission-line ratios of 155 galaxies at z > 2. The blind NIRCam grism observations include a sample with bright emission lines that were not observed on NIRSpec masks. study changes H α , [O III ]/H β [Ne ]/[O II ] terms redshift by comparing lower-redshift SDSS, CLEAR, MOSDEF...
Dry, noncohesive granular materials were very slowly driven to the threshold of instability where they produced avalanches. We have used digital image analysis record avalanches that occurred on surface incline. Results show large slides every 10--13 min which reset from maximum angle stability, ${\mathrm{\ensuremath{\theta}}}_{\mathit{c}}$, back repose, ${\mathrm{\ensuremath{\theta}}}_{\mathit{r}}$. also find a power-law distribution sizes for smaller occurring between sliding events. The...
We study the physical properties of 216 z ≃ 2.1 Lyα-emitting galaxies (LAEs) discovered in an ultra-deep narrow- MUSYC image ECDF-S. fit their stacked spectral energy distribution (SED) using Charlot & Bruzual templates. consider star formation histories (SFHs) parameterized by e-folding time parameter τ, allowing for exponentially decreasing (τ > 0), increasing < and constant rates (SFRs). estimated average flux at 5015 Å our LAE sample, finding a non-detection, which translates into...
Galaxies with stellar masses near M* contain the majority of mass in universe, and are therefore special interest study galaxy evolution. The Milky Way (MW) Andromeda (M31) have present day M*, at 5x10^10 Msol (MW-mass) 10^11 (M31-mass). We typical progenitors these galaxies using ZFOURGE, a deep medium-band near-IR imaging survey, which is sensitive to out z~3. use abundance-matching techniques identify main higher redshifts. measure evolution mass, rest-frame colors, morphologies, far-IR...
We present the first set of maps and band-merged catalog from Herschel Stripe 82 Survey (HerS). Observations at 250, 350, 500 μm were taken with Spectral Photometric Imaging Receiver instrument aboard Space Observatory. HerS covers 79 deg2 along SDSS to an average depth 13.0, 12.9, 14.8 mJy beam−1 (including confusion) μm, respectively. was designed measure correlations external tracers dark matter density field—either point-like (i.e., galaxies selected radio X-ray) or extended clusters...
ABSTRACT Dust attenuation affects nearly all observational aspects of galaxy evolution, yet very little is known about the form dust-attenuation law in distant universe. Here, we model spectral energy distributions galaxies at z ∼ 1.5–3 from CANDELS with rest-frame UV to near-IR imaging under different assumptions dust law, and compare amount inferred attenuated light observed infrared (IR) luminosities. Some individual show strong Bayesian evidence preference one over another, this agrees...
We present estimates of intrinsic scatter in the Star Formation Rate (SFR) - Stellar Mass (M*) correlation redshift range 0.5 < z 3.0 and mass 10^7 M* 10^11 Msun. utilize photometry Hubble Ultradeep Field (HUDF12), Ultraviolet Ultra Deep (UVUDF) campaigns CANDELS/GOODS-S. estimate SFR, from broadband Spectral Energy Distributions (SEDs) best available redshifts. The maximum depth HUDF (F160W 29.9 AB, 5 sigma depth) probes SFR-M* down to ~ 10 ^7 Msun, a factor 10-100X lower than previous...
Abstract Identifying merging galaxies is an important—but difficult—step in galaxy evolution studies. We present random forest (RF) classifications of mergers from simulated JWST images based on various standard morphological parameters. describe (a) constructing the IllustrisTNG and Santa Cruz SAM modifying them to mimic future CEERS observations nearly noiseless observations, (b) measuring parameters these images, (c) training RFs using merger history information for available...
We present the mid-IR (MIR) morphologies for 64 star-forming galaxies at $0.2<z<2.5$ with stellar mass $\rm{M_*>10^{9}~M_\odot}$ using JWST MIRI observations from Cosmic Evolution Early Release Science survey (CEERS). The bands span MIR (7.7--21~$\mu$m), enabling us to measure effective radii ($R_{\rm{eff}}$) and S\'{e}rsic indexes of these SFGs rest-frame 6.2 7.7 $\mu$m, which contains strong emission Polycyclic aromatic hydrocarbon (PAH) features, a well-established tracer star formation...
Abstract UVCANDELS is a Hubble Space Telescope Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W in four CANDELS fields—GOODS-N, GOODS-S, EGS, COSMOS—covering total area ∼426 arcmin 2 . This ∼2.7 times larger than the covered by previous deep-field space UV data combined, reaching depth about 27 28 ABmag (5 σ 0.”2 apertures) for F435W, respectively. Along with new photometric catalogs, we present an analysis...
We present the results of a study investigating rest-frame ultra-violet (UV) spectral slopes redshift z~5 Lyman-break galaxies (LBGs). By combining deep Hubble Space Telescope imaging CANDELS and HUDF fields with ground-based from UKIDSS Ultra Deep Survey (UDS), we have produced large sample LBGs spanning an unprecedented factor >100 in UV luminosity. Based on this find clear colour-magnitude relation (CMR) at z~5, such that (beta) brighter are notably redder than their fainter counterparts....
We have exploited the Hubble Space Telescope (HST) Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS) J and H-band Wide Field Camera 3 (WFC3)/infrared (IR) imaging to study properties of (sub-)millimetre galaxies within Great Observatories Origins South (GOODS-South) field. After using deep radio (Very Large Array 1.4 GHz) Spitzer (Infrared 8 μm) identify galaxy counterparts for sources, we then utilized new CANDELS WFC3/IR in two ways. First, addition near-IR photometry from...
Abstract The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey provided ultraviolet F275W imaging with coordinated parallel optical F435W in four five CANDELS fields: GOODS-N, GOODS-S, EGS, and COSMOS, covering a total area ∼426 arcmin 2 . UVCANDELS takes primary WFC3/UVIS exposures at uniform 3-orbit depth ACS (in parallel) slightly varying due to roll angle constraints overlap from increased field view camera, reaching...
The Black Hole Explorer (BHEX) mission will enable the study of fine photon ring structure, aiming to reveal clear universal signatures multiple orbits and true tests general relativity, while also giving astronomers access a much greater population black hole shadows. Spacecraft can sample interferometric Fourier spacings that are inaccessible from ground, providing unparalleled angular resolution for most detailed spatial studies accretion better time resolution. BHEX concept provides...
We present the Cosmic Evolution Early Release Science (CEERS) Survey, a 77.2 hour Director's Discretionary Program. CEERS demonstrates, tests, and validates efficient extragalactic surveys using coordinated, overlapping parallel observations with JWST instrument suite, including NIRCam MIRI imaging, NIRSpec low (R~100) medium (R~1000) resolution spectroscopy, slitless grism (R~1500) spectroscopy. targets Hubble Space Telescope-observed region of Extended Groth Strip (EGS) field, supported by...