Eric W. Koch
A5082507738- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Spectroscopy and Laser Applications
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Space Exploration and Technology
- Radio Astronomy Observations and Technology
- Computational Physics and Python Applications
- Atomic and Molecular Physics
- Pharmacological Effects and Assays
- Spectroscopy and Chemometric Analyses
- Phase Equilibria and Thermodynamics
- Image and Signal Denoising Methods
- Scientific Research and Discoveries
- Fullerene Chemistry and Applications
- Water Quality Monitoring and Analysis
- Neural Networks and Applications
- Material Science and Thermodynamics
Center for Astrophysics Harvard & Smithsonian
2021-2024
University of Alberta
2015-2024
Grand Valley State University
2020
Friedrich-Alexander-Universität Erlangen-Nürnberg
2018
Okanagan University College
2014-2017
University of British Columbia
2015-2017
University at Albany, State University of New York
2010
Stony Brook University
1996
Health Sciences and Nutrition
1955
Milliken & Company (United States)
1955
Abstract The Astropy Project supports and fosters the development of open-source openly developed Python packages that provide commonly needed functionality to astronomical community. A key element is core package astropy , which serves as foundation for more specialized projects packages. In this article, we summarize features in recent major release, version 5.0, updates on Project. We then discuss supporting a broader ecosystem interoperable packages, including connections with several...
Abstract We present PHANGS–ALMA, the first survey to map CO J = 2 → 1 line emission at ∼1″ ∼100 pc spatial resolution from a representative sample of 90 nearby ( d ≲ 20 Mpc) galaxies that lie on or near z 0 “main sequence” star-forming galaxies. traces bulk distribution molecular gas, which is cold, phase interstellar medium. At achieved by each beam reaches size typical individual giant cloud, so these data can be used measure demographics, life cycle, and physical state clouds across...
We present a new algorithm for detecting filamentary structure FilFinder. The uses the techniques of mathematical morphology filament identification, presenting complementary approach to current algorithms which use matched filtering or critical manifolds. Unlike other methods, FilFinder identifies filaments over wide dynamic range in brightness. apply far-infrared imaging data dust emission released by Herschel Gould Belt Survey team. Our preliminary analysis characterizes both and fainter...
We present the PHANGS-MUSE survey, a programme that uses MUSE integral field spectrograph at ESO VLT to map 19 massive (9.4 < log( M ⋆ / ⊙ )< 11.0) nearby ( D ≲ 20 Mpc) star-forming disc galaxies. The survey consists of 168 pointings (1′ by 1′ each) and total nearly 15 × 10 6 spectra, covering ∼1.5 independent spectra. provides first view star formation across different local environments (including galaxy centres, bars, spiral arms) in external galaxies median resolution 50 pc, better...
Abstract The PHANGS program is building the first data set to enable multiphase, multiscale study of star formation across nearby spiral galaxy population. This effort enabled by large survey programs with Atacama Large Millimeter/submillimeter Array (ALMA), MUSE on Very Telescope, and Hubble Space Telescope (HST), which we have obtained CO(2–1) imaging, optical spectroscopic mapping, high-resolution UV–optical respectively. Here, present PHANGS-HST, has NUV– U – B V I imaging disks 38...
We measure the low-J CO line ratio R21=CO(2-1)/CO(1-0), R32=CO(3-2)/CO(2-1), and R31 = CO(3-2)/CO(1-0) using whole-disk maps of nearby galaxies. draw CO(2-1) from PHANGS--ALMA, HERACLES, follow-up IRAM surveys; CO(1-0) COMING Nobeyama Atlas Nearby Spiral Galaxies; CO(3-2) JCMT NGLS APEX LASMA mapping. Altogether this yields 76, 47, 29 R21, R32, at 20" \sim 1.3 kpc resolution, covering 43, 34, 20 Disk galaxies with high stellar mass, log10 M_* [Msun]=10.25-11 star formation rate, SFR=1-5...
The PHANGS collaboration has been building a reference dataset for the multi-scale, multi-phase study of star formation and interstellar medium in nearby galaxies. With successful launch commissioning JWST, we can now obtain high-resolution infrared imaging to probe youngest stellar populations dust emission on scales clusters molecular clouds ($\sim$5-50 pc). In Cycle 1, is conducting an 8-band survey from 2-21$\mu$m 19 spiral CO(2-1) mapping, optical integral field spectroscopy, UV-optical...
We measure empirical relationships between the local star formation rate (SFR) and properties of star-forming molecular gas on 1.5 kpc scales across 80 nearby galaxies. These relationships, commonly referred to as "star laws," aim at predicting SFR surface density from various combinations density, galactic orbital time, cloud free-fall interstellar medium dynamical equilibrium pressure. Leveraging a multiwavelength database built for PHANGS survey, we these quantities consistently all...
Aims. The complexity of star formation at the physical scale molecular clouds is not yet fully understood. We investigate mechanisms regulating stars in different environments within nearby star-forming galaxies from Physics High Angular resolution Nearby GalaxieS (PHANGS) sample. Methods. Integral field spectroscopic data and radio-interferometric observations 18 were combined to explore existence resolved main sequence (Σ stellar versus Σ SFR ), Kennicutt–Schmidt relation mol. gas we...
We present a rich, multiwavelength, multiscale database built around the PHANGS-ALMA CO$\,$(2-1) survey and ancillary data. use this to distributions of molecular cloud populations sub-galactic environments in 80 PHANGS galaxies, characterize relationship between population-averaged properties host galaxy properties, assess key timescales relevant evolution star formation. show that probes wide range kpc-scale gas, stellar, formation rate (SFR) surface densities, as well orbital velocities...
The first JWST observations of nearby galaxies have unveiled a rich population bubbles that trace the stellar feedback mechanisms responsible for their creation. Studying these therefore allows us to chart interaction between and interstellar medium, larger galactic flows needed regulate star formation processes globally. We present catalog in NGC628, visually identified using MIRI F770W PHANGS-JWST observations, use them statistically evaluate bubble characteristics. classify 1694...
Abstract We compare mid-infrared (mid-IR), extinction-corrected H α , and CO (2–1) emission at 70–160 pc resolution in the first four PHANGS–JWST targets. report correlation strengths, intensity ratios, power-law fits relating JWST’s F770W, F1000W, F1130W, F2100W bands to . At these scales, each correlate strongly with mid-IR emission, correlations are stronger than one emission. This reflects that simultaneously acts as a dust column density tracer, leading good match molecular-gas-tracing...
We present a high-resolution view of bubbles within The Phantom Galaxy (NGC 628); nearby (~10Mpc), star-forming (~2Msun/yr), face-on (i~9deg) grand-design spiral galaxy. With new data obtained as part the PHANGS-JWST treasury program, we perform detailed case-study two regions interest, one which contains largest and most prominent bubble in galaxy (The Void; over 1kpc diameter), other being smaller region that may be precursor to such large Precursor Void). When comparing matched resolution...
JWST observations of polycyclic aromatic hydrocarbon (PAH) emission provide some the deepest and highest resolution views cold interstellar medium (ISM) in nearby galaxies. If PAHs are well mixed with atomic molecular gas illuminated by average diffuse radiation field, PAH may an approximately linear, high resolution, sensitivity tracer surface density. We present a pilot study that explores using this way based on MIRI IC 5332, NGC 628, 1365, 7496 from PHANGS-JWST Treasury. Using scaling...
Abstract PHANGS–JWST mid-infrared (MIR) imaging of nearby spiral galaxies has revealed ubiquitous filaments dust emission in intricate detail. We present a pilot study to systematically map the filament network (DFN) at multiple scales between 25 and 400 pc NGC 628. MIRI images 7.7, 10, 11.3, 21 μ m 628 are used generate maps emission, while PHANGS–HST B -band yields attenuation features. quantify correspondence traced by MIR thermal continuum/polycyclic aromatic hydrocarbon (PAH) detected...
Abstract We measure the CO-to-H 2 conversion factor ( α CO ) in 37 galaxies at kpc resolution, using dust surface density inferred from far-infrared emission as a tracer of gas and assuming constant dust-to-metal ratio. In total, we have ∼790 ∼610 independent measurements for (2–1) (1–0), respectively. The mean values (1–0) are <?CDATA ${9.3}_{-5.4}^{+4.6}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>9.3</mml:mn> </mml:mrow>...
Abstract The exquisite angular resolution and sensitivity of JWST are opening a new window for our understanding the Universe. In nearby galaxies, observations revolutionizing first phases star formation dusty interstellar medium. Nineteen local galaxies spanning range properties morphologies across star-forming main sequence have been observed as part PHANGS-JWST Cycle 1 Treasury program at spatial scales ∼5–50 pc. Here, we describe pjpipe , an image-processing pipeline developed that wraps...
We present panchromatic resolved stellar photometry for 22 million stars in the Local Group dwarf spiral Triangulum (M33), derived from Hubble Space Telescope (HST) observations with Advanced Camera Surveys (ACS) optical (F475W, F814W), and Wide Field 3 (WFC3) near ultraviolet (F275W, F336W) near-infrared (F110W, F160W) bands. The large, contiguous survey area covers $\sim$14 square kpc extends to 3.5 (14 arcmin, or 1.5-2 scale lengths) center of M33. PHATTER observing strategy technique...
Abstract JWST/Mid-Infrared Instrument imaging of the nearby galaxies IC 5332, NGC 628, 1365, and 7496 from PHANGS reveals a richness gas structures that in each case form quasi-regular network interconnected filaments, shells, voids. We examine whether this multiscale structure is consistent with fragmentation disk through gravitational instability. use FilFinder to detect web filamentary features galaxy determine their characteristic radial azimuthal spacings. These spacings are then...
Abstract We explore the relationship between mid-infrared (mid-IR) and CO rotational line emission from massive star-forming galaxies, which is one of tightest scalings in local universe. assemble a large set unresolved moderately (∼1 kpc) spatially resolved measurements (1–0) (2–1) intensity, I , mid-IR MIR at 8, 12, 22, 24 μ m. The versus reasonably described by power law with slopes 0.7–1.2 normalization ∼ 1 K km s −1 MJy sr . Both intercepts vary systematically choice band. comparison...
Abstract We use 0.1″ observations from the Atacama Large Millimeter Array (ALMA), Hubble Space Telescope (HST), and JWST to study young massive clusters (YMCs) in their embedded “infant” phase across central starburst ring NGC 3351. Our new ALMA data reveal 18 bright compact (sub-)millimeter continuum sources, of which 8 have counterparts images only 6 HST images. Based on molecular line data, as well ancillary measurements for counterparts, we identify 14 sources infant star with high...
Abstract Polycyclic aromatic hydrocarbons (PAHs) are a ubiquitous component of the interstellar medium (ISM) in z ∼ 0 massive, star-forming galaxies and play key roles ISM energy balance, chemistry, shielding. Wide field-of-view, high-resolution mid-infrared (MIR) images from JWST provide ability to map fraction dust form PAHs properties these grains at 10–50 pc resolution outside Local Group. We use MIR photometric observations sample 19 nearby Physics High Angular Resolution Nearby...
Abstract The PHANGS survey uses Atacama Large Millimeter/submillimeter Array, Hubble Space Telescope, Very and JWST to obtain an unprecedented high-resolution view of nearby galaxies, covering millions spatially independent regions. high dimensionality such a diverse multiwavelength data set makes it challenging identify new trends, particularly when they connect observables from different wavelengths. Here, we use unsupervised machine-learning algorithms mine this information-rich novel...
ABSTRACT We have developed an iterative procedure to systematically combine the millimeter and submillimeter images of OB cluster-forming molecular clouds, which were taken by ground-based (CSO, JCMT, APEX, IRAM-30 m) space telescopes ( Herschel Planck ). For seven luminous <?CDATA $L\gt {10}^{6}$?> L ⊙ ) Galactic clouds selected for our analyses, namely W49A, W43-Main, W43-South, W33, G10.6-0.4, G10.2-0.3, G10.3-0.1, we performed single-component, modified blackbody fits each pixel combined...