A5029847578- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
University of Massachusetts Amherst
2019-2025
Abstract We investigate the emergence phase of young star clusters in nearby spiral galaxy NGC 628. use JWST NIRCam and MIRI observations to create spatially resolved maps Pa α 1.87 μ m Br 4.05 hydrogen recombination lines, as well 3.3 7.7 emission from polycyclic aromatic hydrocarbons (PAHs). extract 953 compact H ii regions analyze PAH morphology at ∼10 pc scales associated photodissociation regions. While remain compact, radial profiles help us define three morphological classes: (∼42%),...
Abstract We present maps of ionized gas (traced by Pa α and Br ) 3.3 μ m polycyclic aromatic hydrocarbon (PAH) emission in the nearby spiral galaxy NGC 628, derived from new JWST/NIRCam data Feedback Emerging extrAgalactic Star clusTers (FEAST) survey. With this data, we investigate calibrate relation between PAH star formation rate (SFR) around emerging young clusters (eYSCs) on a scale ∼40 pc. find tight (correlation coefficient ρ ∼ 0.9) sublinear (power-law exponent 0.75) luminosity...
JWST/MIRI images have been used to study the Fourier transform power spectra (PS) of two spiral galaxies, NGC 628 and 5236, dwarfs, 4449 5068, at distances ranging from 4 10 Mpc. The PS slopes on scales larger than 200 pc range <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>−</mml:mo><mml:mn>0.6</mml:mn></mml:mrow></mml:math> display="inline"><mml:mrow><mml:mn>21</mml:mn><mml:mi>μ</mml:mi></mml:mrow></mml:math>m...
ABSTRACT The rate of fast radio bursts (FRBs) in the direction nearby galaxy clusters is expected to be higher than mean cosmological if intrinsically faint FRBs are numerous. In this paper, we describe a targeted search for near core Virgo Cluster using Australian Square Kilometre Array Pathfinder telescope. During 300 h observations, discovered one burst, FRB 180417, with dispersion measure (DM) = 474.8 cm−3 pc. was promptly followed up by several telescopes 27 h, but no repeat were...
Abstract We present the average gas properties derived from Atacama Large Millimeter Array (ALMA) Band 6 dust continuum imaging of 126 massive (log M ⋆ / ⊙ ≳ 10.5), star-forming cluster galaxies across 11 galaxy clusters at z = 1–1.75. Using stacking analysis on ALMA images, combined with UV–far-infrared data, we quantify infrared spectral energy distributions (SEDs) and (molecular masses, mol ;gas depletion timescales, τ depl ; fractions, f ) as functions cluster-centric radius including...
We present an extensive archival analysis of a sample local galaxies, combining multi-wavelength data from GALEX, Spitzer and Herschel to investigate "blue-side" mid-infrared (MIR) "red-side" far-infrared (FIR) color-color correlations within the observed infrared spectral energy distributions (IR SEDs). Our largely consists KINGFISH with important addition select few including NGC5236 (M83) NGC4449. With far-ultraviolet FUV (${\sim}0.15$ $\mu$m) through 500 $\mu$m convolved common angular...
Abstract Observations of 12 CO J = 1 – 0 and HCN emission from NGC 5194 (M51) made with the 50 m Large Millimeter Telescope SEQUOIA focal plane array are presented. Using HCN-to-CO ratio, we examine dense gas mass fraction over a range environmental conditions within galaxy. Within disk, varies along spiral arms but average value all is comparable to mean interarm regions. We suggest that near-constant throughout disk arises population density-stratified, self-gravitating molecular clouds...
Abstract New JWST near-infrared imaging of the nearby galaxy NGC 628 from Cycle 1 program Feedback in Emerging extrAgalactic Star clusTers (JWST-FEAST) is combined with archival mid-infrared to calibrate 21 μ m emission as a star formation rate (SFR) indicator at ∼120 pc scales. The Pa α (1.8756 m) hydrogen recombination line targeted by FEAST provides reference SFR that relatively insensitive dust attenuation, demonstrated combining this tracer Hubble Space Telescope H imaging. Our analysis...
We present maps of ionized gas (traced by Pa$\alpha$ and Br$\alpha$) 3.3 $\mu$m Polycyclic Aromatic Hydrocarbon (PAH) emission in the nearby spiral galaxy NGC 628, derived from new JWST/NIRCam data FEAST survey. With this data, we investigate calibrate relation between PAH star formation rate (SFR) around emerging young clusters (eYSCs) on a scale ${\sim}40$ pc. find tight (correlation coefficient $\rho$${\sim}$0.9) sub-linear (power-law exponent $\alpha$${\sim}$0.75) luminosity surface...
We investigate the emergence phase of young star clusters in nearby spiral galaxy NGC 628. use JWST NIRCam and MIRI observations to create spatially resolved maps Pa$\alpha$-1.87 $\mu$m Br$\alpha$-4.05 hydrogen recombination lines, as well 3.3 7.7 emission from polycyclic aromatic hydrocarbons (PAHs). extract 953 compact HII regions analyze PAH morphology at ~10 pc scales associated photo-dissociation (PDRs). While remain compact, radial profiles help us define three morphological classes:...
New JWST near-infrared imaging of the nearby galaxy NGC 628 from Cycle 1 program JWST-FEAST is combined with archival mid-infrared to calibrate 21 $\mu$m emission as a star formation rate indicator (SFR) at $\sim$120 pc scales. The Pa$\alpha$ ($\lambda$1.8756 $\mu$m) hydrogen recombination line targeted by FEAST provides reference SFR that relatively insensitive dust attenuation, demonstrated combining this tracer HST H$\alpha$ imaging. Our analysis restricted regions appear compact in...
JWST/MIRI images have been used to study the Fourier transform power spectra (PS) of two spiral galaxies, NGC 628 and 5236, dwarfs, 4449 5068, at distances ranging from 4 10 Mpc. The PS slopes on scales larger than 200 pc range -0.6 21 microns -1.2 5.6 microns, suggesting a scaling region luminosity with size as law index 2.6 3.2, respectively. This result is consistent size-luminosity relation star-forming regions found elsewhere, but extending here scales. There no evidence for kink or...
Abstract We present the average gas properties derived from Atacama Large Millimeter Array (ALMA) Band 6 dust continuum imaging of 126 massive (log M ⋆ / ⊙ ≳ 10.5), star-forming cluster galaxies across 11 galaxy clusters at z = 1–1.75. Using stacking analysis on ALMA images, combined with UV–far-infrared data, we quantify infrared spectral energy distributions (SEDs) and (molecular masses, mol ;gas depletion timescales, τ depl ; fractions, f ) as functions cluster-centric radius including...