A5044832222- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Computational Physics and Python Applications
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- History and Developments in Astronomy
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- High-Energy Particle Collisions Research
- Pulsars and Gravitational Waves Research
- Fault Detection and Control Systems
- Software Engineering and Design Patterns
- Radiology practices and education
- Career Development and Diversity
- Nuclear Physics and Applications
- Evaluation of Teaching Practices
- Mental Health via Writing
Binghamton University
2024
Washington and Jefferson College
2017-2021
Union College
2015-2017
Cornell University
2009-2015
We present a current catalog of 21 cm HI line sources extracted from the Arecibo Legacy Fast L-band Feed Array (ALFALFA) survey over ~2800 square degrees sky: alpha.40 catalog. Covering 40% final area, contains 15855 in regions 07h30m < R.A. 16h30m, +04 deg Dec. +16 and +24 +28 22h 03h, +14 +32 deg. Of those, 15041 are certainly extragalactic, yielding source density 5.3 galaxies per degree, factor 29 improvement Parkes All Sky Survey. In addition to centroid positions, flux densities,...
We present the catalog of ~31500 extragalactic HI line sources detected by completed ALFALFA survey out to z < 0.06 including both high signal-to-noise ratio (> 6.5) detections and ones lower quality which coincide in position recessional velocity with galaxies known redshift. review observing technique, data reduction pipeline, construction process, focusing on details particular relevance understanding catalog's compiled parameters. further describe make available digital spectra...
Abstract We present a sample of 115 very low optical surface brightness, highly extended, H i -rich galaxies carefully selected from the ALFALFA survey that have similar absolute magnitudes, brightnesses, and radii to recently discovered “ultra-diffuse” (UDGs). However, these systems are bluer more irregular morphologies than other UDGs, isolated, contain significant reservoirs . find while sources normal star formation rates for -selected stellar mass, they efficiencies. further deep...
We present VLA HI spectral line imaging of 5 sources discovered by ALFALFA. These targets are drawn from a larger sample systems that were not uniquely identified with optical counterparts during ALFALFA processing, and as such have unusually high mass to light ratios. candidate "Almost Dark" objects fall into 4 categories: 1) nearby neighbors likely tidal origin; 2) appear be part system multiple sources, but which may in 3) isolated detections, located near gas-poor early-type galaxy; 4)...
Abstract We use the ALFALFA H i survey to examine whether cold gas reservoirs of galaxies are inhibited or enhanced in large-scale filaments. Our sample includes 9947 late-type with detections and 4236 well-determined detection limits that we incorporate using survival analysis statistics. find that, even at fixed local density stellar mass, group removed, deficiency mass range 8.5 < log( M / ⊙ ) 10.5 decreases distance from filament spine, suggesting cut off their supply this...
We present first results of the study a set exceptional HI sources identified in 40% ALFALFA extragalactic survey catalog alpha.40 as being both massive (M_HI > 10^10 Msun) and having high gas fractions for their stellar masses: HIghMass galaxy sample. analyze UV- optical-broadband Halpha images to understand nature relatively underluminous disks optical test whether can be tracked higher dark matter halo spin parameters or late accretion. Estimates star formation rates (SFRs) based on...
We present the HI content of galaxies in nearby groups and clusters as measured by 70% complete Arecibo Legacy Fast-ALFA (ALFALFA) survey, including constraints from ALFALFA detection limits. Our sample includes 22 systems at distances between 70-160 Mpc over mass range 12.5<log M/M_sun<15.0, for a total 1986 late-type galaxies. find that centers lack fixed stellar relative to regions surrounding them. Larger show evidence stronger dependence properties on environment, despite similar color...
We investigate the dwarf (MB > −16) galaxies in Virgo cluster radio, optical, and ultraviolet regimes. Of 365 this sample, 80 have been detected H i by Arecibo Legacy Fast ALFA survey. These detections include 12 early-type dwarfs (ETDs) that stellar masses similar to irregulars blue compact dwarfs. In sample of 12, half star formation properties late-type dwarfs, while other are quiescent-like typical ETDs. also discuss three possible mechanisms for their evolution: they infalling field or...
We present resolved HI observations of two galaxies, UGC 9037 and 12506, members a rare subset galaxies detected by the ALFALFA extragalactic survey characterized high mass gas fraction for their stellar masses. Both these have M$_*>10^{10}$ M$_\odot$ M$_\text{HI}>$ M$_*$, as well typical star formation rates How can such avoided consuming massive reservoirs? From kinematics, stability, formation, dark matter distributions we infer radically different histories. has central surface density...
We present new high-resolution HI spectral line imaging of Coma P, the brightest source in system 1232$+$20. This extremely low surface brightness galaxy was first identified ALFALFA survey as an "(Almost) Dark" object: a clearly extragalactic with no obvious optical counterpart existing data (although faint ultraviolet emission detected archival GALEX imaging). Using combination from Westerbork Synthesis Radio Telescope and Karl G. Jansky Very Large Array, we investigate morphology...
We present resolved HI and CO observations of three galaxies from the HIghMass sample, a sample HI-massive ($M_{HI} > 10^{10} M_\odot$), gas-rich ($M_{HI}$ in top $5\%$ for their $M_*$) identified ALFALFA survey. Despite high gas fractions, these are not low surface brightness galaxies, have typical specific star formation rates (SFR$/M_*$) stellar masses. The normal masses, but unusually short efficiency scale lengths, indicating that bottleneck is conversion to H$_2$, converting H$_2$...
We investigate the potential of compact muon solenoid detector at CERN Large Hadron Collider (LHC) to discriminate between two theoretical models predicting anomalous events with jets and large missing transverse energy, minimal supersymmetry, little Higgs $T$ parity. focus on a simple test-case scenario, in which only exotic particles produced LHC are heavy color-triplet states (squarks or quarks), open decay channel for these is into stable missing-energy particle (neutralino photon) plus...
We investigate a sample of 3 dwarf elliptical galaxies in the Virgo Cluster which have significant reservoirs HI. present deep optical imaging (from CFHT and KPNO), HI spectra (Arecibo) resolved (VLA) this sample. These observations confirm their content morphologies, indicate that gas is unlikely to be recently accreted. The has more common with transitionals, although transitionals are generally lower stellar mass fraction. VCC 190 an tidal tail from recent encounter massive spiral galaxy...
We present H-alpha velocity maps for the HIghMass galaxies UGC 7899, 8475, 9037 and 9334, obtained with SITELLE Imaging Fourier Transform Spectrometer on Canada-France-Hawaii Telescope, to search kinematic signatures of late gas accretion explain their large atomic reservoirs. The 9037, 9334 are amenable disk wide radial flow searches DiskFit algorithm, those 7899 also inner-disk analyses. find no evidence outer flows down Vr ~ 20 km/s in but hints such 7899. Conversely, we clear inner (r 5...
We report a multi-objective campaign of targeted 21 cm H i line observations sources selected from the Arecibo Legacy Fast L-band Feed Array (ALFALFA) survey and galaxies identified by their morphological photometric properties in Sloan Digital Sky Survey. The aims this program have been (1) to confirm reality some ALFALFA whose enigmatic nature suggest additional multiwavelength observations; (2) probe low signal-to-noise ratio (S/N) regime, below reliability limit; (3) explore feasibility...
Political polarization, fueled by conflicting meta-perceptions, presents a critical obstacle to constructive discourse and collaboration. These meta-perceptions-how one group perceives another group's views of them-are often inaccurate can lead detrimental outcomes such as increased hostility dehumanization. Across two studies, we introduce experimentally test novel approach that exposes participants atypical, counter-stereotypical members an opposing who either confirm or disrupt their...
The NSF-sponsored Undergraduate ALFALFA Team (UAT) promotes long-term collaborative research opportunities for faculty and students from 23 U.S. public private primarily undergraduate institutions (PUIs) within the context of extragalactic HI blind legacy survey project. Over twelve project years partnering with Arecibo Green Bank Observatories, UAT has had a demonstrable impact on health astronomy project, science education, equity/inclusion in astronomy, successful outcomes 373 (39% women;...