A5048668723- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Quantum Chromodynamics and Particle Interactions
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Career Development and Diversity
- Diverse Educational Innovations Studies
- Geophysics and Gravity Measurements
- Educational Systems and Policies
- Radiology practices and education
- Healthcare Education and Workforce Issues
- Astrophysical Phenomena and Observations
- Atomic and Subatomic Physics Research
- Science Education and Pedagogy
- Neonatal Health and Biochemistry
- Evaluation of Teaching Practices
- Superconducting Materials and Applications
Skidmore College
2006-2022
Abstract We present a H i optical catalog of ∼30,000 galaxies based on the 100% complete Arecibo Legacy Fast L -band Feed Array (ALFALFA) survey combined with data from Sloan Digital Sky Survey (SDSS). Our goal is to facilitate public use completed ALFALFA by providing carefully determined matches SDSS counterparts, including for ∼10,000 that do not have spectra. These identifications can provide basis further crossmatching other surveys using photometric IDs as reference point. derive...
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 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 study the distribution of stars, H ii regions, molecular gas, and individual giant clouds in M33 over a wide range spatial scales. The clustering strength these components is systematically estimated through fractal dimension. find scale-free behavior at small scales transition to larger correlation dimension (consistent with nearly uniform distribution) region lies ∼500–1000 pc. This defines characteristic size that separates regime small-scale turbulent motion from large-scale galactic...
The autocorrelation function provides an objective test for the existence of special scales in hierarchical clustering young stars. We apply this measure to single-star photometry brightest main-sequence stars Small Magellanic Cloud (SMC), Large (LMC), M33, and M31, using data from Clouds Photometric Survey Massey Local Group Survey. Our primary result is identification a transition higher correlation dimension (weaker clustering) at 1 kpc LMC 300 pc M33. suggest that marks large-scale...
We present the correlation dimension of resolved young stars in four actively star-forming dwarf galaxies that are sufficiently and transparent to be modeled as projections three-dimensional point distributions. use data from Hubble Space Telescope archive; photometry for one galaxies, UGCA 292, is presented here first time. find there statistically distinguishable differences nature stellar clustering among sample galaxies. The VII Zw 403, brightest galaxy sample, have highest value most...
We present theoretical expectations for infall toward supercluster-scale cosmological filaments, motivated by the Arecibo Pisces-Perseus Supercluster Survey (APPSS) to map velocity field around (PPS) filament. use a minimum spanning tree applied dark matter halos size of galaxy clusters identify 236 large filaments within Millennium simulation. Stacking along their principal axes, we determine well-defined, sharp-peaked profile function that can be expressed in terms maximum rate $V_{\rm...
We present a strategy for estimating the mass per unit length along supercluster-scale filaments that are oriented across sky, based on mock redshift surveys of 264 from Millennium simulation. In our fiducial scenario, we place each simulated filament at distance 300 Mpc, perpendicular to line sight, and calculate dispersion using galaxies with magnitudes r<19.5. Some regions dynamically complicated in ways interfere finding simple relationship between sigma linear density mu. However, by...
Abstract We present a strategy for estimating the mass per unit length along supercluster-scale filaments that are oriented across sky, based on mock redshift surveys of 264 from Millennium simulation. In our fiducial scenario, we place each simulated filament at distance 300 Mpc, perpendicular to line sight, and calculate dispersion using galaxies with magnitudes r < 19.5. Some regions dynamically complicated in ways interfere finding simple relationship between σ linear density μ ....
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;...
The research landscape in many areas of science has migrated toward increasingly large collaborations with the work done over long time periods, making it ever more challenging to involve undergraduates cutting-edge projects.We describe our 19-institution collaboration founded promote undergraduate and faculty development within context an astronomical-survey project, discuss its efficacy, summarize how this model may be applied other large-scale projects.
We use fractal analysis to systematically study the clustering strength of distribution stars, HII regions, molecular gas, and individual giant clouds in M33 over a wide range spatial scales. find clear transition from scale-free behavior at small scales nearly uniform large The region lies 500-1000 pc it separates regime small-scale turbulent motion that large-scale galactic dynamics. three-dimensional dimension bright young stars gas is similar or less than 1.9 indicating interstellar...
The autocorrelation function provides an objective test for the existence of special scales in hierarchical clustering young stars. We apply this measure to single-star photometry brightest main sequence stars Small Magellanic Cloud (SMC), Large (LMC), M33, and M31, using data from Clouds Photometric Survey Massey Local Group Survey. Our primary result is identification a transition higher correlation dimension (weaker clustering) at one kpc LMC 300 pc M33. suggest that marks large-scale...