A5059154431- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Scientific Computing and Data Management
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Research Data Management Practices
- Distributed and Parallel Computing Systems
- Advanced Data Storage Technologies
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
- Molecular Spectroscopy and Structure
- Mathematics, Computing, and Information Processing
- Big Data and Business Intelligence
- History and Developments in Astronomy
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Advanced Computational Techniques and Applications
- Adaptive optics and wavefront sensing
University of Maryland, College Park
2014-2024
Institut Pasteur
2022
English Heritage
2022
Software (Spain)
2022
University of Illinois Urbana-Champaign
2016
Instituto Argentino de Radioastronomía
2016
Centro Científico Tecnológico - La Plata
2016
National Radio Astronomy Observatory
1997
University of Groningen
1987
The Astrophysics Source Code Library (ASCL), founded in 1999, is a free on-line registry for source codes of interest to astronomers and astrophysicists. library housed on the discussion forum Astronomy Picture Day (APOD) can be accessed at http://ascl.net. ASCL has comprehensive listing that covers significant number astrophysics used generate results published or submitted refereed journals continues grow. currently entries over 500 codes; its records are citable indexed by ADS. editors...
A new code for astrophysical magnetohydrodynamics (MHD) is described. The has been designed to be easily extensible use with static and adaptive mesh refinement. It combines higher-order Godunov methods the constrained transport (CT) technique enforce divergence-free constraint on magnetic field. Discretization based cell-centered volume-averages mass, momentum, energy, face-centered area-averages Novel features of algorithm include (1) a consistent framework computing time- edge-averaged...
We suggest that the high-velocity clouds (HVCs) are large clouds, with typical diameters of 25 kpc, containing 3×107 M☉ neutral gas and 3×108 dark matter, falling onto Local Group; altogether HVCs contain 1010 gas. Our reexamination Group hypothesis for connects their properties to hierarchical structure formation scenario seen in absorption toward quasars. show at least one HVC complex (besides Magellanic Stream) must be extragalactic a distance more than 40 kpc from Galactic center,...
We present an analysis of the molecular gas distributions in 29 barred and 15 unbarred spirals BIMA CO (J = 1-0) Survey Nearby Galaxies (SONG). For galaxies that are bright CO, we confirm conclusion by Sakamoto et al. have higher concentrations central kiloparsec. The SONG sample also includes 27 below brightness limit used Even these less CO-bright show high more common galaxies, consistent with radial inflow driven bar. However, there is a significant population early-type (Sa-Sbc) (6 19)...
The Flexible Image Transport System -FITS -has been in use the astronomical community for over two decades. A newly updated version of standard has recently approved by International Astronomical Union FITS Working Group. This new appears here its entirety. As a preface we briefly describe process which evolves and revisions are approved, note minor changes to NOST 100-2.0 were adopted IAU FWG.
We report results of a multiwavelength campaign to measure the simultaneous spectrum supermassive black hole candidate Sgr A* in Galactic center from centimeter millimeter wavelengths using Very Large Array, Berkeley-Illinois-Maryland Array (BIMA), Nobeyama 45 m, and Institut de Radioastronomie Millimetrique (IRAM) 30 m telescopes. The observations confirm that previously detected excess is an intrinsic feature A*. can be interpreted as effect presence ultracompact component relativistic...
Massive star formation occurs in giant molecular clouds (GMCs); an understanding of the evolution GMCs is a prerequisite to develop theories and galaxy evolution. We report highest-fidelity observations grand-design spiral M51 carbon monoxide (CO) emission, revealing vis-a-vis large-scale galactic structure dynamics. The most massive (giant associations (GMAs)) are first assembled then broken up as gas flow through arms. GMAs their H2 molecules not fully dissociated into atomic predicted...
Abstract We present interferometric CO observations, made with the Combined Array for Millimeter-wave Astronomy (CARMA) interferometer, of galaxies from Extragalactic Database Galaxy Evolution survey (EDGE). These are selected Calar Alto Legacy Integral Field Area (CALIFA) sample, mapped optical integral field spectroscopy. EDGE provides good-quality data (3 σ sensitivity <?CDATA ${{\rm{\Sigma }}}_{\mathrm{mol}}\sim 11$?> ${M}_{\odot }\,{\mathrm{pc}}^{-2}$?> before inclination correction,...
view Abstract Citations (192) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Nuclear Rings and Mass Inflow in Hydrodynamic Simulations of Barred Galaxies Piner, B. Glenn ; Stone, James M. Teuben, Peter J. We study the gas dynamics barred galaxies using time-dependent hydrodynamic simulations. To achieve high resolution near galaxy's center, simulations are performed cylindrical coordinates a nonuniform radial grid. The gravitational potential...
We describe the characteristics of BIMA millimeter wave array at Hat Creek, California. The is an aperture synthesis instrument consisting 9 6-meter diameter antennas which may be deployed in three differenet configurations, with spacings ranging from 7 meters up to 1.3 km. At observing frequency 100 GHz these configurations yield maps angular resolutions 5", 2", and 0.4", over a 2' field. Larger fields mapped by using multiple pointings. For all but oldest telescopes, surface accuracy ≤ 30...
We compare the distribution of molecular gas and star formation activity in bar region six spirals (NGC 2903, NGC 3627, 4321, 5457, 6946, & IC 342) from BIMA Survey Nearby Galaxies (SONG). The gas, traced using CO (J=1--0) emission line, is brightest along leading edge stellar dust lanes. activity, Halpha offset towards side emission. A cross-correlation analysis shows that a) HII regions are 0--800 pc on emission, b) largest offsets found strongest bars, c) there a wide range single...
We present Spitzer Space Telescope observations of the "evolved starless core" L1521F that reveal presence a very low luminosity object (L < 0.07 L☉). The object, L1521F-IRS, is directly detected at mid-infrared wavelengths (>5 μm), but only in scattered light shorter infrared wavelengths, showing bipolar nebula oriented east-west probably tracing an outflow cavity. strongly suggests L1521F-IRS embedded core. Thus, similar to recently discovered L1014-IRS and previously known IRAM 04191 its...
We use CO and H alpha velocity fields to study the gas kinematics in spiral arms interarms of M51 (NGC 5194), fit 2D field estimate radial tangential components as a function phase (arm distance). find large streaming velocities, which are qualitatively consistent with predictions density wave theory support existence shocks. The motions complex, varying significantly across galaxy well along between arms. Aberrations indicate that disk is not coplanar, perhaps far 20\arcsec\ (800 pc) from...
The inner regions of barred galaxies contain substructures such as off-axis shocks, nuclear rings, and spirals. These may affect star formation, control the activity a central black hole (BH) by determining mass inflow rate. We investigate formation properties using high-resolution, grid-based hydrodynamic simulations. gaseous medium is assumed to be infinitesimally thin, isothermal, non-self-gravitating. stars dark matter are represented static gravitational potential with four components:...
We present high-resolution CARMA 230 GHz continuum imaging of nine deeply embedded protostars in the Serpens Molecular Cloud, including six known Class 0 Serpens. This work is part a program to characterize disk and envelope properties for complete sample nearby low-mass star-forming regions. Here, we maps visibility amplitudes as function uv-distance sample. Observations are made B, C, D, E antenna configurations, with B configuration observations utilizing Paired Antenna Calibration...
If the interstellar medium (ISM) in a galaxy is driven into nuclear region, it will change evolution of galaxy. Although generally assumed that bars are efficient at driving ISM to smaller radii, how characteristics bar affect inflow has never been examined detail. In this paper we investigate various ability drive radii. We model using high-resolution hydrodynamic simulations and able show weak have almost no effect on radial distribution ISM. also find for all strengths, only gas down...
We report here results of high-resolution hydrodynamical simulations gas flows in barred galaxies, with a focus on dynamics the central kiloparsec. In single bar an Inner Lindblad Resonance, we find either near-circular motion nuclear ring, or spiral shock extending towards galaxy center, depending sound speed gas. From simple model dynamically-possible doubly resonant coupling, infer that secondary is likely to end well inside its corotation. Such cannot create shocks flow, and therefore...
We present results of the largest three-color near-infrared (NIR) imaging survey ρ Ophiuchi star-forming cloud core to date. The covers 1 deg2, which corresponds a projected area ~2.2 pc × 2.2 at distance Ophiuchus clouds (125 ± 25 pc). Mapping was carried out in J (1.25 μm), H (1.63 and K (2.22 μm) bands, 90%, 10 σ completeness limits = 15.0, 14.5, 14.0. have cataloged 4495 sources, 2070 ≤ 14.0 2425 more either 5 or better detections band (for 14.5) 4 least two three bands ≥ 14.5). accurate...
Context. We report on new simultaneous observations and modeling of the millimeter, near-infrared, X-ray flare emission source Sagittarius A* (SgrA*) associated with super-massive (4 × 106 M⊙) black hole at Galactic center.
We present maps of 14.4 deg2 the Ophiuchus dark clouds observed by Spitzer Space Telescope Multiband Imaging Photometer for (MIPS). These high-quality depict both numerous point sources and extended dust emission within star-forming non-star-forming portions these clouds. Using PSF-fitting photometry, we detect 5779 at 24 μm 81 70 10 σ level significance. Three hundred twenty-three candidate young stellar objects (YSOs) were identified according to their positions on MIPS/2MASS K versus − [...
We report the CO(J = 1–0) observations of Whirlpool Galaxy M51 using both Combined Array for Research in Millimeter Astronomy (CARMA) and Nobeyama 45 m telescope (NRO45). describe a procedure combination interferometer single-dish data. In particular, we discuss (1) joint imaging deconvolution heterogeneous data, (2) weighting scheme based on root-mean-square (rms) noise maps, (3) sensitivity uv coverage requirements, (4) flux recovery combined map. generate visibilities from map calculate...
We present the Evolution of molecular Gas in Normal Galaxies (EGNoG) survey, an observational study gas 31 star-forming galaxies from z=0.05 to z=0.5, with stellar masses (4-30)x10^10 M_Sun and star formation rates 4-100 yr^-1. This survey probes a relatively un-observed redshift range which content is expected have evolved significantly. To trace EGNoG galaxies, we observe CO(1-0) CO(3-2) rotational lines using Combined Array for Research Millimeter-wave Astronomy (CARMA). detect 24...