A5033658510- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Atomic and Molecular Physics
- Relativity and Gravitational Theory
- Noncommutative and Quantum Gravity Theories
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Advanced Chemical Physics Studies
- Astronomical Observations and Instrumentation
- Laser-Matter Interactions and Applications
- Molecular spectroscopy and chirality
- Quantum, superfluid, helium dynamics
- Radioactive Decay and Measurement Techniques
- Spectroscopy and Quantum Chemical Studies
- Advanced Physical and Chemical Molecular Interactions
- Various Chemistry Research Topics
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Research and Discoveries
- Mechanical and Optical Resonators
- Black Holes and Theoretical Physics
Pennsylvania State University
2017-2024
Virginia Tech
2011-2017
Emory and Henry College
2017
SRON Netherlands Institute for Space Research
2012
University of Missouri–St. Louis
1996-1997
Michigan State University
1989
Aims. Active galactic nuclei (AGN) often show evidence of photoionized outflows. A major uncertainty in models for these outflows is the distance (R) to gas from central black hole. In this paper we use HST/COS data a massive multi-wavelength monitoring campaign on bright Seyfert I galaxy Mrk 509, combination with archival HST/STIS data, constrain location various kinematic components outflow.
We present medium resolution (R~20,000) HST/COS ultraviolet spectra covering 1155-1760 A of the Seyfert 1 Mrk 509 obtained simultaneously with a Chandra/LETGS spectrum as part multiwavelength campaign in 2009 that included observations XMM-Newton, SWIFT, and Integral. Our high S/N detects additional complexity absorption troughs from variety sources 509, including outflow active nucleus, ISM halo host galaxy, infalling clouds or stripped gas merger are illuminated by AGN. Variability between...
Modified dark matter (MDM) is a phenomenological model of matter, inspired by gravitational thermodynamics. For an accelerating Universe with positive cosmological constant ($\Lambda$), such considerations lead to the emergence critical acceleration parameter related $\Lambda$. Such effective manifestation MDM, and it found in correlations between baryonic galaxy rotation curves. The resulting MDM mass profiles, which are sensitive $\Lambda$, consistent observational data at both galactic...
We discuss the possibility that cold dark matter mass profiles contain information on cosmological constant, and such constrains nature of (CDM). call this approach Modified Dark Matter (MDM). In particular, we examine ability MDM to explain observed 13 galaxy clusters. Using general arguments from gravitational thermodynamics, provide a theoretical justification for our profile successfully compare it NFW both cluster galactic scales. Our results suggest indeed CDM about constant in non-trivial way.
In this paper we analyze the X-ray, UV, and optical data of Seyfert 1.5 galaxy 1H0419-577 with aim detecting studying an ionized-gas outflow. The source was observed simultaneously in X-rays XMM-Newton UV HST-COS. Optical were also acquired Monitor. We detected a thin, lowly ionized warm absorber (log ξ ≈ 0.03, log NH 19.9 cm-2) X-ray spectrum, which is consistent to be produced by same outflow already UV. Provided gas density estimated located host at ~kpc scale. Narrow emission lines...
The authors describe the triggering system for D0 Experiment at Tevatron proton-antiproton collider. They first give an overview of structure trigger and data acquisition systems with particular attention to principal signal paths. calorimeter is described, some Monte Carlo studies that were done investigate performance determine its design parameters are discussed. current status examined.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
An acceleration scale of order $10^{-10}\mathrm{m/s^2}$ is implicit in the baryonic Tully-Fisher and Faber-Jackson relations, independently any theoretical preference or bias. We show that existence this relation most apparent when data from pressure supported systems vastly different scales including globular clusters, elliptical galaxies, galaxy clusters are analyzed together. This suggests relevance to structure formation processes at many length could be pointing a heretofore unknown...
Modified Dark Matter (MDM) is a phenomenological model of dark matter, inspired by gravitational thermodynamics, that naturally accounts for the universal acceleration constant observed in galactic rotation curve data; critical related to cosmological constant, $\Lambda$, appears as manifestation MDM. We show resulting mass profiles, which are sensitve consistent with observations at and galaxy cluster scales. Our results suggest matter profiles contain information about non-trivial way.
Observations of velocity dispersions galactic structures over a wide range scales point to the existence universal acceleration scale $a_0\sim 10^{-10}$ m/s$^2$. Focusing on fuzzy dark matter paradigm, which proposes ultralight with mass around $10^{-22}$ eV and de Broglie wavelength $\lambda\sim {\rm few}\times10^{2}$ parsecs, we highlight emergence observed from quantum effects in fluid-like description dynamics. We then suggest possibility natural connection between energy within same paradigm.
Observations of velocity dispersions galactic structures over a wide range scales point to the existence universal acceleration scale [Formula: see text][Formula: text]m/s 2 . Focusing on fuzzy dark matter paradigm, which proposes ultralight with mass around text]eV and de Broglie wavelength text] parsecs, we highlight emergence observed from quantum effects in fluid-like description dynamics. We then suggest possibility natural connection between energy within same paradigm.
Using Floquet spectroscopy, we have measured the scalar and tensor polarizabilities of a nominally hydrogenic state multielectron atom. We obtain ${\mathrm{\ensuremath{\alpha}}}_{0}$=426.1\ifmmode\pm\else\textpm\fi{}16 MHz/(V/cm${)}^{2}$ ${\mathrm{\ensuremath{\alpha}}}_{2}$=-66.3\ifmmode\pm\else\textpm\fi{}22 MHz/(V/${\mathrm{cm}}^{2}$) for Stark states linked to 30${\mathit{d}}^{2}$D zero-field sodium, which compare with results several theoretical treatments. also mapped important...
To elucidate the location, physical conditions, mass outflow rate, and kinetic luminosity of from active nucleus Seyfert 1 galaxy Mrk 509 we used coordinated ultraviolet X-ray spectral observations in 2012 to follow up our lengthier campaign conducted 2009. We observed with Cosmic Origins Spectrograph (COS) on Hubble Space Telescope (HST) 2012-09-03 2012-10-11 using High Energy Transmission Grating Chandra Observatory. Our far-ultraviolet spectra grating G140L COS cover wavelengths 920--2000...
We discuss the existence of an acceleration scale in galaxies and galaxy clusters. The presence same found at very different scales astrophysical objects strongly supports a fundamental governing observed gravitational physics. also comment on implication such problem dark matter. relevance for nature matter as well structure formation to be explored future numerical simulations.
It is well known that for the nonrelativistic hydrogen atom it possible to separate Schrödinger equation in parabolic as spherical coordinates. The eigenfunctions obtained these coordinate systems are each a suitable basis set absence of an electric field, but only states, Stark eigenfunctions, retain their character presence weak field. properties coherent superpositions states investigated and motion resulting wave packet described. shown properly constituted superposition will mimic...
We discuss the relevance of quantum gravity to frontier questions in high energy phenomenology: problems dark matter, energy, and vacuum selection as well emergent spacetime wormholes. Dark matter phenomenology, problem are discussed within context string theory a model gravity. Emergent wormholes more general effective theories
The mechanism by which an external electric field induces in atom dipole moment is discussed from classical and quantal points of view. It shown that the expressions for atomic polarizability α derived each these viewpoints are, to same level approximation, identical. perspective is, however, more intuitive provides a insightful picture. presentation at undergraduate level.
In this paper we analyze the X-ray, UV and optical data of Seyfert 1.5 galaxy 1H0419-577, with aim detecting studying an ionized-gas outflow. The source was observed simultaneously in X-rays XMM HST-COS. Optical were also acquired Monitor. We detected a thin, lowly ionized warm absorber (log xi ~ 0.03, log NH ~19.9 cm^-2) X-ray spectrum, consistent to be produced by same outflow already UV. Provided gas density estimated UV, is located host galaxy, at kpc scale. Narrow emission lines X-rays,...