A5051433273- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Antenna Design and Optimization
- Superconducting and THz Device Technology
- Methane Hydrates and Related Phenomena
- Radio Astronomy Observations and Technology
- Geology and Paleoclimatology Research
- Antenna Design and Analysis
- Pulsars and Gravitational Waves Research
- History and Developments in Astronomy
- Geomagnetism and Paleomagnetism Studies
- High-pressure geophysics and materials
- Space Exploration and Technology
- Adaptive optics and wavefront sensing
- Magnetic confinement fusion research
- Astrophysics and Cosmic Phenomena
- Phase Equilibria and Thermodynamics
- Advanced Antenna and Metasurface Technologies
- Solar and Space Plasma Dynamics
Farmingdale State College
2014-2023
American Museum of Natural History
2018
Boston University
2006-2011
American University in Cairo
2011
We present first results from a very deep (~650 ksec) Chandra X-ray observation of Abell 2052, as well archival VLA radio observations. The data reveal detailed structure in the inner parts cluster, including bubbles evacuated by AGN's lobes, compressed bubble rims, filaments, and loops. Two concentric shocks are seen, temperature rise is measured for innermost one. On larger scales, we report detection an excess surface brightness spiral feature. has cooler temperatures, lower entropies,...
We present results from a deep Chandra observation of Abell 2052. A2052 is bright, nearby, cooling flow cluster, at redshift z=0.035. Concentric surface brightness discontinuities are revealed in the cluster center, and these features consistent with shocks driven by AGN, both Mach numbers approximately 1.2. The southern cavity now appears to be split into two cavities southernmost likely representing ghost bubble earlier radio activity. There also NW center. cycle time measured for source 2...
Abstract We present a multiwavelength study of the massive galaxy cluster Abell 1763 at redshift z = 0.231. Image analysis 19.6 ks Chandra archival observation reveals cluster-wide spiral enhanced surface brightness in intracluster medium (ICM). While such spirals are understood to form clusters with sloshing strong cool cores (SCCs), gas comprising spiral’s apex is intermediate entropy (∼110 keV cm 2 ) and cooling time (∼6.8 Gyr), indicating core disruption occurring throughout formation...
We present new radio and X-ray observations of Abell 262. The residual image provides the first evidence an tunnel in this system while data reveal that central source is more than three times larger previously known. find well-known cluster-center S-shaped B2 0149+35 surrounded by extended emission to east south-west. south-western extension co-spatial with seen our Chandra images eastern shows clumps innermost coincident a faint cavity. outer two extensions are newly detected depression....
We present a Chandra X-ray observation and VLA radio observations of the nearby (z=0.11) galaxy cluster Abell 562 wide angle tail (WAT) source 0647+693. The displays signatures an ongoing merger leading to bending WAT including elongation surface brightness distribution along line that bisects WAT, excess displaced gas found between lobes, anisotropies within ICM projected temperature abundance distributions. most likely geometry interaction is head-on occurring axis. By combining observable...
Wide-angle tail (WAT) radio sources are often found in the centers of galaxy clusters where intracluster medium (ICM) ram pressure may bend lobes into their characteristic C-shape. We examine low-redshift (z = 0.1035) cluster Abell 1446, host to WAT source 1159+583. The exhibits possible evidence for a small-scale cluster-subcluster merger as cause morphology. This includes presence temperature and substructure along line that bisects WAT, well wake stripped interstellar material or...
Abstract We present Chandra X-ray observations of the dynamically complex galaxy cluster A119 ( z = 0.044). is host to two narrow-angle-tail (NAT) radio sources (0053-015 and 0053-016), whose tails are oriented parallel each other, despite orthogonally jet axes. Imaging spectral analysis reveal emission elongated along NE–SW axis, with presence structures, including surface brightness discontinuities, which suggest possible merger activity this axis. From radial profiles brightness,...
We are conducting a large survey of distant clusters galaxies using radio sources with bent jets and lobes as tracers. These driven by AGN achieve their morphologies through interaction the surrounding gas found in galaxies. Based on low-redshift studies, these types can be used to identify very efficiently. present initial results from our 653 bent-double optical hosts too faint appear SDSS. The sample was observed infrared Spitzer, it has revealed $\sim$200 or proto-clusters redshift range...
We present Chandra X-ray observations of the dynamically complex galaxy cluster Abell 119 ($z = 0.044$). A119 is host to two NAT radio sources (0053-015 & 0053-016) whose tails are oriented parallel each other despite orthogonally jet axes. Imaging and spectral analysis reveal emission elongated along NE-SW axis with presence structures, including surface brightness discontinuities, which suggest possible merger activity this axis. From radial profiles brightness, temperature, pressure,...