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7 papers · 2 filters
Signatures of kinetic and magnetic helicity in the CMBR
Levon Pogosian, Tanmay Vachaspati, Serge Winitzki
P and CP violation in cosmology can be manifested as large-scale helical velocity flows in the ambient plasma and as primordial helical magnetic fields. We show that kinetic helici…
A New Way to Detect Massive Black Holes in Galaxies: The Stellar Remnants of Tidal Disruption
R. Di Stefano, J. Greiner, S. Murray +1
We point out that the tidal disruption of a giant may leave a luminous (10^35-10^39 ergs/s), hot (10-100 eV) stellar core. The ``supersoft'' source detected by Chandra at the cente…
Cosmic String Signatures in the Cosmic Microwave Background Anisotropies
Alejandro Gangui, Levon Pogosian, Serge Winitzki
We briefly review certain aspects of cosmic microwave background anisotropies as generated in passive and active models of structure formation. We then focus on cosmic strings base…
HST-WFPC2 Observations of the Star Clusters in the Giant HII Regions of M33
Myung Gyoon Lee, Hong Soo Park, Sang Chul Kim +4
We present a photometric study of the stars in ionizing star clusters embedded in several giant HII regions of M33 (CC93, IC 142, NGC 595, MA2, NGC 604 and NGC 588). Our photometry…
Quantum Gravity and Astrophysics: The Microwave Background and Other Thermal Sources
Rosanne Di Stefano, L. H. Ford, Hongwei Yu +1
The problem of formulating a fully consistent quantum gravity theory (QGT) has not yet been solved. Even before we are able to work out the details of a complete theory, however, w…
Bright X-Ray Sources in M31 Globular Clusters
R. Di Stefano, A. K. H. Kong, M. R. Garcia +4
We have conducted Chandra observations of ~2560 square arcmin (~131 kpc^2) of of M31, and find that the most luminous X-ray sources in our fields are in globular clusters (GCs). Of…