Joel Bregman

THE PRESENCE OF NONTHERMAL SYNCHROTRON EMISSION FROM RADIO TO ~100KEV IN YOUNG SHELL-TYPE SNRS IS A STRONG EVIDENCE OF CR ACCELERATION BY SNR BLAST WAVE. THE EXISTING RADIO/X-RAY DATA ARE NOT SENSITIVE TO THE HARD X-RAY TAILS OF SYNCHROTRON SPECTRUM, WHIC

GALAXY FORMATION MODELS PREDICT THAT MASSIVE SPIRAL GALAXIES PRODUCE EXTENSIVE HOT GASEOUS HALOS BY EXTERIOR ACCRETION SHOCKS AND GALACTIC FEEDBACK. HOWEVER, THE PROPERTIES OF THE HOT HALO, SUCH AS MASS, TEMPERATURE, AND METALLICITY ARE STRONGLY MODEL DEP

Collaborative Research: Redshift Measurements of the Swift Serendipitous Cluster Survey

THIS PROPOSAL TAKES ADVANTAGE OF THE SPECTRUM PRODUCED BY DUST GRAINS IN THE HALOS OF GALAXIES TO DETERMINE THE METAL CONTENT OF THE GAS IN WHICH THESE GRAINS ARE LOCATED. OUR AIM IS TO DETERMINE WHETHER THE METAL CONTENT OF THE HALO GAS DIFFERS AS A FUNC

IN RICH GALAXY CLUSTERS, ABOUT 80-90% OF THE METALS AND THE BARYONS LIE IN THE HOT INTRACLUSTER MEDIUM, WITH THE METALS BELIEVED TO ORIGINATE FROM THE GALAXIES WE SEE TODAY. HOWEVER, STUDIES SHOW THAT THE TOTAL METAL MASS SCALES WITH THE GAS MASS BUT NOT