449 citations · 1.2k across the 17 of their papers we have counts for
8 papers · 1 filter
A New Catalog of Radio Compact HII Regions in the Milky Way
Uriel Giveon, Robert H. Becker, David J. Helfand +1
We utilize new VLA Galactic plane catalogs at 5 and 1.4 GHz covering the first Galactic quadrant (350<l<42, |b|<0.4) in conjunction with the MSX6C Galactic plane catalog to constru…
The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) Program: II. Optical Imaging
Megan E. Eckart, Elise S. Laird, Daniel Stern +3
The Serendipitous Extragalactic X-ray Source Identification (SEXSI) Program is designed to expand significantly the sample of identified extragalactic hard X-ray sources at interme…
Weak Lensing by Large-Scale Structure with the FIRST Radio Survey
Tzu-Ching Chang, Alexandre Refregier, David J. Helfand
We present the first measurement of weak lensing by large-scale structure on 1-4 degree scales based on the FIRST Radio Survey, a quarter-sky, 20-cm survey produced with the NRAO V…
A Galaxy at z = 6.545 and Constraints on the Epoch of Reionization
Daniel Stern, Sarah A. Yost, Megan E. Eckart +5
We report the discovery of a Lyman-alpha-emitting galaxy at redshift z=6.545 serendipitously identified in the course of spectroscopic follow-up of hard X-ray sources on behalf of…
New Constraints on the Structure and Evolution of the Pulsar Wind Nebula 3C 58
Patrick Slane, David J. Helfand, Eric van der Swaluw +1
We present an investigation of the spectral and spatial structure of the X-ray emission from 3C 58 based on a 350 ks observation with the Chandra X-ray Observatory. This deep image…
X-ray, Radio, and Optical Observations of the Putative Pulsar in the Supernova Remnant CTA 1
J. P. Halpern, E. V. Gotthelf, F. Camilo +2
A Chandra image of the central X-ray source RX J0007.0+7303 in the supernova remnant CTA 1 reveals a point source, a compact nebula, and a bent jet, all of which are characteristic…