Search Publications
A Search for Early Optical Emission at Gamma-Ray Burst Locations by the Solar Mass Ejection Imager (SMEI)
Band, David L.; Jackson, Bernard V.; Buffington, Andrew +2 more
The Solar Mass Ejection Imager (SMEI) views nearly every point on the sky once every 102 minutes and can detect point sources as faint as R~10 mag. Therefore, SMEI can detect or provide upper limits for the optical afterglow from gamma-ray bursts in the tens of minutes after the burst, when different shocked regions may emit optically. Here we pro…
X-Ray Emission from the Double Neutron Star Binary B1534+12: Powered by the Pulsar Wind?
Garmire, G. P.; Pavlov, G. G.; Kargaltsev, O.
We report the detection of the double neutron star binary (DNSB) B1534+12 (=J1537+1155) with the Chandra X-Ray Observatory. This DNSB (Porb=10.1 hr) consists of the millisecond (recycled) pulsar J1537+1155A (PA=37.9 ms) and a neutron star not detected in the radio. After the remarkable double pulsar binary J0737-3039, it is t…
The Low-Mass Initial Mass Function of the Field Population in the Large Magellanic Cloud with Hubble Space Telescope WFPC2 Observations
Henning, Th.; Brandner, W.; Gouliermis, D.
We present V- and I-equivalent HST WFPC2 stellar photometry of an area in the Large Magellanic Cloud (LMC), located to the west of the bar of the galaxy, which accounts for the general background field of its inner disk. The WFPC2 observations reach magnitudes as faint as V=25 mag, and the large sample of more than 80,000 stars allows us to determ…
Three Gravitational Lenses for the Price of One: Enhanced Strong Lensing through Galaxy Clustering
McKean, J. P.; Treu, T.; Blandford, R. D. +7 more
We report the serendipitous discovery of two strong gravitational lens candidates (ACS J160919+6532 and ACS J160910+6532) in deep images obtained with the Advanced Camera for Surveys on the Hubble Space Telescope, each less than 40" from the previously known gravitational lens system CLASS B1608+656. The redshifts of both lens galaxies have been m…
Three-dimensional Structure of the 2002 April 21 Coronal Mass Ejection
Raymond, J. C.; Ko, Y. -K.; Lee, J. -Y. +1 more
A three-dimensional reconstruction of the 2002 April 21 partial halo Coronal Mass Ejection (CME) has been made based on the O VI 1032 Å and [Fe XVIII] 974 Å lines observed by the Ultraviolet Coronagraph Spectrometer (UVCS) on board the Solar and Heliospheric Observatory (SOHO). We use the Doppler velocities to derive the CME structure along the li…
Ultraviolet Observations of Prominence Activation and Cool Loop Dynamics
Landi, E.; Kucera, T. A.
In this paper we investigate the thermal and dynamic properties of dynamic structures in and around a prominence channel observed on the limb on 2003 April 17. Observations were taken with the Solar and Heliospheric Observatory's Solar Ultraviolet Measurements of Emitted Radiation (SOHO SUMER) in lines formed at temperatures from 80,000 K to 1.6 M…
Line Shape Changes and Doppler Measurements in Solar Active Regions. I. A Method for Correcting Dopplergrams from SOHO MDI
Schou, J.; Wachter, R.; Sankarasubramanian, K.
We present a method to correct MDI high-resolution Dopplergrams in active regions for systematic observational errors due to the spectral line shape changes. We use a measurement campaign with the Advanced Stokes Polarimeter to investigate the influence of line shape changes in active regions on MDI Dopplergram calibration. An estimate of the widt…
Oxygen Abundance and Energy Deposition in the Slow Coronal Wind
Abbo, L.; Antonucci, E.; Telloni, D.
Observations of the extended corona obtained with the Ultraviolet Coronagraph Spectrometer (UVCS) on board the Solar and Heliospheric Observatory (SOHO) during the solar minimum years 1996 and 1997 have been analyzed to derive the oxygen abundance in the outer corona. A comparison of the absolute coronal abundance, measured in the coronal regions …
X-Ray Observations of SN 1006 with INTEGRAL
Rho, J.; Lund, N.; Boggs, S. E. +4 more
The remnant of the supernova of 1006 AD, the remnant first showing evidence for the presence of X-ray synchrotron emission from shock-accelerated electrons, was observed for ~1000 ks with INTEGRAL in order to study electron acceleration to very high energies. The aim of the observation was to characterize the synchrotron emission and attempt to de…
Morphology and Evolution of Emission-Line Galaxies in the Hubble Ultra Deep Field
Panagia, N.; Ferguson, H. C.; Koekemoer, A. M. +8 more
We investigate the properties and evolution of a sample of galaxies selected to have prominent emission lines in low-resolution grism spectra of the Hubble Ultra Deep Field (HUDF). These objects, eGRAPES, are late-type blue galaxies characterized by small proper sizes (R50<=2 kpc) in the 4350 Å rest frame, low masses (5×109