Search Publications
Low-Mass X-Ray Binaries in Six Elliptical Galaxies: Connection to Globular Clusters
Lee, Myung Gyoon; Fabbiano, Giuseppina; Geisler, Doug +4 more
We present a systematic study of the low-mass X-ray binary (LMXB) populations of six elliptical galaxies, aimed at investigating the detected LMXB-globular cluster (GC) connection. We utilize Chandra archival data to identify X-ray point sources and HST archival data supplemented by ground observations to identify 6173 GCs. After screening and cro…
Enhanced Abundances in Three Large-Diameter Mixed-Morphology Supernova Remnants
Slane, P. O.; Lazendic, J. S.
We present an X-ray study of three mixed-morphology (MM) supernova remnants (SNRs)-HB 21, CTB 1, and HB 3-using archival ASCA and ROSAT data. These data are complemented by archival Chandra X-Ray Observatory data for CTB 1 and XMM-Newton X-Ray Observatory data for HB 3. The spectra from HB 21 and HB 3 are well described with a single-temperature t…
Current Sheet Evolution in the Aftermath of a CME Event
Raymond, J. C.; Bemporad, A.; Poletto, G. +4 more
We report on SOHO UVCS observations of the coronal restructuring following a coronal mass ejection (CME) on 2002 November 26, at the time of a SOHO-Ulysses quadrature campaign. Starting about 1.5 hr after a CME in the northwest quadrant, UVCS began taking spectra at 1.7 Rsolar, covering emission from both cool and hot plasma. Observatio…
The Excitation of Extended Red Emission: New Constraints on Its Carrier from Hubble Space Telescope Observations of NGC 7023
Gordon, Karl D.; Sell, Paul H.; Witt, Adolf N. +3 more
The carrier of the dust-associated photoluminescence process causing ERE in many dusty interstellar environments remains unidentified. Several competing models are more or less able to match the observed broad, unstructured ERE band. We now constrain the character of the ERE carrier further by determining the wavelengths of the radiation that init…
SN 1987A after 18 Years: Mid-Infrared Gemini and Spitzer Observations of the Remnant
Kirshner, Robert P.; Arendt, Richard G.; Danziger, John +6 more
Using the Gemini South 8 m telescope, we obtained high-resolution 11.7 and 18.3 µm mid-IR images of SN 1987A on day 6526 since the explosion. All the emission arises from the equatorial ring. Nearly contemporaneous spectra obtained at 5-38 µm with the Spitzer Space Telescope show that this is thermal emission from silicate dust that co…
Clustering of Star-forming Galaxies Near a Radio Galaxy at z=5.2
Ford, H. C.; Demarco, R.; Infante, L. +39 more
We present HST ACS observations of the most distant radio galaxy known, TN J0924-2201 at z=5.2. This radio galaxy has six spectroscopically confirmed Lyα-emitting companion galaxies and appears to lie within an overdense region. The radio galaxy is marginally resolved in i775 and z850, showing continuum emission aligned with …
INTEGRAL IBIS Extragalactic Survey: Active Galactic Nuclei Selected at 20-100 keV
Walter, R.; Bird, A. J.; Ubertini, P. +10 more
Analysis of International Gamma-Ray Astrophysics Laboratory (INTEGRAL) Core Programme and public open-time observations performed up to 2005 April provides a sample of 62 active galactic nuclei in the 20-100 keV band above a flux limit of ~1.5×10-11 ergs cm-2 s-1. Most (42) of the sources in the sample are Seyfert …
Interaction of a Moreton/EIT Wave and a Coronal Hole
Veronig, Astrid M.; Temmer, Manuela; Vršnak, Bojan +1 more
We report high-cadence Hα observations of a distinct Moreton wave observed at Kanzelhöhe Solar Observatory associated with the 3B/X3.8 flare and coronal mass ejection (CME) event of 2005 January 17. The Moreton wave can be identified in about 40 Hα frames over a period of 7 minutes. The EIT wave is observed in only one frame, but the derived propa…
Discovery of a Young Substellar Companion in Chamaeleon
Luhman, K. L.; Smith, J. D.; Brandner, W. +6 more
During an imaging survey of the Chamaeleon I star-forming region with the Advanced Camera for Surveys aboard the Hubble Space Telescope, we have discovered a candidate substellar companion to the young low-mass star CHXR 73 (τ~2 Myr, M~0.35 Msolar). We measure a projected separation of 1.30"+/-0.03" for the companion, CHXR 73 B, which c…
First Scattered Light Images of Debris Disks around HD 53143 and HD 139664
Kalas, Paul; Fitzgerald, Michael P.; Graham, James R. +1 more
We present the first scattered light images of debris disks around a K star (HD 53143) and an F star (HD 139664) using the coronagraphic mode of the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). With ages of 0.3-1 Gyr, these are among the oldest optically detected debris disks. HD 53143, viewed ~45° from edge-on, doe…