Search Publications
A Fresh View of Henize 2-10 with VLT NAOS-CONICA
Cabanac, Rémi A.; Vanzi, Leonardo; Sauvage, Marc
We present high-resolution observations of Henize 2-10 in Ks (2.2 µm), L' (3.8 µm), and M' (4.8 µm) bands. These allow us, for the first time, to track accurately the structures at the heart of the galaxy from the optical to the radio. All radio knots previously observed can now be associated with L'- and Ks…
The Halo, Hot Spots, and Jet/Cloud Interaction of PKS 2153-69
Young, A. J.; Heinz, S.; Wilson, A. S. +1 more
We report Chandra X-Ray Observatory and 1.4 GHz Australian Long Baseline Array (LBA) observations of the radio galaxy PKS 2153-69 and its environment. The Chandra image reveals a roughly spherical halo of hot gas extending out to 30 kpc around PKS 2153-69. Two depressions in the surface brightness of the X-ray halo correspond to the large-scale ra…
Far Ultraviolet Spectroscopic Explorer Observations of the Symbiotic Star AG Draconis
Young, P. R.; Dupree, A. K.; Espey, B. R. +2 more
Spectra of the bright symbiotic star AG Draconis (BD +67°922) in the wavelength range 905-1187 Å obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) are presented. The spectra show a number of narrow, nebular emission lines, together with a uniform continuum from the hot component of the system, and numerous interstellar absorption lin…
An X-Ray View of Weak-Line Radio Galaxies/LINERs
Gliozzi, Mario; Sambruna, Rita M.; Rinn, Alexander S.
We present X-ray observations of nine weak-line radio galaxies (WLRGs), optically classified as confirmed or possible LINERs. The data were taken from the Chandra, XMM-Newton, and BeppoSAX archives. The Chandra images typically show complex X-ray morphologies, with hard (2-10 keV) point sources embedded in diffuse soft (0.3-2.0 keV) emission in al…
Kinetic Helicity Density in Solar Subsurface Layers and Flare Activity of Active Regions
Howe, R.; Komm, R.; Hill, F. +2 more
We search for a relation between subsurface flows below active regions and flare events occurring in those regions. For this purpose, we use a ring-diagram analysis to determine the subsurface flows from high-resolution Global Oscillation Network Group (GONG) and Michelson Doppler Imager (MDI) data and derive the kinetic helicity as a measure of t…
Late-Time X-Ray, UV, and Optical Monitoring of Supernova 1979C
Van Dyk, Schuyler D.; Petre, Robert; Rudie, Gwen C. +8 more
We present results from observations of supernova (SN) 1979C with the Newton X-Ray Multi-Mirror (XMM-Newton) mission in X-rays and in UV, archival X-ray, and Hubble Space Telescope (HST) data, and follow-up ground-based optical imaging. The XMM-Newton MOS spectrum shows the best-fit two-temperature thermal plasma emission characteristics of both t…
The Intrinsic Properties of SMM J14011+0252
Smith, G. P.; Ivison, R. J.; Smail, Ian
We discuss the properties of the bright submillimeter source SMM J14011+0252 at z=2.56, which lies behind the central regions of the z=0.25 lensing cluster A1835. This system has a complex optical morphology consisting of at least five separate components. We reassess the extensive multiwavelength observations of this system and find strong suppor…
The FUSE Spectrum of the Planetary Nebula SwSt 1: Evidence for Inhomogeneities in the Gas and Dust
Redfield, Seth; Dinerstein, Harriet L.; Bowers, C. W. +1 more
We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the young, compact planetary nebula (PN) SwSt 1 along the line of sight to its central star HD 167362. We detect circumstellar absorption lines from several species against the continuum of the central star. The physical parameters of the nebula derived from the FUSE data dif…
Cool Customers in the Stellar Graveyard. I. Limits to Extrasolar Planets Around the White Dwarf G29-38
Debes, John H.; Woodgate, Bruce E.; Sigurdsson, Steinn
We present high-contrast images of the hydrogen white dwarf G29-38 taken in the near-infrared with the Hubble Space Telescope and the Gemini North Telescope as part of a high-contrast imaging search for substellar objects in orbit around nearby white dwarfs. We review the current limits on planetary companions for G29-38, the only nearby white dwa…
Spectropolarimetry and Radiative Transfer Modeling of Three Proto-Planetary Nebulae
Gordon, Karl D.; Bieging, John H.; Schmidt, Gary D. +3 more
We measured the spectrum of polarization for three proto-planetary nebulae (PPNs), IRAS 17411-2411, IRAS 08005-2356, and IRAS 04296+3429, and made model calculations with the dust-scattering Monte Carlo code DIRTY and the dust emission code 2Dust. We show that high levels of polarization in these PPNs correlate with extreme asymptotic giant branch…