Search Publications
Response of the groove in heliospheric Lyman-alpha glow to latitude-dependent ionization rate
Bzowski, M.
I study the model response of the latitudinal profile of the heliospheric Lyman-alpha glow to various profiles of the ionization rate. The two profiles are characterized by their range separately in the north and south hemisphere, and by the contrast between the equator values and north and south pole values. These parameters define a mesh of the …
The Gravitational Lens B1608+656. I. V-, I-, and H-Band Hubble Space Telescope Imaging
Blandford, R. D.; Surpi, G.
We present a multiwavelength analysis of high-resolution observations of the quadruple lens B1608+656 from the Hubble Space Telescope archive, acquired with WFPC2 through filters F606W (V band) and F814W (I band) and with NIC1 in filter F160W (H band). In the three bands, the observations show extended emission from the four images of the source i…
The Quintuple Quasar: Radio and Optical Observations
Keeton, Charles R.; Winn, Joshua N.; Kochanek, Christopher S. +1 more
We present results from high-resolution radio and optical observations of PMN J0134-0931, a gravitational lens with a unique radio morphology and an extremely red optical counterpart. Our data support the theory of Keeton & Winn: five of the six observed radio components are multiple images of a single quasar, produced by a pair of lens galaxi…
Hα Impact Polarization Observed in a Gradual Flare
Hanaoka, Y.
Linear polarization of the Hα line was detected in kernels of a gradual flare, which was accompanied by a filament eruption. The maximum degree of polarization of this flare exceeds 1%, and the orientation of the polarization is approximately perpendicular to the flare ribbons. These results can be explained with the assumption that the observed p…
Hubble Space Telescope STIS Spectroscopy of the White Dwarfs in the Ultrashort-Period Dwarf Novae VY Aquarii and WX Ceti
Szkody, Paula; Howell, Steve B.; Sion, Edward M. +2 more
We present the results of a multicomponent synthetic spectral analysis of Hubble Space Telescope (HST) STIS spectra of the ultrashort-period dwarf novae VY Aqr and WX Ceti during their deep quiescence following their last superoutburst. The white dwarf in these extremely low accretion rate systems dominates the far-UV light. We find that the accre…
Ab initio Wavelengths and Oscillator Strengths for Cl X
Karpuškienė, R.; Bogdanovich, P.; Martinson, I.
Using the configuration interaction technique, the energy spectra of 2s22p4, 2s2p5, 2s22p33s, 2s22p33p, and 2s22p33d configurations of oxygen-like chlorine Cl X have been calculated. The obtained data are used for the evaluation of wavelengths and oscillator strengths of all possible one-electron and two-electron 2s22p33p-2s2p5 electric dipole tra…
RX J0042.3+4115: A stellar mass black hole binary identified in M 31
Kolb, U.; Borozdin, K. N.; Osborne, J. P. +1 more
Four XMM-Newton X-ray observations of the central region of the
Heating the magnetically open ambient background corona of the Sun by Alfvén waves
Peter, H.; Vocks, C.
Observations of UVCS/SOHO of very high emission line widths in the outer corona suggest that the open field regions there are heated by ion-cyclotron resonance absorption of Alfvén waves resulting in the ions being much hotter than the electrons. In the lower corona it is usually assumed that the effective Coulomb-interactions ensure equal tempera…
Spectroscopic Identification of White Dwarfs in the New Luyten Two-Tenths Survey
Vennes, Stéphane; Kawka, Adela
We spectroscopically identify New Luyten Two-Tenths (NLTT) stars from the reduced proper-motion diagram of Salim & Gould. Five out of 16 objects investigated are identified as white dwarfs: four hydrogen-rich DA stars (NLTT 8581, NLTT 31748, NLTT 53177, and NLTT 56805) and one helium-rich (NLTT 8435). The properties of the stars are further co…
Heliospheric ``FALTS'': Favored Acceleration Locations at the Termination Shock
McComas, D. J.; Schwadron, N. A.
The standard explanation for Anomalous Cosmic Rays requires strong energization at the heliospheric termination shock. However, the tightly wrapped magnetic spiral in the outer heliosphere produces a quasi-perpendicular shock where it is difficult to accelerate low energy particles. We show that motion of footpoints between regions of fast and slo…