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Ultraviolet-Optical Pixel Maps of Face-on Spiral Galaxies: Clues for Dynamics and Star Formation Histories
Conselice, Christopher J.; de Grijs, Richard; Windhorst, Rogier A. +8 more
Ultraviolet and optical images of the face-on spiral galaxies NGC 6753 and NGC 6782 reveal regions of strong ongoing star formation that are associated with structures traced by the old stellar populations. We use these images to construct NUV-(NUV-I814) pixel color-magnitude diagrams (pCMDs) that reveal plumes of pixels with strongly v…
Spatial and temporal fluctuations in sunspots derived from MDI data
Solanki, S. K.; Rüedi, I.
The penumbra radiates an energy flux that is 0.75-0.8 times the photospheric value. One mechanism proposed to bring this flux to the surface is interchange convection according to which hot flux tubes rise to the surface, lie horizontally there while they cool and finally sink down again. We search for possible signatures of such a process using t…
Cassini plasma spectrometer measurements of Jovian bow shock structure
Dougherty, Michele K.; Gurnett, Donald A.; Coates, Andrew J. +9 more
The Cassini spacecraft on its way to Saturn flew by Jupiter and crossed its bow shock more than forty times on the dusk-side of the planet, whereas the early missions targeting Jupiter explored the dawnside. Here we report the first results concerning these bow shock crossings, based on the measurements of the Cassini Plasma Spectrometer (CAPS), t…
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