Search Publications
Characterizing the Radio-X-ray Connection in GRS 1915+105
Rodriguez, J.; Pooley, G. G.; Prat, L.
We analyzed radio and X-ray observations of GRS 1915+105, between 1995 May and 2006 June, focusing on the times characterized by radio flares and cycles of hard dips—soft spikes in the X-ray light curve. Assuming these flares to be discrete ejections, we applied a plasmon model to the radio data, with good agreement with the light curves. We fitte…
The far-ultraviolet albedo of Šteins measured with Rosetta-ALICE
Parker, Joel Wm.; Bertaux, Jean-Loup; Weaver, Harold A. +9 more
During Rosetta's flyby of the asteroid (2867) Šteins in 2008, we used the ALICE instrument to measure the first far-ultraviolet (FUV) reflectivity spectrum of an asteroid (850-2000 Å). It is very dark in the FUV, ∼4%, compared to its very high reflectivity (40%) at optical wavelengths. The FUV albedo does not exhibit a systematic color trend acros…
On the relationship between coronal heating, magnetic flux, and the density of the solar wind
McComas, D. J.; Schwadron, N. A.; Riley, Pete +3 more
The stark differences between the current solar minimum and the previous one offer a unique opportunity to develop new constraints on mechanisms for heating and acceleration of the solar wind. We have used a combination of numerical simulations and analysis of remote solar and in situ observations to infer that the coronal heating rate, H, scales …
Impact of Coherent Backscattering on the Spectra of Icy Satellites of Saturn and the Implications of Its Effects for Remote Sensing
Buratti, B.; Kolokolova, L.; Tishkovets, V.
We have found systematic variations in the spectra of Saturn's icy satellites Rhea and Iapetus obtained by the Cassini Visual and Infrared Mapping Spectrometer (VIMS). The main attribute of these variations is a significantly different depth of the absorption bands at different phase angles. We show that these variations likely result from the coh…
A Limit on the Number of Isolated Neutron Stars Detected in the ROSAT All-Sky-Survey Bright Source Catalog
Fox, Derek B.; Rutledge, Robert E.; Turner, Monica L. +2 more
Using new and archival observations made with the Swift satellite and other facilities, we examine 147 X-ray sources selected from the ROSAT All-Sky-Survey Bright Source Catalog (RASS/BSC) to produce a new limit on the number of isolated neutron stars (INSs) in the RASS/BSC, the most constraining such limit to date. Independent of X-ray spectrum a…
Measurements of stray antenna capacitance in the STEREO/WAVES instrument: Comparison of the measured voltage spectrum with an antenna electron shot noise model
Eastwood, J. P.; Maksimovic, M.; Bale, S. D. +6 more
One of the most accurate techniques for in situ measuring the electron density and temperature in space plasmas is the quasi-thermal noise spectroscopy, which uses the voltage fluctuation spectrum on an electric antenna. This technique has been used successfully on the WIND and ULYSSES spacecraft; however, on STEREO this technique may only work in…
Aerosols in Titan's Atmosphere
West, Robert A.; Tomasko, Martin G.
Aerosols in Titan's atmosphere play important roles in the transfer of solar and thermal radiation, in Titan's heat balance, in forcing atmospheric dynamics, and as a sink for photochemical reactions. In this chapter we briefly summarize the history of our knowledge of their distribution and optical properties before concentrating in greater detai…
Anti-correlated Soft Lags in the Intermediate State of Black Hole Source GX 339-4
Rao, A. R.; Sriram, K.; Choi, C. S.
We report the few hundred second anti-correlated soft lags between soft and hard energy bands in the source GX 339-4 using RXTE observations. In one observation, anti-correlated soft lags were observed using the ISGRI/INTEGRAL hard energy band and the PCA/RXTE soft energy band light curves. The lags were observed when the source was in hard and so…
The non-evolving internal structure of early-type galaxies: the case study SDSSJ0728+3835 at z = 0.206
Treu, Tommaso; Gavazzi, Raphaël; Auger, Matthew W. +4 more
We study the internal dynamical structure of the early-type lens galaxy SDSSJ0728+3835 at z = 0.206. The analysis is based on two-dimensional kinematic maps extending out to 1.7 effective radii obtained from Keck spectroscopy, on lensing geometry and on stellar mass estimates obtained from multiband Hubble Space Telescope imaging. The data are mod…
XMM-Newton long-look observation of the narrow line Seyfert 1 galaxy PKS 0558-504. I. Spectral analysis
Papadakis, I. E.; Brinkmann, W.; Nicastro, F. +3 more
Context. PKS 0558-504 has been observed repeatedly by XMM-Newton as a calibration and performance verification (PV) target. In this work, we present results from the spectral analysis of a long XMM-Newton observation of the radio loud Narrow Line Seyfert 1 galaxy PKS 0558-504.
Aims: To study the soft excess component in this object, the spect…