Search Publications
The implications of the H2 variability in Titan's exosphere
Galand, M.; Yelle, R. V.; Cui, J. +2 more
We present in this paper an investigation of the distribution of H2 in Titan's exosphere, based on the measurements made with the Ion Neutral Mass Spectrometer (INMS) onboard Cassini during 32 encounters with the satellite. The observed H2 density in Titan's exosphere shows significant variance from flyby to flyby. However, n…
Warm and Fuzzy: Temperature and Density Analysis of an Fe XV EUV Imaging Spectrometer Loop
Schmelz, J. T.; Pathak, S.; Saar, S. H. +3 more
The Hinode EUV Imaging Spectrometer (EIS) and X-Ray Telescope (XRT) were designed in part to work together. They have the same spatial resolution and cover different but overlapping coronal temperature ranges. These properties make a combined data set ideal for multithermal analysis, where EIS provides the best information on the cooler corona (lo…
Identification of a Population of X-ray-emitting Massive Stars in the Galactic Plane
Drake, Jeremy J.; Chakrabarty, Deepto; Lee, Julia C. +15 more
We present X-ray, infrared, optical, and radio observations of four previously unidentified Galactic plane X-ray sources: AX J163252-4746, AX J184738-0156, AX J144701-5919, and AX J144547-5931. Detection of each source with the Chandra X-ray Observatory has provided sub-arcsecond localizations, which we use to identify bright infrared counterparts…
The Impact of Comet Shoemaker-Levy 9 Sends Ripples Through the Rings of Jupiter
Hedman, Matthew M.; Showalter, Mark R.; Burns, Joseph A.
Jupiter’s main ring shows vertical corrugations reminiscent of those recently detected in the rings of Saturn. The Galileo spacecraft imaged a pair of superimposed ripple patterns in 1996 and again in 2000. These patterns behave as two independent spirals, each winding up at a rate defined by Jupiter’s gravity field. The dominant pattern originate…
Evidence for a resonant cyclotron line in IGR J16493-4348 from the Swift-BAT hard X-ray survey
Cusumano, G.; Robba, N. R.; La Parola, V. +4 more
Context. Resonant absorption cyclotron features are a key diagnostic tool to directly measure the strength of the magnetic field of accreting neutron stars. However, typical values of cyclotron features lie in the high-energy part of the spectrum between 20 keV and 50 keV, where detection is often damped by the low quality statistics of results de…
Suzaku Observations of Three FeLoBAL Quasi-stellar Objects: SDSS J0943+5417, J1352+4239, and J1723+5553
Dai, Xinyu; Leighly, Karen M.; Sivakoff, Gregory R. +2 more
We present Suzaku observations of three iron low-ionization broad absorption line quasars (FeLoBALs). We detect J1723+5553 (3σ) in the observed 2-10 keV band, and constrain its intrinsic N H column density to N H > 6 × 1023 cm-2 by modeling its X-ray hardness ratio. We study the broadband spectral ind…
The global energy balance of Titan
West, Robert A.; Baines, Kevin H.; Nixon, Conor A. +12 more
The global energy budget of planets and their moons is a critical factor to influence the climate change on these objects. Here we report the first measurement of the global emitted power of Titan. Long-term (2004-2010) observations conducted by the Composite Infrared Spectrometer (CIRS) onboard Cassini reveal that the total emitted power by Titan…
Relations estimated at shock discontinuities excited by coronal mass ejections
Eselevich, M. V.; Eselevich, V. G.
An analysis of SOHO/LASCO C3 data shows that there are discontinuities in the radial profiles of the plasma density within limited regions in front of each of ten coronal mass ejections, which represent shocks. The shock velocities in various events reach V ≈ 800-2500 km/s. A comparison of the dependence of the AlfvenicMach number M
Abundance profiles and cool cores in galaxy groups
Finoguenov, Alexis; Ponman, Trevor J.; Rasmussen, Jesper +2 more
Using data from the two-dimensional XMM-Newton Group Survey (2dXGS), we have examined the abundance profile properties of both cool core (CC) and non-cool core (NCC) galaxy groups. The 10 NCC systems in our sample represent a population which to date has been poorly studied in the group regime. Fitting the abundance profiles as a linear function o…
Spectral evolution and polarization of variable structures in the pulsar wind nebula of PSR B0540-69.3
Lundqvist, P.; Olofsson, G.; Shibanov, Yu. A. +4 more
We present high spatial resolution optical imaging and polarization observations of the PSR B0540-69.3 and its highly dynamical pulsar wind nebula (PWN) performed with Hubble Space Telescope, and compare them with X-ray data obtained with the Chandra X-ray Observatory. In particular, we have studied the bright region south-west of the pulsar where…