Search Publications
Implications of the radio spectral index transition in LS I +61°303 for its INTEGRAL data analysis
Zimmermann, L.; Massi, M.
Context. The TeV emitting X-ray binary LS I +61°303 has two radio periodicities that correspond to a large periodic outburst with the same period as the orbit, 26.5 days (phase Φ), and a second periodicity of 1667 days (phase Θ), which modulates the orbital phase and amplitude of the large outburst. Analyses of the radio spectral index revealed in…
Mid-IR FORCAST/SOFIA Observations of M82
Gull, G. E.; Schoenwald, J.; Morris, M. R. +9 more
We present 75'' × 75'' size maps of M82 at 6.4 µm, 6.6 µm, 7.7 µm, 31.5 µm, and 37.1 µm with a resolution of ~4'' that we have obtained with the mid-IR camera FORCAST on SOFIA. We find strong emission from the inner 60'' (~1 kpc) along the major axis, with the main peak 5'' west-southwest of the nucleus and a secondar…
Cassini capturing of freshly-produced water-group ions in the Enceladus torus
Yaroshenko, V. V.; Miloch, W. J.; Thomas, H. M. +1 more
The water vapor plume on the geological-active south-polar region of the moon Enceladus is recognized as the main source of Saturn's neutral torus centered on the Enceladus orbit. The composition of the torus is dominated by water group species. Recent in situ Cassini plasma spectrometer measurements indicate the existence of freshly produced, slo…
Polarization and direction of arrival of Jovian quasiperiodic bursts observed by Cassini
Cecconi, B.; Kimura, T.; Misawa, H. +4 more
Jovian quasiperiodic (QP) radio bursts are suspected to be associated with relativistic particle accelerations occurring with a quasiperiodicity between a few minutes and a few tens of minutes in Jupiter's polar magnetosphere. Understanding the excitation and propagation of QP bursts could help us to better understand this periodic energization pr…
Statistical Study of Solar Wind Parameters and Evolution of Dst Variations during 19-23 Solar Cycles in Relation with Cosmic Ray Variations
Biktash, L.
We have studied the long-term variations of equatorial Dst index in 19-23 solar cycles to display favorable conditions in interplanetary space, which can have an influence on cosmic ray variation and climate change. In this connection the solar wind and interplanetary magnetic field parameters obtained from the OMNI and Ulysses databases, geomagne…
Four Decades of IRC +10216: Evolution of a Carbon-rich Dust Shell Resolved at 10 µm with MMT Adaptive Optics and MIRAC4
Marengo, Massimo; Hoffmann, William F.; Close, Laird M. +3 more
The evolved carbon-rich asymptotic giant branch star IRC +10216 (CW Leo) is the brightest mid-infrared source outside the solar system, as well as one of the closest examples of an evolved star losing mass. It has a complex and variable circumstellar structure on small scales in the near-infrared, and mid-infrared interferometry has revealed a dyn…
Variable stars in the globular cluster M 28 (NGC 6626)
Contreras Ramos, R.; Catelan, M.; Alonso-García, J. +3 more
Context. We present a new search for variable stars in the Galactic globular cluster M 28 (NGC 6626).
Aims: The search is based on a series of BVI images obtained with the SMARTS Consortium's 1.3 m telescope at Cerro Tololo Inter-American Observatory, Chile.
Methods: The search was carried out using the ISIS v2.2 image subtraction packag…
Testing spectropolarimetry in the extreme ultraviolet to infer the solar coronal magnetic field
Khan, A.
Context. Spectropolarimetry has the potential to provide us with important coronal plasma parameters.
Aims: We test spectropolarimetric forward modelling by investigating whether it is possible to reproduce the only linear polarisation measurement made for the optically thin 1032 Å UV O vi line detected by the Solar Ultraviolet Measurements o…
EUV Analysis of a Quasi-static Coronal Loop Structure
McKenzie, D. E.; Martens, P. C. H.; Scott, J. T.
Decaying active region 10942 is investigated from 4:00 - 16:00 UT on 24 February 2007 using a suite of EUV observing instruments. Results from Hinode/EIS, STEREO and TRACE show that, although the active region has decayed and no sunspot is present, the physical mechanisms that produce distinguishable loop structures, spectral line broadening, and …
Hubble Space Telescope Pixel Analysis of the Interacting S0 Galaxy NGC 5195 (M51B)
Lee, Jong Chul; Kim, Minjin; Lee, Joon Hyeop +4 more
We report the properties of the interacting S0 galaxy NGC 5195 (M51B), revealed in a pixel analysis using the Hubble Space Telescope/Advanced Camera for Surveys images in the F435W, F555W, and F814W (BVI) bands. We analyze the pixel color-magnitude diagram (pCMD) of NGC 5195, focusing on the properties of its red and blue pixel sequences and the d…