Search Publications
Deconvolution of Images from BLAST 2005: Insight into the K3-50 and IC 5146 Star-forming Regions
France, Kevin; Devlin, Mark J.; Halpern, Mark +26 more
We present an implementation of the iterative flux-conserving Lucy-Richardson (L-R) deconvolution method of image restoration for maps produced by the Balloon-borne Large Aperture Submillimeter Telescope (BLAST). Compared to the direct Fourier transform method of deconvolution, the L-R operation restores images with better-controlled background no…
INTEGRAL observations of the GeV blazar PKS 1502+106 and the hard X-ray bright Seyfert galaxy Mkn 841
Maraschi, L.; Tagliaferri, G.; Ghisellini, G. +15 more
Context. Extragalactic nuclear activity is most effectively explored with observations at high energies, where the most extreme flux and spectral variations are expected to occur, because of changes in either the accretion flow or the kinematics of the plasma. In active galactic nuclei of blazar type, these variations are the most dramatic.
A…
Extinction law in ultraluminous infrared galaxies at z∼ 1
Kawara, K.; Shimizu, T.; Nozawa, T. +3 more
We analyse the multiwavelength photometric and spectroscopic data of 12 ultraluminous infrared galaxies (ULIRGs) at z∼ 1 and compare them with models of stars and dust in order to study the extinction law and star formation in young infrared (IR) galaxies. Five extinction curves, namely the Milky Way (MW), the pseudo-MW which is MW-like without th…
Harmakhis Vallis Source Region, Mars: Insights into the recent geothermal history based on geological mapping
Komatsu, Goro; Marinangeli, Lucia; Glamoclija, Mihaela
The mapped area of Harmakhis Vallis, at the eastern Hellas Planitia region (35°30-42°50'S; 91°00-97°30'E), covers the surface area of about 212,000 km 2. The region displays an enhanced modification of the initial topography formed by the Hellas impact. The long and complex history of degradation and alteration involves mass-wasting pro…
A current sheet traced from the Sun to interplanetary space
Zhao, H.; Wang, J. X.; Wheatland, M. S. +2 more
Context. Magnetic reconnection is a central concept for understanding solar activity, including filament eruptions, flares, and coronal mass ejections (CMEs). The existence of transverse and vertical current sheets, sites where reconnection takes place in the solar atmosphere, is frequently proposed as a precondition for flare/CME models, but is r…
Oxidizing Proto-atmosphere on Titan: Constraint from N2 Formation by Impact Shock
Mousis, Olivier; Sekine, Yasuhito; Matsui, Takafumi +1 more
Titan is the only satellite that possesses a thick atmosphere, composed mainly of N2 and CH4. However, its origin and evolution remain largely unknown. Knowledge of the acquirement of a N2 atmosphere on Titan would provide insights into nitrogen evolution in planetary atmospheres as well as the formation of satelli…
NSV 11154 Is a New R Coronae Borealis Star
Welch, D. L.; Grindlay, J. E.; Clayton, Geoffrey C. +7 more
NSV 11154 has been confirmed as a new member of the rare hydrogen-deficient R Coronae Borealis (RCB) stars based on new photometric and spectroscopic data. Using new photometry, as well as archival plates from the Harvard archive, we have constructed the historical light curve of NSV 11154 from 1896 to the present. The light curve shows the sudden…
Are small-scale substructures a universal property of galaxy haloes? The case of the giant elliptical NGC 5128
Rejkuba, M.; Mouhcine, M.; Ibata, R.
We present an analysis of the spatial and chemical substructures in a remote halo field in the nearby giant elliptical galaxy Centaurus A (NGC 5128), situated ∼38 kpc from the centre of the galaxy. The observations were taken with the Advanced Camera for Surveys instrument on-board the Hubble Space Telescope, and reach down to the horizontal branc…
Magnetopause response to variations in the solar wind: Conjunction observations between Cluster, TC-1, and SuperDARN
Dandouras, I.; Lucek, E.; Liu, Z. X. +5 more
How the solar wind affects the location of the magnetopause has been widely studied and excellent models of the magnetopause based on in situ observations in the solar wind and at the magnetopause have been established, while the careful insight into the responses of the magnetopause to the variations in the solar wind can still provide us some ne…
Near-Infrared and X-Ray Observations of XSS J12270-4859
Ishida, Manabu; Gandhi, Poshak; Tsujimoto, Masahiro +5 more
XSS J12270