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High-resolution Dione atlas derived from Cassini-ISS images
Scholten, F.; Matz, K. -D.; Neukum, G. +7 more
The Cassini imaging science subsystem (ISS) acquired 449 high-resolution images (<800 m/pixel) during one close flyby of Dione in 2005 and three non-targeted flybys in 2004, 2006, and 2007. We combined these images with lower-resolution Cassini images and one other taken by Voyager cameras to produce a high-resolution semi-controlled mosaic of …
Understanding the Relations between QSOs and Their Host Galaxies from Combined HST Imaging and VLT Spectroscopy
Magain, P.; Courbin, F.; Hutsemékers, D. +2 more
The host galaxies of six nearby QSOs are studied on the basis of high-resolution HST optical images and spatially resolved VLT slit spectra. The gas ionization and velocity are mapped as a function of the distance to the central QSO. In the majority of the cases, the QSO significantly contributes to the gas ionization in its whole host galaxy, and…
Heavy absorption and soft X-ray emission lines in the XMM-Newton spectrum of the type 2 radio-loud quasar 3C 234
Fiore, F.; Bianchi, S.; Guainazzi, M. +4 more
Aims:We report results on a 40 ks XMM-Newton observation of the type 2 quasar 3C 234. Optical spectropolarimetric data have demonstrated the presence of a hidden broad-line region in this powerful (MV ≤ -24.2 after reddening and starlight correction) narrow-line FRII radio galaxy. Our analysis is aimed at investigating the X-ray spectra…
A solar burst with a spectral component observed only above 100 GHz during an M class flare
Mandrini, C. H.; Giménez de Castro, C. G.; Cristiani, G. +4 more
Context: Since the installation of submillimeter solar radio telescopes, a new spectral burst component was discovered at frequencies above 100 GHz, creating the THz burst category. In all the reported cases, the events were X-class flares and the THz component was increasing.
Aims: We report for the first time an M class flare that shows a di…
Interstellar Krypton Abundances: The Detection of Kiloparsec-scale Differences in Galactic Nucleosynthetic History
Sofia, Ulysses J.; Meyer, David M.; Cartledge, Stefan I. B. +2 more
We present an analysis of Kr I λ1236 line measurements from 50 sight lines in the Hubble Space Telescope Space Telescope Imaging Spectrograph and Goddard High Resolution Spectrograph data archives that have sufficiently high resolution and signal-to-noise ratio to permit reliable krypton-to-hydrogen abundance ratio determinations. The distribution…
Follow-up observations of binary ultra-cool dwarfs
Martín, E. L.; Huélamo, N.; Bouy, H. +12 more
Context: Astrometric observations of resolved binaries provide estimates of orbital periods and will eventually lead to measurement of dynamical masses. Only a few very low mass star and brown dwarf masses have been measured to date, and the mass-luminosity relation still needs to be calibrated.
Aims: We have monitored 14 very low mass multipl…
Discovery of ultra-compact nuclear rings in three spiral galaxies
Knapen, J. H.; Comerón, S.; Beckman, J. E. +1 more
Ring-shaped morphologies of nuclear star-forming regions within the central 40{-}200 pc of disk galaxies have been barely resolved so far in three composite Sy 2 nuclei, the Sy 2 Circinus galaxy and in three non-AGN galaxies. Such morphologies resemble those of the standard 1 kpc-size nuclear rings that lie in the inner Lindblad resonance regions …
Recent Developments in Local Helioseismology
Thompson, M. J.; Zharkov, S.
Local helioseismology is providing new views of subphotospheric flows from supergranulation to global-scale meridional circulation and for studying structures and dynamics in the quiet Sun and active regions. In this short review we focus on recent developments, and in particular on a number of current issues, including the sensitivity of differen…
Spatially Resolved Spectroscopy of Coma Cluster Early-Type Galaxies. IV. Completing the Data Set
Saglia, R. P.; Thomas, D.; Thomas, J. +3 more
The long-slit spectra obtained along the minor axis, offset major axis, and diagonal axis are presented for 12 E and S0 galaxies of the Coma Cluster drawn from a magnitude-limited sample studied before. The rotation curves, velocity dispersion profiles, and the H3 and H4 coefficients of the Hermite decomposition of the line-o…
MHD simulations of the global solar corona around the Halloween event in 2003 using the synchronic frame format of the solar photospheric magnetic field
Liu, Yang; Hayashi, Keiji; Zhao, Xue Pu
We performed two time-relaxation magnetohydrodynamics (MHD) simulations of the solar corona: one uses the boundary map representing the solar surface magnetic field distribution before the Halloween event in 2003, and the other uses map representing the postevent distribution. The aims of this study are to test a new concept of a solar surface mag…