Search Publications
Outflow Structure of the Quiet Sun Corona Probed by Spacecraft Radio Scintillations in Strong Scattering
Pätzold, Martin; Imamura, Takeshi; Ando, Hiroki +11 more
Radio scintillation observations have been unable to probe flow speeds in the low corona where the scattering of radio waves is exceedingly strong. Here we estimate outflow speeds continuously from the vicinity of the Sun to the outer corona (heliocentric distances of 1.5-20.5 solar radii) by applying the strong scattering theory to radio scintill…
Improved Hubble Space Telescope proper motions for Tycho-G and other stars in the remnant of Tycho's Supernova 1572
Filippenko, A. V.; Ruiz-Lapuente, P.; Bedin, L. R. +3 more
With archival and new Hubble Space Telescope observations, we have refined the space-velocity measurements of the stars in the central region of the remnant of Tycho's supernova (SN) 1572, one of the historical Galactic Type Ia supernova remnants (SNRs). We derived a proper motion for Tycho-G of (µαcos δ; µδ)…
GTC spectra of z ≈ 2.3 quasars: comparison with local luminosity analogs
Sulentic, Jack W.; Marziani, Paola; Negrete, C. Alenka +3 more
Context. The advent of 8-10 m class telescopes for the first time makes it possible to compare in detail quasars with similar luminosity and very different redshifts.
Aims: We conducted a search for z-dependent gradients in line-emission diagnostics and derived physical properties by comparing, in a narrow bolometric luminosity range (log L ~…
Modeling the X-Rays from the Central Compact Object PSR J1852+0040 in Kesteven 79: Evidence for a Strongly Magnetized Neutron Star
Bogdanov, Slavko
I present modeling of the X-ray pulsations from the central compact object (CCO) PSR J1852+0040 in the Galactic supernova remnant Kesteven 79. In the context of thermal surface radiation from a rotating neutron star (NS), a conventional polar cap model can reproduce the broad, large-amplitude X-ray pulse only with a "pencil plus fan" beam emission…
Coronal origin of the polarization of the high-energy emission of Cygnus X-1
Chaty, S.; Romero, G. E.; Vieyro, F. L.
Context. Cygnus X-1 is the candidate with the highest probability of containing a black hole among the X-ray binary systems in the Galaxy. It is also by far the most often studied of these objects. Recently, the International Gamma-Ray Astrophysics Laboratory Imager on board the Integral satellite (INTEGRAL/IBIS) detected strong polarization in th…
Morphology of magnetic field in near-Venus magnetotail: Venus express observations
Barabash, S.; Futaana, Y.; Wei, Y. +7 more
Knowledge of the magnetic field morphology in the near-Venus wake is essential to the studies of magnetotail dynamics and the planetary plasma escape. In this study we use the magnetic field measurements made by Venus Express during the period of April 2006 to December 2012 to investigate the global magnetic field morphology in the near-Venus magn…
The central dynamics of M3, M13, and M92: stringent limits on the masses of intermediate-mass black holes
Roth, M. M.; Kamann, S.; Wisotzki, L. +4 more
We used the PMAS integral field spectrograph to obtain large sets of radial velocities in the central regions of three northern Galactic globular clusters:
The flushing of Ligeia: Composition variations across Titan's seas in a simple hydrological model
Lorenz, Ralph D.
We use a simple box model to explore possible differences in the liquid composition of Titan's seas. Major variations in the abundance of involatile ethane, somewhat analogous to salinity in terrestrial waters, arise from the hydrological cycle, which introduces more "fresh" methane rainfall at the highest latitudes in summer. The observed composi…
DYNAMO - II. Coupled stellar and ionized-gas kinematics in two low-redshift clumpy discs
Glazebrook, Karl; Obreschkow, Danail; Abraham, Roberto G. +7 more
We study the spatially resolved stellar kinematics of two star-forming galaxies at z ∼ 0.1 from the larger DYnamics of Newly Assembled Massive Objects (DYNAMO) sample. These galaxies, which have been characterized by high levels of star formation and large ionized-gas velocity dispersions, are considered possible analogues to high-redshift clumpy …
Herschel observations and a model for IRAS 08572+3915: a candidate for the most luminous infrared galaxy in the local (z < 0.2) Universe
Sturm, E.; Clements, D. L.; Cooray, A. +17 more
We present Herschel photometry and spectroscopy, carried out as part of the Herschel ultraluminous infrared galaxy (ULIRG) survey, and a model for the infrared to submillimetre emission of the ULIRG IRAS 08572+3915. This source shows one of the deepest known silicate absorption features and no polycyclic aromatic hydrocarbon emission. The model su…