Search Publications
Detection of helicoidal motion in the optical jet of PKS 0521-365
Jiménez-Andrade, E. F.; Falomo, R.; Chavushyan, V. +5 more
The jet activity of active galactic nuclei (AGNs), and its interaction with the interstellar medium, may play a pivotal role in the processes that regulate the growth and star formation of its host galaxy. Observational evidence that pinpoints the conditions of such interaction is paramount to unveil the physical processes involved. We report on t…
Shock-Cloud Interaction in the Solar Corona
Takahashi, Takuya
Flare-associated coronal shock waves sometimes interact with solar prominences, leading to large-amplitude prominence oscillations (LAPOs). Such prominence activation gives us a unique opportunity to track the time evolution of shock-cloud interaction in cosmic plasmas. Although the dynamics of interstellar shock-cloud interaction has been extensi…
Age of the magnetically active WW Psa and TX Psa members of the β Pictoris association
Messina, S.; Petrucci, R.; Jofré, E. +6 more
Context. There are a variety of different techniques available to estimate the ages of pre-main-sequence stars. Components of physical pairs, thanks to their strict coevality and the mass difference, such as the binary system analyzed in this paper, are best suited to test the effectiveness of these different techniques.
Aims: We consider the…
On the attempts to measure water (and other volatiles) directly at the surface of a comet
Sheridan, S.; Wright, I. P.; Barber, S. J. +2 more
The Ptolemy instrument on the Philae lander (of the Rosetta space mission) was able to make measurements of the major volatiles, water, carbon monoxide and carbon dioxide, directly at the surface of comet 67P/Churyumov-Gerasimenko. We give some background to the mission and highlight those instruments that have already given insights into the noti…
A test field for Gaia. Radial velocity catalogue of stars in the South Ecliptic Pole
Meisenheimer, K.; Gosset, E.; Boudreault, S. +25 more
Context. Gaia is a space mission that is currently measuring the five astrometric parameters, as well as spectrophotometry of at least 1 billion stars to G = 20.7 mag with unprecedented precision. The sixth parameter in phase space (I.e., radial velocity) is also measured thanks to medium-resolution spectroscopy that is being obtained for the 150 …
The Discovery and Origin of a Very High-velocity Cloud Toward M33
Peek, J. E. G.; Zheng, Y.; Putman, M. E. +1 more
We report the detection of a largely ionized very high-velocity cloud (VHVC; vLSR∼ -350 km s-1) toward M33 with the Hubble Space Telescope/Cosmic Origin Spectrograph. The VHVC is detected in O I, C II, Si II, and Si III absorption along five sightlines separated by ∼ 0.06-0.4°. On sub-degree scales, the velocities and ionic c…
The IRAS 08589-4714 star-forming region
Gómez, M.; Rubio, M.; Cappa, C. E. +3 more
We present an analysis of the IRAS 08589-4714 star-forming region. This region harbors candidate young stellar objects identified in the WISE and Herschel images using color index criteria and spectral energy distributions (SEDs). The SEDs of some of the infrared sources and the 70 µm radial intensity profile of the brightest source are mode…
Rotational Motion of the Spacecraft Philae During Landing on Comet 67P/Churyumov-Gerasimenko
Baranyai, Tamás; Várkonyi, Péter L.; Balázs, András
Hyperactivity in 103P/Hartley 2: Chunks from the sub-surface in Type IIa jet regions
Belton, Michael J. S.
We analyze the observed radial distribution of column densities of water-ice particulates embedded in the primary jet region (J1) of 103P's inner coma at altitudes between 439 and 1967 m (Protopapa et al., 2014, Icarus 238, 191-204) and determine the speed and acceleration of particles and their mass-flow within the filaments of the jet…
The emission-line regions in the nucleus of NGC 1313 probed with GMOS-IFU: a supergiant/hypergiant candidate and a kinematically cold nucleus
Steiner, J. E.; Menezes, R. B.
NGC 1313 is a bulgeless nearby galaxy, classified as SB(s)d. Its proximity allows high spatial resolution observations. We performed the first detailed analysis of the emission-line properties in the nuclear region of NGC 1313, using an optical data cube obtained with the Gemini Multi-object Spectrograph. We detected four main emitting areas, thre…