Search Publications
Occurrence rate of dipolarization fronts in the plasma sheet: Cluster observations
Plaschke, Ferdinand; Zhang, Tielong; Volwerk, Martin +6 more
We investigate the occurrence rate of dipolarization fronts (DFs) in the plasma sheet by taking full advantage of all four Cluster satellites (C1-4) from years 2001 to 2009. In total, we select 466 joint-observation DF events, in which 318, 282, 254, and 236 DFs are observed by C1, C2, C3, and C4, respectively. Our findings are as follows: (1) the…
Distance determination method of dust particles using Rosetta OSIRIS NAC and WAC data
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +42 more
The ESA Rosetta spacecraft has been tracking its target, the Jupiter-family comet 67P/Churyumov-Gerasimenko, in close vicinity for over two years. It hosts the OSIRIS instruments: the Optical, Spectroscopic, and Infrared Remote Imaging System composed of two cameras, see e.g. Keller et al. (2007). In some imaging sequences dedicated to observe dus…
Low-frequency oscillatory flow signatures and high-speed flows in the Earth's magnetotail
Nilsson, H.; Hamrin, M.; Norqvist, P. +6 more
Using plasma sheet data from Cluster 1 spacecraft from 2001 till 2011, we statistically investigate oscillatory signatures in the plasma bulk flow. These periodic oscillations are compared to high-speed and quiet flows. Periodic oscillations are observed approximately 8% of the time, while high-speed flows and quiet flows are observed around 0.5% …
INRRI-EDM/2016: the first laser retroreflector on the surface of Mars
Marchetti, E.; Flamini, E.; Mugnuolo, R. +18 more
During Summer 2015 the SCF_Lab (Satellite/lunar/GNSS laser ranging/altimetry and cube/microsat Characterization Facilities Laboratory, http://www.lnf.infn.it/esperimenti/etrusco, Team of INFN-LNF, with support by ASI, carried out an intense activity of final design, manufacturing and testing in order to construct, space qualify and finally integra…
Relation between the parameters of dust and of molecular and atomic gas in extragalactic star-forming regions
Smirnova, K. I.; Wiebe, D. S.; Sobolev, A. M. +1 more
The relationships between atomic and molecular hydrogen and dust of various sizes in extragalactic star-forming regions are considered, based on observational data from the Spitzer and Herschel infrared space telescopes, the Very Large Array (atomic hydrogen emission) and IRAM (CO emission). The source sample consists of approximately 300 star-for…
Starburst-driven Superwinds in Quasar Host Galaxies
Haas, Martin; Barthel, Peter; Wilkes, Belinda +1 more
During the past five decades astronomers have been puzzled by the presence of strong absorption features including metal lines, observed in the optical and ultraviolet spectra of quasars, signaling inflowing and outflowing gas winds with relative velocities up to several thousands of km s-1. In particular, the location of these winds—cl…
Imaging Parity-violating Modes in the CMB
Contaldi, Carlo R.
Correlations of polarization components in the coordinate frame are a natural basis for searches of parity-violating modes in the cosmic microwave background. This fact can be exploited to build estimators of parity-violating modes that are local and robust with respect to partial-sky coverage or inhomogeneous weighting. As an example application …
Colour gradients in cluster ellipticals at z ∼ 1.4: the hidden content of the galaxy central regions
Gargiulo, A.; Saracco, P.; De Propris, R. +1 more
We present F775W-F850LP (rest-frame UV - U) and F850LP-F160W (rest-frame U - R) colour gradients for a sample of 17 elliptical galaxies morphologically selected in the cluster XMMU J2235.3-2557 at z = 1.39. We detected significant negative (redder inwards) U - R colour gradients in ∼70 per cent of the galaxies and flat gradients for the remaining …
Cosmological N-body simulations with generic hot dark matter
Brandbyge, Jacob; Hannestad, Steen
We have calculated the non-linear effects of generic fermionic and bosonic hot dark matter components in cosmological N-body simulations. For sub-eV masses, the non-linear power spectrum suppression caused by thermal free-streaming resembles the one seen for massive neutrinos, whereas for masses larger than 1 eV, the non-linear relative suppressio…
Measuring the Sun's motion with stellar streams
Malhan, Khyati; Ibata, Rodrigo A.
We present a method for measuring the Sun's motion using the proper motions of Galactic halo star streams. The method relies on the fact that the motion of the stars perpendicular to a stream from a low-mass progenitor is close to zero when viewed from a non-rotating frame at rest with respect to the Galaxy, and that the deviation from zero is due…