Search Publications
Trapping mechanism of O2 in water ice as first measured by Rosetta spacecraft
Bar-Nun, Akiva; Laufer, Diana; Ninio Greenberg, Adi
One of the most surprising measurements of the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) instrument on the comet 67P/Churyumov-Gerasimenko was the detection of O2 along with N2 and noble gases which were measured for the first time in comets, along with the major constituents, water, CO, and CO2<…
The effect of the environment on the structure, morphology and star formation history of intermediate-redshift galaxies
Schrabback, Tim; Aragón-Salamanca, Alfonso; Milvang-Jensen, Bo +4 more
With the aim of understanding the effect of the environment on the star formation history and morphological transformation of galaxies, we present a detailed analysis of the colour, morphology and internal structure of cluster and field galaxies at 0.4 ≤ z ≤ 0.8. We use the Hubble Space Telescope data for over 500 galaxies from the ESO Distant Clu…
Similarities in element content between comet 67P/Churyumov-Gerasimenko coma dust and selected meteorite samples
Engrand, Cécile; Merouane, Sihane; Paquette, John +8 more
We have analysed the element composition and the context of particles collected within the coma of 67P/Churyumov-Gerasimenko with Rosetta's COmetary Secondary Ion Mass Analyzer (COSIMA). A comparison has been made between on board cometary samples and four meteorite samples measured in the laboratory with the COSIMA reference model. Focusing on th…
Orbital variations in intensity and spectral properties of the highly obscured sgHMXB IGR J16318-4848
Paul, Biswajit; Iyer, Nirmal
IGR J16318-4848 is an X-ray binary with the highest known line-of-sight absorption column density among all known X-ray binary systems in our Galaxy. In order to investigate the reason behind such a large absorption column, we looked at the variations in the X-ray intensity and spectral parameters as a function of the tentatively discovered ∼80 d …
Rosetta Alice/VIRTIS observations of the water vapour UV electroglow emissions around comet 67P/Churyumov-Gerasimenko
Stern, S. A.; Feldman, P. D.; Bertaux, J. -L. +18 more
Several UV emission lines of the coma of 67P/Churyumov-Gerasimenko have been observed by Alice/Rosetta before the 67P/CG perihelion. The H and O emissions are mainly produced by impact dissociation of water molecules by suprathermal electrons. In this paper, we explore further the electron dissociative excitation of H2O to produce the U…
Shutting down or powering up a (U)LIRG? Merger components in distinctly different evolutionary states in IRAS 19115-2124 (the Bird)
Kuncarayakti, Hanindyo; Reunanen, Juha; Mattila, Seppo +5 more
We present new SINFONI near-infrared (NIR) integral field unit (IFU) spectroscopy and Southern African Large Telescope (SALT) optical long-slit spectroscopy characterizing the history of a nearby merging luminous infrared galaxy, dubbed the Bird (IRAS19115-2124). The NIR line-ratio maps of the IFU data cubes and stellar population fitting of the S…
Gemini and Lowell observations of 67P/Churyumov-Gerasimenko during the Rosetta mission
Skiff, Brian A.; Schleicher, David G.; Vincent, Jean-Baptiste +4 more
We present observations of comet 67P/Churyumov-Gerasimenko acquired in support of the Rosetta mission. We obtained usable data on 68 nights from 2014 September until 2016 May, with data acquired regularly whenever the comet was observable. We collected an extensive set of near-IR J, H and Ks data throughout the apparition plus visible-light images…
Dynamical history of a binary cluster: Abell 3653
Hudaverdi, Murat; Caglar, Turgay
We study the dynamical structure of a bimodal galaxy cluster Abell 3653 at z = 0.1089 using optical and X-ray data. Observations include archival data from the Anglo-Australian Telescope, X-ray observatories XMM-Newton and Chandra. We draw a global picture for A3653 using galaxy density, X-ray luminosity and temperature maps. The galaxy distributi…
Short time-scale variables in the Gaia era: detection and characterization by structure function analysis
Wevers, Thomas; Rimoldini, Lorenzo; Mowlavi, Nami +7 more
We investigate the capabilities of the ESA Gaia mission for detecting and characterizing short time-scale variability, from tens of seconds to a dozen hours. We assess the efficiency of the variogram analysis, for both detecting short time-scale variability and estimating the underlying characteristic time-scales from Gaia photometry, through exte…
Wide- and contact-binary formation in substructured young stellar clusters
Moraux, E.; Dorval, J.; Boily, C. M. +1 more
We explore with collisional gravitational N-body models the evolution of binary stars in initially fragmented and globally subvirial clusters of stars. Binaries are inserted in the (initially) clumpy configurations so as to match the observed distributions of the field-binary-stars' semimajor axes a and binary fraction versus primary mass. The dis…