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Semi-empirical Modeling of the Photosphere, Chromosphere, Transition Region, and Corona of the M-dwarf Host Star GJ 832
France, Kevin; Fontenla, J. M.; Walkowicz, Lucianne M. +5 more
Stellar radiation from X-rays to the visible provides the energy that controls the photochemistry and mass loss from exoplanet atmospheres. The important extreme ultraviolet (EUV) region (10-91.2 nm) is inaccessible and should be computed from a reliable stellar model. It is essential to understand the formation regions and physical processes resp…
Evidence for Periodicity in 43 year-long Monitoring of NGC 5548
Zucker, S.; Bon, E.; Netzer, H. +14 more
We present an analysis of 43 years (1972 to 2015) of spectroscopic observations of the Seyfert 1 galaxy NGC 5548. This includes 12 years of new unpublished observations (2003 to 2015). We compiled about 1600 Hβ spectra and analyzed the long-term spectral variations of the 5100 Å continuum and the Hβ line. Our analysis is based on standard procedur…
The global surface composition of 67P/CG nucleus by Rosetta/VIRTIS. (I) Prelanding mission phase
Longobardo, Andrea; Palomba, Ernesto; Piccioni, Giuseppe +27 more
From August to November 2014 the Rosetta orbiter has performed an extensive observation campaign aimed at the characterization of 67P/CG nucleus properties and to the selection of the Philae landing site. The campaign led to the production of a global map of the illuminated portion of 67P/CG nucleus. During this prelanding phase the comet's helioc…
Chemical differentiation in a prestellar core traces non-uniform illumination
Caselli, P.; Spezzano, S.; Harju, J. +2 more
Dense cloud cores present chemical differentiation because C- and N-bearing molecules are distributed differently, the latter being less affected by freeze-out onto dust grains. In this letter we show that two C-bearing molecules, CH3OH and c-C3H2, present a strikingly different (complementary) morphology while sho…
Observations of an aeolian landscape: From surface to orbit in Gale Crater
Day, Mackenzie; Kocurek, Gary
Landscapes derived solely from aeolian processes are rare on Earth because of the dominance of subaqueous processes. In contrast, aeolian-derived landscapes should typify Mars because of the absence of liquid water, the long exposure times of surfaces, and the presence of wind as the default geomorphic agent. Using the full range of available orbi…
Star Formation Black Hole Growth and Dusty Tori in the Most Luminous AGNs at z=2-3.5
Lani, Caterina; Trakhtenbrot, Benny; Netzer, Hagai +3 more
We report Herschel/SPIRE observations of 100 very luminous, optically selected active galactic nuclei (AGNs) at z=2{--}3.5 with {log} {L}{{1350}} (erg s-1) ≥ 46.5 , where {L}{{1350}} is λLλ at 1350 Å. The distribution in {L}{{1350}} is similar to the general distribution of Sloan Digital Sky S…
The Complex Structure of Magnetic Field Discontinuities in the Turbulent Solar Wind
Perri, S.; Veltri, P.; Yordanova, E. +2 more
Using high-resolution Cluster satellite observations and a multi-dimensional intermittency technique, we show that the magnetic discontinuities in the turbulent solar wind are connected through the spatial scales, going from proton down to electron scales. In some circumstances, their structure resembles the Harris equilibrium profile in plasmas. …
Deep MUSE observations in the HDFS. Morpho-kinematics of distant star-forming galaxies down to 108M⊙
Inami, H.; Richard, J.; Bouché, N. +20 more
Aims: Whereas the evolution of gas kinematics of massive galaxies is now relatively well established up to redshift z ~ 3, little is known about the kinematics of lower mass (M⋆≤ 1010M⊙) galaxies. We use MUSE, a powerful wide-field, optical integral-field spectrograph (IFS) recently mounted on the VLT, to char…
X-ray spectral properties of the AGN sample in the northern XMM-XXL field
Shen, Yue; Nandra, Kirpal; Streblyanska, Alina +7 more
In this paper we describe and publicly release a catalogue consisting of 8445 point-like X-ray sources detected in the XMM-XXL north survey. For the 2512 AGN which have reliable spectroscopy from SDSS-III/BOSS, we present the X-ray spectral fitting which has been computed with a Bayesian approach. We have also applied an X-ray spectral stacking me…
Baryon cycling in the low-redshift circumgalactic medium: a comparison of simulations to the COS-Halos survey
Kollmeier, Juna A.; Davé, Romeel; Tumlinson, Jason +8 more
We analyse the low-redshift (z ≈ 0.2) circumgalactic medium (CGM) by comparing absorption-line data from the COS-Halos survey to absorption around a matched galaxy sample from two cosmological hydrodynamic simulations. The models include different prescriptions for galactic outflows, namely hybrid energy/momentum driven wind (ezw), and constant wi…