Search Publications
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…
A solar-like magnetic cycle on the mature K-dwarf 61 Cygni A (HD 201091)
Reiners, A.; Donati, J. -F.; Petit, P. +9 more
Context. The long-term monitoring of magnetic cycles in cool stars is a key diagnostic in understanding how dynamo generation and amplification of magnetic fields occur in stars similar in structure to the Sun.
Aims: We investigated the temporal evolution of a possible magnetic cycle of 61 Cyg A. The magnetic cycle is determined from 61 Cyg A…
HerMES: a search for high-redshift dusty galaxies in the HerMES Large Mode Survey - catalogue, number counts and early results
Pérez-Fournon, I.; Ivison, R. J.; Clements, D. L. +25 more
Selecting sources with rising flux densities towards longer wavelengths from Herschel/Spectral and Photometric Imaging Receiver (SPIRE) maps is an efficient way to produce a catalogue rich in high-redshift (z > 4) dusty star-forming galaxies. The effectiveness of this approach has already been confirmed by spectroscopic follow-up observations, …
Azimuthal asymmetries in the debris disk around HD 61005. A massive collision of planetesimals?
Rouan, D.; Pinte, C.; Quanz, S. P. +30 more
Context. Debris disks offer valuable insights into the latest stages of circumstellar disk evolution, and can possibly help us to trace the outcomes of planetary formation processes. In the age range 10 to 100 Myr, most of the gas is expected to have been removed from the system, giant planets (if any) must have already been formed, and the format…
Solar Cycle 25: Another Moderate Cycle?
Schüssler, M.; Jiang, J.; Cameron, R. H.
Surface flux transport simulations for the descending phase of Cycle 24 using random sources (emerging bipolar magnetic regions) with empirically determined scatter of their properties provide a prediction of the axial dipole moment during the upcoming activity minimum together with a realistic uncertainty range. The expectation value for the dipo…