Search Publications
Count-based imaging model for the Spectrometer/Telescope for Imaging X-rays (STIX) in Solar Orbiter
Massa, Paolo; Piana, Michele; Benvenuto, Federico +1 more
The Spectrometer/Telescope for Imaging X-rays (STIX) will study solar flares across the hard X-ray window provided by the Solar Orbiter cluster. Similarly to the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), STIX is a visibility-based imaging instrument that will require Fourier-based image reconstruction methods. However, in this…
Dust emissivity and absorption cross section in DustPedia late-type galaxies
Bianchi, S.; Madden, S. C.; Galliano, F. +16 more
Aims: We compare the far-infrared to sub-millimetre dust emission properties measured in high Galactic latitude cirrus with those determined in a sample of 204 late-type DustPedia galaxies. The aim is to verify if it is appropriate to use Milky Way dust properties to derive dust masses in external galaxies.
Methods: We used Herschel obse…
IFU investigation of possible Lyman continuum escape from Mrk 71/NGC 2366
Östlin, Göran; Roth, Martin M.; Micheva, Genoveva +2 more
Context. Mrk 71/NGC 2366 is the closest green pea (GP) analog and candidate Lyman Continuum (LyC) emitter. Recently, 11 LyC-leaking GPs have been detected through direct observations of the ionizing continuum, making this the most abundant class of confirmed LyC-emitters at any redshift. High resolution, multiwavelength studies of GPs can lead to …
CHANG-ES. XIV. Cosmic-ray propagation and magnetic field strengths in the radio halo of NGC 4631
Beck, Rainer; Kamieneski, Patrick; Irwin, Judith +13 more
Aims: NGC 4631 is an interacting galaxy that exhibits one of the largest, gaseous halos observed among edge-on galaxies. We aim to examine the synchrotron and cosmic-ray propagation properties of its disk and halo emission with new radio continuum data.
Methods: Radio continuum observations of NGC 4631 were performed with the Karl G. Jan…
Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292
Alonso, R.; Deeg, H.; Erikson, A. +51 more
We present the discovery and characterization of a new transiting planet from Campaign 17 of the Kepler extended mission K2. The planet K2-292 b is a warm sub-Neptune on a 17 day orbit around a bright (V = 9.9 mag) solar-like G3 V star with a mass and radius of M⋆ = 1.00 ± 0.03 M⊙ and R⋆ = 1.09 ± 0.03 R⊙…
The tilt of the velocity ellipsoid in the Milky Way with Gaia DR2
Helmi, A.; de Zeeuw, P. T.; Posti, L. +1 more
The velocity distribution of stars is a sensitive probe of the gravitational potential of the Galaxy, and hence of its dark matter distribution. In particular, the shape of the dark halo (e.g. spherical, oblate, or prolate) determines velocity correlations, and different halo geometries are expected to result in measurable differences. Here we exp…
Inversion of asteroid photometry from Gaia DR2 and the Lowell Observatory photometric database
Hanuš, J.; Ďurech, J.; Vančo, R.
Context. Rotation properties (spin-axis direction and rotation period) and coarse shape models of asteroids can be reconstructed from their disk-integrated brightness when measured from various viewing geometries. These physical properties are essential for creating a global picture of structure and dynamical evolution of the main belt.
Aims:…
The complex case of MACS J0717.5+3745 and its extended filament: intra-cluster light, galaxy luminosity function, and galaxy orientations
Adami, C.; Martinet, N.; Durret, F. +3 more
Context. The properties of galaxies are known to be affected by their environment, but although galaxies in clusters and groups have been quite thoroughly investigated, little is known about galaxies belonging to filaments of the cosmic web, or about the properties of the filaments themselves.
Aims: Here we investigate the properties of the r…
How the power spectrum of dust continuum images may hide the presence of a characteristic filament width
Miville-Deschênes, M. -A.; André, Ph.; Arzoumanian, D. +6 more
Context. Herschel observations of interstellar clouds support a paradigm for star formation in which molecular filaments play a central role. One of the foundations of this paradigm is the finding, based on detailed studies of the transverse column density profiles observed with Herschel, that nearby molecular filaments share a common inner width …
Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system
Henning, Thomas; Nakagawa, Takao; Currie, Thayne +24 more
We present SCExAO/CHARIS 1.1-2.4 µm integral field direct spectroscopy of the young HIP 79124 triple system. HIP 79124 is a member of the Scorpius-Centaurus association, consisting of an A0V primary with two low-mass companions at a projected separation of < 1″. Thanks to the high quality wavefront corrections provided by SCExAO, both com…