Search Publications
The variable absorption in the X-ray spectrum of GRB 190114C
Perna, Rosalba; Campana, Sergio; Lazzati, Davide +2 more
Gamma-ray burst (GRB) 190114C was a bright burst that occurred in the local Universe (z = 0.425). It was the first GRB ever detected at teraelectronvolt (TeV) energies, and this was thanks to MAGIC. We characterize the ambient medium properties of the host galaxy through the study of the absorbing X-ray column density. Using a combination of Swift…
Retrieval of the water ice column and physical properties of water-ice clouds in the martian atmosphere using the OMEGA imaging spectrometer
Bellucci, G.; Forget, F.; Oliva, F. +8 more
Using spectral images recorded by the OMEGA instrument on Mars Express (Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité), we are able to derive physical properties of aerosols in water-ice clouds on Mars for a distribution of pixels over an observed cloud formation. These properties, mean effective radius, reff, and op…
Towards a fully consistent Milky Way disk model. IV. The impact of Gaia DR2 and APOGEE
Just, A.; Sysoliatina, K.
Aims: We present an updated version of the semi-analytic Just-Jahrei (JJ) model of the Galactic disk and constrain its parameters in the Solar neighbourhood.
Methods: The new features of the JJ model include a simple two-component gaseous disk, a star-formation rate (SFR) function of the thick disk that has been extended in time, and a c…
Characterizing the magnetic fields of nearby molecular clouds using submillimeter polarization observations
Soler, J. D.; Fissel, L. M.; Li, Z. -Y. +3 more
Of all the factors that influence star formation, magnetic fields are perhaps the least well understood. The goal of this paper is to characterize the 3D magnetic field properties of nearby molecular clouds through various methods of statistically analysing maps of polarized dust emission. Our study focuses on nine clouds, with data taken from the…
An Extremely Elongated Cloud Over Arsia Mons Volcano on Mars: I. Life Cycle
Gondet, B.; Jaumann, R.; Hueso, R. +12 more
We report a previously unnoticed annually repeating phenomenon consisting of the daily formation of an extremely elongated cloud extending as far as 1,800 km westward from Arsia Mons. It takes place in the solar longitude (Ls) range of ∼220°-320°, around the Southern solstice. We study this Arsia Mons Elongated Cloud (AMEC) using images from diffe…
The Cepheid Distance to the Narrow-line Seyfert 1 Galaxy NGC 4051
Ferrarese, L.; Vestergaard, M.; Peterson, B. M. +15 more
We derive a distance of D = 16.6 ± 0.3 Mpc (µ = 31.10 ± 0.04 mag) to the archetypal narrow-line Seyfert 1 galaxy NGC 4051 based on Cepheid period-luminosity relations and new Hubble Space Telescope multiband imaging. We identify 419 Cepheid candidates and estimate the distance at both optical and near-infrared wavelengths using subsamples of…
Description of turbulent dynamics in the interstellar medium: multifractal-microcanonical analysis. I. Application to Herschel observations of the Musca filament
Schneider, N.; Bontemps, S.; Elia, D. +10 more
Observations of the interstellar medium (ISM) show a complex density and velocity structure, which is in part attributed to turbulence. Consequently, the multifractal formalism should be applied to observation maps of the ISM in order to characterize its turbulent and multiplicative cascade properties. However, the multifractal formalism, even in …
Determination of Planetary Nebulae angular diameters from radio continuum spectral energy distribution modelling
Filipović, M. D.; Galvin, T. J.; Parker, Q. A. +2 more
Powerful new, high-resolution, high-sensitivity, multifrequency, wide-field radio surveys such as the Australian Square Kilometre Array Pathfinder (ASKAP) Evolutionary Map of the Universe are emerging. They will offer fresh opportunities to undertake new determinations of useful parameters for various kinds of extended astrophysical phenomena. Her…
The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. II. The Star-formation History of Andromeda I Derived from Long-period Variables
Javadi, Atefeh; Saremi, Elham; van Loon, Jacco Th. +4 more
An optical monitoring survey in the nearby dwarf galaxies was carried out with the 2.5 m Isaac Newton Telescope. 55 dwarf galaxies and four isolated globular clusters in the Local Group were observed with the Wide Field Camera. The main aims of this survey are to identify the most evolved asymptotic giant branch stars and red supergiants at the en…
Spatially Resolved BPT Mapping of Nearby Seyfert 2 Galaxies
Elvis, Martin; Storchi-Bergmann, Thaisa; Fabbiano, G. +5 more
We present spatially resolved Baldwin-Phillips-Terlevich (BPT) mapping of the extended narrow-line regions (ENLRs) of seven nearby Seyfert 2 galaxies, using Hubble Space Telescope narrowband filter imaging. We construct the BPT diagrams using ≤0"1 resolution emission line images of [O III] λ5007, Hα, [S II] λλ6717, 6731, and Hβ. By mapping these d…