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Fast and accurate evaluation of deep-space galactic cosmic ray fluxes with HelMod-4/CUDA
Gervasi, M.; Rancoita, P. G.; Boschini, M. J. +4 more
The accurate knowledge of cosmic ion fluxes is essential for fundamental physics, deep space missions, and exploration activities in the solar system. In the HelMod-4 model the Parker transport equation is solved using a Monte Carlo approach to evaluate the solar modulation effect on local interstellar spectra of Galactic Cosmic Rays (GCRs). This …
Measuring Fiber Positioning Accuracy and Throughput with Fiber Dithering for the Dark Energy Spectroscopic Instrument
Moustakas, J.; Brooks, D.; Doel, P. +48 more
Highly multiplexed, fiber-fed spectroscopy is enabling surveys of millions of stars and galaxies. The performance of these surveys depends on accurately positioning fibers in the focal plane to capture target light. We describe a technique to measure the positioning accuracy of fibers by dithering fibers slightly around their ideal locations. This…
Hidden cooling flows in elliptical galaxies
Fabian, A. C.; Pinto, C.; Ferland, G. J. +4 more
The radiative cooling time of hot gas in the cool cores of many galaxy clusters and massive elliptical galaxies drops in the centre to below
Tomography of the Solar Corona with the Metis Coronagraph II: Three-Dimensional Reconstructions of the Electron Density and Comparison with Reconstructions Based on LASCO-C2
Susino, Roberto; Romoli, Marco; De Leo, Yara +13 more
We carried out tomographic reconstructions of the three-dimensional distribution of the electron density of the solar corona based on white light polarized brightness (pB) images taken by the Metis coronagraph on board the Solar Orbiter (SolO) mission. We selected three different time intervals during 2022, and further implemented independent sync…
The XMM-Newton Line Emission Analysis Program (X-LEAP). II. The Multiscale Temperature Structures in the Milky Way Hot Gas
Bregman, Joel N.; Liu, Jifeng; Qu, Zhijie +1 more
This paper presents the multiscale temperature structures in the Milky Way (MW) hot gas, as part of the XMM-Newton Line Emission Analysis Program, surveying the O VII, O VIII, and Fe-L band emission features in the XMM-Newton archive. In particular, we define two temperature tracers, I OVIII/I OVII (O87) and I FeL/…
Associating LOFAR Galactic Faraday structures with the warm neutral medium
Boulanger, F.; Jenkins, E. B.; Bracco, A. +4 more
Faraday tomography observations with the Low Frequency Array (LOFAR) have unveiled a remarkable network of structures in polarized synchrotron emission at high Galactic latitudes. The observed correlation between LOFAR structures, dust polarization, and HI emission suggests a connection to the neutral interstellar medium (ISM). We investigated thi…
AuriDESI: mock catalogues for the DESI Milky Way Survey
Miquel, Ramon; Sanchez, Eusebio; Grand, Robert J. J. +31 more
The Dark Energy Spectroscopic Instrument Milky Way Survey (DESI MWS) will explore the assembly history of the Milky Way by characterizing remnants of ancient dwarf galaxy accretion events and improving constraints on the distribution of dark matter in the outer halo. We present mock catalogues that reproduce the selection criteria of MWS and the f…
ViCTORIA project: The LOFAR-MeerKAT view of active galactic nuclei in Virgo cluster early-type galaxies
Boselli, A.; Fossati, M.; Röttgering, H. J. A. +8 more
Context. The evolution of active galactic nuclei (AGNs) is closely connected to their host galaxies and surroundings. Via feedback processes, AGNs can counteract the cooling of the intracluster medium (ICM) and suppress star formation in their host galaxies. Radio observations at low frequencies provide a glimpse into the history of AGN activity. …
Modeling Ionized Gas in the Small Magellanic Cloud: The Wolf–Rayet Nebula N76
Sandstrom, Karin M.; Bolatto, Alberto D.; Indebetouw, Rémy +5 more
We present Cloudy modeling of infrared emission lines in the Wolf–Rayet (WR) nebula N76 caused by one of the most luminous and hottest WR stars in the low metallicity Small Magellanic Cloud. We use spatially resolved mid-infrared Spitzer/InfRared Spectrograph and far-infrared Herschel/PACS spectroscopy to establish the physical conditions of the i…
High speed stars. III. Detailed abundances and binary nature of the extreme speed star GHS143
Bonifacio, P.; Caffau, E.; Spite, M. +8 more
Context. The Gaia satellite has provided the community with three releases containing astrometrical and photometric data as well as by products, such as stellar parameters and variability indicators.
Aims: By selecting in the Gaia database, one can select stars with the requested characteristics, such as high speed. At present any selection i…