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Broadband X-ray spectral variability of the pulsing ULX NGC 1313 X-2
Cusumano, G.; Fabian, A. C.; Pinto, C. +12 more
Context. It is thought that ultraluminous X-ray sources (ULXs) are mainly powered by super-Eddington accreting neutron stars or black holes as shown by the recent discovery of X-ray pulsations and relativistic winds.
Aims: This work presents a follow-up study of the spectral evolution over two decades of the pulsing ULX NGC 1313 X-2 in order …
A Catalog of Host Galaxies for WISE-selected AGN: Connecting Host Properties with Nuclear Activity and Identifying Contaminants
Stern, Daniel; Comerford, Julia M.; Barrows, R. Scott +1 more
We present a catalog of physical properties for galaxies hosting active galactic nuclei (AGN) detected by the Wide-field Infrared Survey Explorer (WISE). By fitting broadband spectral energy distributions of sources in the WISE AGN Catalog with empirical galaxy and AGN templates, we derive photometric redshifts, AGN bolometric luminosities, measur…
Exploring the radial evolution of interplanetary coronal mass ejections using EUHFORIA
Zhukov, A. N.; Rodriguez, L.; Poedts, S. +2 more
Context. Coronal mass ejections (CMEs) are large-scale eruptions coming from the Sun and transiting into interplanetary space. While it is widely known that they are major drivers of space weather, further knowledge of CME properties in the inner heliosphere is limited by the scarcity of observations at heliocentric distances other than 1 au. In a…
Measuring the Magnetic Origins of Solar Flares, Coronal Mass Ejections, and Space Weather
Rempel, Matthias; de Toma, Giuliana; Ezzeddine, Rana +12 more
We take a broad look at the problem of identifying the magnetic solar causes of space weather. With the lackluster performance of extrapolations based upon magnetic field measurements in the photosphere, we identify a region in the near-UV (NUV) part of the spectrum as optimal for studying the development of magnetic free energy over active region…
The effects of the initial mass function on Galactic chemical enrichment
Lapi, A.; Bressan, A.; Grisoni, V. +7 more
Context. We have been seeing mounting evidence that the stellar initial mass function (IMF) might extend far beyond the canonical Mi ∼ 100 M⊙ limit, but the impact of such a hypothesis on the chemical enrichment of galaxies is yet to be clarified.
Aims: We aim to address this question by analysing the observed abundances…
Metallicities from high-resolution spectra of 49 RR Lyrae variables
Dall'Ora, Massimo; Bono, Giuseppe; Fiorentino, Giuliana +12 more
Accurate metallicities of RR Lyrae are extremely important in constraining period-luminosity-metallicity (PLZ) relationships, particularly in the near-infrared. We analyse 69 high-resolution spectra of Galactic RR Lyrae stars from the Southern African Large Telescope. We measure metallicities of 58 of these RR Lyrae stars with typical uncertaintie…
Primordial Black Holes Formation and Secondary Gravitational Waves in Nonminimal Derivative Coupling Inflation
Karami, Kayoomars; Teimoori, Zeinab; Rezazadeh, Kazem
We study the possibility of the primordial black holes (PBHs) formation with the aim of finding a considerable fraction of dark matter (DM), using the gravitationally enhanced friction mechanism which arises from a nonminimal derivative coupling between the scalar field and the gravity. Assuming the nonminimal coupling parameter as a special funct…
Far-UV and Optical Emissions from Three Very Large Supernova Remnants Located at Unusually High Galactic Latitudes
Raymond, John C.; Milisavljevic, Dan; Fesen, Robert A. +9 more
Galactic supernova remnants (SNRs) with angular dimensions greater than a few degrees are relatively rare, as are remnants located more than 10° off the Galactic plane. Here we report a UV and optical investigation of two previously suspected SNRs more than 10° in both angular diameter and Galactic latitude. One is a proposed remnant discovered in…
Simulating the infrared sky with a SPRITZ
Pozzi, F.; Rodighiero, G.; Feltre, A. +6 more
Aims: Current hydrodynamical and semi-empirical simulations of galaxy formation and evolution have difficulties in reproducing the number densities of infrared-detected galaxies. Therefore, a phenomenological simulation tool that is new and versatile is necessary to reproduce current and predict future observations at infrared (IR) wavelength…
Characterization of 92 southern TESS candidate planet hosts and a new photometric [Fe/H] relation for cool dwarfs
Nordlander, Thomas; Casagrande, Luca; Žerjal, Maruša +7 more
We present the results of a medium-resolution optical spectroscopic survey of 92 cool ($3000 \,\mathrm{ K}\lesssim T_{\rm eff} \lesssim 4500\,$K) southern TESS candidate planet hosts, and describe our spectral fitting methodology used to recover stellar parameters. We quantify model deficiencies at predicting optical fluxes, and while our techniqu…