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INTEGRAL x-ray constraints on sub-GeV dark matter
Pinetti, Elena; Fornengo, Nicolao; Cirelli, Marco +1 more
Light dark matter (DM), defined here as having a mass between 1 MeV and about 1 GeV, is an interesting possibility both theoretically and phenomenologically, at one of the frontiers of current progress in the field of DM searches. Its indirect detection via gamma rays is challenged by the scarcity of experiments in the MeV-GeV region. We look ther…
Star formation and nuclear activity in luminous infrared galaxies: an infrared through radio review
Aalto, Susanne; Alonso-Herrero, Almudena; Mattila, Seppo +2 more
Nearby galaxies offer unique laboratories allowing multi-wavelength spatially resolved studies of the interstellar medium, star formation and nuclear activity across a broad range of physical conditions. In particular, detailed studies of individual local luminous infrared galaxies (LIRGs) are crucial for gaining a better understanding of these pr…
Milky Way Mid-Infrared Spitzer Spectroscopic Extinction Curves: Continuum and Silicate Features
Gordon, Karl D.; Hines, Dean C.; Bouwman, Jeroen +7 more
We measured the mid-infrared (MIR) extinction using Spitzer photometry and spectroscopy (3.6-37 µm) for a sample of Milky Way sight lines (mostly) having measured ultraviolet extinction curves. We used the pair method to determine the MIR extinction that we then fit with a power law for the continuum and modified Drude profiles for the silic…
TESS Observations of the WASP-121 b Phase Curve
Mikal-Evans, Thomas; Sing, David K.; Kane, Stephen R. +23 more
We study the red-optical photometry of the ultrahot Jupiter WASP-121 b as observed by the Transiting Exoplanet Survey Satellite (TESS) and model its atmosphere through a radiative transfer simulation. Given its short orbital period of ∼1.275 days, inflated state, and bright host star, WASP-121 b is exceptionally favorable for detailed atmospheric …
Multiscale, multiwavelength extraction of sources and filaments using separation of the structural components: getsf
Men'shchikov, A.
High-quality astronomical images delivered by modern ground-based and space observatories demand adequate, reliable software for their analysis and accurate extraction of sources, filaments, and other structures, containing massive amounts of detailed information about the complex physical processes in space. The multiwavelength observations with …
r-Process elements from magnetorotational hypernovae
Schmidt, B. P.; Da Costa, G. S.; Marino, A. F. +11 more
Neutron-star mergers were recently confirmed as sites of rapid-neutron-capture (r-process) nucleosynthesis1-3. However, in Galactic chemical evolution models, neutron-star mergers alone cannot reproduce the observed element abundance patterns of extremely metal-poor stars, which indicates the existence of other sites of r-process nucleo…
CGM2 I: The Extent of the Circumgalactic Medium Traced by Neutral Hydrogen
Tripp, Todd M.; Prochaska, J. Xavier; Tejos, Nicolas +8 more
We present initial results from the Cosmic Origins Spectrograph (COS) and Gemini Mapping the Circumgalactic Medium (CGMCGM ≡ CGM2) survey. The CGM2 survey consists of 1689 galaxies, all with high-quality Gemini-GMOS spectra, within 1 Mpc of 22 z ≲ 1 quasars, all with a signal-to-noise ratio of ∼10 Hubble Space Telescope/COS G…
A New View of the Solar Interface Region from the Interface Region Imaging Spectrograph (IRIS)
Reeves, Katharine K.; Polito, Vanessa; Liu, Wei +11 more
The Interface Region Imaging Spectrograph (IRIS) has been obtaining near- and far-ultraviolet images and spectra of the solar atmosphere since July 2013. IRIS is the highest resolution observatory to provide seamless coverage of spectra and images from the photosphere into the low corona. The unique combination of near- and far-ultraviolet spectra…
A hard X-ray view of luminous and ultra-luminous infrared galaxies in GOALS - I. AGN obscuration along the merger sequence
Sanders, D. B.; Stern, D.; Inami, H. +25 more
The merger of two or more galaxies can enhance the inflow of material from galactic scales into the close environments of active galactic nuclei (AGNs), obscuring and feeding the supermassive black hole (SMBH). Both recent simulations and observations of AGN in mergers have confirmed that mergers are related to strong nuclear obscuration. However,…
Exploring the origin of low-metallicity stars in Milky-Way-like galaxies with the NIHAO-UHD simulations
Buck, Tobias; Sestito, Federico; Navarro, Julio F. +6 more
The kinematics of the most metal-poor stars provide a window into the early formation and accretion history of the Milky Way (MW). Here, we use five high-resolution cosmological zoom-in simulations (∼ 5 × 106 star particles) of MW-like galaxies taken from the NIHAO-UHD project, to investigate the origin of low-metallicity stars ([Fe/H] …