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On the connection between the metal-enriched intergalactic medium and galaxies: an O VI-galaxy cross-correlation study at z < 1
Tejos, Nicolas; Morris, Simon L.; Fumagalli, Michele +10 more
We present new results on the auto- and cross-correlation functions of galaxies and O VI absorbers in a ∼18 Gpc3 comoving volume at z < 1. We use a sample of 51 296 galaxies and 140 O VI absorbers in the column density range 13 ≲ log N ≲ 15 to measure two-point correlation functions in the two dimensions transverse and orthogonal to …
An enduring rapidly moving storm as a guide to Saturn's Equatorial jet's complex structure
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +13 more
Saturn has an intense and broad eastward equatorial jet with a complex three-dimensional structure mixed with time variability. The equatorial region experiences strong seasonal insolation variations enhanced by ring shadowing, and three of the six known giant planetary-scale storms have developed in it. These factors make Saturn's equator a natur…
Blue straggler star populations in globular clusters - II. Proper-motion cleaned HST catalogues of BSSs in 38 Galactic GCs
Puzia, Thomas H.; Simunovic, Mirko
We present new blue straggler star (BSS) catalogues in 38 Milky Way globular clusters (GCs) based on multipassband and multi-epoch treasury survey data from the Hubble Space Telescope. We measure precise astrometry and relative proper motions of stars in all target clusters and performed a subsequent cluster membership selection. We study the accu…
Toward a Network of Faint DA White Dwarfs as High-precision Spectrophotometric Standards
Rest, A.; Saha, A.; Stubbs, C. W. +8 more
We present the initial results from a program aimed at establishing a network of hot DA white dwarfs to serve as spectrophotometric standards for present and future wide-field surveys. These stars span the equatorial zone and are faint enough to be conveniently observed throughout the year with large-aperture telescopes. The spectra of these white…
The Relation between [O III]/Hβ and Specific Star Formation Rate in Galaxies at z ∼ 2
van Dokkum, Pieter G.; Franx, Marijn; Leja, Joel +7 more
Recent surveys have identified a seemingly ubiquitous population of galaxies with elevated [O III]/Hβ emission line ratios at z > 1, although the nature of this phenomenon continues to be debated. The [O III]/Hβ line ratio is of interest because it is a main component of the standard diagnostic tools used to differentiate between active galacti…
Star formation towards the southern cometary H II region IRAS 17256-3631
Chandrasekhar, T.; Vig, S.; Ghosh, S. K. +4 more
IRAS 17256-3631 is a southern Galactic massive star-forming region located at a distance of 2 kpc. In this paper, we present a multiwavelength investigation of the embedded cluster, the H II region, as well as the parent cloud. Radio images at 325, 610 and 1372 MHz were obtained using Giant Metrewave Radio Telescope, India while the near-infrared …
Updated galactic radio constraints on Dark Matter
Cirelli, Marco; Taoso, Marco
We perform a detailed analysis of the synchrotron signals produced by dark matter annihilations and decays. We consider different set-ups for the propagation of electrons and positrons, the galactic magnetic field and dark matter properties. We then confront these signals with radio and microwave maps, including Planck measurements, from a frequen…
Spectroscopic study of the HgMn star HD 49606: the quest for binarity, abundance stratifications and magnetic field
Giarrusso, M.; Leone, F.; Scalia, C. +4 more
In this paper, we present a multi-instrument analysis of the mercury-manganese star HD 49606. New spectroscopic observations have been obtained by us with Catania Astrophysical Observatory Spectropolarimeter (CAOS@OAC) and High Accuracy Radial Velocity Planet Searcher-North@Telescopio Nazionale Galileo (HARPS-N@TNG). Combining these observations w…
Anomalous temporal behaviour of broadband Lyα observations during solar flares from SDO/EVE
Chamberlin, Phillip C.; Milligan, Ryan O.
Although it is the most prominent emission line in the solar spectrum, there has been a notable lack of studies devoted to variations in Lyα emission during solar flares in recent years. However, the few examples that do exist have shown Lyα emission to be a substantial radiator of the total energy budget of solar flares (of the order of 10%). It …
On the Connection between Propagating Solar Coronal Disturbances and Chromospheric Footpoints
De Pontieu, B.; Bryans, P.; McIntosh, S. W. +1 more
The Interface Region Imaging Spectrograph (IRIS) provides an unparalleled opportunity to explore the (thermal) interface between the chromosphere, transition region, and the coronal plasma observed by the Atmospheric Imaging Assembly (AIA) of the Solar Dynamics Observatory (SDO). The SDO/AIA observations of coronal loop footpoints show strong recu…