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Multiphase outflows in post-starburst E+A galaxies - II. A direct connection between the neutral and ionized outflow phases
Netzer, Hagai; Xavier Prochaska, J.; Baron, Dalya +1 more
Post-starburst E+A galaxies are systems that hosted a powerful starburst that was quenched abruptly. Simulations suggest that these systems provide the missing link between major merger ULIRGs and red and dead ellipticals, where AGN feedback is responsible for the expulsion or destruction of the molecular gas. However, many details remain unresolv…
NuSTAR Perspective on High-redshift MeV Blazars
Ajello, M.; Gasparrini, D.; Marchesi, S. +7 more
With bolometric luminosities exceeding 1048 erg s-1, powerful jets, and supermassive black holes at their center, MeV blazars are some of the most extreme sources in the universe. Recently, the Fermi-Large Area Telescope detected five new γ-ray emitting MeV blazars beyond redshift z = 3.1. With the goal of precisely character…
Spectroscopic characterization of the known O-star population in Cygnus OB2. Evidence of multiple star-forming bursts
Lennon, D. J.; Herrero, A.; Comerón, F. +6 more
Context. Cygnus OB2 provides a unique insight into the high-mass stellar content in one of the largest groups of young massive stars in our Galaxy. Although several studies of its massive population have been carried out over the last decades, an extensive spectroscopic study of the whole known O-star population in the association is still lacking…
Binary-induced spiral arms inside the disc cavity of AB Aurigae
Pinte, Christophe; Ribas, Álvaro; Macías, Enrique +5 more
In this work we demonstrate that the inner spiral structure observed in AB Aurigae can be created by a binary star orbiting inside the dust cavity. We find that a companion with a mass-ratio of 0.25, semimajor axis of 40 au, eccentricity of 0.5, and inclination of 90° produces gaseous spirals closely matching the ones observed in 12CO (…
Toward a Direct Measure of the Galactic Acceleration
De Rosa, Robert J.; Huber, Daniel; Rhode, Katherine L. +9 more
High-precision spectrographs can enable not only the discovery of exoplanets, but can also provide a fundamental measurement in Galactic dynamics. Over about 10 year baselines, the expected change in the line-of-sight velocity due to the Galaxy's gravitational field for stars at ∼kiloparsec scale distances above the Galactic midplane is ∼few tens …
Hard X-ray selected giant radio galaxies - II. Morphological evidence of restarted radio activity
Venturi, T.; Dallacasa, D.; Ubertini, P. +10 more
About 6 per cent of radio galaxies (RGs) can reach linear sizes larger than 0.7 Mpc, and are then classified as giant radio galaxies (GRGs). The conditions that make possible the formation of such big structures are still not clear - either core accretion properties or environmental factors. Recent studies have shown that GRGs can be up to four ti…
A thin shell of ionized gas as the explanation for infrared excess among classical Cepheids
Kervella, P.; Domiciano de Souza, A.; Marengo, M. +12 more
Context. The infrared (IR) excess of classical Cepheids is seldom studied and poorly understood despite observational evidence and the potential for its contribution to induce systematics on the period-luminosity (PL) relation used in the calibration of the extragalactic distance scale.
Aims: This study aims to understand the physical origin …
Mapping Outflowing Gas in the Fermi Bubbles: A UV Absorption Survey of the Galactic Nuclear Wind
Jenkins, Edward B.; Savage, Blair D.; Lockman, Felix J. +5 more
Using new ultraviolet (UV) spectra of five background quasars from the Cosmic Origins Spectrograph on the Hubble Space Telescope, we analyze the low-latitude ( $| b| =20^\circ \mbox{--}30^\circ $ ) regions of the Fermi Bubbles, the giant gamma-ray-emitting lobes at the Galactic Center. We combine these data with previous UV and atomic hydrogen (H …
CTCV J2056-3014: An X-Ray-faint Intermediate Polar Harboring an Extremely Fast-spinning White Dwarf
Mukai, K.; Oliveira, A. S.; Rodrigues, C. V. +2 more
We report on XMM-Newton X-ray observations that reveal CTCV J2056-3014 to be an unusual accretion-powered, intermediate polar (IP) system. It is a member of the class of X-ray-faint IPs whose space density remains unconstrained but potentially very high, with Lx,0.3-12 keV of 1.8 × 1031 erg s-1. We discovered a coh…
Radio observations of magnetic cataclysmic variables
Mason, Paul A.; Singh, Kulinder P.; Barrett, Paul +2 more
The NSF's Karl G. Jansky Very Large Array (VLA) is used to observe 122 magnetic cataclysmic variables (MCVs) during three observing semesters (13B, 15A, and 18A). We report radio detections of 33 stars with fluxes in the range 6-8031 µJy. Twenty-eight stars are new radio sources, increasing the number of radio detected MCVs to more that 40. …