Search Publications
Understanding High-Energy (UV and X-ray) Emission from AGB Stars—Episodic Accretion in Binary Systems
Sanz-Forcada, Jorge; Sahai, Raghvendra; Ortiz, Roberto +2 more
X-ray surveys of UV-emitting AGB stars show that ∼40% of objects with FUV emission and GALEX FUV/NUV flux ratio Rfuv/nuv ∼> 0.2 (fuvAGB stars) have variable X-ray emission characterized by very high temperatures (Tx∼35–160 MK) and luminosities (Lx∼0.002–0.2 L⊙), indicating the presence of accretion associated with a close binary companion. Howe…
Plasma Diagnostics in the Era of Integral Field Spectroscopy
Ueta, Toshiya
To understand the physical conditions of various gaseous systems, plasma diagnostics must be performed properly. To that end, it is equally important to have extinction correction performed properly, even before performing plasma diagnostics. This means that the physical conditions of the target sources—the very quantities to be derived via plasma…
Millimetre Observations of Maser-Emitting Planetary Nebulae
Boumis, Panayotis; Ramos-Larios, Gerardo; Miranda, Luis F. +7 more
Observations in the millimetre bands of maser-emitting planetary nebulae (PNe) are crucial to study their circumstellar molecular gas at the beginning of the PN phase. Maser-emitting PNe are in the earliest phases of PN formation; therefore, these sources are key objects to study the molecular content during the early evolution of PNe. These circu…
On Low Hubble Expansion Rate from Planck Data Anomalies
Capistrano, Abraão J. S.; Cabral, Luís A.; Marão, José A. P. F. +1 more
From the linear perturbations of Nash–Greene fluctuations of a background metric, we obtain profiles of Hubble function evolution H(z) and fσ8(z) measurements as compared with the ΛCDM results at intermediate redshifts 0.1<z<1. For parameter estimation, we use joint data from Planck Cosmic Microwave Background (CMB) likelihoods of CMB temper…
New Window on the Radio Emission from Galaxies, Clusters and Cosmic Web—Conference Summary
Venturi, Tiziana; Loi, Francesca
This manuscript summarizes the contributions presented and discussed during the conference "A new window on radio galaxies, clusters and cosmic web: current status and new challenges". The meeting was held online in March 2021. The works presented during the conference have been published in this associated Special Issue. Here, we outline the scie…
Phase-Space Correlations among Systems of Satellite Galaxies
Pawlowski, Marcel S.
Driven by the increasingly complete observational knowledge of systems of satellite galaxies, mutual spatial alignments and relations in velocities among satellites belonging to a common host have become a productive field of research. Numerous studies have investigated different types of such phase-space correlations and were met with varying deg…
Discovery of 178 Giant Radio Galaxies in 1059 deg2 of the Rapid ASKAP Continuum Survey at 888 MHz
Andernach, Heinz; Jiménez-Andrade, Eric F.; Willis, Anthony G.
We report the results of a visual inspection of images of the Rapid ASKAP Continuum Survey (RACS) in search of extended radio galaxies (ERG) that reach or exceed linear sizes on the order of one Megaparsec. We searched a contiguous area of 1059 deg2 from RAJ = 20h20m to 06h20m, and ‑50∘<DecJ<‑40∘, which is covered by deep multi-band optical …
The Cusp–Core Problem in Gas-Poor Dwarf Spheroidal Galaxies
Boldrini, Pierre
This review deals with the inconsistency of inner dark matter density profiles in dwarf galaxies, known as the cusp–core problem. In particular, we aim to focus on gas-poor dwarf galaxies. One of the most promising solutions to this cold dark matter small-scale issue is the stellar feedback, but it seems to be only designed for gas-rich dwarfs. Ho…
Gamma-ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei
Inoue, Yoshiyuki; Doi, Akihiro; Khangulyan, Dmitry
To explain the X-ray spectra of active galactic nuclei (AGN), non-thermal activity in AGN coronae such as pair cascade models has been extensively discussed in the past literature. Although X-ray and gamma-ray observations in the 1990s disfavored such pair cascade models, recent millimeter-wave observations of nearby Seyferts have established the …
One Source, Two Source(s): Ribs and Tethers
Knowles, Kenda; Rudnick, Lawrence; Kolokythas, Konstantinos +1 more
We present the unique and challenging case of a radio galaxy in Abell 3266 observed as part of the MeerKAT Galaxy Cluster Legacy Survey. It has quasi-periodic bright patches along the tail which connect to never-before-seen thin transverse extensions, which we call "ribs", reaching up to ∼50 kpc from the central axis of the tail. At a distance of …