Search Publications
CHANG-ES XXXI—A Decade of CHANG-ES: What We Have Learned from Radio Observations of Edge-on Galaxies
Murphy, Eric; Beck, Rainer; Walterbos, Rene +21 more
CHANG-ES (Continuum Halos in Nearby Galaxies—an EVLA Survey) is an ambitious project to target 35 nearby disk galaxies that are edge-on to the line of sight. The orientation permits both the disk and halo regions to be studied. The observations were initially at 1.5 GHz (L-band) and 6.0 GHz (C-band) in a variety of VLA array configurations, and in…
The Scavenger Hunt for Quasar Samples to Be Used as Cosmological Tools
Bargiacchi, Giada; Dainotti, Maria Giovanna; Lenart, Aleksander Łukasz +1 more
Although the Λ Cold Dark Matter model is the most accredited cosmological model, information at high redshifts (z) between type Ia supernovae (z=2.26) and the Cosmic Microwave Background (z=1100) is crucial to validate this model further. To this end, we have discovered a sample of 1132 quasars up to z=7.54 exhibiting a reduced intrinsic dispersio…
Galaxy Groups as the Ultimate Probe of AGN Feedback
Finoguenov, Alexis; Gastaldello, Fabio; O'Sullivan, Ewan +3 more
The co-evolution between supermassive black holes and their environment is most directly traced by the hot atmospheres of dark matter halos. The cooling of the hot atmosphere supplies the central regions with fresh gas, igniting active galactic nuclei (AGN) with long duty cycles. The outflows from the central engine tightly couple with the surroun…
A Study of Interstellar Medium in the Line of Sight of Transient Neutron Star Low-Mass X-ray Binary, MXB 1659-298, by Timing and Spectral Analysis
Mahato, Rabindra; Baruah, Monmoyuri; Bhattacharya, Parag
This work is dedicated to the study of interstellar medium (ISM) along the line of sight (LOS) of the transient low-mass X-ray binary, MXB 1659-298, capitalizing the high resolving power of XMM-Newton in the soft energy range. We emphasized the analysis of reflection grating spectrometer (RGS) data in the energy range 0.5–2.15 keV, suitable for th…
A Comprehensive Study of Soft X-ray Absorption Features in GX 13+1 Using XMM-Newton Observations
Mahato, Rabindra; Baruah, Monmoyuri
In this study, a comprehensive analysis of the reflection grating spectrometer (RGS) data (energy range 0.33 keV to 2.5 keV) of GX 13+1 from the XMM-Newton space observatory was conducted. Numerous absorption lines have been described in earlier publications, although the majority of these investigations focused on the energy range between 3 keV a…
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…
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…
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 …
Exploring New Redshift Indicators for Radio-Powerful AGN
Carvajal, Rodrigo; Matute, Israel; Afonso, José +4 more
Active Galactic Nuclei (AGN) are relevant sources of radiation that might have helped reionising the Universe during its early epochs. The super-massive black holes (SMBHs) they host helped accreting material and emitting large amounts of energy into the medium. Recent studies have shown that, for epochs earlier than z∼5, the number density of SMB…
A Multiwavelength Dynamical State Analysis of ACT-CL J0019.6+0336
Hilton, Matt; Moodley, Kavilan; Wollack, Edward J. +8 more
In our study, we show a multiwavelength view of ACT-CL J0019.6+0336 (which hosts a radio halo), to investigate the cluster dynamics, morphology, and ICM. We use a combination of XMM-Newton images, Dark Energy Survey (DES) imaging and photometry, SDSS spectroscopic information, and 1.16 GHz MeerKAT data to study the cluster properties. Various X-ra…