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…
Planetary Nebula Morphologies Indicate a Jet-Driven Explosion of SN 1987A and Other Core-Collapse Supernovae
Soker, Noam
I demonstrate the usage of planetary nebulae (PNe) to infer that a pair of jets shaped the ejecta of the core-collapse supernova (CCSN) SN 1987A. The main structure of the SN 1987A inner ejecta, the 'keyhole', comprises two low-intensity zones. The northern one has a bright rim on its front, while the southern one has an elongated nozzle. An earli…
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…
M 1-92: The Death of an AGB Star Told by Its Isotopic Ratios
Sánchez Contreras, Carmen; Masa, Elisa; Alcolea, Javier +3 more
Ongoing improvements in the sensitivity of sub-mm- and mm-range interferometers and single-dish radio telescopes allow for the increasingly detailed study of AGB and post-AGB objects in molecular species other than
Correlations between IR Luminosity, Star Formation Rate, and CO Luminosity in the Local Universe
De Zotti, Gianfranco; Bianchi, Simone; Casasola, Viviana +5 more
We exploit the DustPedia sample of galaxies within approximately 40 Mpc, selecting 388 sources, to investigate the correlations between IR luminosity (LIR), the star formation rate (SFR), and the CO(1-0) luminosity (LCO) down to much lower luminosities than reached by previous analyses. We find a sub-linear dependence of the …
A Dust-Scattering Model for M1-92: A Revised Estimate of the Mass Distribution and Inclination
Morris, Mark R.; Sahai, Raghvendra; Li, Yun Qi
Preplanetary nebulae (PPNe) are formed from mass-ejecting late-stage AGB stars. Much of the light from the star gets scattered or absorbed by dust particles, giving rise to the observed reflection nebula seen at visible and near-IR wavelengths. Precursors to planetary nebulae (PNe), PPNe generally have not yet undergone any ionization by UV radiat…
Fifty Years After the Discovery of the First Stellar-Mass Black Hole: A Review of Cyg X-1
Jiang, Jiachen
Around 50 years ago, the famous bet between Stephen Hawking and Kip Thorne on whether Cyg X-1 hosts a stellar-mass black hole became a well-known story in the history of black hole science. Today, Cyg X-1 is widely recognised as hosting a stellar-mass black hole with a mass of approximately 20 solar masses. With the advancement of X-ray telescopes…
Steps toward Unraveling the Structure and Formation of Five Polar Ring Galaxies
Kulkarni, Varsha P.; Aller, Monique C.; Lackey, Kyle E.
Polar ring galaxies (PRGs) are unusual relative to common galaxies in that they consist of a central host galaxy—usually a gas-poor, early-type S0 or elliptical galaxy—surrounded by a ring of gas, dust and stars that orbit perpendicular to the major axis of the host. Despite the general quiescence of early-type galaxies (ETGs) and the rings' lack …
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…