Search Publications
Galaxy populations and redshift dependence of the correlation between infrared and radio luminosity
Massardi, M.; Negrello, M.; De Zotti, G. +4 more
We argue that the difference in infrared-to-radio luminosity ratio between local and high-redshift star-forming galaxies reflects the alternative physical conditions –including magnetic field configurations– of the dominant population of star-forming galaxies in different redshift ranges. We define three galactic types, based on our reference mode…
Characterizing cool, neutral gas, and ionized metals in the outskirts of low-z galaxy clusters
Muzahid, Sowgat; Charlton, Jane; Srianand, Raghunathan +2 more
We present the first detection of cool, neutral gas in the outskirts of low-z galaxy clusters using a statistically significant sample of 3191 z ≈ 0.2 background quasar-foreground cluster pairs by cross-matching the Hubble Spectroscopic Legacy Archive quasar catalogue with optically- and SZ-selected cluster catalogues. The median cluster mass of o…
A radio bubble shredded by gas sloshing?
Brunetti, G.; Shimwell, T. W.; Bartalucci, I. +7 more
We report on the detection of diffuse radio emission with peculiar morphology in the central region of the galaxy cluster Abell 2657. The most striking feature identified in our 144 MHz LOFAR image is a bifurcated radio arc that extends for a projected size of 150-200 kpc. From the analysis of XMM-Newton data, we find clear evidence of gas sloshin…
The HST Large Programme on NGC 6752 - V. Differences in luminosity and mass function among stellar populations
Vesperini, Enrico; Anderson, Jay; Salaris, Maurizio +8 more
We exploit the astro-photometric dataset of the multi-epoch infrared parallel field of a Hubble Space Telescope Large Programme aimed at studying the faintest stars of the globular cluster NGC 6752 to determine the luminosity and mass functions of the multiple stellar populations of this cluster. Thanks to the measurement of proper motions and dee…
SMART: spectral energy distributions Markov chain analysis with radiative transfer models
Efstathiou, Andreas; Varnava, Charalambia
In this paper we present the publicly available open-source spectral energy distribution (SED) fitting code SMART (Spectral energy distributions Markov chain Analysis with Radiative Transfer models). Implementing a Bayesian Markov chain Monte Carlo (MCMC) method, SMART fits the ultraviolet to millimetre SEDs of galaxies exclusively with radiative …
Shock-driven synchrotron radio emission from the 2021 outburst of RS Ophiuchi
Singh, Kulinder Pal; Anupama, G. C.; Sonith, L. S. +4 more
We present low-frequency radio observations of the Galactic symbiotic recurrent nova RS Ophiuchi during its 2021 outburst. The observations were carried out with the upgraded Giant Metrewave Radio Telescope spanning a frequency range of 0.15-1.4 GHz during 23-287 d post the outburst. The average value of the optically thin spectral index is α ~ -0…
Search for brown dwarfs in IC 1396 with Subaru HSC: interpreting the impact of environmental factors on substellar population
Jose, Jessy; Samal, Manash R.; Guo, Zhen +4 more
Young stellar clusters are predominantly the hub of star formation and hence, ideal to perform comprehensive studies over the least explored substellar regime. Various unanswered questions like the mass distribution in brown dwarf regime and the effect of diverse cluster environment on brown dwarf formation efficiency still plague the scientific c…
X-Rays from RS Ophiuchi's 2021 Eruption: Shocks In and Out of Ionization Equilibrium
Sokoloski, J. L.; Mukai, Koji; Islam, Nazma
The recurrent nova RS Ophiuchi (RS Oph) underwent its most recent eruption on 2021 August 8 and became the first nova to produce both detectable GeV and TeV emission. We used extensive X-ray monitoring with the Neutron Star Interior Composition Explorer Mission (NICER) to model the X-ray spectrum and probe the shock conditions throughout the 2021 …
The Atmosphere of HD 149026b: Low Metal Enrichment and Weak Energy Transport
Fortney, Jonathan J.; Batalha, Natasha E.; Mukherjee, Sagnick +1 more
Recent JWST eclipse spectra of the high-density hot Saturn HD 149026b between 2.35 and 5.08 µm have allowed for in-depth study of its atmosphere. To understand its atmospheric properties, we have created a grid of 1D radiative-convective–thermochemical–equilibrium atmosphere models and spectra with PICASO 3.0. In agreement with previous work…
Kinematic origin of white dwarfs in the solar neighborhood
Raddi, Roberto; Torres, Santiago; Zubiaur, Ainhoa
Context. White dwarfs are considered to be efficient cosmochronometers. Thanks to the recent space-borne mission Gaia, a nearly complete sample up to about 100 parsecs from the Sun has been compiled. However, the Galaxy, as a dynamic system, implies that these objects may have very diverse origins. It is therefore of paramount importance to charac…