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The field of gamma-ray astronomy has experienced impressive progress over the last decade. Thanks to the advent of a new generation of imaging air Cherenkov telescopes (H.E.S.S., MAGIC, VERITAS) and thanks to the launch of the Fermi-LAT…

Instrumentation and Methods for Astrophysics · Physics 2016-07-20 Jürgen Knödlseder

We discuss some of the main open issues related to the light-up and evolution of the first accreting sources powering high redshift luminous quasars. We discuss the perspectives of future deep X-ray surveys with the International X-ray…

High Energy Astrophysical Phenomena · Physics 2010-11-05 A. Comastri , P. Ranalli , R. Gilli , C. Vignali , M. Brusa , F. Civano

The Warm-Hot Intergalactic Medium (WHIM) arises from shock-heated gas collapsing in large-scale filaments and probably harbours a substantial fraction of the baryons in the local Universe. Absorption-line measurements in the ultraviolet…

Astrophysics · Physics 2009-11-13 P. Richter , F. B. S. Paerels , J. S. Kaastra

There is increasing observational evidence that hot, highly ionized interstellar and intergalactic gas plays a significant role in the evolution of galaxies in the local universe. The primary spectral diagnostics of the warm-hot…

Astrophysics · Physics 2007-05-23 Kenneth R. Sembach

The quest for other habitable worlds and the search for life among them are major goals of modern astronomy. One way to make progress towards these goals is to obtain high-quality spectra of a large number of exoplanets over a broad range…

The Universe has evolved from an initial diffuse, uniform gas to a complex structure that includes both voids and high-density galaxy clusters connected by gaseous filaments, known as the Cosmic Web, and traced by 3D surveys of galaxies.…

Cosmology and Nongalactic Astrophysics · Physics 2023-07-28 Giulia Cerini , Nico Cappelluti , Massimiliano Galeazzi , Eugenio Ursino

The interstellar medium is a multi-phase, magnetized, and highly turbulent medium. In this paper, we address both theoretical and observational aspects of plasma turbulence in the interstellar medium. We successively consider radio wave…

Astrophysics of Galaxies · Physics 2019-12-19 Katia Ferriere

The interstellar medium (ISM) of galaxies very often contains a gas component that reaches the temperature of several million degrees, whose physical and chemical properties can be investigated through imaging and spectroscopy in the…

Astrophysics of Galaxies · Physics 2023-04-05 Emanuele Nardini , Dong-Woo Kim , Silvia Pellegrini

We discuss the different physical processes that are important to understand the thermal X-ray emission and absorption spectra of the diffuse gas in clusters of galaxies and the warm-hot intergalactic medium. The ionisation balance, line…

Astrophysics · Physics 2009-11-13 J. S. Kaastra , F. B. S. Paerels , F. Durret , S. Schindler , P. Richter

The focus of this presentation is to go through some of the remarkable observations concerning gamma-ray cosmic accelerators and diffuse emissions. Additionally, I will cover the status of the new generation of gamma-ray groundbased…

High Energy Astrophysical Phenomena · Physics 2019-02-28 Teresa Montaruli

We have designed and developed a compact ultraviolet imaging payload to fly on a range of possible platforms such as high altitude balloon experiments, cubesats, space missions, etc. The primary science goals are to study the bright UV…

Instrumentation and Methods for Astrophysics · Physics 2016-08-24 Joice Mathew , Ajin Prakash , Mayuresh Sarpotdar , A. G. Sreejith , Margarita Safonova , Jayant Murthy

In this paper we review the current predictions of numerical simulations for the origin and observability of the warm hot intergalactic medium (WHIM), the diffuse gas that contains up to 50 per cent of the baryons at z~0. During structure…

Astrophysics · Physics 2009-11-13 S. Bertone , J. Schaye , K. Dolag

Technosignatures refer to observational manifestations of technology that could be detected through astronomical means. Most previous searches for technosignatures have focused on searches for radio signals, but many current and future…

The analysis of absorption features along the line of sight to distant sources is an invaluable tool for observational cosmology, giving a direct insight into the physical and chemical state of the inter/circumgalactic medium. Such…

Instrumentation and Methods for Astrophysics · Physics 2023-05-18 Guido Cupani , Giorgio Calderone , Stefano Cristiani , Francesco Guarneri

The hot circum-galactic medium (CGM) represents the hot gas distributed beyond the stellar content of the galaxies while typically within their dark matter halos. It serves as a depository of energy and metal-enriched materials from…

High Energy Astrophysical Phenomena · Physics 2020-03-25 Jiang-Tao Li

Optical fibres have already played a huge part in ground based astronomical instrumentation, however, with the revolution in photonics currently taking place new fibre technologies and integrated optical devices are likely to have a…

Astrophysics · Physics 2009-10-16 Roger Haynes , Pam McNamara , Jackie Marcel , Nemanja Jovanovic

Observational studies indicate that the intergalactic medium (IGM) is highly ionized up to redshifts just over 6. A number of models have been developed to describe the process of reionization and the effects of the ionizing photons from…

Astrophysics · Physics 2009-11-07 Aparna Venkatesan , Mark L. Giroux , J. Michael Shull

The physical state of the intergalactic medium can be probed in great detail with the intervening absorption systems seen in quasar spectra. The properties of the Hydrogen absorbers depend on many cosmological parameters, such as the…

Astrophysics · Physics 2009-11-11 Tom Theuns

Galaxies are key objects for the study of cosmology, the life cycle of matter, and stellar evolution. X-ray observations have given us a new key window into these building blocks of the Universe, that allows us to investigate their hot…

Astrophysics · Physics 2007-05-23 G. Fabbiano