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Ionized carbon is the main gas-phase reservoir of carbon in the neutral diffuse interstellar medium and its 158 micron fine structure transition [CII] is the most important cooling line of the diffuse interstellar medium (ISM). We combine…

Interstellar dust in nebulae and in the diffuse interstellar medium of galaxies contains a component which responds to illumination by ultraviolet photons with efficient luminescence in the 500 nm to 1000 nm spectral range, known as…

Astrophysics · Physics 2007-05-23 Adolf N. Witt , Uma P. Vijh

We describe a next major frontier in observational studies of galaxy evolution and star formation: linking the physical conditions in the cold, star-forming interstellar medium to host galaxy and local environment. The integrated gas…

Optical long-baseline interferometry is a unique and powerful technique for astronomical research. Since 2004, optical interferometers have produced an increasing number of scientific papers covering various fields of astrophysics. As…

Instrumentation and Methods for Astrophysics · Physics 2018-05-28 D. Defrère , C. Aerts , M. Kishimoto , P. Léna

Spectra of about 150 early-type stars in the disk of the Milky Way recorded by the Far Ultraviolet Spectroscopic Explorer (FUSE) reveal absorption features from interstellar O VI, a tracer of collisionally ionized gases at temperatures near…

We present a method for modelling star-forming clouds that combines two different models of the thermal evolution of the interstellar medium (ISM). In the combined model, where the densities are low enough that at least some part of the…

Solar and Stellar Astrophysics · Physics 2015-03-19 Matthew R. Bate , Eric R. Keto

This review covers four current questions in the behavior of the atomic and molecular interstellar medium. These include whether the atomic gas originates primarily in cold streams or hot flows onto galaxies; what the filling factor of cold…

Astrophysics of Galaxies · Physics 2017-01-11 Mordecai-Mark Mac Low

Studies of interstellar dust using the recently completed Mid-Infrared Galaxy Atlas (MIGA) and the soon to be launched Wide-Field Infrared Explorer (WIRE) satellite are summarized. Projects include looking at the distribution of dust around…

Astrophysics · Physics 2007-05-23 C. R. Kerton , P. G. Martin

As the Universe evolves, it develops a web of filamentary structure of matter. This cosmic web is filled with gas, with the most diffuse gas lying in the intergalactic regions. At low redshift, the gas is predominantly warm-hot, and one of…

Cosmology and Nongalactic Astrophysics · Physics 2022-03-30 Fabrizio Nicastro , Taotao Fang , Smita Mathur

In this chapter, we give an overview of the major components of the interstellar medium (ISM) in galaxies at a level appropriate for upper level undergraduates or beginning graduate students. We discuss the major constituents of the the ISM…

Astrophysics of Galaxies · Physics 2025-04-14 Adam K. Leroy , Alberto D. Bolatto

An important aspect of quenching star formation is the removal of the cold interstellar medium (ISM; non-ionised gas and dust) from a galaxy. In addition, dust grains can be destroyed in a hot or turbulent medium. The adopted timescale of…

In this contribution, I review the current observational evidence for the existence of filaments of Warm-Hot Intergalactic Medium (WHIM). In particular, I first focus on the controversial issue of the identification of the $z\sim 0$ highly…

Astrophysics · Physics 2019-10-23 F. Nicastro

The distribution of a low-density transition temperature (10^4.5 - 10^5.5 K) gas in the interstellar medium conveys the character and evolution of diffuse matter in the Galaxy. This difficult to observe component of the ISM emits mainly in…

Astrophysics of Galaxies · Physics 2011-09-09 Eric J. Korpela , Martin Sirk , Jerry Edelstein , Kwangil Seon , Kyoung-Wook Min , Wonyong Han

The Flexible Image Transport System (FITS) standard has been a great boon to astronomy, allowing observatories, scientists and the public to exchange astronomical information easily. The FITS standard, however, is showing its age. Developed…

With this paper we participate to the call for ideas issued by the European Space Agency to define the Science Program and plan for space missions from 2035 to 2050. In particular we present five science cases where major advancements can…

Instrumentation and Methods for Astrophysics · Physics 2021-01-26 A. Zanella , C. Zanoni , F. Arrigoni-Battaia , A. Rubin , A. Pala , C. Peroux , R. Augustin , C. Circosta , E. Emsellem , E. George , D. Milakovic , R. van der Burg , T. Kupfer

Current advanced research on infrared and visible image fusion primarily focuses on improving fusion performance, often neglecting the applicability on real-time fusion devices. In this paper, we propose a novel approach that towards…

Computer Vision and Pattern Recognition · Computer Science 2025-09-03 Xunpeng Yi , Yibing Zhang , Xinyu Xiang , Qinglong Yan , Han Xu , Jiayi Ma

This paper reviews the major advances achieved in the Orion Nebula through the use of integral field spectroscopy (IFS). Since the early work of Vasconcelos and collaborators in 2005, this technique has facilitated the investigation of…

Astrophysics of Galaxies · Physics 2014-02-25 Adal Mesa-Delgado

As part of the NASA Starlight collaboration, we look at the implications of radiation effects from impacts with the interstellar medium (ISM) on a directed energy driven relativistic spacecraft. The spacecraft experiences a stream of…

Far-infrared (FIR) and mid-infrared (MIR) fine-structure lines (FSLs) provide key diagnostics of physical conditions in the interstellar medium (ISM). Building on empirical relations established in our previous work, we use photoionization…

Astrophysics of Galaxies · Physics 2025-07-17 Bo Peng , Amit Vishwas , Cody Lamarche , Gordon Stacey , Catie Ball , Christopher Rooney , Thomas Nikola , Carl Ferkinhoff

Results from new observations of pulsars using the Ooty Radio Telescope (ORT) are used for investigating the structure of the Local Interstellar Medium (LISM). The observations show anomalous scintillation effects towards several nearby…

Astrophysics · Physics 2007-05-23 N. D. Ramesh Bhat , Yashwant Gupta , A. Pramesh Rao , P. B. Preethi