A. Asgekar, LOFAR detections of low-frequency radio recombination lines towards Cassiopeia A, Astronomy & Astrophysics, vol.551, p.11, 2013.
DOI : 10.1051/0004-6361/201221001
URL : https://hal.archives-ouvertes.fr/insu-01286281

D. S. Briggs, M. Brocklehurst, and M. Salem, New Mexico Institute of Mining Technology, Computer Physics Communications, vol.13, p.39, 1977.

A. K. Dupree, W. C. Erickson, D. Mcconnell, and K. R. Anantharamaiah, Radiofrequency Recombination Lines as Diagnostics of the Cool Interstellar Medium, The Astrophysical Journal, vol.170, issue.454, pp.119-125, 1971.
DOI : 10.1086/180852

N. Indriolo, T. R. Geballe, T. Oka, and B. J. Mccall, \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $\mathrm{H}\,^{+}_{3}$ \end{document} in Diffuse Interstellar Clouds: A Tracer for the Cosmic???Ray Ionization Rate, The Astrophysical Journal, vol.671, issue.2, p.1736, 2007.
DOI : 10.1086/523036

P. M. Kalberla, W. B. Burton, D. Hartmann, E. M. Arnal, E. Bajaja et al., The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI, Astronomy and Astrophysics, vol.440, issue.2, p.775, 2005.
DOI : 10.1051/0004-6361:20041864

N. G. Kantharia and K. R. Anantharamaiah, Carbon recombination lines from the Galactic plane at 34.5 & 328 MHz, Journal of Astrophysics and Astronomy, vol.240, issue.6, p.51, 2001.
DOI : 10.1007/BF02933590

N. G. Kantharia, K. R. Anantharamaiah, and H. E. Payne, Carbon Recombination Lines between 34.5 and 770 MHz toward Cassiopeia A, The Astrophysical Journal, vol.506, issue.2, p.758, 1998.
DOI : 10.1086/306266

N. Kassim, R. A. Perley, C. L. Carilli, D. E. Harris, and W. C. Erickson, Low Frequency Observations of Cygnus A, p.182, 1996.

A. A. Konovalenko and L. G. Sodin, The 26.13 MHz absorption line in the direction of Cassiopeia A, Nature, vol.5, issue.5837, p.135, 1981.
DOI : 10.1038/294135a0

A. R. Offringa, The LOFAR radio environment, Astronomy & Astrophysics, vol.549, p.11, 2013.
DOI : 10.1051/0004-6361/201220293
URL : https://hal.archives-ouvertes.fr/insu-01289809

F. N. Owen, M. J. Ledlow, G. E. Morrison, and J. M. Hill, The Cluster of Galaxies Surrounding Cygnus A, The Astrophysical Journal, vol.488, issue.1, p.15, 1997.
DOI : 10.1086/310908

P. Palmer, Determination of Election Temperatures from Observations of Radio Lines, The Astrophysical Journal, vol.149, p.715, 1967.
DOI : 10.1086/149301

V. N. Pandey, J. E. Van-zwieten, A. G. De-bruyn, and R. Nijboer, The Low-Frequency Radio Universe, of Astronomical Society of the Pacific Conference Series, Calibrating LOFAR using the Black Board Selfcal System, p.384, 2009.

H. E. Payne, K. R. Anantharamaiah, and W. C. Erickson, Stimulated emission of carbon recombination lines from cold clouds in the direction of Cassiopeia A, The Astrophysical Journal, vol.341, p.890, 1989.
DOI : 10.1086/167547

M. Salem and M. Brocklehurst, A table of departure coefficients from thermodynamic equilibrium /b[SUB]N[/SUB] factors/ for hydrogenic ions, The Astrophysical Journal Supplement Series, vol.39, p.633, 1979.
DOI : 10.1086/190588

G. Shaw, G. J. Ferland, R. Srianand, N. P. Abel, P. A. Van-hoof et al., On the Enhanced Cosmic???Ray Ionization Rate in the Diffuse Cloud toward ?? Persei, The Astrophysical Journal, vol.675, issue.1, p.405, 2008.
DOI : 10.1086/526395

L. J. Spitzer, Physical Processes in the Interstellar Medium, 1978.
DOI : 10.1063/1.2995108