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HI_absorption.tex
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HI_absorption.tex
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\documentclass{standalone}
%\pagenumbering{gobble}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% schematic of two lines of sight through
% and HI cloud
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{tikz,xcolor}
\usetikzlibrary{arrows,snakes}
\usetikzlibrary{shapes.geometric}
\usetikzlibrary{backgrounds}
\begin{document}
%\tikzstyle{background grid}=[draw, black!30,step=.5cm]
%\begin{tikzpicture}[scale=1.0, font=\sffamily, show background grid]
\begin{tikzpicture}[scale=1.0, font=\sffamily]
% cloud
\draw[color=white, fill=gray!30, rotate=40] (7,-0.7) ellipse (0.5 and 2);
\node[align=center] at (5.25,4.8) {$T_{HI}$};
% background source
\node[star,star points=7,star point ratio=1.8, fill] at (7.9,5) {};
\node[align=center] at (8.3,4.7) {$T_{c}$};
% telescope
\draw[white, fill=gray!70] (0,0) -- (0.4,1.2) -- (0.8,0) -- cycle;
\draw[ultra thick] (0.2,1.9) arc (5:55:-1.7);
% lines of sight
\draw[thick, dashed] (0.45,1.2) -- (8,5);
\draw[thick, dashed] (0.45,1.2) -- (7.7,5.4);
\node at (3.0,2.95) {$1$};
\node at (3.4,2.45) {$2$};
% draw spectra
\draw[thick, ->] (0.3,3.8) -- (0.3,5.3);
\draw[thick, ->] (0.3,3.8) -- (2.8,3.8);
\node at (2.95,3.8) {\scriptsize $v$};
\node[rotate=0] at (-0.05,5.0) {\scriptsize $T_{B,1}$};
\draw[thick] plot [smooth] coordinates {(0.5,3.8) (0.9,3.81) (1.1,4.0) (1.55,5.0) (2.0,4.0) (2.2,3.81) (2.6,3.8)};
\draw[thick, ->] (5.5,0.3) -- (5.5,1.8);
\draw[thick, ->] (5.5,0.3) -- (8.0,0.3);
\node at (8.15,0.3) {\scriptsize $v$};
\node[rotate=0] at (4.7,1.6) {\scriptsize $T_{B,2}\!-\!T_{B,1}$};
\draw[thick] plot [smooth] coordinates {(5.5,1.3) (6.1,1.3) (6.3, 1.2) (6.75,0.8) (7.2,1.2) (7.4,1.3) (7.8,1.3)};
\end{tikzpicture}
\end{document}