Astronomy & Astrophysics

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$\begin{figure} \par\includegraphics[width=7.5cm]{9337fig1.eps}\end{figure}$ Figure 1: a) Shock (contact discontinuity) radius $R_{\rm s}$ ( $R_{\rm c}$ ) and shock (contact discontinuity) speed $V_{\rm s}$ ( $V_{\rm c}$ ) in units of $R_0=(4~\mbox{kpc}/{ d})$ pc and $V_0=10^4(4~\mbox{kpc}/{ d})$ km s^-1; b) total shock ( $\sigma$ ) and subshock ( $\sigma _{\rm s}$ ) compression ratios for Tycho's SNR as functions of time, calculated for four different distances d. The dotted vertical line marks the current epoch, t=435 yrs. The observed mean size ( filled circle) and speed ( filled square) of the shock, as determined by radio measurements (Tan & Gull 1985), are shown as well.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{9337fig2.eps}\end{figure}$ Figure 2: Synchrotron emission flux as a function of frequency for the same four cases as in Fig. 1, at the current time. The thin dot-dot-dashed line represents the flux expected in the test particle limit for an interior magnetic field strength $B_{\rm d}=20$ $\mu$ G. The observed X-ray (Allen et al. 1999) and radio emission (Reynolds & Ellison 1992) are shown as well.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{9337fig3.eps}\end{figure}$ Figure 3: The ratio $R_{\rm c}/R_{\rm s}$ of the contact discontinuity radius to the forward shock radius as a function of time, calculated for four different source distances, together with the observationally determined value of Warren et al. (2005).
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{9337fig4.eps}\end{figure}$ Figure 4: Spectral energy distributions of the $\gamma$ -ray emission from Tycho's SNR (total spectrum, which is the sum of all components, a), and separately $\pi ^0$ -decay, inverse Compton (IC) and non-thermal Bremstrahlung (NB) components, b)), as functions of $\gamma$ -ray energy $\epsilon _{\gamma }$ , calculated for different source distances, together with the upper limits measured by the HEGRA (H-CT; Aharonian et al. 2001) and Whipple (W; Buckley et al. 1998) Cherenkov telescopes, the HEGRA AIROBICC (HA; Prahl & Prosch 1997) upper limit, and data presented by SHALON (S; Sinitsyna et al. 2007). The thin dot-dot-dashed line in Fig. 4a represents the IC spectrum that is expected to be produced in the test particle case.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{9337fig2.eps}\end{figure}$	Figure 2: Synchrotron emission flux as a function of frequency for the same four cases as in Fig. 1, at the current time. The thin dot-dot-dashed line represents the flux expected in the test particle limit for an interior magnetic field strength $B_{\rm d}=20$ $\mu$ G. The observed X-ray (Allen et al. 1999) and radio emission (Reynolds & Ellison 1992) are shown as well.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{9337fig3.eps}\end{figure}$	Figure 3: The ratio $R_{\rm c}/R_{\rm s}$ of the contact discontinuity radius to the forward shock radius as a function of time, calculated for four different source distances, together with the observationally determined value of Warren et al. (2005).
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