All Figures

$\begin{figure} \par\includegraphics[angle=270,width=8.1cm,clip]{4047f1bw} % \end{figure}$ Figure 1: a) 1.3 $\ensuremath{~ \ensuremath{{\rm mm}}}$ continuum map of the RW Aur system. Contour levels are 3, 6, 12, 24, 48 $\sigma$ ( $1\sigma = 0.47$ mJy/beam). Crosses indicate the peak positions, which closely correspond to RW Aur A and B. The large arrow shows the direction of the blueshifted jet. b) $\rm ^{12}CO$ J=2-1 emission blueshifted and redshifted with respect to the RW Aur A systemic velocity. Intensity was integrated from $\ensuremath {V_\ensuremath {{\rm helio}}}$ = 8 to 15.5 $\ensuremath{~ \ensuremath{{\rm km~s^{-1}}}}$ (dark contours) and from 15.9 to 23 $\ensuremath{~ \ensuremath{{\rm km~s^{-1}}}}$ (grey contours). Contour spacing is $3\sigma$ (0.12 Jy $\ensuremath{~ \ensuremath{{\rm km~s^{-1}}}}$ ), truncated to $18\sigma {}$ for clarity. c), d) Heliocentric centroid velocity and line width (i.e. first and second order moments) of the $\rm ^{12}CO$ J=2-1 line. Only pixels with integrated emission higher than $4\sigma$ are shown. (This figure is available in color in the electronic version.)
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=16cm,clip]{4047fig2} \end{figure}$ Figure 2: Channel maps of $\rm ^{12}CO$ J=2-1 towards RW Aur, rebinned to a spectral resolution of 0.41 $\ensuremath{~ \ensuremath{{\rm km~s^{-1}}}}$ . Radial velocities ( heliocentric) are given in the upper left corner of each panel. The large cross marks the position of RW Aur A, with an arrow pointing in the blue jet direction. The small cross marks the position of RW Aur B. Blue and red contours respectively indicate blue and red-shifted channels with respect to the RW Aur A mean systemic velocity ( $\ensuremath {V_\ensuremath {{\rm helio}}}\simeq 15.87 \pm 0.55$ $\ensuremath{~ \ensuremath{{\rm km~s^{-1}}}}$ , Gahm et al. 1999). Contour levels correspond to -3, 3, 6 and 12 $\sigma$ with $1\sigma = 18$ mJy/Beam = 0.8 K (see Table 1 for details). Dotted lines show negative contours. The hatched ellipse represents the beam FWHM size, $0.89''\times 0.58''$ at PA = 23 $^\circ$ . Continuum is not subtracted. (This figure is available in color in the electronic version.)
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{4047f3a.eps}\vspace*{-2.5m... ...b.eps}\par\includegraphics[angle=270,width=8.2cm,clip]{4047f3c.eps} \end{figure}$ Figure 3: Evidence for disk rotation towards RW Aur A. Top: $\rm ^{12}CO$ J=2-1 map from Fig. 1b rotated so that the blueshifted optical jet points in the -y direction. Solid contours: blueshifted emission. Dashed contours: redshifted emission. Contour spacing is $4.5\sigma$ (0.18 Jy $\ensuremath{~ \ensuremath{{\rm km~s^{-1}}}}$ ). Middle: intensity cuts along x at PA = 40 $^\circ$ , with Gaussian fits of identical 1.0'' FWHM overplotted. The blueshifted and redshifted emissions are centered respectively at $\delta x = 0.125''$ and $\delta x = -0.195''$ . Note the high signal to noise of the data. Bottom: $\rm ^{12}CO$ J=2-1 position-velocity diagram along x at PA = 40 $^\circ$ . Contour spacing is $2\sigma$ (36 mJy/Beam). Horizontal and vertical lines indicate the systemic velocity range and the position of RW Aur A. Keplerian curves are drawn for $M_\star \times \sin i$ = 0.5, 1 and $2~M_\odot$ (where i is inclination from pole-on). The middle curve corresponds to typical parameters for RW Aur A (see text). The ellipse in the lower right corner illustrates the angular and velocity resolution.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.2cm,clip]{4047fig4} \end{figure}$ Figure 4: $\rm ^{12}CO$ spectra of the RW Aur A molecular peak. Continuum emission is subtracted. The solid histogram plots the $\rm ^{12}CO$ J=2-1 spectrum, integrated over an ellipse of size $1.8''\times 1.3''$ , PA = 40 $\ensuremath {^\circ }$ . The dashed histogram shows the $\rm ^{12}CO$ J=1-0 spectrum, multiplied by 4 (theoretical J=2-1/J=1-0 flux ratio for optically thick emission in the Rayleigh-Jeans limit). The solid curves show theoretical profiles from Beckwith & Sargent (1993) for an optically thick Keplerian disk viewed at $i=45\ensuremath {^\circ }$ (upper curve) and $i=60\ensuremath {^\circ }$ (lower curve). Inferred values of disk radius and outer temperature are discussed in Sect. 4, and listed in Table 5.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.2cm,clip]{4047fig5} \end{figure}$ Figure 5: $\rm ^{12}CO$ J=2-1 position-velocity diagram in the North-South direction through RW Aur B, illustrating the asymmetry in velocity and spatial extension of the associated molecular peak. The horizontal line shows the declination of RW Aur B. The vertical line indicates the RW Aur A average systemic velocity. The bright region at (19 $\ensuremath{~ \ensuremath{{\rm km~s^{-1}}}}$ , -2.4'') is the redshifted arm. The data cube was smoothed by a 1'' Gaussian in RA to increase the S/N ratio. Contour spacing is 18 mJy/beam ( $1.5\sigma$ in the smoothed cube).
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.2cm,clip]{4047fig6} \end{figure}$ Figure 6: $\rm ^{12}CO$ spectra towards RW Aur B. Continuum emission is subtracted. The solid histogram displays the J=2-1 spectrum, integrated over the J=1-0 beam ( $2.42''\times 1.55''$ at PA = 24 $^\circ$ ). The dashed histogram displays the J=1-0 spectrum, multiplied by 4 (the 3 $\sigma$ level is then 0.12 Jy). The emission component at 11 $\ensuremath{~ \ensuremath{{\rm km~s^{-1}}}}$ appears partly optically thin.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.2cm,clip]{4047fig7.eps} \end{figure}$ Figure 7: $\rm ^{12}CO$ spectra towards the redshifted arm, centered at offset (-0.95'',-2.25) to avoid confusion from RW Aur A. Continuum emission is subtracted. The solid histogram displays the J=2-1 spectrum, integrated over the J=1-0 beam ( $2.42''\times 1.55''$ at PA = 24 $^\circ$ ). The dashed histogram displays the J=1-0 spectrum, multiplied by 4. The emission appears optically thick.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=13.5cm,clip]{4047fa1.eps} \end{figure}$ Figure A.1: Channel maps of $\rm ^{12}CO$ J=1-0 towards RW Aur, rebinned to a spectral resolution of 0.85 $\ensuremath{~ \ensuremath{{\rm km~s^{-1}}}}$ . Radial velocities ( heliocentric) are given in the upper left corner of each panel. The large cross indicates the position of RW Aur A, with an arrow pointing in the blue jet direction. The small cross indicates the position of RW Aur B. Blue and red contours respectively indicate blue and red-shifted channels with respect to the RW Aur A mean heliocentric velocity ( $\ensuremath {V_\ensuremath {{\rm helio}}}\simeq 15.87 \pm 0.55$ $\ensuremath{~ \ensuremath{{\rm km~s^{-1}}}}$ , Gahm et al. (1999)). Contour levels correspond to -3, 3, 6 and 9 $\sigma$ with $1\sigma =$ 10 mJy/Beam = 0.24 K (see Table 1 for details). Dotted lines show negative contours. The hatched ellipse represents the beam FWHM size, $2.42''\times 1.55''$ at PA = 24 $^\circ$ . Continuum is not subtracted.

In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.2cm,clip]{4047fig7.eps} \end{figure}$	Figure 7: $\rm ^{12}CO$ spectra towards the redshifted arm, centered at offset (-0.95'',-2.25) to avoid confusion from RW Aur A. Continuum emission is subtracted. The solid histogram displays the J=2-1 spectrum, integrated over the J=1-0 beam ( $2.42''\times 1.55''$ at PA = 24 $^\circ$ ). The dashed histogram displays the J=1-0 spectrum, multiplied by 4. The emission appears optically thick.
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