![\begin{figure}
\par\includegraphics[width=8.5cm]{7599fig1CMJN.eps} \end{figure}](/articles/aa/full/2007/24/aa7599-07/img24.gif) |
Figure 1:
a) The 1 mm-continuum PdBI map (at 218 GHz) of 4C 31.04 (contours: 3 ,
4,
7
to 55
in steps of 6;
 mJy beam-1) is overlaid on the R-H color image of Pe01 from HST (color scale). (
 ,
 )-offsets in arcsec are relative to the location of the AGN.
b) The HCO+ (1-0) line maps of 4C 31.04 obtained after subtraction of the continuum source for the three velocity channels defined in Fig. 3: I(emission) = [-300, 25] km s-1 (black thin contours; with maximum at B), II(absorption) = [25, 275] km s-1 (grey contours; with maximum at the AGN), III(emission) = [275, 900] km s-1 (black thick contours; with maximum at A). Levels are  ,
 ,
and 4.5
for channel I (1(I) = 0.06Jy km s-1),  ,
to
in steps of 
for channel II (1(II) = 0.05Jy km s-1) and 5
to 13
in steps of 
for channel III (1(III) = 0.08Jy km s-1). HCO+ contours are overlaid on the F702W HST image of Pe01 (color scale in mag pixel-1). Ellipses represent the beams at 218 GHz ( a)) and 84 GHz ( b)). See Sect. 3 for details. |
| Open with DEXTER | |
In the text
![\begin{figure}
\par\includegraphics[width=8.5cm]{7599fig2CMJN.eps} \end{figure}](/articles/aa/full/2007/24/aa7599-07/img56.gif) |
Figure 2:
The kinematics of molecular gas along the strip connecting points A and B (emission peaks for HCO+(1-0)) are illustrated by a position-velocity diagram. Contour levels represent emission of HCO+(1-0): 2,
2.5,
3
to 7
in steps of 1;
 mJy beam-1. Color scale (mJy beam-1) represents absorption in HCO+(1-0) near the AGN. X-offsets are in arcsec relative to the position closest to the AGN. The velocity scale in Y axis is relative to
 . |
| Open with DEXTER | |
In the text
![\begin{figure}
\par\includegraphics[width=8.7cm]{7599fig3.eps} \end{figure}](/articles/aa/full/2007/24/aa7599-07/img58.gif) |
Figure 3:
a) Spectrum of the HCO+(1-0) line emission and absorption at the central offset (AGN) of 4C 31.04. A strong absorption line is detected against the 3 mm continuum source. Velocity scale is relative to  ,
which corresponds to z=0.0592. b) Same as a) but for the CO(2-1) line. c) A zoomed view on the spectrum shown in a) helps to delimit intervals I-to-III and derive a new value for
 . |
| Open with DEXTER | |
In the text