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A&A
Volume 541, May 2012
Article Number A58
Number of page(s) 23
Section Interstellar and circumstellar matter
DOI https://doi.org/10.1051/0004-6361/201218771
Published online 27 April 2012

Online material

Appendix A: CO line kinematics around three additional objects

thumbnail Fig. A.1

A right ascension-velocity diagram of CO emission 20′′ North of B2251+158. The CO absorption spectrum toward B2251 is shown with its 0-level at the location of the continuum source; the peak absorption is 22%, see Fig. 7. Contours are shown at levels 1−3, ... K.

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thumbnail Fig. A.2

A right ascension-velocity diagram of CO emission across the field of B0212+735. The CO absorption spectrum toward B0212 is shown with its 0-level at the location of the continuum source; the strongest absorption line is quite opaque, see Fig. 10. Contours are shown at levels 1−3, ... K.

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Shown in Figs. A.1 − A.3 are position-velocity diagrams in right ascension across the positions of B2251+158, b0212+735 and B0224+671. As in Figs. 13 and 14 in the main text, the HCO+ absorption spectrum toward the continuum background target is superposed in the figures with its baseline positioned where the diagram most nearly crosses the location of the continuum. These diagrams are intended to show how the features that occur in the absorption line profiles are somewhat haphazard samples of the larger scale gas distribution traced in CO emission but toward B0212+735 the diagram also indicates how the CO emission underrepresents the molecular gas distribution.

thumbnail Fig. A.3

A right ascension-velocity diagram of CO emission across the field of B0224+671 at the declination of the continuum source. The CO absorption spectrum toward B0224+671 is shown with its 0-level at the location of the continuum source; the peak optical depth is 1.2, see Fig. 11. Contours are shown at levels 1−3, ... K.

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Appendix B: The galaxy viewed in atomic gas around the background targets

thumbnail Fig. B.1

Latitude-velocity diagrams of H I brightness around six background targets used for mm-wave molecular absorption studies, using H I data from the LDSS survey (Hartmann & Burton 1997). The spatial resolution is 35′ and the diagrams were constructed at the nearest longitude on the 0.5° grid of the survey datacube. The latitudes of the sources are marked. The line of sight toward B0415+379 (3C 111) is not discussed in this work.

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thumbnail Fig. B.2

Latitude-velocity diagrams of H I brightness around six background targets used for mm-wave molecular absorption studies, using H I data from the LDSS survey (Hartmann & Burton 1997), as in Fig. B.1.

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To provide context for the kinematics seen in the present work, Figs. B.1 and B.2 show large-galactic-scale H I latitude-velocity diagrams for each of the sources studied here, using results of the LDSS survey of Hartmann & Burton (1997). The spatial resolution of these data is 35′ and the data are on a 30′ grid. The diagrams were constructed at the galactic longitude nearest the background target (see Table 1). The latitudes of the sources are marked. Even if it was not apparent from the overlap of the H I and molecular absorption in the figures in the text, these maps make it clear that the molecular gas studied here is part of “normal” galactic structure, mixed into the general ISM.


© ESO, 2012

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