Free Access
Volume 541, May 2012
Article Number A63
Number of page(s) 8
Section Interstellar and circumstellar matter
Published online 30 April 2012

Online material

thumbnail Fig. 5

Herschel column density map of the B59 and Stem in the Pipe complex, as presented in Fig. 1. The red segments provide the direction of the local magnetic field as measured from near-infrared dust polarization data (Franco et al. 2010). The blue segments mark a  ± 2σ deviation on either side of the nominal field direction. Note that gravitationally unstable regions, those lying above NH2 ≃ 7 × 1021 cm-2, correspond to the white areas.

Open with DEXTER

thumbnail Fig. 6

Blow-ups of Fig. 1 showing the column density images of a portion of the Stem (left) and the B59 (right) regions over which the filament networks as traced by the DisPerSE algorithm are plotted. On these images, we can see better the “grid-like” pattern in the Stem, and the converging pattern of B59. The direction and length of each arrow show the direction and amplitude, respectively, of the asymmetry in the corresponding column density profile, for filaments having  −60° < PA <  +30° and asymmetry uncertainty better than 10%.

Open with DEXTER

thumbnail Fig. 7

Histograms of position angles for all the filaments identified with DisPerSE (solid black line) and the selected filaments (purple). A Kolmogorov-Smirnov test indicates a  ~87% chance that these two sets of filaments have the same parent distribution of position angles.

Open with DEXTER

thumbnail Fig. 8

Histogram of the deconvolved FWHM widths (black solid line) of the filaments identified in the Herschel Pipe images presented in this paper. The histogram peaks at  ~0.08 pc and has a standard deviation of 0.02 pc. The blue dashed line represents the histogram of Jeans lengths measured from the central column densities of the filament (see Arzoumanian et al. 2011).

Open with DEXTER

thumbnail Fig. 9

Schematic view of the Pipe nebula cloud, Ophiuchus streamers and Sco OB2 association. The solid straight lines represent the streamers and main body of the Ophiuchus and Pipe molecular clouds, respectively. The plus symbol marks the central position of the Sco OB 2 association. The star symbols represent the positions of some of the main members of the association, and the HI bubble observed by de Geus (1992) is also indicated.

Open with DEXTER

© ESO, 2012

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.