Volume 426, Number 1, October IV 2004
|Page(s)||171 - 183|
|Section||Interstellar and circumstellar matter|
|Published online||05 October 2004|
I. Near-infrared observations
Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany e-mail: firstname.lastname@example.org;email@example.com
2 Armagh Observatory, Armagh BT61 9DG, Northern Ireland, UK e-mail: firstname.lastname@example.org
3 MPI für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany e-mail: email@example.com
Accepted: 22 June 2004
We present an unbiased search for molecular hydrogen emission in the L1688 cloud within the ρ Ophiuchi molecular cloud complex. Our near-infrared survey covers a connected region of extent 35´ 35´. We detect several new H2 flows but the total number of detected outflows is low and is consistent with the paucity of Class 0 and Class 1 sources in the molecular cloud. From the spatial distribution, their collimation and the individual shapes of the bow shocks, we suggest possible candidates for the outflow sources. Most of the candidate driving sources are deeply embedded in dense cores of the molecular cloud. A very young outflow arises from the newly discovered Class 0 source MMS 126. Two major outflows in the NE–SW direction arise from the YLW 15 and YLW 16 Class I sources. Three additional outflows, which both extend over several arcminutes, arise from the Class I sources YLW 31 and YLW 52. Flow directions are generally NE–SW, perpendicular to the elongation directions of the cloud filaments. The apparent extents of molecular flows are related to either the widths of cloud filaments or to the separation between filaments. The estimated jet power needed to continuously drive and excite the detected portions of the shocked H2 outflows lies in the range 0.02-0.2 . Given the critical dependence on the environment, however, the total sizes and powers of the outflows may be considerably larger.
Key words: stars: formation / ISM: jets and outflows / ISM: clouds
Based on observations collected at the European Southern Observatory, Chile (ESO No. 67.C-0284), and the German-Spanish Astronomical Center, Calar Alto, operated jointly by Max-Planck Institut für Astronomie and Instituto de Astrofisica de Andalucia.
© ESO, 2004
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.