A survey of IRAS young stellar object candidates. Searching for large-scale Herbig-Haro objects

Abstract

Jets and outflows are associated with young stellar objects across the stellar mass spectrum, from brown dwarf protostars to massive, Ae/Be stars. Frequently, the jet morphology is spatially discontinuous because of the temporal variability of the ejection from the driving source. Images covering a wide field of view around the jet driving-source are useful to map the large-scale jet emission and to explore the mass ejection history. The aim of this work was to search for large-scale optical Herbig-Haro (HH) objects lying in a wide field around a sample of IRAS sources, candidates to trace young stellar objects. Deep, narrow-band images through the H$\alpha$ and [SII] emission lines, and through an off-line continuum filter, covering a wide ($\sim 15^{\prime }$) field around the IRAS targets were acquired. The images in the three filters were analyzed to identify shock-excited line emission (i.e., HH) in contrast to scattered line emission. New images of a sample of fifteen IRAS sources, obtained in an homogeneous way are presented. HH emission was detected in six fields, and the astrometry of the knot features is given. The nature of the extended emission as scattered emission around nine of the IRAS targets is confirmed. For seven IRAS sources, with unclear optical counterpart, a more plausible counterpart is proposed. A refined value of the source distance is reported for seven targets. An update of the main data available for each of the sampled fields, including images from public data archives, is also presented.

20 pages. 49 figures Accepted to be published in A&A

References in corpus (12)

• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• A Compendium of Distances to Molecular Clouds in the Star Formation Handbook
• Evolution of emission line activity in intermediate mass young stars
• A spectroscopic atlas of post-AGB stars and planetary nebulae selected from the IRAS Point Source Catalogue
• The Evolution of the Multiplicity of Embedded Protostars I: Sample Properties and Binary Detections
• Infrared Nebulae Around Young Stellar Objects
• Search for ionized jets towards high-mass young stellar objects
• The Giant Herbig-Haro Flow HH 212 and Associated Star Formation
• The Molecular Gas Environment around Two Herbig Ae/Be Stars: Resolving the Outflows of LkHa 198 and LkHa 225S
• The Brightening of Re50N: Accretion Event or Dust Clearing?
• Protostellar Outflows in L1340