Herbig–Haro Outflows in Circinus W

Journal Article · Thu Oct 01 04:00:00 EDT 2020 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/ABB3D3· OSTI ID:23013393

Rector, T. A. ^[1]; Prato, L. ^[2]

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1. Department of Physics and Astronomy, University of Alaska Anchorage, Anchorage, AK 99508 (United States)
2. Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001 (United States)

We report the discovery of new Herbig–Haro (HH) outflows in the Western Circinus molecular cloud. They were found using a color-composite imaging method that reveals faint Hα emission in complex environments. Follow-up observations in [S ii] confirmed their classification as HH objects. Nearly half of the newly discovered objects are part of the HH 76 outflow and are associated with a likely young stellar object (YSO) candidate. We also identify the source of a second outflow. Three newly discovered objects are part of a third outflow whose origin is unknown. Four more HH objects are also discovered, each of which has a location and morphology that does not suggest an origin. In total there must be at least five YSOs in the field currently producing outflows. The discovery of new HH objects and associated driving sources in this cloud complex provides more evidence for active star formation and a relatively young age in this seldom-studied region.

• OSTI ID: 23013393
• Journal Information: The Astronomical Journal (Online), Journal Name: The Astronomical Journal (Online) Journal Issue: 4 Vol. 160; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BALMER LINES
EMISSION
GALAXIES
HYDROGEN
STAR EVOLUTION