Herbig-Haro objects around CG 30

TL;DR

This study investigates Herbig-Haro objects around CG 30 using multi-epoch optical imaging, revealing new HH objects, resolving HH 120 into knots, and identifying a bipolar jet, advancing understanding of star formation in this region.

Contribution

The paper presents high-resolution imaging and proper motion analysis that resolve HH 120 into knots and discover new HH objects and jets around CG 30, providing new insights into outflows in this region.

Findings

Resolved HH 120 into ten knots.

Discovered new HH objects and a bipolar jet HH 950.

Identified potential driving sources for the outflows.

Abstract

In this work we study Herbig-Haro objects located in the region around the head of the cometary globule CG 30. Two sets of optical images are presented. The first set was obtained with the 3.5 m New Technology Telescope in 1995 in three emission lines: Halpha, [SII]6731,6716 A and [OII]3729 A. The second set is an Halpha image of the CG 30/31/38 complex obtained in 2006 with the 8 m Subaru telescope. A proper motion study of the HH objects in the region was performed using the Halpha images from both epochs. Due to the high resolution of our images we were able to, for the first time, resolve the HH 120 object into ten knots and measure proper motions for some of them. We discover several new HH objects and a large bipolar jet, HH 950, emerging from the head of CG 30. We suggest that two previously known submillimeter sources are the driving sources for the HH 120 and HH 950 flows.