SMA Observations of Haro 2: Molecular Gas around a Hot Superbubble
Abstract
Haro 2 , a nearby dwarf starburst dwarf galaxy with strong Ly alpha emission, hosts a starburst that has created outflows and filaments. The clear evidence for galactic outflow makes it an ideal candidate for studying the effects of feedback on molecular gas in a dwarf galaxy. We observed CO(2-1) in Haro 2 at the Submillimeter Array in the compact and extended configurations, and have mapped the molecular emission with velocity resolution 4.1 km/s and spatial resolution 2.0x1.6". With this significant increase of resolution over previous measurements we see that the molecular gas comprises two components: bright clumps associated with the embedded star clusters of the starburst, and fainter extended emission east of the starburst region. The extended emission coincides with an X-ray bubble and has the kinematic signatures of a shell or bubble expanding with velocity +-35 km/s. We suggest that the starburst winds that created the X-Ray bubble have entrained molecular gas, and that the apparent velocity gradient across the photometric axis is an artifact caused by the outflow. The molecular and X-ray activity is on the east of the galaxy and the ionized outflow and optical filaments are west; their relationship is not clear.
Keywords
Cite
@article{arxiv.1909.04971,
title = {SMA Observations of Haro 2: Molecular Gas around a Hot Superbubble},
author = {Sara C. Beck and Pei-Ying Hsieh and Jean Turner},
journal= {arXiv preprint arXiv:1909.04971},
year = {2020}
}
Comments
Submitted to MNRAS 9/9/2019, Revised version accepted 2/3/2020