CO J=1-0 observations of molecular gas interacting with galactic supernova remnants G5.4-1.2, G5.55+0.32 and G5.71-0.08

TL;DR

This study uses CO J=1-0 observations to analyze molecular gas interactions with multiple galactic supernova remnants, revealing bright CO emissions, outflows, and molecular shells associated with these remnants.

Contribution

It provides new detailed CO emission maps and identifies molecular outflows and shells linked to supernova remnants G5.4-1.2, G5.55+0.32, and G5.71-0.08, enhancing understanding of their molecular environments.

Findings

Detection of bright CO emission at maser velocities

Identification of a bipolar outflow near G5.55+0.32

Extended molecular gas around G5.89-0.39 (W28A2)

Abstract

The field just West of the galactic supernova remnant W28 (l=6.4\degr, b=-0.2\degr) harbors 3 of 5 newly-discovered 1720 OH maser spots and two recently-discovered candidate supernova candidates (one of which is a $\gamma$-ray source), as well as several compact and classical HII regions. Here, we analyze a datacube of CO J=1-0 emission having 1\arcmin and 1 \kms resolution, made with on-the-fly mapping over the region $5\degr \le l \le 6\degr, -1\degr \le b \le 0.5\degr$}. {Extended and often very bright CO emission was detected at the velocities of the 1720 MHz OH masers and around the supernova remnant G5.55+0.32 which lacks a maser. A new bipolar outflow which is marginally resolved at 1\arcmin resolution and strong in CO (12K) was detected at the periphery of G5.55+0.32, coincident with an MSX source; there is also a bright rim of CO just beyond the periphery of the radio remnant. The OH maser near G5.71-0.08 lies on a shell of strongly-emitting molecular gas (up to 20K) . At the -21 \kms velocity of G5.4-1.2, CO covers much of the field but is weak (3 K) and undisturbed near the remnant. The extended molecular gas around the compact H II region and outflow in G5.89-0.39 (W28A2) is shown for the first time.}