# First submillimeter lights from Dome A: Tracing the carbon cycle in the feedback of massive stars

## TL;DR

New submillimeter observations from Dome A reveal how massive stars influence the carbon cycle in space.

## Contribution

First submillimeter CO and [CI] maps from Dome A, enabling full carbon cycle analysis in star-forming regions.

## Key findings

- Elevated CO/CO abundance ratios found in high-extinction regions.
- Massive star radiation fields penetrate clumpy ISM, affecting carbon phases.
- Observations mark a milestone for submillimeter astronomy at Dome A.

## Abstract

The cycling of carbon between its ionized, atomic, and molecular phases shapes the chemical compositions and physical conditions of the interstellar medium (ISM). However, ground-based studies of the full carbon cycle have been limited by atmospheric absorption. Dome A, the most promising site for submillimeter astronomy, has long resisted successful submillimeter astronomical observations. Using the 60-centimeter Antarctic Terahertz Explorer, we present the first successful CO (4-3) and [CI] (P13−P03) mapping observations of two archetypal triggered massive star-formation regions at Dome A. These data, together with archival [CII], provide the first complete characterization of all three carbon phases in these environments. We find elevated C0/CO abundance ratios in high-extinction regions, plausibly driven by deep penetration of intense radiation fields from massive stars into a clumpy ISM. These findings mark a major milestone for submillimeter astronomy at Dome A and offer valuable insights into the impact of massive star feedback on the surrounding ISM.

First submillimeter maps from Antarctica’s Dome A reveal how massive stars power the cosmic carbon cycle.