Suggestion for the search of H 2CC in cool cosmic objects

Abstract

The transition 1 11 − 1 10 at 4.829 GHz of formaldehyde (H 2CO) was the first one showing the anomalous absorption, i.e., the absorption against the cosmic microwave background. Anomalous absorption is an unusual phenomena. Structure of H 2CC is very similar to that of H 2CO and H 2CS. Both H 2CO and H 2CS have already been identified in a number of cosmic objects. Though H 2CC is not yet identified in the cosmic objects, we propose that H 2CC may be identified in cool cosmic objects through its transition 1 11 − 1 10 at 4.85 GHz in anomalous absorption.