Suggestion for search of silanone (H2SiO) in interstellar medium

Abstract

Thirteen silicon bearing molecules are detected in the cosmic objects. Carbon (C) and silicon (Si) elements have similar chemical properties and the formaldehyde (H2CO) is identified in a large number of cosmic objects. Hence, there is a possibility of Silanone (H2SiO) being present in the ISM. For each of the ortho and para species of H2SiO, we have calculated energies of 100 lower rotational levels (up to 284 cm−1) and the Einstein coefficients for radiative transitions between the levels. We have solved a set of 100 statistical equilibrium equations coupled with the equations of radiative transfer for each specie where the collisional rate coefficients are taken from a scaling law. For the ortho-H2SiO, five transitions, 110-111, 211-212,312-313,413-414 and 514-515 are found to show the anomalous absorption, and one transition 212-111 is found to show the emission feature. For the para-H2SiO, four transitions, 101-000,202-101,660-514 and 661-542 are found to show the emission feature. These lines may help in the identification of H2SiO in a cosmic object, e.g., in IRC+10216.