Anomalous absorption in thioformaldehyde

作者：Chandra Suresh^*; Kumar Amit; Sharma M K

来源：New Astronomy, 2010, 15(3): 318-323.

DOI：10.1016/j.newast.2009.09.005

• ISM: molecules

Absorption against the Cosmic Microwave Background (CMB), called the anomalous absorption, is an unusual phenomenon. The transition 1(11)-1(10) at 4.829 GHz of formaldehyde (H(2)CO) Was the first one showing the anomalous absorption. The c-C(3)H(2) is the second molecule showing anomalous absorption through its transition 2(20)-2(11), at 21.590 GHz. Structure of thioformaldehyde (H(2)CS) is very similar to that of the H(2)CO. Therefore we have investigated about the physical conditions under which the transition 1(11)-1(10) at 1.0465 GHz of H(2)CS would be found in anomalous absorption in cool cosmic objects. As in case of H(2)CO, the anomalous absorption of 1(11)-1(10) of H(2)CS is found sensitive to the relative collisional rates and it requires that the collisional rate for the transition 1(11)-2(11) must be smaller than that for the transition 1(10)-2(12).

• 出版日期2010-3