A masing forbidden Fe XI line

Astronomy and Astrophysics – Astrophysics

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Forbidden Transitions, Infrared Lasers, Interstellar Masers, Ionized Gases, Iron, Novae, Optical Thickness, Photoionization, Fine Structure, High Temperature Gases, Seyfert Galaxies, Transition Probabilities

Scientific paper

I draw attention to a maser which occurs within the ground term of Fe (10+). In many photoionized environments, infrared fine-structure lines and the forbidden O I 6300 A line become optically thick but maser amplification of ionic fine-structure lines is unusual. During the course of development of a code designed to simulate gas under radiative-collisional equilibrium, the radiative transfer of roughly 500 ionic/atomic emission lines was treated using escape probabilities. Nearly all forbidden lines can become optically thick under extreme conditions, but the 3Pj = 1, 0 forbidden Fe XI 6.08 micron transition is the only line which routinely mases and can reach optical depths smaller than -5. Maser effects can alter the intensity ratio of the infrared line relative to 3Pj = 2, l 7892 A by 1/2 order of magnitude under certain conditions. A model of the coronal line region of Nova Cyg 1975 is presented, which illustrates the effects of this maser.

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