Detection of extragalactic argonium, ArH${}^{+}$, toward PKS~1830$-$211

Holger S. P. Müller, Sébastien Muller, Peter Schilke +6

Argonium has recently been detected as a ubiquitous molecule in our Galaxy. Model calculations indicate that its abundance peaks at molecular fractions in the range of 1E-4 to 1E-3…