Detection of extragalactic argonium, ArH+, toward PKS 1830−211

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Volume 582 (October 2015)

A&A, 582 (2015) L4

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Table 1

Spectroscopic data^aof the J = 1−0 transitions of ArH⁺ isotopologs observed in the present study.

Species	Rest frequency	A _ij ^b	E _low	^∫τdv(SW)^c	Δv(SW)^d	v_off(SW)^e	^∫τdv(SW)^f	^∫τdv(NE)^g
	(MHz)	(10^-3 s^-1)	(K)	(km s^-1)	(km s^-1)	(km s^-1)	(km s^-1)	(km s^-1)

³⁶ArH⁺	617 525.23 (15)	4.33	0.0	13.65 (17)	57.3 (8)	5.6 (4)	15.88 (21)	7.61 (12)
³⁸ArH⁺	616 648.76 (8)	4.31	0.0	3.90 (15)	57.3 (8)	5.6 (4)	4.59 (21)	1.68 (12)
⁴⁰ArH⁺	615 858.15 (5)	4.30	0.0				<0.42^h

Notes.

^(a)

Numbers in parentheses are one standard deviation in units of the least significant figures.

^(b)

Einstein A value.

^(c)

Velocity integrated optical depth toward the SW image from a single Gaussian fit.

^(d)

Full width at half maximum of main SW image feature from that fit constrained to be equal for all three species.

^(e)

Offset of main SW image centroid velocity with respect to the systemic velocity from that fit constrained to be equal for all three species.

^(f)

Optical depth toward the SW image integrated over channels from −80 to +110 km s^-1.

^(g)

Optical depth toward the NE image integrated over channels from −280 to −80 km s^-1.

^(h)

Upper limit, 3σ uncertainty.

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