Extreme line profile variations in the repeating changing-look active galactic nucleus IRAS 23226-3843

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Volume 707 (March 2026)

A&A, 707 (2026) A46

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Table 1.

Log of spectroscopic observations of IRAS 23226-3843.

MJD	UT-Date	Exp. time	Tel.	Obs. cond.
		[s]
50724	1997-10-03	1800	SAAO 1.9 m	clear; 1 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 8
51350	1999-06-21	600	Cerro-Tol. 4 m	clouds; –
57883	2017-05-10	900	SALT	clear; 1 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 5
57916	2017-06-12	900	SALT	clear; 2 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 0
58727	2019-09-01	2400	SAAO 1.9 m	clear; 1 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 8
58736	2019-09-10	1200	SALT	clouds; 2 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 0
58750	2019-09-24	900	SALT	clear; 1 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 5
58794	2019-11-07	900	SALT	clear; 1 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 4
58823	2019-12-06	900	SALT	clear; 1 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 3
59053	2020-07-23	2400	SAAO 1.9 m	clear; 1 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 8
59951	2023-01-06	2400	SAAO 1.9 m	clear; 1 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 8
60635	2024-11-20	2400	SAAO 1.9 m	clear; 1 $\overset{″}{.}$ $Mathematical equation: $ \overset{\prime \prime }{.} $$ 7

Notes. The new observations have been taken with the SAAO 1.9 m telescope in 2023 and 2024. In addition, we give the former observing dates already presented in Kollatschny et al. (2023). We list the modified Julian date, the UT date, the exposure time, the telescope, and the observing conditions, including the seeing.

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