VLBI imaging of M 81* at 43 GHz | Astronomy & Astrophysics (A&A)

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Table 2

M 81^∗ VLBI sizes.

		Major	Axis	Position	Equivalent
Frequency	Epoch(s)	axis	ratio	angle	diameter	Ref.
(GHz)		(mas)		(deg)	(mas)

1.7	1998–2005	2.24 ± 0.12	0.44 ± 0.08	65 ± 5	1.48 ± 0.29	1
2.3	Mar. 1981	1.2 ± 0.1	0.5 ± 0.1	75 ± 3	0.8 ± 0.4	2
2.3	1995–2000	1.6 ± 0.4	0.26 ± 0.24	59 ± 4	0.78 ± 0.78	1
5	Jun. 1993	0.70 ± 0.12	0	62 ± 8	...	3
5	Apr. 1976	≤ 0.4	1	...	≤ 0.4	4
5	2001–2005	0.9 ± 0.2	0.48 ± 0.41	61.6 ± 1.7	0.6 ± 0.3	1
8.3	Mar. 1981	0.50 ± 0.04	0.68 ± 0.07	50 ± 6	0.41 ± 0.06	2
8.4	1993–1996	0.53 ± 0.10	0.34 ± 0.07	50 ± 4	0.31 ± 0.09	5
8.4	Jun. 2005	0.65 ± 0.07	0.9 ± 0.2	81 ± 10	0.61 ± 0.09	6
8.4	1993–2000	0.49 ± 0.15	0.3 ± 0.2	51.1 ± 1.5	0.28 ± 0.12	1
8.4	May/Jun. 1993	0.45 ± 0.05	0.47 ± 0.18	57 ± 5	0.31 ± 0.09	3
14.9	Jun. 1993	0.31 ± 0.04	0.5 ± 0.3	48 ± 7	0.22 ± 0.09	3
22.2	Apr./May 1993	0.17 ± 0.03	0.35 ± 0.18	40 ± 8	0.10 ± 0.04	3
43	Sep. 2002	0.16 ± 0.03	0.29 ± 0.16	28 ± 8	0.086 ± 0.013	7

Notes. The values for each bibliographical reference were averaged within each frequency.

References. (1) Martí-Vidal et al. (2011); (2) Bartel et al. (1982); (3) Bietenholz et al. (1996); (4) Kellermann et al. (1976); (5) Bietenholz et al. (2000); (6) Markoff et al. (2008); (7) this work.

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