Free Access

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.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.