VLBI observations of SN 2008iz - I. Expansion velocity and limits on anisotropic expansion

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Table 3:

Comparison between SN 1993J and SN 2008iz.
Property		SN 1993J	SN 2008iz
spectral index $\alpha$		-0.99^a	-1.08^b
$L_{5~{\rm GHz}}$	[10²⁷ erg s^-1 Hz^-1]	1.5^c	2.5^d
$t_{\rm peak}$ -t₀	[days]	180^c	$\sim$ 120^d
$v_{\rm VLBI}$	[km s^-1]	14900^e	21200^b
$L_{\rm X-ray~at~t~\sim~220~days}$	[10³⁸ erg s^-1]	$\sim$ 8^f	<15^b

Notes. References: ^(a) van Dyk et al. (1994); ^(b) this work; ^(c) Weiler et al. (1998) ^(d) Marchili et al. (2010) ^(e) Marcaide et al. (1995); ^(f) Zimmermann & Aschenbach (2003).

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