Serendipitous discovery of the long-sought active galactic nucleus in Arp 299-A

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Volume 519 (September 2010)

A&A, 519 (2010) L5

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Table 1:

The parsec-scale structure of Arp 299-A as imaged with the EVN.
Source	Source	$\Delta~\alpha$ ^a	$\Delta~\delta$ ^a	Angular size^b	S_1.7 ( $\mu$ Jy) ^c	S_5.0 ( $\mu$ Jy)^c	Spectral index
name	type	(J2000.0)	(J2000.0)	(milliarcsec)			$\alpha_{1.7}^{5.0}$
A0	SN	33.6213	46.707	$\leq$ $4.1\times4.0$	$\leq$ 75	$307 \pm 27$	$\geq$ 1.28
A1	AGN (core)	33.6199	46.699	$\leq$ $6.1\times 2.7$	$822 \pm 48$	$716 \pm 42$	- $0.13 \pm 0.11$
A1b	AGN (jet)	33.6190	46.699	$\leq$ $10.1\times 5.1$	$314 \pm 30$	$\leq$ 66	$\leq$ -1.42
A1c	AGN (jet)	33.6183	46.695	$\leq$ $14.3 \times 6.2$	$267 \pm 28$	$\leq$ 66	$\leq$ -1.27
A5	AGN (jet)	33.6176	46.694	$\leq$ $6.9 \times 5.0$	$246 \pm 28$	$183 \pm 24$	- $0.27 \pm 0.22$

Notes. ^(a) Coordinates are given with respect to $\alpha$ = 11:28:00.0000 and $\delta$ = 58:33:00.000, and the typical uncertainty is less than 1 mas; ^(b) upper limits to the deconvolved angular size (Major axis $\times$ Minor axis, in mas) as obtained using task IMFIT within AIPS, using our 5.0 GHz for all components but A1b and A1c, which were only detected at 1.7 GHz; ^(c) the uncertainty in the reported flux density (and derived spectral index) for the detected compact components corresponds to 1 $\sigma$ , where $\sigma$ was determined by adding in quadrature the off-source rms in each image and a 5% of the local maxima, to conservatively account for possible inaccuracies in the EVN calibration. Upper limits for undetected sources are three times the off-source rms.

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