VLBI detection of the HST-1 feature in the M 87 jet at 2 cm

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Table 1:

Journal of VLBA $\lambda$ 2 cm observations of M 87^a.
	Exp.	$t_{\rm int}$	$N_{{\rm ant}}$	Beam^c		$S^{{\rm VLBA,M87}}_{\rm total}$	$S^{{\rm M87}}_{\rm peak,A}$	$S^{{\rm HST-1}}_{\rm total}$	$S^{\rm HST-1}_{\rm peak,A}$	$S^{\rm HST-1}_{\rm peak,B}$	rms $_{\rm A}$ ^d	rms $_{\rm B}$ ^d
Epoch	Code	[min]		size[mas]	$\phi$ [degree]	[Jy]	[Jy beam^-1]	[mJy]	[mJy beam^-1]	[mJy beam^-1]	[ $\mu$ Jy beam^-1]	[ $\mu$ Jy beam^-1]
2000.06	`BK073A`^e,f	476	11	$2.07\times 1.35$	-7	2.26	1.24	<1.36	<0.26	<0.23	79	68
2000.35	`BK073B`^e,f	476	11	$1.88\times 1.31$	-13	2.33	1.29	<1.42	<0.20	<0.21	70	71
2000.99	`BK073C`^e,f	476	10^j	$2.12\times 1.52$	-3	2.46	1.33	<1.84	<0.25	<0.33	100	92
2001.99	`BR077D`^g,h	68	10	$1.74 \times 1.09$	-8	2.74	1.42	<5.24	<0.66	<0.70	212	262
2002.25	`BR077J`^g,h	57	10	$1.77 \times 1.13$	-6	2.54	1.40	<5.84	<0.80	<0.81	300	292
2003.09	`BL111E`^g	54	10	$1.85 \times 1.30$	-8	2.85	1.57	3.98	1.01	2.13	218	206
2004.61	`BL111N`^g	63	10	$1.88\times 1.16$	-11	2.32	1.27	22.03	4.14	8.76	198	210
2004.92	`BL111Q`^g	64	10	$1.95 \times 1.23$	-14	2.41	1.39	23.59	2.70	9.97	223	295
2005.30	`BL123E`^g	63	9^k	$2.06\times 1.37$	-16	2.35	1.37	19.72	2.57	7.03	237	226
2005.85	`BL123P`^g	63	10	$2.11\times 1.25$	-17	2.39	1.31	19.93	3.67	9.53	188	208
2006.45	`BL137F`^g	22	10	$1.85 \times 1.22$	-10	2.51	1.51	<6.96	<1.02	<1.44	295	348
2007.10	`BL137N`^g	42	10	$1.95 \times 1.23$	-13	2.67	1.53	10.49	1.14	2.94	201	255
2007.42	`BL149AA`^g	45	10	$1.78 \times 1.25$	-8	2.69	1.46	<7.70	<0.81	<1.13	272	385
2008.33	`BL149AO`^e	41	9^j	$1.77 \times 1.10$	-7	3.24	1.79	<3.22	<0.54	<0.75	193	161
2009.10	`BL149BG`ⁱ	50	9^l	$2.25\times 1.52$	-12	1.99	1.13	<5.26	<0.36	< 0.49	223	263

Notes. ^(a) Observations are in dual-polarization mode, except as indicated. ^(b) Total scheduled VLBI on-source time. ^(c) Beam A: natural weighting and tapering of Gaussian full-width half maximum 0.3 at 200 M $\lambda$ . ^(d) Root-mean-square image noise using natural weighting and tapering with a Gaussian factor of 0.3 at a radius of 200 M $\lambda$ . ^(e) Recording rate: 256 Mbit s^-1, 2 bits per sample. ^(f) Dedicated full-track experiment on M 87 (see Kovalev et al. 2007); the array included a single VLA antenna (Y1). ^(g) Recording rate: 128 Mbit s^-1, 1 bit per sample. ^(h) Single polarization hand (LL) observations only. ⁽ⁱ⁾ Recording rate: 512 Mbit s^-1, 2 bits per sample. ^(j) Antenna NL missing. ^(k) Antenna SC missing. ^(l) Antenna HN missing.

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