Probing the jet base of the blazar PKS 1830−211 from the chromatic variability of its lensed images - Serendipitous ALMA observations of a strong gamma-ray flare

I. Martí-Vidal; S. Muller; F. Combes; S. Aalto; A. Beelen; J. Darling; M. Guélin; C. Henkel; C. Horellou; J. M. Marcaide; S. Martín; K. M. Menten; Dinh V-Trung; M. Zwaan

doi:10.1051/0004-6361/201322131

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Volume 558 (October 2013)

A&A, 558 (2013) A123

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Table 1

Flux densities of the NE image and flux ratios measured at the epochs of our ALMA observations.

Band	Date	Julian day	Time	Frequency^†	Flux of NE	Flux
		(–2 456 026.8)	(UTC)	(GHz)	image (Jy)^‡	ratio

B6–250 GHz	09 Apr. 2012	0.0	06:23–06:57	243.2	0.87(0.09)	1.236(0.001)
				245.1	0.86(0.09)	1.238(0.001)
				257.6	0.85(0.09)	1.232(0.001)
				260.5	0.84(0.08)	1.230(0.001)
B6–250 GHz	09 Apr. 2012	0.1	07:42–08:16	243.2	0.87(0.09)	1.234(0.001)
				245.1	0.86(0.09)	1.238(0.001)
				257.6	0.83(0.08)	1.236(0.001)
				260.5	0.83(0.08)	1.240(0.001)
B7–290 GHz	11 Apr. 2012	2.0	06:06–06:59	282.6	0.73(0.07)	1.224(0.001)
				284.4	0.73(0.07)	1.224(0.001)
				294.6	0.70(0.07)	1.223(0.001)
				296.4	0.71(0.07)	1.224(0.001)
B7–290 GHz	11 Apr. 2012	2.1	07:47–08:40	282.6	0.79(0.08)	1.251(0.002)
				284.4	0.79(0.08)	1.251(0.002)
				294.6	0.77(0.08)	1.252(0.001)
				296.4	0.78(0.08)	1.252(0.001)
B3–100 GHz	22 May 2012	43.1	09:23–10:00	92.1	1.89(0.09)	1.438(0.002)
				94.0	1.86(0.09)	1.440(0.002)
				104.1	1.75(0.09)	1.444(0.002)
				106.0	1.73(0.09)	1.444(0.002)
B6–250 GHz	23 May 2012	43.9	04:38–05:14	243.3	0.96(0.10)	1.493(0.001)
				245.1	0.95(0.10)	1.494(0.001)
				257.6	0.91(0.09)	1.497(0.001)
				260.5	0.91(0.09)	1.497(0.001)
B7–300 GHz	23 May 2012	44.0	05:47–06:21	291.6	0.86(0.09)	1.490(0.001)
				293.5	0.85(0.08)	1.488(0.001)
				303.6	0.84(0.08)	1.489(0.001)
				305.5	0.83(0.08)	1.487(0.001)
B7–300 GHz	23 May 2012	44.1	09:14–09:51	291.6	0.86(0.09)	1.530(0.002)
				293.5	0.85(0.08)	1.533(0.002)
				303.6	0.84(0.08)	1.534(0.002)
				305.5	0.83(0.08)	1.536(0.002)
B7–300 GHz	23 May 2012	44.2	10:27–11:04	291.6	0.85(0.08)	1.532(0.002)
				293.5	0.83(0.08)	1.535(0.002)
				303.6	0.83(0.08)	1.540(0.002)
				305.5	0.82(0.08)	1.540(0.002)
B7–300 GHz	04 Jun. 2012	56.0	07:18–07:52	291.6	0.77(0.08)	1.257(0.001)
				293.5	0.76(0.08)	1.257(0.001)
				303.6	0.74(0.07)	1.258(0.001)
				305.5	0.74(0.07)	1.259(0.001)
B7–300 GHz	04 Jun. 2012	56.1	08:32–09:07	291.6	0.77(0.08)	1.260(0.001)
				293.5	0.77(0.08)	1.261(0.001)
				303.6	0.71(0.07)	1.261(0.001)
				305.5	0.74(0.07)	1.261(0.001)
B3–100 GHz	04 Jun. 2012	56.1	09:42–10:18	92.1	1.79(0.09)	1.338(0.002)
				94.0	1.76(0.09)	1.331(0.002)
				104.1	1.64(0.08)	1.316(0.002)
				106.0	1.62(0.08)	1.315(0.002)
B6–250 GHz	15 Jun. 2012	67.0	07:18–07:54	243.3	0.91(0.09)	1.287(0.001)
				245.1	0.91(0.09)	1.289(0.001)
				257.6	0.86(0.09)	1.288(0.001)
				260.5	0.85(0.09)	1.288(0.001)
B3–100 GHz	15 Jun. 2012	67.1	08:53–09:29	92.1	1.86(0.09)	1.317(0.002)
				94.0	1.84(0.09)	1.316(0.002)
				104.1	1.72(0.09)	1.308(0.001)
				106.0	1.70(0.08)	1.306(0.001)

Notes.

^(†)

Frequency at the center of each ALMA spectral window. We assume an absolute flux accuracy of 5% at frequencies ~100 GHz (B3) and 10% at frequencies between ~200 and ~300 GHz (B6 and B7).

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