M 87 at metre wavelengths: the LOFAR picture | Astronomy & Astrophysics (A&A)

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Table 1

Details of the observations.

Obs. ID	Antenna	Frequency	Date	Observation	Sampling	FWHM ¹	Maximum	Number
	type	range		length	time		resolution	of stations
		[MHz]		[s]	[s]	[deg]	[arcsec²]

L24923	HBA-DUAL²	115−162	2/3-Apr.-2011	28 810 (≃8 h)	1	~5	19 × 14	45 (7)³
L25455	LBA-INNER	30−77	14/15-Apr.-2011	28 810 (≃8 h)	2	~10	37 × 30	24 (7)³
L29694	LBA-OUTER	15−30	16-Jul.-2011	28 805 (≃8 h)	2	~10	85 × 44	25 (8)³

Notes.

⁽¹⁾

FWHM of the primary beam when points at the zenith, its shape changes during the observation time and is not circular.

⁽²⁾

“DUAL” means that the two sub-stations of the core stations are treated separately (see text for details). This is why the number of stations in the HBA observation is higher with respect to the LBA observations.

⁽³⁾

Enclosed in brackets the number of remote stations.

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