Radio study of HESS J1857+026: Gamma-rays from a superbubble?

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Table 1

Radio continuum observations with the VLA.

	HESS J1857+026	PSR J1856+0245
Date	17 Nov. 2018	11 Jan. 2019
	24 Nov. 2018	23 Feb. 2019
Array configuration	C	C
Frequency band	L	C
Bandwidth	1 GHz	4 GHz
Spectral windows	16 (64 MHz)	16 (128 MHz)
Integration time	25 min	30 min
Mapped region	1.4° × 1.4°	0.4° × 0.4°
Angular resolution	17.′′38 × 15.′′51	3.′′55 × 2.′′62
Sensitivity (rms)	0.7 mJy beam⁻¹	12 μJy beam⁻¹

Notes. The Integration time refers to the total time on-source for each pointing of the mosaic and Mapped region indicates the rough sizes of the final maps at L band (Fig. 1) and C band (Fig. 3).

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