Multi-wavelength study of the high Galactic latitude supernova remnant candidate G118.4+37.0 associated with the Calvera pulsar

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Table 4

Main characteristics of SNRs at high Galactic latitude.

SNR	Age (kyr)	Distance (kpc)	Pre-shock density (cm^–3)	Reference
G118.4+37.0 (Calvera’s SNR)	~10	~2	0.03–0.2^a	This work
G249.5+24.5 (Hoinga)	21–150	0.45–1.2	0.16–0.42	Becker et al. (2021)
G354.0–33.5	~200	<0.4	~0.1	Fesen et al. (2021)
G116.6–26.1	~40	~3	~10^–3	Churazov et al. (2021)
G70.0–21.5	~90^b	1–2	<200	Fesen et al. (2015)
G017.8+16.7	>10	1.4–3.5	–	Araya et al. (2022)
G181.1+9.5	<16 000	~1.5	0.9–1.5	Kothes et al. (2017)

Notes. ^a Estimated by dividing the measured post-shock density by the compression ratio (r_c=4). ^b Estimated by dividing the observed radius and the shock velocity inferred from proper motion for a distance of 1 kpc.

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