X-ray, optical, and radio follow-up of five thermally emitting isolated neutron star candidates

Home

All issues

Volume 705 (January 2026)

A&A, 705 (2026) A148

Full HTML

Open Access

Table 4.

Upper limits on hard X-ray excess.

	Single source PSF fitting^(a)			Multiple source PSF fitting^(b)
Source	DET_ML	Flux_{1 − 12 keV}	F_{1 − 12 keV}/F_BB	DET_ML	Flux_{1 − 12 keV}	F_{1 − 12 keV}/F_BB
		[10⁻¹⁵ erg s⁻¹ cm⁻²]	[%]		[10⁻¹⁵ erg s⁻¹ cm⁻²]	[%]
J0723	1.99	2.0 ± 1.0	$0 . 55_{- 0.28}^{+ 0.28}$ $0.55^{+0.28}_{-0.28}$	0	0.0 ± 0.5	$0 . 0_{- 0.14}^{+ 0.14}$ $0.0^{+0.14}_{-0.14}$
J0819	0.07	0.7 ± 0.8	$0 . 14_{- 0.16}^{+ 0.16}$ $0.14^{+0.16}_{-0.16}$	0.07	0.7 ± 0.8	$0 . 14_{- 0.16}^{+ 0.16}$ $0.14^{+0.16}_{-0.16}$
J0840	2.62	2.2 ± 1.0	$0 . 44_{- 0.21}^{+ 0.21}$ $0.44^{+0.21}_{-0.21}$	2.605	2.1 ± 1.0	$0 . 42_{- 0.21}^{+ 0.21}$ $0.42^{+0.21}_{-0.21}$
J1347	0.60	1.3 ± 0.9	$0 . 6_{- 0.5}^{+ 0.5}$ $0.6^{+0.5}_{-0.5}$	0.537	1.2 ± 0.9	$0 . 5_{- 0.5}^{+ 0.5}$ $0.5^{+0.5}_{-0.5}$
J1445	1516.55	117 ± 5	$74_{- 4}^{+ 4}$ $74^{+4}_{-4}$	1540.319	117 ± 5	$74_{- 4}^{+ 4}$ $74^{+4}_{-4}$

Notes. Only photons between 1 keV and 12 keV are considered. Errors give 1σ confidence levels.

^(a)

PSF fitting conducted at the position of the target, not accounting for any nearby sources.

^(b)

All nearby field sources (within 1′) included in the PSF fitting at the position of the candidates. Field sources are identified based on the results from a previous edetect_stack run.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.