A multi-wavelength view of the isolated neutron star eRASSU J065715.3+260428

Open Access

Table 6.

Optical photometric parameters.

Magnitude zero-point (ZP) ^(a) [mag]	28.30
Extinction (E) ^(a) [mag]	0.087
Airmass (AM)	1.63
FWHM [pixel]	2.44
FWHM [″]	0.61
σ_sky	0.15
Detection limit ^(b) [5σ; mag]	27.32
X-ray-to-optical flux ratio [5σ]	> 5260

Notes.

^(a)

The nightly zero-point and extinction values were taken from the FORS Absolute Photometry project (https://archive.eso.org/qc1/qc1cgi?action=qc1browsetabletable=fors2photometry).

^(b)

The 5σ detection limit was calculated for a point source within an optimal Gaussian aperture via m_lim = $Z P - 2.5 log (6.75 \times \sqrt{π} \times \frac{FWHM}{2} \times σ_{sky}) - A M \times E$ $ZP-2.5\log\left(6.75\times \sqrt{\pi}\times \frac{FWHM}{2}\times\sigma_{sky}\right)-AM\times E$ .

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