BASS - XLIII. Optical, UV, and X-ray emission properties of unobscured Swift/BAT active galactic nuclei

Open Access

Table 1.

Characteristics of Swift/UVOT filters.

Filter	Central Wavelength	FWHM	AB Zero-point ^(a)	Counts to Flux (F_λ) Ratio
	(Å)	(Å)	(mag)	( $10^{- 16} {erg count}^{- 1} {cm}^{- 2} Å^{- 1}$ $10^{-16}\,\mathrm{erg\,count}^{-1}\,\mathrm{cm}^{-2}\,\AA^{-1}$ )
UVW2	1928	657	19.11 ± 0.03	6.225 ± 0.1300
UVM2	2246	498	18.54 ± 0.03	8.489 ± 0.0530
UVW1	2600	693	18.95 ± 0.03	4.623 ± 0.1400
U	3465	785	19.36 ± 0.02	1.663 ± 0.0250
B	4392	975	18.98 ± 0.02	1.480 ± 0.0056
V	5468	769	17.88 ± 0.01	2.611 ± 0.0087

Notes. The central wavelength corresponds to the mid-point between the wavelengths at the full width at half maximum (FWHM). The zero-point magnitude represents the magnitude of a source producing one count per second.

^(a)

https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/swift/docs/uvot/uvot_caldb_AB_10wa.pdf

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