Camera and Filter(s)

Camera

In photometry mode, the user is offered a choice of one of three measurement channels of the Field Camera Unit (FCU):

UVO – Channel with diffraction quality in the near ultraviolet and visible ranges and a large field of view (UVO);
NUV – Channel with high sensitivity to near ultraviolet radiation, high angular resolution (NUV);
FUV – Channel with high sensitivity to vacuum ultraviolet radiation, high angular resolution (FUV);

Technical specifications of the measurement channel detectors:

Parameter Name	FUV	NUV	UVO
Detector Type	MCP	CCD	CCD
Working Spectral Range, nm	115-176	220-320	115 – 1000
Local Dynamic Range, counts/s	100 - for a light spot size corresponding to PSF
Total Dynamic Range, counts/s	100000
Field of View	1.4' (diameter)	1.5' (diameter)	4.5' × 4.5'
Image Scale, "/pixel	0.03	0.03	0.134
Pixel Size, microns	11
Dark Current, counts/s/pixel	4E-5	4E-4	0.3
Read Noise, electrons	0	1.5	1.5

Quantum Efficiency of Detectors

Filter(s)

Additionally, in each channel - the user is offered a choice of filter(s) that will be used when solving a task related to source photometry:

FUV Channel

The FUV channel has 3 sequential filter wheels.

List of FUV Channel Filters:

Name	Minimum Wavelength, nm	Width, nm	Note
F115LP	115	-	MgF2
F125LP	125	-	CaF2
F140LP	145	-	BaF2
F150LP	150		Crystalline Quartz
F165LP	165	-	Fused Quartz

Throughput without filter:

Throughput with filter:

NUV Channel

The NUV channel has 3 sequential filter wheels.

List of NUV Channel Filters:

Name	Central Wavelength, nm	Width, nm	Note
F255W	255	50
F336W	336	50
F232N	232	5
F280N	280	5
F308N	308	5

Throughput without filter:

Throughput with filter:

UVO Channel

The UVO channel has 3 sequential filter wheels.

List of UVO Channel Filters:

Name	Central Wavelength, nm	Width, nm	Note
F255W	255	50
F336W	336	50
F438W	438	70
F555W	555	150
F606W	606	230
F814W	814	260
F232N	232	5
F280N	280	5
F308N	308	5
F656N	656	5
F673N	673	10

Throughput without filter:

Throughput with filter