Aryabhatta Research Institute
of observational Sciences
3.6m Devasthal Optical Telescope (DOT)
Aryabhatta Research Institute
of observational Sciences
TIRCAM2 can provide near-infrared imaging observations in the wavelength range from 1 to 3.7 microns. It employs an InSb array with a pixel scale of 0.17 arcsec, and it covers a field of view of 86.5 arcsec x 86.5 arcsec. It has broad-band J, H, K and narrow-band BrG, K-cont, PAH and nbL filters. Deep imaging observations show that the instrument has the capability to observe sources up to 19.0 mag, 18.8 mag and 18.0 mag with 10% photometric accuracy in J, H and K bands, respectively, with corresponding effective exposures of 550s, 550s and 1000s. Stellar images with a FWHM of 0.45 arcsec in K-band were recorded under the best conditions. Another highlight of this camera is the observational capability for sources up to magnitudes of 9.2 in the narrow L-band (nbL; λcen∼ 3.59 microns). Sources with strong polycyclic aromatic hydrocarbon (PAH) emission at 3.3 microns can also be detected with TIRCAM2. It is permanently mounted on the side-port1 of the telescope.
| Parameters | Value |
| Type | Imaging |
| Mount position | Side port 1 |
| Wavelength range | 1 - 3.7 μm |
| Array size | 512 X 512 pixel2 |
| Pixel size | 27 μm |
| Pixel scale | 0”.17 |
| Field of view | 86”.5 X 86”.5 |
| Readout noise | 30 e- |
| Readout time | 3.3 ms |
| Gain | 10e-/ADU |
| Minimum exposure time | 0.1 s |
| Available filters | broadband: J, H, K and narrowband: BrG, K-cont, PAH, nbL |
| Limiting magnitude | 19, 18.8, 18 mag with 10% photometric accuracy in J, H, K bands, respectively, with effective exposures of 550s, 550s, 1000s |
