Astron. Astrophys. 344, 779-786 (1999)

2. Observations and reduction

NGC 4414 was observed with ISO LWS on July 3 1996, centered at 12:23:57.8, 31:29:58 (B1950), for 6183 seconds using the LWS01 fast-scanning mode with 8.5 sec. integration per step and a spectral sampling interval of 8. An off-position 5 arcmin. East was observed for 1175 seconds using the LWS01 fast-scanning mode with 5 sec. integration per step and a spectral sampling interval of 2.

The LWS Standard Processed Data (SPD) were reduced using the LWS Interactive Analysis software (LIA ²). Dark currents, estimated from calibration observations, were subtracted and corrections for drifts in the detector responsivity were applied. The overlapping wavelength coverage between the 10 LWS detectors was used to adjust their relative calibration and the absolute calibration was normalised to that of detector LW1 (m).

© European Southern Observatory (ESO) 1999

Online publication: March 29, 1999
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