Short photometric analysis of the last night of observations (FXD)

Goals

• This is a preliminary photometric analysis of a sample of scans obtained during the last hours of run. The opacity went down at that time. The beam came close to the diffraction limit. The offline processing software has been largely tested on Run5 and has been quickly fixed to adapt to the new Lissajous scans on point sources. The taumeter is used for opacity correction with a nu^2 scaling between the 1.2 and 2.1mm channels (soon to be updated with the NIKAtau).

NIKA observations

• Day: 18/06/2013

• Scans: Lissajous of 5 min on secondary calibrators and otfgeom (12min) for Uranus

• Size of the Lissajous pattern: 90"x90"

• Size of the map': 180"x180"

• Opacity at 225 GHz: 0.2 (0.4 for Uranus otfgeom)

• Elevation of the sources: 40-60 deg

First the primary calibrator Uranus is set at 47.2 and 16.4 Jy.

We observe each source at both wavelengths, shown on the maps given below. Contours are at 1,2,3,4,6,8,10 and 12 sigma.

* First we start with a quasar (a true point-source) : 3C345

* Then here are 3 secondary calibrators

* Notice the second source in the NGC7538 field. A discovery?

Fluxes for 3C345 are 1.9579 +- 0.0053, 2.7098 +- 0.0016 Jy (at 1.2 and 2.1 mm)

Fluxes for MWC349 are found as : 1.8551 +- 0.0064, 1.6512 +- 0.0019 Jy

Fluxes are for NGC7538: 9.1976 +- 0.0097, 4.6906 +- 0.0029 Jy

Fluxes are for W3(OH): 10.8917 +- 0.0091, 5.4545 +- 0.0022 Jy

Noise on weak sources by tomorrow.