Diff for "HLS091828"

Brief analysis of the faint source HLS091828 (z=5.243)

Coordinates:

• R.A. = 09h18m28.6s
• Dec. = 51d42'23.3"

Expected luxes (Combes et al. 2012):

• F1.3sma= 55+-7mJy
• F0.88mm= 125+-8mJy
• F2mm= 15+-7mJy

NIKA obsevations:

• Day: 13/06/2013

• Scans: 9 Lissajous of 5 min (<=> 45 min) each with followed by tracks (for tuning), 180 to 197

• Size of the map:90"x90"

• We detect the source at both wavelenghts, shown on the maps given bellow.

  1mm_map.pdf	2mm_map.pdf

• The profiles are computed by averaging the map in concentric annuli, and we check that the measured flux is, a priori, consistent with what we expect at 2mm but too high at 1mm.

  1mm_profile.pdf	2mm_profile.pdf

• The time per pixel maps are also shown

  1mm_time.pdf	2mm_time.pdf

• Combining Jack-Knife maps and time per pixel maps, we are able to estimate the noise level in the data. Note that this is in the case of high opacity (we can expect the noise to be reduced by a factor of about exp(-tau/sin(elevation)) ~ 2, and even more since the resonances are larger), and at 1mm it might also be reduce (again) by a factor of ~2 since we are apparently over calibrated.
• If this is correct, the noise is:

• ~50 mJy/Beam.sqrt(s) at 1mm

• ~15 mJy/Beam.sqrt(s) at 2mm

  1mm_noise.pdf	2mm_noise.pdf