Karen O'Neil, Frank Ghigo

Set-up

• L-band
• 50MHz Bandwidth
  
• 8192 lags
  
• 1 Quad
  
• 8 samplers
  
• 3-level
  
• Linear Polarization
• Band centers offset by 5 MHZ (IF2=13075,13080,13085,13090)
• Observing using position-switching technique

Summary

• Pointing correction was less than 1'.
• No baselines ripples seem in either polarization.
• The bandpass shapes and rms levels for the four IFs were virtually identical and equal to the theoretical prediction.
• The determined velocities and fluxes for UGC 9179 agreed, within errors, with those found by Rick Fisher in his Galaxy HI survey
• Significant RFI seen at 1430.1, 1432.2, and 1434.4 MHz with intermods every 10 MHz starting at 1400MHz.
• This mode is ready for general use.

Observations

• Data taken on 19 Feb, 2003
  
• Data file is T_LBAND_19FEB03
  

  Scan	Source	ON time	Comments
  53,54	UGC 9179	300s	RA offset=-87'
  55,56	UGC 9179	300s	RA offset=-87'
  57,58	UGC 9179	300s	RA offset=-87'
  59,60	UGC 9179	300s	RA offset=-87'
  61,62	UGC 9179	300s	RA offset=-87'

Analysis

I. Calibrator

No calibrator observations were taken in this mode. (The wrong epoch was sent to GO.) Gain from the 1N8-0A-50-9 test, of 1.73 & 1.80 for pol. X & Y, respectively, was used.

II. Galaxy - UGC 9197o

Five 600s positioned-switched observations were made of U9197o. All of the scans were fine, although the first pair, 53/54, showed significant RFI which did not interfere with the galaxy (and is described below).

One IF1 spectra is below:

Fig 1. UGC 9179, IF1, for scans 53/54.

Fig 2. IF1 baseline for scans 53/54.

The measured flux, peak, and velocity widths of UGC 9179 falls within the errors of the flux published by Rick Fisher for all data, all IFS and all polarizations. The average of all 5 good 600s scans is below:

Fig 3. UGC 9179, IF1, for all scans, averaged

Fig 4. IF1 baseline for all scans, averaged

III. RMS

The rms noise for polarizations X and Y ranged from 16 - 17 mK for the individual data pairs, with no discernable difference between the four IFs. The theorectical value (assuming a Tsys of 19 for the two polarizations) gives 17 mK, matching the observations. The RMS of the five averaged scans was fell as 1/sqrt(time).