N7723 Scan 216

Contents

Observing log information

  Object:           N7723
  On scan num:      216 218 220 222 224 226 228 230 232 234 236 238 240 242 244 246 248 250 252
  Off scan num:     217 219 221 223 225 227 229 231 233 235 237 239 241 243 245 247 249 251 253
  R.A.:             23.649054 hrs
  Dec.:             -12.959595 deg
  On azimuth:       122.014073 deg
  On zenith dist.:  73.559666 deg
  Off azimuth:      121.979806 deg
  Off zenith dist.: 73.589928 deg
  MJD:              52769
  UTC:              0.415509
  Center freq.:     1411.765735 MHz
  Doppler:          0.00008373
  Num. correlators: 2
  Spectrom. atten.: 0 0 dB
  Bandwidth:        12.5 MHz
  Num. channels:    8192
  Eff. integration: 5130 seconds

Raw spectrum

This spectrum is the integration of all data for the scan with spectra from both polarizations added together. The spectral intensities are Ssys * (on - off) / off, where Ssys is the system temperature in Jy. The system noise flux density equivalent is calibrated for each scan with a calibration noise source firing during each scan. The cal value, in Jy, is calibrated by comparison with a number of continuum sources as described in the summary web page

Figure 1. Unedited spectrum

Edited spectrum

This spectrum is the same as Figure 1 but with 21 60-second sub-integrations manually deleted because of interference or a bad baseline.

Figure 2. Edited spectrum

Measured spectrum

This is the section of spectrum measured to obtain the parameters listed below. The three horizontal dotted lines are the baseline, the peak level selected, and 20% of the peak level. The two vertical dotted lines mark the selected 20% line width edges. The solid horizontal line marks the velocity range chosen for the the line profile flux density integral. This spectrum has a second-order least squares fit baseline removed using most of the baseline shown in Figure 2.

Figure 3. Measured spectrum

Measured parameters

  Peak intensity:      0.049 Jy
  Lower 20% velocity: 1692.8 km/s
  Upper 20% velocity: 2024.8 km/s
   Systemic velocity: 1858.8 km/s
   Line width (20%):   332.0 km/s
  Profile integral:    8.46 Jy * km/s
                 A:    8.48
                 B:    8.44
         Ratio B/A:   0.995
  Flux integral
     velocity range:  1669.9 - 2044.2 km/s

Comments