N5157 Scan 10

Contents

Observing log information

  Object:           N5157
  On scan num:      10 12 14 16 18 20 125 127 129 131 133 135 172 174 176 178 180 182 184 188 190 192 194 196 198 200 204 206 208 210 212 214 1 3 5 7 9 11 13 15 17 19 348 350 352 354 356 252 254 256 258 260 262 264 266 268 270 272 274
  Off scan num:     11 13 15 17 19 21 126 128 130 132 134 136 173 175 177 179 181 183 185 189 191 193 195 197 199 201 205 207 209 211 213 215 2 4 6 8 10 12 14 16 18 20 349 351 353 355 357 253 255 257 259 261 263 265 267 269 271 273 275
  R.A.:             13.454701 hrs
  Dec.:             32.030383 deg
  On azimuth:       290.827678 deg
  On azimuth:       98.377079 deg
  On azimuth:       266.554021 deg
  On azimuth:       70.591995 deg
  On zenith dist.:  62.947022 deg
  On zenith dist.:  22.447733 deg
  On zenith dist.:  27.368559 deg
  On zenith dist.:  60.725006 deg
  Off azimuth:      290.803593 deg
  Off azimuth:      98.339366 deg
  Off azimuth:      266.521313 deg
  Off azimuth:      70.570021 deg
  Off zenith dist.: 62.910250 deg
  Off zenith dist.: 22.479917 deg
  Off zenith dist.: 27.332564 deg
  Off zenith dist.: 60.758867 deg
  MJD:              52745
  MJD:              52264
  MJD:              52769
  MJD:              52617
  UTC:              0.433843
  UTC:              0.456725
  UTC:              0.239722
  UTC:              0.352477
  Center freq.:     1386.824663 MHz
  Doppler:          -0.00002702
  Doppler:          0.00007989
  Doppler:          -0.00005337
  Doppler:          0.00007677
  Num. correlators: 2
  Spectrom. atten.: 27 38 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 16620 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:      0.010 Jy
  Lower 20% velocity: 7046.9 km/s
  Upper 20% velocity: 7585.3 km/s
   Systemic velocity: 7316.1 km/s
   Line width (20%):   538.3 km/s
  Profile integral:    3.07 Jy * km/s
                 A:    2.75
                 B:    3.12
         Ratio B/A:   1.136
  Flux integral
     velocity range:  7023.3 - 7655.0 km/s

Comments

All spectral processor and autocorrelator scans averaged after decimating and regridding to 4.3 km/s resolution