N2713 Scan 296

Contents

Observing log information

  Object:           N2713
  On scan num:      296 298 300 302 304 306 308 310 312 314 316 318
  Off scan num:     297 299 301 303 305 307 309 311 313 315 317 319
  R.A.:             8.955698 hrs
  Dec.:             2.921291 deg
  On azimuth:       143.050463 deg
  On zenith dist.:  41.376489 deg
  Off azimuth:      143.014543 deg
  Off zenith dist.: 41.389268 deg
  MJD:              52234
  UTC:              0.360197
  Center freq.:     1402.197137 MHz
  Doppler:          0.00009532
  Num. correlators: 2
  Spectrom. atten.: 34 40 dB
  Bandwidth:         5.0 MHz
  Num. channels:    1024
  Eff. integration: 3600 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

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 first-order least squares fit baseline removed using most of the baseline shown in Figure 1. Narrow band interference was removed from 11 channels by interpolation between the nearest valid channels

Figure 2. Measured spectrum

Measured parameters

  Peak intensity:      0.035 Jy
  Lower 20% velocity: 3600.3 km/s
  Upper 20% velocity: 4250.1 km/s
   Systemic velocity: 3925.2 km/s
   Line width (20%):   649.8 km/s
  Profile integral:   11.65 Jy * km/s
                 A:    9.25
                 B:   11.33
         Ratio B/A:   1.225
  Flux integral
     velocity range:  3576.2 - 4264.6 km/s

Comments