N3294 Scan 320

Contents

Observing log information

  Object:           N3294
  On scan num:      320 322 324 326 328 330 332 334 336 338 340 342
  Off scan num:     321 323 325 327 329 331 333 335 337 339 341 343
  R.A.:             10.604572 hrs
  Dec.:             37.324699 deg
  On azimuth:       91.034448 deg
  On zenith dist.:  11.371814 deg
  Off azimuth:      90.764043 deg
  Off zenith dist.: 11.681587 deg
  MJD:              52234
  UTC:              0.453843
  Center freq.:     1413.086468 MHz
  Doppler:          0.00009015
  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 second-order least squares fit baseline removed using most of the baseline shown in Figure 1. Narrow band interference was removed from 14 channels by interpolation between the nearest valid channels

Figure 2. Measured spectrum

Measured parameters

  Peak intensity:      0.051 Jy
  Lower 20% velocity: 1382.8 km/s
  Upper 20% velocity: 1795.5 km/s
   Systemic velocity: 1589.1 km/s
   Line width (20%):   412.7 km/s
  Profile integral:   15.61 Jy * km/s
                 A:   12.47
                 B:   15.38
         Ratio B/A:   1.233
  Flux integral
     velocity range:  1349.9 - 1808.1 km/s

Comments

RFI on low velocity wing