U8801 Scan 300

Contents

Observing log information

  Object:           U8801
  On scan num:      300 302 304 306 308 310 312 314 316 320 322 324 326 328 330 332 334 336 338 340 342 344 346
  Off scan num:     301 303 305 307 309 311 313 315 317 321 323 325 327 329 331 333 335 337 339 341 343 345 347
  R.A.:             13.892197 hrs
  Dec.:             -1.194393 deg
  On azimuth:       122.427279 deg
  On zenith dist.:  57.447689 deg
  Off azimuth:      122.389690 deg
  Off zenith dist.: 57.475596 deg
  MJD:              52770
  UTC:              0.038322
  Center freq.:     1387.503545 MHz
  Doppler:          -0.00003605
  Num. correlators: 2
  Spectrom. atten.: 0 0 dB
  Bandwidth:        12.5 MHz
  Num. channels:    8192
  Eff. integration: 6900 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.

Figure 2. Measured spectrum

Measured parameters

  Peak intensity:      0.017 Jy
  Lower 20% velocity: 6918.7 km/s
  Upper 20% velocity: 7295.4 km/s
   Systemic velocity: 7107.0 km/s
   Line width (20%):   376.7 km/s
  Profile integral:    4.60 Jy * km/s
                 A:    4.49
                 B:    4.70
         Ratio B/A:   1.046
  Flux integral
     velocity range:  6901.6 - 7312.7 km/s

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