Object: Mrk331 On scan num: 159 161 163 165 167 169 Off scan num: 160 162 164 166 168 170 R.A.: 23.857455 hrs Dec.: 20.586131 deg On azimuth: 253.653117 deg On zenith dist.: 38.168130 deg Off azimuth: 253.615212 deg Off zenith dist.: 38.136760 deg MJD: 52421 UTC: 0.643067 Center freq.: 1394.738543 MHz Doppler: 0.00007841 Num. correlators: 2 Spectrom. atten.: 35 42 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 1440 seconds
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
This spectrum is the same as Figure 1 but with 12 60-second sub-integrations manually deleted because of interference or a bad baseline.
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 6th-order least squares fit baseline removed using most of the baseline shown in Figure 2.
Peak intensity: 0.041 Jy Lower 20% velocity: 5227.4 km/s Upper 20% velocity: 5610.3 km/s Systemic velocity: 5418.8 km/s Line width (20%): 382.9 km/s Profile integral: 13.69 Jy * km/s A: 11.92 B: 13.68 Ratio B/A: 1.147 Flux integral velocity range: 5201.0 - 5643.2 km/s
very poor baseline, flux density integral very inaccurate