Object: NGC3885 On scan num: 98 100 102 104 106 108 Off scan num: 99 101 103 105 107 109 R.A.: 11.779587 hrs Dec.: -27.922670 deg On azimuth: 167.895647 deg On zenith dist.: 67.306671 deg Off azimuth: 167.855942 deg Off zenith dist.: 67.313612 deg MJD: 52639 UTC: 0.399016 Center freq.: 1412.046722 MHz Doppler: 0.00009044 Num. correlators: 2 Spectrom. atten.: 38 33 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 1740 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 2 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 second-order least squares fit baseline removed using most of the baseline shown in Figure 2.
Peak intensity: 0.014 Jy Lower 20% velocity: 1761.9 km/s Upper 20% velocity: 2129.4 km/s Systemic velocity: 1945.7 km/s Line width (20%): 367.6 km/s Profile integral: 4.11 Jy * km/s A: 3.85 B: 3.84 Ratio B/A: 0.996 Flux integral velocity range: 1741.4 - 2135.9 km/s