COVER INFORMATION Station: VLBA_OV (Code Ov ) Experiment: Helical structure in B1524-136 jets Exp. Code: gm052b Schedule Version: 1.00 Processed by SCHED version: Release of 18 Sept. 2003 PI: Franco Mantovani Address: Istituto di Radioastronomia Via P. Gobetti, 101 I-40129 Bologna Italy Phone: +39 051 639 9377 EMAIL: fmantovani@ira.cnr.it Fax: +39 051 639 9431 Phone during observation: Observing mode: Continuum Notes: Schedule for VLBA_OV (Code Ov ) Page 2 Helical structure in B1524-136 jets UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Sat 14 Feb 2004 Day 45 --- Next scan frequencies: 4960.49 4968.49 4976.49 4984.49 4992.49 5000.49 5008.49 5016.49 Next BBC frequencies: 860.49 868.49 876.49 884.49 892.49 900.49 908.49 916.49 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 08 27 00 1637+574 10 08 45 27.0 36.9 -6.5 -62.4 0 1 1 0 08 27 00 08 31 00 --- 10 12 46 27.5 37.2 -6.4 -63.1 240 F 1 3200 08 33 00 1524-136 10 14 46 0.8 108.2 -5.2 D -51.2 64 1 1 3200 08 33 00 08 51 00 --- 10 32 49 4.2 111.0 -4.9 H -50.0 0 F 1 17600 08 53 00 1524-136 10 34 49 4.6 111.3 -4.9 H -49.8 114 1 2 17600 08 53 00 09 15 00 --- 10 56 53 8.6 114.8 -4.5 -48.1 0 R 1 0 09 17 00 1524-136 10 58 53 9.0 115.1 -4.5 -47.9 114 1 3 0 09 17 00 09 39 00 --- 11 20 57 12.9 118.9 -4.1 -45.9 1320 F 1 17600 09 41 00 1524-136 11 22 57 13.2 119.2 -4.1 -45.7 114 1 4 17600 09 41 00 10 03 00 --- 11 45 01 17.0 123.2 -3.7 -43.4 1320 R 1 0 10 05 00 1524-136 11 47 01 17.3 123.5 -3.7 -43.1 114 1 5 0 10 05 00 10 27 00 --- 12 09 05 20.9 127.8 -3.3 -40.4 1320 F 1 17600 10 29 00 1642+690 12 11 05 42.3 26.7 -4.5 -94.9 47 1 6 17600 10 29 00 10 33 00 --- 12 15 06 42.7 26.7 -4.5 -95.9 240 R 1 14400 10 35 00 1524-136 12 17 06 22.1 129.4 -3.2 -39.3 46 1 6 14400 10 35 00 10 53 00 --- 12 35 09 24.8 133.1 -2.9 -36.8 1080 R 1 0 10 55 00 1524-136 12 37 09 25.1 133.6 -2.8 -36.5 114 1 7 0 10 55 00 11 17 00 --- 12 59 13 28.2 138.5 -2.5 -32.9 1320 F 1 17600 11 19 00 1524-136 13 01 13 28.5 138.9 -2.4 -32.6 114 1 8 17600 11 19 00 11 41 00 --- 13 23 17 31.2 144.3 -2.1 -28.6 1320 R 1 0 11 43 00 1524-136 13 25 17 31.4 144.8 -2.0 -28.2 114 1 9 0 11 43 00 12 05 00 --- 13 47 21 33.8 150.5 -1.7 -23.8 1320 F 1 17600 12 07 00 1524-136 13 49 21 34.0 151.0 -1.6 -23.4 114 1 10 17600 12 07 00 12 29 00 --- 14 11 25 35.9 157.1 -1.3 -18.6 1320 R 1 0 Schedule for VLBA_OV (Code Ov ) Page 3 Helical structure in B1524-136 jets UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Sat 14 Feb 2004 Day 45 --- 12 31 00 1642+690 14 13 25 52.4 20.9 -2.5 -127.9 23 1 11 0 12 31 00 12 35 00 --- 14 17 26 52.7 20.5 -2.4 -129.1 240 F 1 3200 ----------- Tape Change ------------ 12 37 00 1524-136 14 19 26 36.5 159.4 -1.1 -16.8 21 2 1 0 12 37 00 12 55 00 --- 14 37 29 37.6 164.7 -0.8 -12.5 1080 F 1 14400 12 57 00 1524-136 14 39 29 37.7 165.3 -0.8 -12.0 114 2 2 17600 12 57 00 13 19 00 --- 15 01 33 38.5 172.0 -0.4 -6.5 1320 R 1 0 13 21 00 1524-136 15 03 33 38.6 172.6 -0.4 -6.0 114 2 3 0 13 21 00 13 43 00 --- 15 25 37 38.9 179.5 0.0 -0.4 1320 F 1 17600 13 45 00 1524-136 15 27 37 38.9 180.1 0.0 0.1 114 2 4 17600 13 45 00 14 07 00 --- 15 49 41 38.6 187.0 0.4 5.7 1320 R 1 0 14 09 00 1524-136 15 51 41 38.6 187.6 0.4 6.2 114 2 5 0 14 09 00 14 31 00 --- 16 13 45 37.7 194.3 0.8 11.7 1320 F 1 17600 14 33 00 1642+690 16 15 45 58.1 364.5 -0.4 -170.0 1 2 6 17600 14 33 00 14 37 00 --- 16 19 46 58.2 363.8 -0.4 -171.6 240 R 1 14400 14 39 00 1524-136 16 21 46 37.3 196.7 0.9 13.7 3 2 6 14400 14 39 00 14 57 00 --- 16 39 49 36.1 202.0 1.2 17.9 1080 R 1 0 14 59 00 1524-136 16 41 49 36.0 202.6 1.2 18.3 114 2 7 0 14 59 00 15 21 00 --- 17 03 53 34.1 208.7 1.6 23.2 1320 F 1 17600 15 23 00 1524-136 17 05 53 33.9 209.2 1.6 23.6 114 2 8 17600 15 23 00 15 45 00 --- 17 27 57 31.5 214.9 2.0 28.0 1320 R 1 0 15 47 00 1524-136 17 29 57 31.3 215.4 2.0 28.4 114 2 9 0 15 47 00 16 09 00 --- 17 52 01 28.6 220.8 2.4 32.4 1320 F 1 17600 16 11 00 1524-136 17 54 01 28.3 221.2 2.4 32.7 114 2 10 17600 16 11 00 16 33 00 --- 18 16 05 25.3 226.2 2.8 36.3 1320 R 1 0 16 35 00 1642+690 18 18 05 55.7 345.0 1.6 144.9 35 2 11 0 16 35 00 16 39 00 --- 18 22 06 55.5 344.4 1.7 143.6 240 F 1 3200 16 41 00 1524-136 18 24 06 24.1 227.9 2.9 37.5 36 2 11 3200 16 41 00 16 59 00 --- 18 42 09 21.4 231.6 3.2 40.0 1080 F 1 17600 Schedule for VLBA_OV (Code Ov ) Page 4 Helical structure in B1524-136 jets UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Sat 14 Feb 2004 Day 45 --- 17 01 00 1524-136 18 44 09 21.1 232.0 3.3 40.3 114 2 12 17600 17 01 00 17 23 00 --- 19 06 13 17.5 236.2 3.7 43.0 1320 R 1 0 17 25 00 1524-136 19 08 13 17.2 236.6 3.7 43.2 114 2 13 0 17 25 00 17 47 00 --- 19 30 17 13.4 240.6 4.1 45.6 1320 F 1 17600 17 49 00 1524-136 19 32 17 13.1 240.9 4.1 45.8 114 2 14 17600 17 49 00 18 11 00 --- 19 54 21 9.2 244.7 4.5 47.8 1320 R 1 0 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: /irasoft/sched/setups/v6cm-256-8-2-L.set Matches group v6cm_2 in /irasoft/sched/catalogs/freq.dat Setup group: 9 Station: VLBA Total bit rate: 256 Format: VLBA1:2 Bits per sample: 2 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 1.00 Tape speeds: Low density - 266.660 ips, High density - 160.00 ips Time per pass for 17600 ft, High density tapes is: 00:22:00 1st LO= 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 Net SB= U U U U U U U U Pol. = LCP LCP LCP LCP LCP LCP LCP LCP BBC = 1 2 3 4 5 6 7 8 BBC SB= U U U U U U U U IF = C C C C C C C C VLBA FE= 6cm omit 6cm omit VLBA Synth= 15.4 4.1 15.4 The following frequency sets based on this setup were used. Frequency Set: 9 Setup file default. Used pcal sets: 1 LO sum= 4960.49 4968.49 4976.49 4984.49 4992.49 5000.49 5008.49 5016.49 BBC fr= 860.49 868.49 876.49 884.49 892.49 900.49 908.49 916.49 Bandwd= 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_off SOURCE LIST -- Helical structure in B1524-136 jets Catalog positions marked with *. Precession of date coordinates is based on stop time of first scan. Names used in schedule marked with *. Short names used in VLA and SNAP files marked with +. Observation date used in B1950/J2000 coordinate conversion (PRECDATE): 1979.900 No adjustments are made for rates (DRA, DDEC). Source Source position (RA/Dec) (B1950) (J2000) (Date) * 3C273 12 26 33.245804 * 12 29 06.699700 12 29 19.603680 02 19 43.30550 * 02 03 08.59800 02 01 43.01229 From catalog imbedded in main SCHED input file. * OQ208 14 04 45.615152 * 14 07 00.394411 14 07 11.612080 28 41 29.23491 * 28 27 14.68994 28 25 50.05163 From catalog imbedded in main SCHED input file. * 1524-136 15 24 12.880517 * 15 26 59.450000 15 27 12.385859 -13 40 34.86530 *-13 51 00.10000 -13 51 55.45989 From catalog imbedded in main SCHED input file. J1638+5720 16 37 17.425178 * 16 38 13.456293 16 38 17.324466 * 1637+574 57 26 15.76147 * 57 20 23.97918 57 19 31.14683 J1638+57 /irasoft/sched/catalogs/sources.vlba ICRF - Ext.1 Source - 1998 IERS Annual Report J1642+3948 16 41 17.606214 * 16 42 58.809952 16 43 06.266114 1641+399 39 54 10.81489 * 39 48 36.99395 39 47 47.97809 * 3C345 /irasoft/sched/catalogs/sources.vlba J1642+39 ICRF - Ext.1 Source - 1998 IERS Annual Report J1642+6856 16 42 18.064884 * 16 42 07.848514 16 42 06.279838 * 1642+690 69 02 13.21712 * 68 56 39.75640 68 55 47.71872 J1642+68 /irasoft/sched/catalogs/sources.vlba ICRF - Ext.1 Source - 1998 IERS Annual Report The solar corona can cause unstable phases for sources too close to the Sun. SCHED provides warnings at individual scans for distances less than 10 degrees. The distance from the Sun to each source in this schedule is: Source Sun distance (deg) 3C273 138.9 OQ208 118.5 1524-136 92.1 1637+574 94.6 3C345 88.4 1642+690 97.6 Barry Clark estimates from predictions by Ketan Desai of IPM scattering sizes that the Sun will cause amplitude reductions on the longest VLBA baselines at a solar distance of 60deg F^(-0.6) where F is in GHz. For common VLBI bands, this is: 327 MHz 117. deg 610 MHz 81. deg 1.6 GHz 45. deg 2.3 GHz 36. deg 5.0 GHz 23. deg 8.4 GHz 17. deg 15.0 GHz 12. deg 22.0 GHz 9. deg 43.0 GHz 6. deg