COVER INFORMATION Station: VLBA_OV (Code Ov ) Experiment: Confirming the first detection of a merging dual SMBH system at high-z Exp. Code: gs044a Schedule Version: 2.00 Processed by SCHED version: 11.50 Development version 11.5. Started Apr. 2 PI: Cristiana Spingola Address: University of Bologna - INAF-IRA via Gobetti 101 40129 Bologna Italy Phone: +39 3938231373 EMAIL: spingola@ira.inaf.it Fax: Phone during observation: Observing mode: Notes: v2: T6 IF C->B, BBC 9-12 -> 5-8 Ar confirms BBC tunings for their RDBE COVER LETTER: Schedule for VLBA_OV (Code Ov ) Page 2 Confirming the first detection of a merging dual SMBH system at high-z UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Sat 26 Oct 2019 Day 299 --- Next scan frequencies: 4860.25 4860.25 4892.25 4892.25 4924.25 4924.25 4956.25 4956.25 Next BBC frequencies: 760.25 760.25 792.25 792.25 824.25 824.25 856.25 856.25 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 19 36 10 MG2016 14 02 37 3.5 78.2 -6.3 H -52.7 0 0 19 36 10 19 39 40 --- 14 06 07 4.2 78.7 -6.2 H -52.8 0 27 19 36 11 19 39 40 J2018+0831 14 06 07 2.6 81.2 -6.2 H -52.7 -11 27 19 39 51 19 41 10 --- 14 07 38 2.9 81.4 -6.2 H -52.8 0 37 19 39 41 19 41 10 MG2016 14 07 38 4.5 78.9 -6.2 H -52.9 -11 37 19 41 21 19 44 40 --- 14 11 08 5.2 79.4 -6.2 H -53.0 0 63 19 41 11 19 45 20 J2018+0831 14 11 48 3.7 82.0 -6.1 H -52.9 29 63 19 45 20 19 46 20 --- 14 12 48 3.9 82.2 -6.1 H -52.9 0 71 19 45 21 19 46 20 MG2016 14 12 48 5.5 79.7 -6.1 H -53.1 -11 71 19 46 31 19 49 50 --- 14 16 19 6.2 80.2 -6.1 H -53.2 0 96 19 46 21 19 49 50 J2018+0831 14 16 19 4.6 82.7 -6.0 H -53.0 -11 96 19 50 01 19 51 20 --- 14 17 49 4.9 82.9 -6.0 H -53.0 0 106 19 49 51 19 51 20 MG2016 14 17 49 6.5 80.4 -6.0 H -53.2 -11 106 19 51 31 19 54 50 --- 14 21 20 7.2 80.9 -6.0 H -53.4 0 132 19 51 21 19 55 30 J2018+0831 14 22 00 5.8 83.6 -6.0 H -53.1 29 132 19 55 30 19 56 30 --- 14 23 00 6.0 83.7 -5.9 H -53.2 0 140 19 55 31 19 56 30 MG2016 14 23 00 7.5 81.2 -6.0 H -53.4 -11 140 19 56 41 20 00 00 --- 14 26 31 8.2 81.7 -5.9 H -53.5 0 165 19 56 31 20 00 00 J2018+0831 14 26 31 6.6 84.2 -5.9 H -53.2 -11 165 20 00 11 20 01 30 --- 14 28 01 6.9 84.5 -5.9 H -53.3 0 176 20 00 01 20 01 30 MG2016 14 28 01 8.5 81.9 -5.9 H -53.6 -11 176 20 01 41 20 05 00 --- 14 31 31 9.2 82.4 -5.8 H -53.7 0 201 20 01 31 20 05 40 J2018+0831 14 32 12 7.8 85.1 -5.8 H -53.3 29 201 20 05 40 20 06 40 --- 14 33 12 8.0 85.2 -5.8 H -53.4 0 209 20 05 41 20 06 40 MG2016 14 33 12 9.5 82.7 -5.8 -53.7 -11 209 20 06 51 20 10 10 --- 14 36 42 10.2 83.2 -5.7 -53.8 199 235 20 06 41 20 10 10 J2018+0831 14 36 42 8.7 85.8 -5.7 H -53.4 -11 235 20 10 21 20 11 40 --- 14 38 13 9.0 86.0 -5.7 -53.4 0 245 20 10 11 Schedule for VLBA_OV (Code Ov ) Page 3 Confirming the first detection of a merging dual SMBH system at high-z UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Sat 26 Oct 2019 Day 299 --- 20 11 40 MG2016 14 38 13 10.5 83.4 -5.7 -53.8 -11 245 20 11 51 20 15 10 --- 14 41 43 11.2 83.9 -5.6 -53.9 199 270 20 11 41 20 15 50 J2018+0831 14 42 23 9.8 86.6 -5.6 -53.5 29 270 20 15 50 20 16 50 --- 14 43 23 10.0 86.8 -5.6 -53.5 60 278 20 15 51 20 16 50 MG2016 14 43 23 11.5 84.2 -5.6 -53.9 -11 278 20 17 01 20 20 20 --- 14 46 54 12.2 84.7 -5.6 -54.0 199 304 20 16 51 20 20 20 J2018+0831 14 46 54 10.7 87.3 -5.5 -53.5 -11 304 20 20 31 20 21 50 --- 14 48 24 11.0 87.5 -5.5 -53.6 79 314 20 20 21 20 21 50 MG2016 14 48 24 12.5 84.9 -5.5 -54.0 -11 314 20 22 01 20 25 20 --- 14 51 55 13.2 85.4 -5.5 -54.1 199 340 20 21 51 20 26 00 J2018+0831 14 52 35 11.8 88.1 -5.4 -53.6 29 340 20 26 00 20 27 00 --- 14 53 35 12.0 88.3 -5.4 -53.6 60 347 20 26 01 20 27 00 MG2016 14 53 35 13.5 85.7 -5.4 -54.1 -11 347 20 27 11 20 30 30 --- 14 57 06 14.2 86.2 -5.4 -54.2 199 373 20 27 01 20 30 30 J2018+0831 14 57 06 12.7 88.8 -5.4 -53.6 -11 373 20 30 41 20 32 00 --- 14 58 36 13.0 89.0 -5.3 -53.6 79 383 20 30 31 20 32 00 MG2016 14 58 36 14.5 86.4 -5.4 -54.2 -11 383 20 32 11 20 35 30 --- 15 02 06 15.2 87.0 -5.3 -54.2 199 409 20 32 01 20 36 10 J2018+0831 15 02 47 13.9 89.7 -5.3 -53.6 29 409 20 36 10 20 37 10 --- 15 03 47 14.1 89.8 -5.3 -53.6 60 416 20 36 11 20 37 10 MG2016 15 03 47 15.6 87.2 -5.3 -54.3 -11 416 20 37 21 20 40 40 --- 15 07 17 16.3 87.7 -5.2 -54.3 199 442 20 37 11 20 41 20 J2018+0831 15 07 57 14.9 90.4 -5.2 -53.6 29 442 20 41 20 20 42 20 --- 15 08 58 15.1 90.6 -5.2 -53.6 60 450 20 41 21 20 42 20 MG2016 15 08 58 16.6 88.0 -5.2 -54.3 -11 450 20 42 31 20 45 50 --- 15 12 28 17.3 88.5 -5.1 -54.3 199 475 20 42 21 20 45 50 J2018+0831 15 12 28 15.8 91.1 -5.1 -53.6 -11 475 20 46 01 20 47 20 --- 15 13 58 16.1 91.4 -5.1 -53.6 79 486 20 45 51 20 47 20 MG2016 15 13 58 17.6 88.7 -5.1 -54.3 -11 486 20 47 31 20 50 50 --- 15 17 29 18.3 89.3 -5.0 -54.3 199 511 20 47 21 Schedule for VLBA_OV (Code Ov ) Page 4 Confirming the first detection of a merging dual SMBH system at high-z UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Sat 26 Oct 2019 Day 299 --- 20 51 30 J2018+0831 15 18 09 16.9 92.0 -5.0 -53.6 29 511 20 51 30 20 52 30 --- 15 19 09 17.1 92.2 -5.0 -53.6 60 519 20 51 31 20 52 30 MG2016 15 19 09 18.6 89.5 -5.0 -54.3 -11 519 20 52 41 20 56 00 --- 15 22 40 19.3 90.0 -5.0 -54.3 199 545 20 52 31 20 56 30 J2018+0831 15 23 10 17.9 92.8 -4.9 -53.5 19 545 20 56 30 21 00 00 --- 15 26 41 18.6 93.3 -4.9 -53.5 210 572 20 56 31 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess319.C1024glob Matching groups in /home/guest/rmc/SCHED/sched11.5/catalogs/freq_RDBE.dat: vc_d Setup group: 9 Station: VLBA_OV Total bit rate: 1024 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 8 DBE type: RDBE_DDC Speedup factor: 1.00 Disk used to record data. 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 IF SB = U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 2 3 4 5 6 7 8 BBC SB= U U U U U U U U IF = A C A C A C A C VLBA FE= 6cm omit 6cm omit VLBA Synth= 13.6 4.1 13.6 The following frequency sets based on these setups were used. See the crd files for VLBA legacy system setups and pcal detection details. Frequency Set: 15 Setup file default. Used with PCAL = off LO sum= 4860.25 4860.25 4892.25 4892.25 4924.25 4924.25 4956.25 4956.25 BBC fr= 760.25 760.25 792.25 792.25 824.25 824.25 856.25 856.25 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 VLBA legacy crd files using 4 channels based on RDBE channels: 3 4 5 6 CRD fr= 800.25 800.25 832.25 832.25 CRD bw= 16.00 16.00 16.00 16.00 Matching frequency sets: 15 16 18 19 20 21 22 23 24 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * MG2016 20 16 55.378166 * 20 19 18.092000 20 20 13.565900 0.00 11 17 44.97966 * 11 27 13.00000 11 31 08.04992 0.00 From catalog imbedded in main SCHED input file. * 3C345 16 41 17.606162 * 16 42 58.809900 16 43 36.764649 0.00 39 54 10.81394 * 39 48 36.99300 39 46 42.73413 0.00 From catalog imbedded in main SCHED input file. * J2018+0831 20 15 45.733430 * 20 18 11.311946 20 19 07.886706 0.00 08 22 30.62230 * 08 31 54.54739 08 35 47.14317 0.00 From catalog imbedded in main SCHED input file. SOURCE SCAN SUMMARY FOR SOURCES LISTED ABOVE Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Setup file Frequency sets Observing hours (duplicates not shown) Scan Baseline MG2016 sess319.C1024glob 1 2 3 4 5 6 7 8 9 10 11 15 + 6.650 489.300 3C345 sess319.C1024glob 1 2 3 4 5 6 7 8 9 10 11 0.225 6.793 J2018+0831 sess319.C1024glob 1 2 3 4 5 6 7 8 9 10 11 15 + 2.525 164.241 EFFECT OF SOLAR CORONA 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) MG2016 96.6 3C345 64.2 J2018+0831 95.8 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