COVER INFORMATION Station: TIANMA65 (Code T6 ) Experiment: 18cm global VLBI observations of the starburst galaxy Arp 220 Exp. Code: gv028c Schedule Version: 2.00 Processed by SCHED version: 11.60 Release 11.6; April 2020 PI: Eskil Varenius Address: Chalmers University of Technology Onsala Space Observatory 439 92 Onsala Sweden Phone: +46706755341 EMAIL: eskil.varenius@chalmers.se Fax: Phone during observation: +46706755341 Observing mode: vlbi Notes: VLA please use all 27 stations at 18cm. Phase calibrator: J1532+2344 Fringe finder: J1516+1932 Pol. cal.: OQ208 COVER LETTER: This is one of three .key files to observe Arp 220 at 18cm, 6cm and 3.6cm during EVN session I 2023. Arp 220 has two nuclei 1 arcsec apart; we aim to point right in the middle of them, to get both at the same time. OPERATOR NOTES: VLA27: Please use all 27 stations at 18cm. Schedule for TIANMA65 (Code T6 ) Page 2 18cm global VLBI observations of the starburst galaxy Arp 220 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 ---------------------------------------------------------------------------------------- --- Sun 12 Mar 2023 Day 71 --- Next scan frequencies: 1626.00 1626.00 1626.00 1626.00 1690.00 1690.00 1690.00 1690.00 Next BBC frequencies: 644.00 644.00 644.00 644.00 580.00 580.00 580.00 580.00 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 22 30 00 J1516+1932 17 55 47 52.7 261.4 2.6 63.9 0 0 22 30 00 22 35 00 =1514+197 18 00 48 51.6 262.2 2.7 64.1 300 39 22 30 01 22 37 23 OQ208 18 03 12 39.5 282.8 3.9 71.6 94 39 22 37 23 22 42 23 --- 18 08 12 38.4 283.2 4.0 71.3 300 77 22 37 24 22 44 35 J1532+2344 18 10 24 54.6 267.7 2.6 69.1 64 77 22 44 35 22 46 05 =1530+239 18 11 54 54.3 267.9 2.6 69.1 90 89 22 44 36 22 46 31 ARP220 18 12 21 54.6 267.3 2.6 68.8 23 89 22 46 31 22 57 01 --- 18 22 53 52.3 268.8 2.8 68.9 630 170 22 46 32 22 57 28 J1532+2344 18 23 20 51.9 269.5 2.8 69.2 23 170 22 57 28 22 58 58 =1530+239 18 24 50 51.5 269.7 2.9 69.2 90 182 22 57 29 22 59 24 ARP220 18 25 16 51.8 269.1 2.8 68.9 23 182 22 59 24 23 09 54 --- 18 35 48 49.6 270.4 3.0 68.9 630 263 22 59 25 23 10 21 J1532+2344 18 36 15 49.1 271.1 3.0 69.2 23 263 23 10 21 23 11 51 =1530+239 18 37 45 48.8 271.3 3.1 69.2 90 274 23 10 22 23 12 18 ARP220 18 38 12 49.1 270.8 3.0 68.9 23 274 23 12 18 23 22 48 --- 18 48 44 46.8 272.1 3.2 68.8 630 356 23 12 19 23 23 15 J1532+2344 18 49 11 46.3 272.7 3.3 69.0 23 356 23 23 15 23 24 45 =1530+239 18 50 41 46.0 272.9 3.3 69.0 90 367 23 23 16 23 25 11 ARP220 18 51 07 46.3 272.3 3.3 68.8 23 367 23 25 11 23 35 41 --- 19 01 39 44.0 273.6 3.4 68.7 630 448 23 25 12 23 36 08 J1532+2344 19 02 06 43.6 274.2 3.5 68.8 23 448 23 36 08 23 37 38 =1530+239 19 03 36 43.2 274.4 3.5 68.8 90 460 23 36 09 23 39 54 OQ208 19 05 52 26.6 288.6 5.0 67.3 68 460 23 39 54 23 44 54 --- 19 10 53 25.5 289.0 5.0 66.9 300 499 23 39 55 23 47 04 J1532+2344 19 13 04 41.2 275.4 3.7 68.5 65 499 23 47 04 23 48 34 =1530+239 19 14 35 40.9 275.6 3.7 68.5 90 510 23 47 05 23 49 01 ARP220 19 15 01 41.2 275.1 3.7 68.4 23 510 23 49 01 23 59 31 --- 19 25 33 39.0 276.3 3.8 68.1 630 591 23 49 02 Schedule for TIANMA65 (Code T6 ) Page 3 18cm global VLBI observations of the starburst galaxy Arp 220 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 ---------------------------------------------------------------------------------------- --- Start: Sun 12 Mar 2023 Day 71 -- Stop: Mon 13 Mar 2023 Day 72 --- 23 59 58 J1532+2344 19 26 00 38.5 276.8 3.9 68.2 23 591 23 59 58 00 01 28 =1530+239 19 27 30 38.2 277.0 3.9 68.1 90 603 23 59 59 00 01 54 ARP220 19 27 56 38.4 276.5 3.9 68.0 23 603 00 01 54 00 12 24 --- 19 38 28 36.2 277.7 4.0 67.6 630 684 00 01 55 00 12 51 J1532+2344 19 38 55 35.7 278.2 4.1 67.7 23 684 00 12 51 00 14 21 =1530+239 19 40 25 35.4 278.4 4.1 67.6 90 696 00 12 52 00 14 47 ARP220 19 40 52 35.7 277.9 4.1 67.6 23 696 00 14 47 00 25 17 --- 19 51 24 33.5 279.1 4.3 67.2 630 777 00 14 48 00 25 44 J1532+2344 19 51 50 33.0 279.6 4.3 67.2 23 777 00 25 44 00 27 14 =1530+239 19 53 21 32.7 279.8 4.3 67.1 90 788 00 25 45 00 27 41 ARP220 19 53 47 33.0 279.3 4.3 67.1 23 788 00 27 41 00 38 11 --- 20 04 19 30.7 280.5 4.5 66.6 630 870 00 27 42 00 38 37 J1532+2344 20 04 46 30.3 281.0 4.5 66.6 23 870 00 38 37 00 40 07 =1530+239 20 06 16 30.0 281.1 4.5 66.5 90 881 00 38 38 00 42 18 OQ208 20 08 27 14.1 294.8 6.0 62.0 66 881 00 42 18 00 47 18 --- 20 13 27 13.1 295.4 6.1 61.5 300 920 00 42 19 00 49 23 J1532+2344 20 15 33 28.0 282.1 4.7 66.1 63 920 00 49 23 00 50 53 =1530+239 20 17 03 27.7 282.3 4.7 66.0 90 931 00 49 24 00 51 19 ARP220 20 17 30 28.0 281.8 4.7 66.0 23 931 00 51 19 01 01 49 --- 20 28 01 25.8 283.0 4.9 65.4 630 1013 00 51 20 01 02 16 J1532+2344 20 28 28 25.3 283.5 4.9 65.4 23 1013 01 02 16 01 03 46 =1530+239 20 29 58 25.0 283.6 4.9 65.3 90 1024 01 02 17 01 04 12 ARP220 20 30 25 25.3 283.2 4.9 65.3 23 1024 01 04 12 01 14 42 --- 20 40 56 23.1 284.3 5.1 64.7 630 1105 01 04 13 01 15 09 J1532+2344 20 41 23 22.6 284.8 5.1 64.6 23 1105 01 15 09 01 16 39 =1530+239 20 42 53 22.3 285.0 5.2 64.6 90 1117 01 15 10 01 17 05 ARP220 20 43 20 22.6 284.6 5.1 64.6 23 1117 01 17 05 01 27 35 --- 20 53 51 20.4 285.7 5.3 63.9 630 1198 01 17 06 01 28 01 J1532+2344 20 54 18 20.0 286.2 5.3 63.9 23 1198 01 28 01 01 29 31 =1530+239 20 55 48 19.7 286.4 5.4 63.8 90 1210 01 28 02 Schedule for TIANMA65 (Code T6 ) Page 4 18cm global VLBI observations of the starburst galaxy Arp 220 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 ---------------------------------------------------------------------------------------- --- Mon 13 Mar 2023 Day 72 --- 01 29 58 ARP220 20 56 14 19.9 286.0 5.3 63.8 23 1210 01 29 58 01 40 28 --- 21 06 46 17.8 287.1 5.5 63.1 630 1291 01 29 59 01 40 54 J1532+2344 21 07 13 17.3 287.6 5.6 63.0 24 1291 01 40 54 01 42 24 =1530+239 21 08 43 17.0 287.8 5.6 62.9 90 1302 01 40 55 01 51 24 J1532+2344 21 17 44 15.2 288.8 5.7 62.3 537 1302 01 51 24 01 52 54 =1530+239 21 19 14 14.9 288.9 5.8 62.2 90 1314 01 51 25 01 53 20 ARP220 21 19 41 15.1 288.5 5.7 62.2 23 1314 01 53 20 02 03 50 --- 21 30 12 13.0 289.7 5.9 61.5 630 1395 01 53 21 02 04 18 J1532+2344 21 30 41 12.6 290.2 5.9 61.3 25 1395 02 04 18 02 05 48 =1530+239 21 32 11 12.3 290.4 6.0 61.2 90 1407 02 04 19 02 06 15 ARP220 21 32 38 12.5 290.0 5.9 61.3 23 1407 02 06 15 02 16 45 --- 21 43 09 10.4 291.2 6.1 60.5 630 1488 02 06 16 02 17 14 J1532+2344 21 43 38 10.0 291.7 6.2 60.3 25 1488 02 17 14 02 18 44 =1530+239 21 45 08 9.7 291.9 6.2 60.2 90 1499 02 17 15 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess123.L1024glob --- WARNING --- This group does not match an entry in the frequency catalog. This might be ok because the catalog is not complete. But be very careful to be sure that the setup is correct. Setup group: 21 Station: TIANMA65 Total bit rate: 1024 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 8 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 2270.00 2270.00 2270.00 2270.00 2270.00 2270.00 2270.00 2270.00 Net SB= L L U U L L U U IF SB = L L L L L L L L Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 5 1 5 2 6 2 6 BBC SB= U U L L U U L L IF = A4 B3 A4 B3 A4 B3 A4 B3 The following frequency sets based on these setups were used. Frequency Set: 7 Setup file default. Used with PCAL = off LO sum= 1626.00 1626.00 1626.00 1626.00 1690.00 1690.00 1690.00 1690.00 BBC fr= 644.00 644.00 644.00 644.00 580.00 580.00 580.00 580.00 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 7 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) * ARP220 15 32 46.905485 * 15 34 57.250000 15 35 57.940194 0.00 23 40 07.75728 * 23 30 11.33000 23 25 18.96580 0.00 From catalog imbedded in main SCHED input file. * 3C286 13 28 49.657769 * 13 31 08.288061 13 32 13.487531 0.17 J1331+3030 30 45 58.64066 * 30 30 32.95930 30 23 13.19246 0.16 1328+307 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc J1331+30 GSFC 2016a X/S astro solution, 269 observations. * OQ208 14 04 45.615156 * 14 07 00.394415 14 08 03.650024 0.24 J1407+2827 28 41 29.23515 * 28 27 14.69019 28 20 26.03181 0.35 1404+286 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc J1407+28 GSFC 2016a X/S astro solution, 68278 observations. 1514+197 15 14 40.985841 * 15 16 56.796164 15 18 00.065612 0.01 * J1516+1932 19 43 10.94247 * 19 32 12.99203 19 26 53.79356 0.02 J1516+19 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 4472 observations. 1530+239 15 30 36.092759 * 15 32 46.345214 15 33 47.008502 0.08 * J1532+2344 23 54 09.32913 * 23 44 05.26796 23 39 09.39949 0.14 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 171 observations. 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 ARP220 sess123.L1024glob 1 2 3 4 5 6 7 8 9 10 11 17 + 12.250 1600.189 3C286 sess123.L1024glob 17 0.133 0.000 OQ208 sess123.L1024glob 1 2 3 4 5 6 7 8 9 10 11 17 + 1.500 188.550 J1516+1932 sess123.L1024glob 1 2 3 4 5 6 7 8 9 10 11 0.083 10.000 J1532+2344 sess123.L1024glob 1 2 3 4 5 6 7 8 9 10 11 17 + 2.183 275.621 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) ARP220 117.8 3C286 140.6 OQ208 135.1 J1516+1932 122.6 J1532+2344 118.2 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