COVER INFORMATION Station: TIANMA65 (Code T6 ) Experiment: 6cm global VLBI observations of the starburst galaxy Arp 220 Exp. Code: gv028a Schedule Version: 4.00 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 exclude outer 3 stations for each arm. 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 exclude outer 3 stations on each arm, to get C-array synthesized beam size. EF: Gaps for pointing at : end of scan 56 at 03:18:10 UT to start of scan 59 at 03:26:46 end of scan 120 at 06:45:37 UT to start of scan 124 at 06:54:19 end of scan 188 at 09:46:29 UT to start of scan 191 at 09:54:39 Schedule for TIANMA65 (Code T6 ) Page 2 6cm 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 ---------------------------------------------------------------------------------------- --- Sat 25 Feb 2023 Day 56 --- Next scan frequencies: 4772.00 4772.00 4772.00 4772.00 4836.00 4836.00 4836.00 4836.00 4900.00 4900.00 4900.00 4900.00 4964.00 4964.00 4964.00 4964.00 Next BBC frequencies: 572.00 572.00 572.00 572.00 636.00 636.00 636.00 636.00 700.00 700.00 700.00 700.00 764.00 764.00 764.00 764.00 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 00 00 00 J1516+1932 18 22 57 46.9 265.7 3.1 64.9 0 0 00 00 00 00 05 00 =1514+197 18 27 58 45.9 266.4 3.2 65.0 300 77 00 00 01 00 07 23 OQ208 18 30 21 33.8 285.3 4.4 69.8 94 77 00 07 23 00 12 23 --- 18 35 22 32.8 285.7 4.5 69.5 300 155 00 07 24 00 14 35 J1532+2344 18 37 34 48.8 271.3 3.1 69.2 65 155 00 14 35 00 16 05 =1530+239 18 39 04 48.5 271.5 3.1 69.2 90 178 00 14 36 00 16 31 ARP220 18 39 31 48.8 270.9 3.1 68.9 23 178 00 16 31 00 20 31 --- 18 43 32 47.9 271.4 3.1 68.9 240 240 00 16 32 00 20 58 J1532+2344 18 43 59 47.4 272.1 3.2 69.1 23 240 00 20 58 00 22 28 =1530+239 18 45 29 47.1 272.2 3.2 69.1 90 263 00 20 59 00 22 54 ARP220 18 45 55 47.4 271.7 3.2 68.9 23 263 00 22 54 00 26 54 --- 18 49 56 46.6 272.2 3.2 68.8 240 325 00 22 55 00 27 21 J1532+2344 18 50 23 46.1 272.8 3.3 69.0 23 325 00 27 21 00 28 51 =1530+239 18 51 53 45.8 273.0 3.3 69.0 90 348 00 27 22 00 29 18 ARP220 18 52 20 46.0 272.5 3.3 68.8 23 348 00 29 18 00 33 18 --- 18 56 20 45.2 273.0 3.3 68.7 240 410 00 29 19 00 33 45 J1532+2344 18 56 47 44.7 273.6 3.4 68.9 23 410 00 33 45 00 35 15 =1530+239 18 58 18 44.4 273.7 3.4 68.9 90 433 00 33 46 00 35 41 ARP220 18 58 44 44.7 273.2 3.4 68.7 23 433 00 35 41 00 39 41 --- 19 02 45 43.8 273.7 3.4 68.6 240 495 00 35 42 00 40 08 J1532+2344 19 03 12 43.3 274.3 3.5 68.8 23 495 00 40 08 00 41 38 =1530+239 19 04 42 43.0 274.5 3.5 68.8 90 518 00 40 09 00 42 04 ARP220 19 05 08 43.3 274.0 3.5 68.6 23 518 00 42 04 00 46 04 --- 19 09 09 42.4 274.4 3.6 68.5 240 580 00 42 05 00 46 31 J1532+2344 19 09 36 42.0 275.0 3.6 68.6 23 580 00 46 31 00 48 01 =1530+239 19 11 06 41.6 275.2 3.6 68.6 90 603 00 46 32 Schedule for TIANMA65 (Code T6 ) Page 3 6cm 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 ---------------------------------------------------------------------------------------- --- Sat 25 Feb 2023 Day 56 --- 00 48 28 ARP220 19 11 33 41.9 274.7 3.6 68.4 23 603 00 48 28 00 52 28 --- 19 15 33 41.1 275.2 3.7 68.3 240 665 00 48 29 00 52 55 J1532+2344 19 16 00 40.6 275.7 3.7 68.5 23 665 00 52 55 00 54 25 =1530+239 19 17 31 40.3 275.9 3.7 68.4 90 688 00 52 56 00 54 51 ARP220 19 17 57 40.6 275.4 3.7 68.3 23 688 00 54 51 00 58 51 --- 19 21 58 39.7 275.9 3.8 68.2 240 750 00 54 52 00 59 18 J1532+2344 19 22 25 39.2 276.5 3.8 68.3 23 750 00 59 18 01 00 48 =1530+239 19 23 55 38.9 276.6 3.8 68.2 90 773 00 59 19 01 01 14 ARP220 19 24 22 39.2 276.1 3.8 68.1 23 773 01 01 14 01 05 14 --- 19 28 22 38.4 276.6 3.9 68.0 240 835 01 01 15 01 05 41 J1532+2344 19 28 49 37.9 277.1 3.9 68.1 23 835 01 05 41 01 07 11 =1530+239 19 30 19 37.6 277.3 3.9 68.0 90 858 01 05 42 01 09 26 OQ208 19 32 34 21.2 291.1 5.4 65.2 68 858 01 09 26 01 14 26 --- 19 37 35 20.2 291.6 5.5 64.7 300 935 01 09 27 01 16 35 J1532+2344 19 39 44 35.6 278.3 4.1 67.7 65 935 01 16 35 01 18 05 =1530+239 19 41 15 35.2 278.5 4.1 67.6 90 958 01 16 36 01 18 31 ARP220 19 41 41 35.5 278.0 4.1 67.5 23 958 01 18 31 01 22 31 --- 19 45 42 34.7 278.5 4.2 67.4 240 1020 01 18 32 01 22 58 J1532+2344 19 46 09 34.2 279.0 4.2 67.4 23 1020 01 22 58 01 24 28 =1530+239 19 47 39 33.9 279.2 4.2 67.4 90 1043 01 22 59 01 24 54 ARP220 19 48 05 34.2 278.7 4.2 67.3 23 1043 01 24 54 01 28 54 --- 19 52 06 33.3 279.2 4.3 67.1 240 1105 01 24 55 01 29 21 J1532+2344 19 52 33 32.9 279.7 4.3 67.2 23 1105 01 29 21 01 30 51 =1530+239 19 54 03 32.5 279.8 4.3 67.1 90 1128 01 29 22 01 31 17 ARP220 19 54 29 32.8 279.4 4.3 67.0 23 1128 01 31 17 01 35 17 --- 19 58 30 32.0 279.8 4.4 66.9 240 1190 01 31 18 01 35 44 J1532+2344 19 58 57 31.5 280.4 4.4 66.9 23 1190 01 35 44 01 37 14 =1530+239 20 00 27 31.2 280.5 4.4 66.8 90 1213 01 35 45 01 37 41 ARP220 20 00 54 31.5 280.1 4.4 66.8 23 1213 01 37 41 01 41 41 --- 20 04 54 30.6 280.5 4.5 66.6 240 1275 01 37 42 Schedule for TIANMA65 (Code T6 ) Page 4 6cm 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 ---------------------------------------------------------------------------------------- --- Sat 25 Feb 2023 Day 56 --- 01 42 07 J1532+2344 20 05 21 30.2 281.0 4.5 66.6 23 1275 01 42 07 01 43 37 =1530+239 20 06 52 29.8 281.2 4.6 66.5 90 1298 01 42 08 01 44 04 ARP220 20 07 18 30.1 280.8 4.5 66.5 23 1298 01 44 04 01 48 04 --- 20 11 19 29.3 281.2 4.6 66.3 240 1360 01 44 05 01 48 30 J1532+2344 20 11 45 28.8 281.7 4.6 66.3 23 1360 01 48 30 01 50 00 =1530+239 20 13 16 28.5 281.9 4.7 66.2 90 1384 01 48 31 01 50 27 ARP220 20 13 42 28.8 281.4 4.6 66.2 23 1384 01 50 27 01 54 27 --- 20 17 43 27.9 281.9 4.7 66.0 240 1445 01 50 28 01 54 53 J1532+2344 20 18 09 27.5 282.4 4.7 65.9 23 1445 01 54 53 01 56 23 =1530+239 20 19 40 27.2 282.5 4.8 65.9 90 1469 01 54 54 01 56 50 ARP220 20 20 06 27.4 282.1 4.7 65.8 23 1469 01 56 50 02 00 50 --- 20 24 07 26.6 282.5 4.8 65.6 240 1530 01 56 51 02 01 16 J1532+2344 20 24 34 26.1 283.1 4.8 65.6 23 1530 02 01 16 02 02 46 =1530+239 20 26 04 25.8 283.2 4.9 65.5 90 1554 02 01 17 02 03 13 ARP220 20 26 30 26.1 282.8 4.8 65.5 23 1554 02 03 13 02 07 13 --- 20 30 31 25.3 283.2 4.9 65.3 240 1615 02 03 14 02 07 39 J1532+2344 20 30 58 24.8 283.7 5.0 65.2 23 1615 02 07 39 02 09 09 =1530+239 20 32 28 24.5 283.9 5.0 65.2 90 1639 02 07 40 02 18 16 J1532+2344 20 41 35 22.6 284.9 5.1 64.6 544 1639 02 18 16 02 19 46 =1530+239 20 43 06 22.3 285.0 5.2 64.5 90 1662 02 18 17 02 20 12 ARP220 20 43 32 22.5 284.6 5.1 64.6 23 1662 02 20 12 02 24 12 --- 20 47 33 21.7 285.0 5.2 64.3 240 1724 02 20 13 02 24 38 J1532+2344 20 47 59 21.3 285.5 5.2 64.2 23 1724 02 24 38 02 26 08 =1530+239 20 49 29 21.0 285.7 5.3 64.2 90 1747 02 24 39 02 26 34 ARP220 20 49 56 21.2 285.3 5.2 64.2 23 1747 02 26 34 02 30 34 --- 20 53 56 20.4 285.7 5.3 63.9 240 1809 02 26 35 02 31 01 J1532+2344 20 54 23 20.0 286.2 5.3 63.8 23 1809 02 31 01 02 32 31 =1530+239 20 55 53 19.6 286.4 5.4 63.8 90 1832 02 31 02 02 32 57 ARP220 20 56 19 19.9 286.0 5.3 63.8 23 1832 02 32 57 02 36 57 --- 21 00 20 19.1 286.4 5.4 63.5 240 1894 02 32 58 Schedule for TIANMA65 (Code T6 ) Page 5 6cm 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 ---------------------------------------------------------------------------------------- --- Sat 25 Feb 2023 Day 56 --- 02 37 24 J1532+2344 21 00 47 18.6 286.9 5.5 63.4 23 1894 02 37 24 02 38 54 =1530+239 21 02 17 18.3 287.1 5.5 63.3 90 1917 02 37 25 02 39 20 ARP220 21 02 43 18.6 286.7 5.4 63.4 23 1917 02 39 20 02 43 20 --- 21 06 44 17.8 287.1 5.5 63.1 240 1979 02 39 21 02 43 47 J1532+2344 21 07 11 17.3 287.6 5.6 63.0 24 1979 02 43 47 02 45 17 =1530+239 21 08 41 17.0 287.8 5.6 62.9 90 2002 02 43 48 02 45 43 ARP220 21 09 07 17.3 287.4 5.6 63.0 23 2002 02 45 43 02 49 43 --- 21 13 08 16.5 287.8 5.6 62.7 240 2064 02 45 44 02 50 10 J1532+2344 21 13 35 16.0 288.3 5.7 62.6 24 2064 02 50 10 02 51 40 =1530+239 21 15 05 15.7 288.5 5.7 62.5 90 2087 02 50 11 02 52 06 ARP220 21 15 31 16.0 288.1 5.7 62.5 23 2087 02 52 06 02 56 06 --- 21 19 32 15.2 288.5 5.7 62.2 240 2149 02 52 07 02 56 34 J1532+2344 21 20 00 14.7 289.0 5.8 62.1 24 2149 02 56 34 02 58 04 =1530+239 21 21 30 14.4 289.2 5.8 62.0 90 2172 02 56 35 02 58 30 ARP220 21 21 56 14.7 288.8 5.8 62.1 23 2172 02 58 30 03 02 30 --- 21 25 57 13.9 289.2 5.8 61.8 240 2234 02 58 31 03 02 58 J1532+2344 21 26 25 13.4 289.7 5.9 61.6 24 2234 03 02 58 03 04 28 =1530+239 21 27 55 13.1 289.9 5.9 61.5 90 2257 03 02 59 03 04 54 ARP220 21 28 22 13.4 289.5 5.9 61.6 23 2257 03 04 54 03 08 54 --- 21 32 22 12.6 289.9 5.9 61.3 240 2319 03 04 55 03 09 22 J1532+2344 21 32 51 12.1 290.5 6.0 61.2 25 2319 03 09 22 03 10 52 =1530+239 21 34 21 11.8 290.6 6.0 61.0 90 2342 03 09 23 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess123.C2048glob --- 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: 22 Station: TIANMA65 Total bit rate: 2048 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 16 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 Net SB= L L U U L L U U L L U U L L U U IF SB = U U U U U U U U U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 5 1 5 2 6 2 6 3 7 3 7 4 8 4 8 BBC SB= L L U U L L U U L L U U L L U U IF = A4 B3 A4 B3 A4 B3 A4 B3 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= 4772.00 4772.00 4772.00 4772.00 4836.00 4836.00 4836.00 4836.00 4900.00 4900.00 4900.00 4900.00 4964.00 4964.00 4964.00 4964.00 BBC fr= 572.00 572.00 572.00 572.00 636.00 636.00 636.00 636.00 700.00 700.00 700.00 700.00 764.00 764.00 764.00 764.00 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 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, 9, 10, 11, 12, 13, 14, 15, 16 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 57.471629 0.00 23 40 07.75728 * 23 30 11.33000 23 25 19.21788 0.00 From catalog imbedded in main SCHED input file. * 3C286 13 28 49.657769 * 13 31 08.288061 13 32 13.126184 0.17 J1331+3030 30 45 58.64066 * 30 30 32.95930 30 23 12.11724 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 03.247708 0.24 J1407+2827 28 41 29.23515 * 28 27 14.69019 28 20 25.36264 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 17 59.616614 0.01 * J1516+1932 19 43 10.94247 * 19 32 12.99203 19 26 54.09145 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 46.540710 0.08 * J1532+2344 23 54 09.32913 * 23 44 05.26796 23 39 09.62699 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.C2048glob 1 2 3 4 5 6 7 8 9 10 11 12 + 9.667 1337.178 3C286 sess123.C2048glob 18 0.067 0.000 OQ208 sess123.C2048glob 1 2 3 4 5 6 7 8 9 10 11 12 + 1.417 185.263 J1516+1932 sess123.C2048glob 1 2 3 4 5 6 7 8 9 10 11 12 + 0.083 11.333 J1532+2344 sess123.C2048glob 1 2 3 4 5 6 7 8 9 10 11 12 + 4.089 538.617 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 106.6 3C286 133.2 OQ208 126.1 J1516+1932 110.6 J1532+2344 107.1 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