COVER INFORMATION Station: URUMQI (Code Ur ) 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 URUMQI (Code Ur ) 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: 526.00 526.00 526.00 526.00 590.00 590.00 590.00 590.00 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 22 30 00 J1516+1932 15 39 57 65.5 192.6 0.4 9.7 0 0 22 30 00 22 35 00 =1514+197 15 44 58 65.3 195.4 0.4 11.8 300 38 22 30 01 22 37 23 OQ208 15 47 22 65.0 241.0 1.7 46.1 94 38 22 37 23 22 42 23 --- 15 52 22 64.2 242.7 1.7 47.1 300 77 22 37 24 22 44 35 J1532+2344 15 54 34 69.7 193.9 0.3 10.9 78 77 22 44 35 22 46 05 =1530+239 15 56 05 69.7 194.8 0.4 11.7 90 88 22 44 36 22 46 31 ARP220 15 56 31 69.5 193.6 0.3 10.7 21 88 22 46 31 22 57 01 --- 16 07 03 69.0 200.2 0.5 15.9 630 169 22 46 32 22 57 28 J1532+2344 16 07 30 69.0 202.0 0.6 17.3 21 169 22 57 28 22 58 58 =1530+239 16 09 00 68.9 202.9 0.6 18.0 90 181 22 57 29 22 59 24 ARP220 16 09 26 68.8 201.7 0.6 17.0 21 181 22 59 24 23 09 54 --- 16 19 58 68.0 207.9 0.7 21.7 630 262 22 59 25 23 10 21 J1532+2344 16 20 25 68.0 209.6 0.8 23.0 21 262 23 10 21 23 11 51 =1530+239 16 21 55 67.8 210.4 0.8 23.7 90 273 23 10 22 23 12 18 ARP220 16 22 22 67.8 209.2 0.8 22.7 21 273 23 12 18 23 22 48 --- 16 32 54 66.8 214.9 0.9 26.9 630 354 23 12 19 23 23 15 J1532+2344 16 33 21 66.7 216.5 1.0 28.1 22 354 23 23 15 23 24 45 =1530+239 16 34 51 66.5 217.3 1.0 28.7 90 365 23 23 16 23 25 11 ARP220 16 35 17 66.5 216.1 1.0 27.8 21 365 23 25 11 23 35 41 --- 16 45 49 65.3 221.3 1.2 31.4 630 446 23 25 12 23 36 08 J1532+2344 16 46 16 65.2 222.8 1.2 32.6 22 446 23 36 08 23 37 38 =1530+239 16 47 46 65.0 223.5 1.2 33.0 90 458 23 36 09 23 39 54 OQ208 16 50 03 54.3 258.5 2.7 53.9 97 458 23 39 54 23 44 54 --- 16 55 03 53.4 259.6 2.8 54.2 300 496 23 39 55 23 47 04 J1532+2344 16 57 14 63.8 227.6 1.4 35.8 94 496 23 47 04 23 48 34 =1530+239 16 58 45 63.6 228.2 1.4 36.2 90 508 23 47 05 23 49 01 ARP220 16 59 11 63.6 227.2 1.4 35.5 21 508 23 49 01 23 59 31 --- 17 09 43 62.2 231.5 1.6 38.2 630 588 23 49 02 Schedule for URUMQI (Code Ur ) 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 17 10 10 62.0 232.8 1.6 39.1 22 588 23 59 58 00 01 28 =1530+239 17 11 40 61.8 233.3 1.6 39.5 90 600 23 59 59 00 01 54 ARP220 17 12 07 61.8 232.4 1.6 38.8 21 600 00 01 54 00 12 24 --- 17 22 38 60.3 236.2 1.8 41.1 630 681 00 01 55 00 12 51 J1532+2344 17 23 05 60.1 237.4 1.8 41.9 22 681 00 12 51 00 14 21 =1530+239 17 24 35 59.8 237.9 1.8 42.2 90 692 00 12 52 00 14 47 ARP220 17 25 02 59.9 237.0 1.8 41.6 21 692 00 14 47 00 25 17 --- 17 35 34 58.3 240.5 2.0 43.5 630 773 00 14 48 00 25 44 J1532+2344 17 36 01 58.0 241.6 2.0 44.2 22 773 00 25 44 00 27 14 =1530+239 17 37 31 57.8 242.1 2.1 44.4 90 785 00 25 45 00 27 41 ARP220 17 37 57 57.9 241.2 2.0 43.9 22 785 00 27 41 00 38 11 --- 17 48 29 56.2 244.4 2.2 45.5 630 865 00 27 42 00 38 37 J1532+2344 17 48 56 55.9 245.5 2.3 46.1 22 865 00 38 37 00 40 07 =1530+239 17 50 26 55.7 245.9 2.3 46.3 90 877 00 38 38 00 42 18 OQ208 17 52 37 43.0 270.6 3.7 55.5 102 877 00 42 18 00 47 18 --- 17 57 38 42.1 271.4 3.8 55.5 300 915 00 42 19 00 49 23 J1532+2344 17 59 43 54.1 248.4 2.4 47.4 98 915 00 49 23 00 50 53 =1530+239 18 01 13 53.9 248.8 2.5 47.6 90 927 00 49 24 00 51 19 ARP220 18 01 40 54.0 248.1 2.4 47.2 22 927 00 51 19 01 01 49 --- 18 12 11 52.2 250.8 2.6 48.3 630 1008 00 51 20 01 02 16 J1532+2344 18 12 38 51.9 251.7 2.6 48.8 22 1008 01 02 16 01 03 46 =1530+239 18 14 08 51.7 252.1 2.7 48.9 90 1019 01 02 17 01 04 12 ARP220 18 14 35 51.8 251.4 2.6 48.5 22 1019 01 04 12 01 14 42 --- 18 25 06 50.0 253.9 2.8 49.4 630 1100 01 04 13 01 15 09 J1532+2344 18 25 33 49.7 254.7 2.9 49.8 22 1100 01 15 09 01 16 39 =1530+239 18 27 03 49.4 255.1 2.9 50.0 90 1112 01 15 10 01 17 05 ARP220 18 27 30 49.6 254.4 2.9 49.6 22 1112 01 17 05 01 27 35 --- 18 38 01 47.7 256.8 3.0 50.3 630 1192 01 17 06 01 28 01 J1532+2344 18 38 28 47.4 257.6 3.1 50.7 22 1192 01 28 01 01 29 31 =1530+239 18 39 58 47.2 257.9 3.1 50.8 90 1204 01 28 02 Schedule for URUMQI (Code Ur ) 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 18 40 24 47.3 257.3 3.1 50.5 22 1204 01 29 58 01 40 28 --- 18 50 56 45.4 259.5 3.2 51.0 630 1285 01 29 59 01 40 54 J1532+2344 18 51 23 45.1 260.3 3.3 51.3 23 1285 01 40 54 01 42 24 =1530+239 18 52 53 44.9 260.6 3.3 51.4 90 1296 01 40 55 01 44 25 OQ208 18 54 54 31.8 280.5 4.8 54.2 92 1296 01 44 25 01 49 25 --- 18 59 55 30.9 281.2 4.9 54.0 300 1335 01 44 26 01 51 24 J1532+2344 19 01 54 43.2 262.4 3.5 51.7 91 1335 01 51 24 01 52 54 =1530+239 19 03 25 43.0 262.7 3.5 51.8 90 1346 01 51 25 01 53 20 ARP220 19 03 51 43.1 262.1 3.5 51.6 22 1346 01 53 20 02 03 50 --- 19 14 23 41.2 264.1 3.6 51.9 630 1427 01 53 21 02 04 18 J1532+2344 19 14 51 40.9 264.8 3.7 52.1 24 1427 02 04 18 02 05 48 =1530+239 19 16 21 40.6 265.1 3.7 52.1 90 1438 02 04 19 02 06 15 ARP220 19 16 48 40.8 264.6 3.7 51.9 22 1438 02 06 15 02 16 45 --- 19 27 19 38.9 266.5 3.9 52.1 630 1519 02 06 16 02 17 14 J1532+2344 19 27 48 38.6 267.2 3.9 52.3 24 1519 02 17 14 02 18 44 =1530+239 19 29 18 38.3 267.5 3.9 52.3 90 1531 02 17 15 02 19 11 ARP220 19 29 46 38.5 266.9 3.9 52.2 23 1531 02 19 11 02 29 41 --- 19 40 18 36.5 268.8 4.1 52.3 630 1612 02 19 12 02 30 10 J1532+2344 19 40 47 36.2 269.5 4.1 52.4 25 1612 02 30 10 02 31 40 =1530+239 19 42 17 35.9 269.8 4.1 52.4 90 1623 02 30 11 02 32 08 ARP220 19 42 45 36.1 269.2 4.1 52.3 24 1623 02 32 08 02 42 38 --- 19 53 17 34.2 271.0 4.3 52.3 630 1704 02 32 09 02 43 08 J1532+2344 19 53 47 33.8 271.7 4.3 52.4 26 1704 02 43 08 02 44 38 =1530+239 19 55 17 33.6 272.0 4.4 52.4 90 1715 02 43 09 02 47 21 OQ208 19 58 00 20.8 289.9 5.8 50.8 135 1715 02 47 21 02 52 21 --- 20 03 01 19.9 290.6 5.9 50.5 300 1754 02 47 22 02 54 59 J1532+2344 20 05 40 31.7 273.7 4.5 52.2 131 1754 02 54 59 02 56 29 =1530+239 20 07 10 31.4 273.9 4.6 52.2 90 1765 02 55 00 02 56 58 ARP220 20 07 39 31.6 273.4 4.5 52.1 25 1765 02 56 58 03 07 28 --- 20 18 11 29.7 275.2 4.7 52.0 630 1846 02 56 59 Schedule for URUMQI (Code Ur ) Page 5 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 --- 03 07 59 J1532+2344 20 18 42 29.3 275.8 4.7 52.0 27 1846 03 07 59 03 09 29 =1530+239 20 20 13 29.1 276.1 4.8 52.0 90 1858 03 08 00 03 09 59 ARP220 20 20 42 29.2 275.6 4.7 51.9 25 1858 03 09 59 03 20 29 --- 20 31 14 27.3 277.3 4.9 51.7 630 1938 03 10 00 03 21 01 J1532+2344 20 31 46 27.0 277.9 5.0 51.7 28 1938 03 21 01 03 22 31 =1530+239 20 33 16 26.7 278.2 5.0 51.7 90 1950 03 21 02 03 23 01 ARP220 20 33 46 26.9 277.7 5.0 51.6 26 1950 03 23 01 03 33 31 --- 20 44 18 25.0 279.4 5.1 51.3 630 2031 03 23 02 03 34 03 J1532+2344 20 44 50 24.6 280.0 5.2 51.3 28 2031 03 34 03 03 35 33 =1530+239 20 46 20 24.4 280.2 5.2 51.2 90 2042 03 34 04 03 36 03 ARP220 20 46 51 24.5 279.8 5.2 51.2 26 2042 03 36 03 03 46 33 --- 20 57 23 22.6 281.4 5.4 50.8 630 2123 03 36 04 03 47 06 J1532+2344 20 57 55 22.3 282.0 5.4 50.8 29 2123 03 47 06 03 48 36 =1530+239 20 59 26 22.0 282.3 5.4 50.7 90 2135 03 47 07 03 51 44 OQ208 21 02 34 10.1 299.7 6.9 45.8 162 2135 03 51 44 03 56 44 --- 21 07 35 9.4 300.4 7.0 45.3 300 2173 03 51 45 03 59 41 J1532+2344 21 10 32 20.1 284.0 5.6 50.2 152 2173 03 59 41 04 01 11 =1530+239 21 12 02 19.8 284.2 5.6 50.2 90 2185 03 59 42 04 01 42 ARP220 21 12 33 20.0 283.8 5.6 50.2 27 2185 04 01 42 04 12 12 --- 21 23 05 18.1 285.4 5.8 49.7 630 2265 04 01 43 04 12 44 J1532+2344 21 23 38 17.8 286.0 5.8 49.6 29 2265 04 12 44 04 14 14 =1530+239 21 25 08 17.5 286.3 5.9 49.5 90 2277 04 12 45 04 14 46 ARP220 21 25 40 17.7 285.8 5.8 49.5 27 2277 04 14 46 04 25 16 --- 21 36 11 15.8 287.5 6.0 49.0 630 2358 04 14 47 04 25 48 J1532+2344 21 36 44 15.5 288.1 6.0 48.9 29 2358 04 25 48 04 27 18 =1530+239 21 38 14 15.3 288.3 6.1 48.8 90 2369 04 25 49 04 27 49 ARP220 21 38 46 15.4 287.9 6.0 48.8 27 2369 04 27 49 04 38 19 --- 21 49 17 13.6 289.5 6.2 48.2 630 2450 04 27 50 04 38 52 J1532+2344 21 49 50 13.3 290.1 6.3 48.1 29 2450 04 38 52 04 40 22 =1530+239 21 51 20 13.0 290.4 6.3 48.0 90 2462 04 38 53 Schedule for URUMQI (Code Ur ) Page 6 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 --- 04 40 53 ARP220 21 51 51 13.1 289.9 6.3 48.0 27 2462 04 40 53 04 51 23 --- 22 02 23 11.4 291.6 6.4 47.3 630 2542 04 40 54 04 51 55 J1532+2344 22 02 56 11.1 292.2 6.5 47.2 28 2542 04 51 55 04 53 25 =1530+239 22 04 26 10.8 292.5 6.5 47.1 90 2554 04 51 56 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: 20 Station: URUMQI Total bit rate: 1024 Format: MARK5B 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= 1100.00 1100.00 1100.00 1100.00 1100.00 1100.00 1100.00 1100.00 Net SB= L L U U L L U U IF SB = U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 2 10 2 10 BBC SB= L L U U L L U U IF = A2 C1 A2 C1 A2 C1 A2 C1 The following frequency sets based on these setups were used. Frequency Set: 8 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= 526.00 526.00 526.00 526.00 590.00 590.00 590.00 590.00 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 8 Track assignments are: track1= 10, 14, 2, 6, 12, 16, 4, 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