14275( 2) - 13-Jul-2015 12:24:49 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14275 Version: 2 Check-in Time: 13-Jul-2015 12:24:49 STScI Edit Number: 0 Title Tracing the CMB Cold Spot supervoid using HI gas clouds ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Tom Shanks Durham Univ. Y CoI: Dr. Rich Bielby Durham Univ. N CoI: Mr. Charles Finn Durham Univ. N CoI: Dr. Michele Fumagalli Durham Univ. N CoI: Mr. Ruari Mackenzie Durham Univ. Y CoI: Dr. TalaWanda R Monroe Space Telescope Science Institute N CoI: Prof. Simon L. Morris Durham Univ. N CoI: Dr. Jason X. Prochaska University of California - Santa Cruz N CoI: Dr. Yue Shen University of Illinois at Urbana - N Champaign CoI: Dr. Istvan Szapudi University of Hawaii N CoI: Dr. Nicolas Tejos University of California - Santa Cruz Y CoI: Dr. Tom Theuns Durham Univ. N CoI: Dr. Gabor Worseck Max-Planck-Institut fur Astronomie, N Heidelberg ------------------------------------------------------------------------------------ Abstract The Cosmic Microwave Background (CMB) Cold Spot, a ~100 sq. deg. area with abnormally low temperatures, remains one of the greatest anomalies of the cosmic microwave sky. If primordial in origin, it represents a 3-4 sigma fluctuation in a LCDM cosmology. The alternative possibility is that it is caused by the Integrated Sachs-Wolfe (ISW) effect where a foreground supervoid imparts a net gravitational redshift to the CMB photons as they pass through. Recently such a supervoid has been claimed to be detected in the galaxy distribution at z~0.2, with a ~300/h Mpc diameter, representing a 2 sigma fluctuation in the LCDM model. Our prime aim is to test if the void is independently detected in the intergalactic medium traced by HI Lyman alpha absorption. Two quasar sightlines at ~10deg from the Cold Spot centre have already been serendipitously observed by COS and these show a tentative (~3 sigma) deficiency of Lyman-alpha absorption lines (Mackenzie et al 2015). In order to test further this potentially exciting detection of the Cold Spot supervoid in absorption we propose to use COS to observe 4 more quasars within a few degrees of the Cold Spot centre. If the HI underdensity reproduces at the same level then this could provide a >4 sigma detection of the supervoid. Such a result would not only be vital for a cosmological explanation of the Cold Spot anomaly but also revolutionise our view of how hydrogen gas clouds trace dark matter underdensities on the largest scales. ------------------------------------------------------------------------------------ Observations Description ------------------------ We are going to observe 4 quasars with COS. ------------------------------------------------------------------------------------ 14275( 2) - 13-Jul-2015 12:24:49 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 J0315-2143 GALAXY, QSO, QUASAR RA=03H15M19.2100S +/- 0.05", J2000 Z = V = 16.44 +/- 0.2 GALEX FUV AB=17.89, DEC=-21D43'29.70" +/- 0.05" 0.2811 GALEX NUV AB=17.31 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 2 J0321-1758 GALAXY, QSO, QUASAR RA=03H21M54.3200S +/- 0.05", J2000 Z = V = 16.68 +/- 0.2 GALEX FUV AB=18.25, DEC=-17D58'51.50" +/- 0.05" 0.8528 GALEX NUV AB=17.49 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 3 J0317-1654 GALAXY, QSO, QUASAR RA=03H17M59.6900S +/- 0.05", J2000 Z = V = 16.55 +/- 0.2 GALEX FUV AB=17.99, DEC=-16D54'52.20" +/- 0.05" 0.3505 GALEX NUV AB=17.47 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 4 J0326-1646 GALAXY, QSO, QUASAR RA=03H25M41.0800S +/- 0.05", J2000 Z = V = 16.7 +/- 0.2 GALEX FUV AB=17.82, DEC=-16D46'17.00" +/- 0.05" 0.2910 GALEX NUV AB=17.44 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 14275( 2) - 13-Jul-2015 12:24:49 - [ 3] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J0315-2143 COS/NUV ACQ/IMA PSA MIRRORB 1 63 S (63 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J0315-2143 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=200, FLASH=YES, 1 300 S (300 G FP-POS=1, SEGMENT=BOTH S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J0315-2143 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=1863, FLASH=YES, 1 1963 S G FP-POS=2, SEGMENT=BOTH (1963 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J0315-2143 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=2936, FLASH=YES, 1 2936 S G FP-POS=3, SEGMENT=BOTH (2936 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 J0315-2143 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=2836, FLASH=YES, 1 2936 S G FP-POS=4, SEGMENT=BOTH (2936 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ J0315-2143 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE J0315-2143 2 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 N/A G J0315-2143 3 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 N/A G J0315-2143 4 COS/FUV TIME-TA PSA G160M 1577 none none none none 2 N/A G J0315-2143 5 COS/FUV TIME-TA PSA G160M 1577 none none none none 3 N/A G 14275( 2) - 13-Jul-2015 12:24:49 - [ 4] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J0321-1758 COS/NUV ACQ/IMA PSA MIRRORB 1 190 S (190 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J0321-1758 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=200, FLASH=YES, 1 300 S (300 G FP-POS=1, SEGMENT=BOTH S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J0321-1758 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=1611, FLASH=YES, 1 1711 S G FP-POS=1, SEGMENT=BOTH (1711 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J0321-1758 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=2835, FLASH=YES, 1 2935 S G FP-POS=2, SEGMENT=BOTH (2935 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 J0321-1758 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=2835, FLASH=YES, 1 2935 S G FP-POS=3, SEGMENT=BOTH (2935 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 J0321-1758 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=2835, FLASH=YES, 1 2935 S G FP-POS=4, SEGMENT=BOTH (2935 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ J0321-1758 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE J0321-1758 2 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 N/A G J0321-1758 3 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 N/A G J0321-1758 4 COS/FUV TIME-TA PSA G160M 1577 none none none none 2 N/A G J0321-1758 5 COS/FUV TIME-TA PSA G160M 1577 none none none none 3 N/A G J0321-1758 6 COS/FUV TIME-TA PSA G160M 1577 none none none none 4 N/A G 14275( 2) - 13-Jul-2015 12:24:49 - [ 5] Visit: 03 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J0321-1758 COS/NUV ACQ/IMA PSA MIRRORB 1 190 S (190 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J0321-1758 COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=200, FLASH=YES, 1 300 S (300 G FP-POS=1, SEGMENT=BOTH S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J0321-1758 COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=1642, FLASH=YES, 1 1742 S G FP-POS=2, SEGMENT=BOTH (1742 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J0321-1758 COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=1315, FLASH=YES, 1 1415 S G FP-POS=3, SEGMENT=BOTH (1415 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 J0321-1758 COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=1315, FLASH=YES, 1 1415 S G FP-POS=4, SEGMENT=BOTH (1415 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ J0321-1758 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE J0321-1758 2 COS/FUV TIME-TA PSA G130M 1327 none none none none 1 N/A G J0321-1758 3 COS/FUV TIME-TA PSA G130M 1327 none none none none 1 N/A G J0321-1758 4 COS/FUV TIME-TA PSA G130M 1327 none none none none 2 N/A G J0321-1758 5 COS/FUV TIME-TA PSA G130M 1327 none none none none 2 N/A G 14275( 2) - 13-Jul-2015 12:24:49 - [ 6] Visit: 04 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J0317-1654 COS/NUV ACQ/IMA PSA MIRRORB 1 62 S (62 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J0317-1654 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=200, FLASH=YES, 1 300 S (300 G FP-POS=1, SEGMENT=BOTH S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J0317-1654 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=1864, FLASH=YES, 1 1964 S G FP-POS=2, SEGMENT=BOTH (1964 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J0317-1654 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=2835, FLASH=YES, 1 2935 S G FP-POS=3, SEGMENT=BOTH (2935 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 J0317-1654 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=2835, FLASH=YES, 1 2935 S G FP-POS=4, SEGMENT=BOTH (2935 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ J0317-1654 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE J0317-1654 2 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 N/A G J0317-1654 3 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 N/A G J0317-1654 4 COS/FUV TIME-TA PSA G160M 1577 none none none none 2 N/A G J0317-1654 5 COS/FUV TIME-TA PSA G160M 1577 none none none none 3 N/A G 14275( 2) - 13-Jul-2015 12:24:49 - [ 7] Visit: 05 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J0326-1646 COS/NUV ACQ/IMA PSA MIRRORB 1 64 S (64 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J0326-1646 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=200, FLASH=YES, 1 300 S (300 G FP-POS=1, SEGMENT=BOTH S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J0326-1646 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=1860, FLASH=YES, 1 1960 S G FP-POS=2, SEGMENT=BOTH (1960 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J0326-1646 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=2835, FLASH=YES, 1 2935 S G FP-POS=3, SEGMENT=BOTH (2935 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 J0326-1646 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=2835, FLASH=YES, 1 2935 S G FP-POS=4, SEGMENT=BOTH (2935 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ J0326-1646 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE J0326-1646 2 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 N/A G J0326-1646 3 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 N/A G J0326-1646 4 COS/FUV TIME-TA PSA G160M 1577 none none none none 2 N/A G J0326-1646 5 COS/FUV TIME-TA PSA G160M 1577 none none none none 3 N/A G 14275( 2) - 13-Jul-2015 12:24:49 - [ 8] Summary Form for Proposal 14275 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1315, BUFFER-TIME=1611, BUFFER-TIME=1642, BUFFER-TIME=1860, BUFFER-TIME=1863, BUFFER-TIME=1864, BUFFER-TIME=200, BUFFER-TIME=2835, BUFFER-TIME=2836, BUFFER-TIME=2936, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G160M, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names J0315-2143, J0317-1654, J0321-1758, J0326-1646 ------------------------------------------------------------------------------------------------------------------------------------