14275 (Stsci Edit Number: 0, Created: Tuesday, July 14, 2015 8:28:14 PM EST) - Overview

Proposal 14275 (STScI Edit Number: 0, Created: Tuesday, July 14, 2015 8:28:14 PM EST) - Overview

14275 - Tracing the CMB Cold Spot supervoid using HI gas clouds Cycle: 23, Proposal Category: GO (Availability Mode: SUPPORTED)

INVESTIGATORS Name Institution E-Mail Prof. Tom Shanks (PI) (ESA Member) (Contact) Durham Univ. [email protected] Dr. Rich Bielby (CoI) (ESA Member) Durham Univ. [email protected] Mr. Charles Finn (CoI) (ESA Member) Durham Univ. [email protected] Dr. Michele Fumagalli (CoI) (ESA Member) Durham Univ. [email protected] Mr. Ruari Mackenzie (CoI) (ESA Member) (Contac Durham Univ. [email protected] t) Dr. TalaWanda R Monroe (CoI) Space Telescope Science Institute [email protected] Prof. Simon L. Morris (CoI) (ESA Member) Durham Univ. [email protected] Dr. Jason X. Prochaska (CoI) University of California - Santa Cruz [email protected] Dr. Yue Shen (CoI) University of Illinois at Urbana - Champaign [email protected] Dr. Istvan Szapudi (CoI) University of Hawaii [email protected] Dr. Nicolas Tejos (CoI) (AdminUSPI) (Contact) University of California - Santa Cruz [email protected] Dr. Tom Theuns (CoI) (ESA Member) Durham Univ. [email protected] Dr. Gabor Worseck (CoI) (ESA Member) Max-Planck-Institut fur Astronomie, Heidelberg [email protected]

VISITS Visit Targets used in Visit Configurations used in Visit Orbits Used Last Orbit Planner Run OP Current with Visit? 01 (1) J0315-2143 COS/FUV 3 14-Jul-2015 21:28:03.0 yes COS/NUV 02 (2) J0321-1758 COS/FUV 4 14-Jul-2015 21:28:06.0 yes COS/NUV 1 Proposal 14275 (STScI Edit Number: 0, Created: Tuesday, July 14, 2015 8:28:14 PM EST) - Overview Visit Targets used in Visit Configurations used in Visit Orbits Used Last Orbit Planner Run OP Current with Visit? 03 (2) J0321-1758 COS/FUV 2 14-Jul-2015 21:28:09.0 yes COS/NUV 04 (3) J0317-1654 COS/FUV 3 14-Jul-2015 21:28:11.0 yes COS/NUV 05 (4) J0326-1646 COS/FUV 3 14-Jul-2015 21:28:13.0 yes COS/NUV 15 Total Orbits Used

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.

OBSERVING DESCRIPTION We are going to observe 4 quasars with COS.

2 Proposal 14275-J0315-2143G160M(01)TracingtheCMBColdSpotsupervoidusing HIgasclouds Exposures Fixed Targets Visit 5 4 3 2 1 # Comments: Extended=NO (1) # Special Requirements:(none) Scientific Instruments:COS/NUV,COS/FUV Diagnostic Status:NoDiagnostics Proposal 14275,J0315-2143G160M(01) (715409) 7-FP4 G160M-157 (715409) 7-FP3 G160M-157 (715409) 7-FP2 G160M-157 (715409) 7-FP1 G160M-157 (714998) ACQ (ETC Run) Label J0315-2143 Name (1) J0315-2143 (1) J0315-2143 (1) J0315-2143 (1) J0315-2143 Target (1) J0315-2143 Equinox: J2000 Dec: -214329.70(-21.72492d) RA: 031519.2100(48.8300417d) Target Coordinates COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/NUV, ACQ/IMAGE,PSA Config,Mode,Aperture G160M 1577 A G160M 1577 A G160M 1577 A G160M MIRRORB Spectral Els. 1577 A Redshift: 0.2811 Targ. Coord.Corrections BUFFER-TIME=28 SEGMENT=BOTH FP-POS=3; FLASH=YES; 36; BUFFER-TIME=29 SEGMENT=BOTH FP-POS=2; FLASH=YES; 63; BUFFER-TIME=18 SEGMENT=BOTH FP-POS=1; FLASH=YES; 0; BUFFER-TIME=20 Opt. Params. SEGMENT=BOTH FP-POS=4; FLASH=YES; 36; 3 Special Reqs. GALEX NUVAB=17.31 GALEX FUVAB=17.89, V=16.44+/-0.2 Fluxes Groups [==>] 2936 Secs(2936Secs) [==>] 2936 Secs(2936Secs) [==>] 1963 Secs(1963Secs) [==>] 300 Secs(300Secs) [==>] 63 Secs(63Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:ICRS Miscellaneous Wed Jul1501:28:14GMT2015 Orbit [3] [2] [1] [1] [1] Proposal 14275-J0315-2143G160M(01)TracingtheCMBColdSpotsupervoidusing HIgasclouds Orbit Structure 4 Proposal 14275-J0321-1758G160M(02)TracingtheCMBColdSpotsupervoidusing HIgasclouds Exposures Fixed Targets Visit 6 5 4 3 2 1 # Comments: Extended=NO (2) # Special Requirements:(none) Scientific Instruments:COS/NUV,COS/FUV Diagnostic Status:NoDiagnostics Proposal 14275,J0321-1758G160M(02) (715388) 7-FP4 G160M-157 (715388) 7-FP3 G160M-157 (715388) 7-FP2 G160M-157 (715388) 7-FP1 G160M-157 (715388) 7-FP1 G160M-157 (717459) ACQ (ETC Run) Label J0321-1758 Name (2) J0321-1758 (2) J0321-1758 (2) J0321-1758 (2) J0321-1758 Target (2) J0321-1758 (2) J0321-1758 Equinox: J2000 Dec: -175851.50(-17.98097d) RA: 032154.3200(50.4763333d) Target Coordinates COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/NUV, ACQ/IMAGE,PSA Config,Mode,Aperture G160M 1577 A G160M 1577 A G160M 1577 A G160M MIRRORB Spectral Els. 1577 A G160M 1577 A Redshift: 0.8528 Targ. Coord.Corrections BUFFER-TIME=28 SEGMENT=BOTH FP-POS=2; FLASH=YES; 35; BUFFER-TIME=28 SEGMENT=BOTH FP-POS=1; FLASH=YES; 11; BUFFER-TIME=16 SEGMENT=BOTH FP-POS=1; FLASH=YES; 0; BUFFER-TIME=20 Opt. Params. SEGMENT=BOTH FP-POS=4; FLASH=YES; 35; BUFFER-TIME=28 SEGMENT=BOTH FP-POS=3; FLASH=YES; 35; 5 Special Reqs. GALEX NUVAB=17.49 GALEX FUVAB=18.25, V=16.68+/-0.2 Fluxes Groups [==>] 2935 Secs(2935Secs) [==>] 2935 Secs(2935Secs) [==>] 2935 Secs(2935Secs) [==>] 1711 Secs(1711Secs) [==>] 300 Secs(300Secs) [==>] 190 Secs(190Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:ICRS Miscellaneous Wed Jul1501:28:15GMT2015 Orbit [4] [3] [2] [1] [1] [1] Proposal 14275-J0321-1758G160M(02)TracingtheCMBColdSpotsupervoidusing HIgasclouds Orbit Structure 6 Proposal 14275 - J0321-1758 G160M (02) - Tracing the CMB Cold Spot supervoid using HI gas clouds

7 Proposal 14275-J0321-1758G130M(03)TracingtheCMBColdSpotsupervoidusing HIgasclouds Exposures Fixed Targets Visit 5 4 3 2 1 # Comments: Extended=NO (2) # Special Requirements:(none) Scientific Instruments:COS/NUV,COS/FUV Diagnostic Status:NoDiagnostics Proposal 14275,J0321-1758G130M(03) (717637) 7-FP4 G130M-132 (717637) 7-FP3 G130M-132 (717637) 7-FP2 G130M-132 (717637) 7-FP1 G130M-132 (717459) ACQ (ETC Run) Label J0321-1758 Name (2) J0321-1758 (2) J0321-1758 (2) J0321-1758 (2) J0321-1758 Target (2) J0321-1758 Equinox: J2000 Dec: -175851.50(-17.98097d) RA: 032154.3200(50.4763333d) Target Coordinates COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/NUV, ACQ/IMAGE,PSA Config,Mode,Aperture G130M 1327 A G130M 1327 A G130M 1327 A G130M MIRRORB Spectral Els. 1327 A Redshift: 0.8528 Targ. Coord.Corrections BUFFER-TIME=13 SEGMENT=BOTH FP-POS=3; FLASH=YES; 15; BUFFER-TIME=13 SEGMENT=BOTH FP-POS=2; FLASH=YES; 42; BUFFER-TIME=16 SEGMENT=BOTH FP-POS=1; FLASH=YES; 0; BUFFER-TIME=20 Opt. Params. SEGMENT=BOTH FP-POS=4; FLASH=YES; 15; 8 Special Reqs. GALEX NUVAB=17.49 GALEX FUVAB=18.25, V=16.68+/-0.2 Fluxes Groups [==>] 1415 Secs(1415Secs) [==>] 1415 Secs(1415Secs) [==>] 1742 Secs(1742Secs) [==>] 300 Secs(300Secs) [==>] 190 Secs(190Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:ICRS Miscellaneous Wed Jul1501:28:15GMT2015 Orbit [2] [2] [1] [1] [1] Proposal 14275-J0321-1758G130M(03)TracingtheCMBColdSpotsupervoidusing HIgasclouds Orbit Structure 9 Proposal 14275-J0317-1654G160M(04)TracingtheCMBColdSpotsupervoidusing HIgasclouds Exposures Fixed Targets Visit 5 4 3 2 1 # Comments: Extended=NO (3) # Special Requirements:(none) Scientific Instruments:COS/NUV,COS/FUV Diagnostic Status:NoDiagnostics Proposal 14275,J0317-1654G160M(04) (715389) 7-FP4 G160M-157 (715389) 7-FP3 G160M-157 (715389) 7-FP2 G160M-157 (715389) 7-FP1 G160M-157 (717476) ACQ (ETC Run) Label J0317-1654 Name (3) J0317-1654 (3) J0317-1654 (3) J0317-1654 (3) J0317-1654 Target (3) J0317-1654 Equinox: J2000 Dec: -165452.20(-16.91450d) RA: 031759.6900(49.4987083d) Target Coordinates COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/NUV, ACQ/IMAGE,PSA Config,Mode,Aperture G160M 1577 A G160M 1577 A G160M 1577 A G160M MIRRORB Spectral Els. 1577 A Redshift: 0.3505 Targ. Coord.Corrections BUFFER-TIME=28 SEGMENT=BOTH FP-POS=3; FLASH=YES; 35; BUFFER-TIME=28 SEGMENT=BOTH FP-POS=2; FLASH=YES; 64; BUFFER-TIME=18 SEGMENT=BOTH FP-POS=1; FLASH=YES; 0; BUFFER-TIME=20 Opt. Params. SEGMENT=BOTH FP-POS=4; FLASH=YES; 35; 10 Special Reqs. GALEX NUVAB=17.47 GALEX FUVAB=17.99, V=16.55+/-0.2 Fluxes Groups [==>] 2935 Secs(2935Secs) [==>] 2935 Secs(2935Secs) [==>] 1964 Secs(1964Secs) [==>] 300 Secs(300Secs) [==>] 62 Secs(62Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:ICRS Miscellaneous Wed Jul1501:28:16GMT2015 Orbit [3] [2] [1] [1] [1] Proposal 14275-J0317-1654G160M(04)TracingtheCMBColdSpotsupervoidusing HIgasclouds Orbit Structure 11 Proposal 14275-J0326-1646G160M(05)TracingtheCMBColdSpotsupervoidusing HIgasclouds Exposures Fixed Targets Visit 5 4 3 2 1 # Comments: Extended=NO (4) # Special Requirements:(none) Scientific Instruments:COS/NUV,COS/FUV Diagnostic Status:NoDiagnostics Proposal 14275,J0326-1646G160M(05) (715406) 7-FP4 G160M-157 (715406) 7-FP3 G160M-157 (715406) 7-FP2 G160M-157 (715406) 7-FP1 G160M-157 (717479) ACQ (ETC Run) Label J0326-1646 Name (4) J0326-1646 (4) J0326-1646 (4) J0326-1646 (4) J0326-1646 Target (4) J0326-1646 Equinox: J2000 Dec: -164617.00(-16.77139d) RA: 032541.0800(51.4211667d) Target Coordinates COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/FUV, TIME-TAG,PSA COS/NUV, ACQ/IMAGE,PSA Config,Mode,Aperture G160M 1577 A G160M 1577 A G160M 1577 A G160M MIRRORB Spectral Els. 1577 A Redshift: 0.2910 Targ. Coord.Corrections BUFFER-TIME=28 SEGMENT=BOTH FP-POS=3; FLASH=YES; 35; BUFFER-TIME=28 SEGMENT=BOTH FP-POS=2; FLASH=YES; 60; BUFFER-TIME=18 SEGMENT=BOTH FP-POS=1; FLASH=YES; 0; BUFFER-TIME=20 Opt. Params. SEGMENT=BOTH FP-POS=4; FLASH=YES; 35; 12 Special Reqs. GALEX NUVAB=17.44 GALEX FUVAB=17.82, V=16.7+/-0.2 Fluxes Groups [==>] 2935 Secs(2935Secs) [==>] 2935 Secs(2935Secs) [==>] 1960 Secs(1960Secs) [==>] 300 Secs(300Secs) [==>] 64 Secs(64Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:ICRS Miscellaneous Wed Jul1501:28:16GMT2015 Orbit [3] [2] [1] [1] [1] Proposal 14275-J0326-1646G160M(05)TracingtheCMBColdSpotsupervoidusing HIgasclouds Orbit Structure 13