14085( 2) - 14-Jul-2015 13:19:02 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14085 Version: 2 Check-in Time: 14-Jul-2015 13:19:02 STScI Edit Number: 0 Title Circumgalactic gas at its extreme - the absorption properties of interacting galaxies ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Philipp Richter Universitat Potsdam Y CoI: Dr. Nadya Ben Bekhti Universitat Bonn, Argelander Institute for N Astronomy CoI: Dr. George Heald Stichting Astronomisch Onderzoek in N Nederland (ASTRON) CoI: Dr. Erwin de Blok Stichting Astronomisch Onderzoek in N Nederland (ASTRON) CoI: Mr. Lars Floer Universitat Bonn, Argelander Institute for N Astronomy CoI: Dr. Filippo Fraternali Universita di Bologna N CoI: Dr. Gianfranco Gentile Universiteit Gent N CoI: Gyula Josza Stichting Astronomisch Onderzoek in N Nederland (ASTRON) CoI: Dr. Eva Juette Ruhr-Universitat Bochum N CoI: Dr. Peter Kamphuis CSIRO, Australia Telescope National N Facility CoI: Dr. Rene A. Walterbos New Mexico State University N CoI: Dr. Benjamin Winkel Max-Planck-Institut fur Radioastronomie N CoI: Dr. Laura Zschaechner Max-Planck-Institut fur Astronomie, N Heidelberg ------------------------------------------------------------------------------------ Abstract We propose HST/COS observations of two background QSOs whose sightlines pass through the extended tidal gas filaments of the interacting galaxy NGC4631 at impact parameters of 40 and 80 kpc. The "whale galaxy" NGC4631 represents one of the most spectacular and best-studied example of a gas-rich interacting galaxy at z~0. We recently obtained extremely deep HI 21-cm observations as part of the HALOGAS project and identified two QSOs that can be used to trace the same physical region in absorption. We will combine the UV absorption-line data from COS (covering important low and intermediate ions such as OI, SiII, SiIII) with the new 21-cm data from HALOGAS. The goal is to study the kinematics and chemical composition of the circumgalacic gas component of NGC4631 and to explore its origin and fate. We further want to characterize the absorption properties of the NGC4631 environment in the general context of quasar-absorption line systems and estimate the contribution of interacting galaxies to the cross section of intervening Lymanlimit 14085( 2) - 14-Jul-2015 13:19:02 - [ 2] systems and Damped-Lyman-Alpha absorbers. Only HST/COS provides the necessary UV capabilities to combine these important aspects of galaxy evolution and QSO absorption-line statistics in the local universe. ------------------------------------------------------------------------------------ Observations Description ------------------------ To study the CGM around NGC 4631 we are planing to observe two background QSOs with COS using the G130M grating. Both targets (SDSS J124044.68+330349.8 and 2MASS J12421031+3214268) are faint; both QSOs have GALEX FUV magnitudes of m_FUV=18.78, from which for each target a FUV flux of 1.45e(-15) erg sec-1 cm-2 A-1 is estimated. We are planning for two 5-orbit visits. The accuracy for the target coordinates is 0.1-0.3 arcsecs; yet, to ensure exact pointing, we will take for each target an ACQ/SEARCH exposure with SCAN-SIZE=2 before the ACQ/PEAKXD and ACQ/PEAKD exposures are carried out. For the ACQ exposures the ETC (v.23.2) delivers integration times of 49 second to achieve a S/N of 40. For each of the two targets we will take 10 science exposures with integration times between 848 and 1500 seconds. For the science exposures we will use the TIME-TAG mode and the G130M (1291) configuration together with 4 different FP-POS positions. BUFFER-TIMES have been derived by adopting 2/3 of the buffer times calculated with the ETC. The total (science) integration time for each tartget is ~13, 000 seconds, resulting in a S/N per resolution element of 11 at 1310 A (according to the ETC) after combining all sub-exposures. ------------------------------------------------------------------------------------ 14085( 2) - 14-Jul-2015 13:19:02 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS-J124044 GALAXY, QSO RA=12H40M44.6850S +/- 0.1", J2000 V = 17.66 .68+330349.8 DEC=+33D03'49.85" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J12421 GALAXY, QSO RA=12H42M10.3200S +/- 0.3", J2000 V = 18.0 031+3214268 DEC=+32D14'26.80" +/- 0.3" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 14085( 2) - 14-Jul-2015 13:19:02 - [ 4] 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 SDSS-J12404 COS/FUV ACQ/SEA PSA G130M 1291 SCAN-SIZE=2, CENTER=FLUX-WT 1 49 S (49 4.68+330349 RCH S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS-J12404 COS/FUV ACQ/PEA PSA G130M 1291 1 49 S (49 4.68+330349 KXD S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS-J12404 COS/FUV ACQ/PEA PSA G130M 1291 NUM-POS=5.0, STEP-SIZE=0.9 1 49 S (49 4.68+330349 KD S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS-J12404 COS/FUV TIME-TA PSA G130M 1291 FP-POS=1, BUFFER-TIME=3807 1 848 S (848 4.68+330349 G S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS-J12404 COS/FUV TIME-TA PSA G130M 1291 FP-POS=1, BUFFER-TIME=3807 1 848 S (848 4.68+330349 G S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 6 SDSS-J12404 COS/FUV TIME-TA PSA G130M 1291 FP-POS=2, BUFFER-TIME=3807 1 1325 S 4.68+330349 G (1325 S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 7 SDSS-J12404 COS/FUV TIME-TA PSA G130M 1291 FP-POS=2, BUFFER-TIME=3807 1 1500 S 4.68+330349 G (1500 S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 8 SDSS-J12404 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=3807 1 1500 S 4.68+330349 G (1500 S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 9 SDSS-J12404 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=3807 1 1325 S 4.68+330349 G (1325 S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 10 SDSS-J12404 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=3807 1 1325 S 4.68+330349 G (1325 S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 14085( 2) - 14-Jul-2015 13:19:02 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 SDSS-J12404 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=3807 1 1500 S 4.68+330349 G (1500 S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 12 SDSS-J12404 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=3807 1 1500 S 4.68+330349 G (1500 S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 13 SDSS-J12404 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=3807 1 1325 S 4.68+330349 G (1325 S) .8 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSS-J124044.68+330 1 COS/FUV ACQ/SEA PSA G130M 1291 none none none none 1 N/A 349.8 RCH SDSS-J124044.68+330 2 COS/FUV ACQ/PEA PSA G130M 1291 none none none none 1 N/A 349.8 KXD SDSS-J124044.68+330 3 COS/FUV ACQ/PEA PSA G130M 1291 none none none none 1 N/A 349.8 KD SDSS-J124044.68+330 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 349.8 G SDSS-J124044.68+330 5 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 349.8 G SDSS-J124044.68+330 6 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 349.8 G SDSS-J124044.68+330 7 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 349.8 G SDSS-J124044.68+330 8 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A 349.8 G SDSS-J124044.68+330 9 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A 349.8 G SDSS-J124044.68+330 10 COS/FUV TIME-TA PSA G130M 1291 none none none none 4 N/A 349.8 G SDSS-J124044.68+330 11 COS/FUV TIME-TA PSA G130M 1291 none none none none 4 N/A 349.8 G SDSS-J124044.68+330 12 COS/FUV TIME-TA PSA G130M 1291 none none none none 5 N/A 349.8 G SDSS-J124044.68+330 13 COS/FUV TIME-TA PSA G130M 1291 none none none none 5 N/A 349.8 G 14085( 2) - 14-Jul-2015 13:19:02 - [ 6] 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 2MASS-J1242 COS/FUV ACQ/SEA PSA G130M 1291 SCAN-SIZE=2, CENTER=FLUX-WT 1 49 S (49 1031+321426 RCH S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J1242 COS/FUV ACQ/PEA PSA G130M 1291 1 49 S (49 1031+321426 KXD S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J1242 COS/FUV ACQ/PEA PSA G130M 1291 NUM-POS=5.0, STEP-SIZE=0.9 1 49 S (49 1031+321426 KD S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J1242 COS/FUV TIME-TA PSA G130M 1291 FP-POS=1, BUFFER-TIME=3843 1 853 S (853 1031+321426 G S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 5 2MASS-J1242 COS/FUV TIME-TA PSA G130M 1291 FP-POS=1, BUFFER-TIME=3843 1 853 S (853 1031+321426 G S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 6 2MASS-J1242 COS/FUV TIME-TA PSA G130M 1291 FP-POS=2, BUFFER-TIME=3843 1 1325 S 1031+321426 G (1325 S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 7 2MASS-J1242 COS/FUV TIME-TA PSA G130M 1291 FP-POS=2, BUFFER-TIME=3843 1 1500 S 1031+321426 G (1500 S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 8 2MASS-J1242 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=3843 1 1500 S 1031+321426 G (1500 S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 9 2MASS-J1242 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=3843 1 1325 S 1031+321426 G (1325 S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 10 2MASS-J1242 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=3843 1 1325 S 1031+321426 G (1325 S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 14085( 2) - 14-Jul-2015 13:19:02 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 2MASS-J1242 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=3843 1 1500 S 1031+321426 G (1500 S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 12 2MASS-J1242 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=3843 1 1500 S 1031+321426 G (1500 S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 13 2MASS-J1242 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=3843 1 1325 S 1031+321426 G (1325 S) 8 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J12421031+321 1 COS/FUV ACQ/SEA PSA G130M 1291 none none none none 1 N/A 4268 RCH 2MASS-J12421031+321 2 COS/FUV ACQ/PEA PSA G130M 1291 none none none none 1 N/A 4268 KXD 2MASS-J12421031+321 3 COS/FUV ACQ/PEA PSA G130M 1291 none none none none 1 N/A 4268 KD 2MASS-J12421031+321 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 4268 G 2MASS-J12421031+321 5 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 4268 G 2MASS-J12421031+321 6 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 4268 G 2MASS-J12421031+321 7 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 4268 G 2MASS-J12421031+321 8 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A 4268 G 2MASS-J12421031+321 9 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A 4268 G 2MASS-J12421031+321 10 COS/FUV TIME-TA PSA G130M 1291 none none none none 4 N/A 4268 G 2MASS-J12421031+321 11 COS/FUV TIME-TA PSA G130M 1291 none none none none 4 N/A 4268 G 2MASS-J12421031+321 12 COS/FUV TIME-TA PSA G130M 1291 none none none none 5 N/A 4268 G 2MASS-J12421031+321 13 COS/FUV TIME-TA PSA G130M 1291 none none none none 5 N/A 4268 G 14085( 2) - 14-Jul-2015 13:19:02 - [ 8] Summary Form for Proposal 14085 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAKD, ACQ/PEAKXD, ACQ/SEARCH, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=3807, BUFFER-TIME=3843, CENTER=FLUX-WT, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, NUM-POS=5.0, SCAN-SIZE=2, STEP-SIZE=0.9 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASS-J12421031+3214268, SDSS-J124044.68+330349.8 ------------------------------------------------------------------------------------------------------------------------------------