15999( 12) - 26-Feb-2020 18:06:48 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15999 Version: 12 Check-in Time: 26-Feb-2020 18:06:48 STScI Edit Number: 4 Title What is the Mass of the NGC 300 X-1 Black Hole? ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Breanna Binder California State Polytechnic University, Y Pomona CoI: Dr. Benjamin F. Williams University of Washington N CoI: Prof. Michael Eracleous The Pennsylvania State University N CoI: Dr. Paul P. Plucinsky Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ Abstract NGC 300 X-1 is a high mass Wolf-Rayet + black hole X-ray binary located ~2 Mpc away in the spiral galaxy NGC 300. Radial velocity measurements of the He II 4686 line were used to derive a black hole mass M_BH~20 M_sun, making X-1 one of the heaviest known X-ray-bright solar-mass BHs. However, follow-up Chandra observations revealed a phase shift between the X-ray emission and the He II 4686 radial velocity, indicating that this emission line did not trace the motion of the WR donor; recent XMM-Newton observations have confirmed this discrepancy, thereby invalidating prior estimates of M_BH. With combined Chandra X-ray imaging/timing and HST/COS FUV spectroscopy that samples the binary orbital period, we will be able to reliably separate the spectral features of the WR donor and provide correct measurements of the system's component masses. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will collect COS spectra for the Wolf-Rayet + black hole binary NGC 300 X-1 at four different orbital phases (with 2 orbits per visit). The instrument settings for all four visits is identical: NGC 300 X-1 (4 x 2 orbits): COS/FUV G140L. The best measurement of the binary orbital period is 32.7932 +/- 0.0029 hr, with a zero-point time corresponding to phase=0 (e.g., the deepest part of the X-ray dip) on MJD 57741.3642. The Hubble visits should roughly sample the entire binary orbital period, although they need not be taken during a single orbital cycle. However, to keep the orbital phase uncertainty to a minimum, all HST visits and the Chandra X-ray observations should be completed within roughly one month of one another. ------------------------------------------------------------------------------------ 15999( 12) - 26-Feb-2020 18:06:48 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-300-X-1 STAR, WIND, WOLF RAYET, RA=00H55M9.9900S +/- 0.201", J2000 V = 144 V = 22.44 WOLF RAYET - WN DEC=-37D42'12.65" +/- 0.171" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 15999( 12) - 26-Feb-2020 18:06:48 - [ 3] Visit: 01 (Phase01) Visit Requirements: Period 32.8 H AND ZERO-PHASE HJD2457741.8642 On Hold Comments: Additional Comments: Must be taken within ~1 month of the coordianted Chandra observations 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 NGC-300-X-1 COS/NUV ACQ/IMA PSA MIRRORA 1 40 S (40 PHASE 0.975 TO 0.025; GS GE S) ACQ SCENARIO BASE1BE; SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=1 see below (1153 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=2 see below (1153 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S SEQ 4-5 NON-INT G SEGMENT=BOTH, FP-POS=3 see below (1364 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=4 see below (1364 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-300-X-1 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-300-X-1 2 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 1153.0 S G NGC-300-X-1 3 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 1153.0 S G NGC-300-X-1 4 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 1364.0 S G NGC-300-X-1 5 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 1364.0 S G 15999( 12) - 26-Feb-2020 18:06:48 - [ 4] Visit: 02 (Phase02) Visit Requirements: Period 32.8 H AND ZERO-PHASE HJD2457741.8642 On Hold Comments: Additional Comments: Must be taken within ~1 month of the coordianted Chandra observations 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 NGC-300-X-1 COS/NUV ACQ/IMA PSA MIRRORA 1 40 S (40 PHASE 0.225 TO 0.275; GS GE S) ACQ SCENARIO BASE1BE; SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=1 see below (1153 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=2 see below (1153 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S SEQ 4-5 NON-INT G SEGMENT=BOTH, FP-POS=3 see below (1364 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=4 see below (1364 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-300-X-1 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-300-X-1 2 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 1153.0 S G NGC-300-X-1 3 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 1153.0 S G NGC-300-X-1 4 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 1364.0 S G NGC-300-X-1 5 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 1364.0 S G 15999( 12) - 26-Feb-2020 18:06:48 - [ 5] Visit: 03 (Phase03) Visit Requirements: Period 32.8 H AND ZERO-PHASE HJD2457741.8642 On Hold Comments: Additional Comments: Must be taken within ~1 month of the coordianted Chandra observations 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 NGC-300-X-1 COS/NUV ACQ/IMA PSA MIRRORA 1 40 S (40 PHASE 0.475 TO 0.525; GS GE S) ACQ SCENARIO BASE1BE; SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=1 see below (1153 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=2 see below (1153 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S SEQ 4-5 NON-INT G SEGMENT=BOTH, FP-POS=3 see below (1364 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=4 see below (1364 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-300-X-1 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-300-X-1 2 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 1153.0 S G NGC-300-X-1 3 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 1153.0 S G NGC-300-X-1 4 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 1364.0 S G NGC-300-X-1 5 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 1364.0 S G 15999( 12) - 26-Feb-2020 18:06:48 - [ 6] Visit: 04 (Phase04) Visit Requirements: Period 32.8 H AND ZERO-PHASE HJD2457741.8642 On Hold Comments: Additional Comments: Must be taken within ~1 month of the coordianted Chandra observations 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 NGC-300-X-1 COS/NUV ACQ/IMA PSA MIRRORA 1 40 S (40 PHASE 0.725 TO 0.775; GS GE S) ACQ SCENARIO BASE1BE; SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=1 see below (1153 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=2 see below (1153 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S SEQ 4-5 NON-INT G SEGMENT=BOTH, FP-POS=3 see below (1364 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-300-X-1 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1.7e4, FLASH=YES, 1 1000 S G SEGMENT=BOTH, FP-POS=4 see below (1364 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-300-X-1 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-300-X-1 2 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 1153.0 S G NGC-300-X-1 3 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 1153.0 S G NGC-300-X-1 4 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 1364.0 S G NGC-300-X-1 5 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 1364.0 S G 15999( 12) - 26-Feb-2020 18:06:48 - [ 7] Summary Form for Proposal 15999 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1.7e4, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1BE, PHASE 0.225 TO 0.275, PHASE 0.475 TO 0.525, PHASE 0.725 TO 0.775, PHASE 0.975 TO 0.025, Period 32.8 H AND ZERO-PHASE HJD2457741.8642, SEQ 1-3 NON-INT, SEQ 4-5 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-300-X-1 ------------------------------------------------------------------------------------------------------------------------------------