THE LAUNCH MECHANISM OF ACCRETION DISC WINDS: THE BEST TESTS FROM THE NEUTRON STAR BINARIES GX13+1 AND 2S0921-630
Accretion disc winds are clearly seen in black hole and neutron star binaries, but their origin is controversial. Are they magnetically driven, connecting them to the jet as well as to the accretion process itself, or are they thermal/radiative, driven by X-ray irradiation of the outer disc? GX13+1 persistently shows a massive wind in absorption, and is the most reliable LMXRB wind source to address the key question of the origin of the wind. A 30ks Resolve observation can directly measure the wind velocity profile along the line of sight, which will distinguish between magnetic and thermal-radiative acceleration. An additional 80ks observation of 2S0921 will instead shows the wind in emission, as its very high inclination angle means the X-ray source is obscured by the disc.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '300036010' / Observation identification string OBJECT = 'GX13+1 ' / Object name OBSERVER= 'XRISM Collaboration' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 273.63125 / [deg] Object Right ascension DEC_OBJ = -17.15742 / [deg] Object Declination RA_PNT = 273.616343958815 / Pointing RA DEC_PNT = -17.1622316060796 / Pointing DEC RA_NOM = 273.630505451449 / [deg] Nominal aspect point R.A. DEC_NOM = -17.1566900339 / [deg] Nominal aspect point Dec. PA_NOM = 91.3902607665035 / [deg] Nominal aspect point roll. TELAPSE = 80832.9632070065 / Elapsed time DATE-OBS= '2024-02-25T01:35:25.036758' / Start date DATE-END= '2024-02-26T00:02:37.999965' / Stop date ONTIME = 27915.98595 / On-source time EXPOSURE= 27915.98595 / Exposure time PROCVER = '03.00.013.009' / Processing script version MKFFF = 'ISAS/JAXA' / Origin of First FITS file ORIGIN = 'GSFC/NASA' / Origin of Processed FITS file SOFTVER = 'Hea_21Aug2024_V6.34_XRISM_21Aug2024_V001' / Version of HEADAS used CALDBVER= 'gen20240315_xtd20240815_rsl20240815' / Version of CALDB used DATE = '2024-09-26T08:51:04' / Date and time this file was created or updated SIB2_VER= / SIB2 version JAXA