DDT TOO REQUEST OF V4641
V4641 Sgr is a transient Galactic black hole X-ray binary (BHXB) with unique spectral properties. It shows a disk blackbody spectrum at unusually low luminosities, which suggests that the inner region of the disk is obscured and only the scattered emission can be observed (Shaw et al. 2022). In addition, narrow emission lines, including Fe XXVI Lya and Fe XXV Hea, were detected with Chandra/HETG in 2020 (Shaw et al. 2022). In the Chandra observations, some of the low-energy lines such as Mg XII and Si XVI were found to have potential blueshifted absorption lines (i.e., p-Cygni profiles), suggesting that their origin is a disk wind with a large solid angle, perhaps a spherical geometry.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '901001010' / Observation identification string OBJECT = 'V4641_Sgr' / Object name OBSERVER= 'XRISM Collaboration' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 274.8401 / [deg] Object Right ascension DEC_OBJ = -25.4072 / [deg] Object Declination RA_PNT = 274.855067030617 / Pointing RA DEC_PNT = -25.4009043951645 / Pointing DEC RA_NOM = 274.840452988679 / [deg] Nominal aspect point R.A. DEC_NOM = -25.4071921361131 / [deg] Nominal aspect point Dec. PA_NOM = 268.197734963899 / [deg] Nominal aspect point roll. TELAPSE = 20244 / Elapsed time DATE-OBS= '2024-09-30T10:53:18' / Start date DATE-END= '2024-09-30T16:30:42' / Stop date ONTIME = 12171.790618 / On-source time EXPOSURE= 12171.790618 / 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 = '2024-10-04T05:14:16' / Date and time this file was created or updated SIB2_VER= 'V03.01 ' / SIB2 version JAXA