XRISM XTEND observation 201052010

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XRISM/Xtend Transient Search (XTS)

Transient sources detected in this observation and reported through The Astronomer's Telegram.

ATel #17092

XRISM/Xtend Transient Search (XTS) detected an X-ray flare at the galactic center

Date 2025-03-20
Author(s) Yoneyama et al.
Coordinates RA = 266.761 deg, Dec = -28.538 deg
Reported flux 2e-12 erg cm−2 s−1

Title

THE ORIGIN OF THE NEUTRAL FE LINE IN THE GALACTIC CENTER EXPLORED BY NEW SPECTRAL FEATURES

Abstract

The most characteristic spectral features of the Galactic center are bright fluorescence X-rays at 6.4 keV emitted from neutral Fe atoms in molecular clouds. Photoionization by X-rays from Sagittarius A* has been considered as its origin (the XRNe scenario). On the other hand, the Galactic center should have a high density of low-energy cosmic rays (CRs), and thus there is still a strong possibility that the neutral Fe line is due to CR bombardment. In this observation, we will explore new spectral features that could never be observed by X-ray CCD energy resolutions, and measure neutral emission lines from other elements so that we will quantitatively clarify the ratio of the XRNe and CR origins.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'XTEND   '           / Instrument name
OBS_ID  = '201052010'          / Observation identification string
OBJECT  = 'RADIO_ARC'          / Object name
OBSERVER= 'KUMIKO NOBUKAWA'    / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =             266.5968 / [deg] Object Right ascension
DEC_OBJ =              -28.895 / [deg] Object Declination
RA_PNT  =      266.59481527484 / Pointing RA
DEC_PNT =    -28.8979072868998 / Pointing DEC
RA_NOM  =     266.596274365475 / [deg] Nominal aspect point R.A.
DEC_NOM =    -28.8956773631294 / [deg] Nominal aspect point Dec.
PA_NOM  =     80.0005030676141 / [deg] Nominal aspect point roll.
TELAPSE =     260593.963135988 / Elapsed time
DATE-OBS= '2025-03-16T16:54:16.036864' / Start date
DATE-END= '2025-03-19T17:17:30' / Stop date
ONTIME  =         116670.05525 / On-source time
EXPOSURE=         116670.05525 / Exposure time
PROCVER = '03.00.013.010'      / 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= 'gen20241115_xtd20241115_rsl20241115' / Version of CALDB used
DATE    = '2025-03-29T01:06:39' / Date and time this file was created or updated
SIB2_VER= 'V03.01  '           / SIB2 version JAXA

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