2025PASJ...77S.117L

Query : 2025PASJ...77S.117L

2025PASJ...77S.117L - Publ. Astron. Soc. Jap., 77, 117-130 (2025/September-0)

The structure of the relativistic Fe line in GX 340+0 as viewed with XRISM/Resolve, NICER, and NuSTAR.

LUDLAM R.M., BALLHAUSEN R., CHAKRABORTY P., COSTANTINI E., CORRALES L., HALL H., KILBOURNE C.A., MOUTARD D.L., NAKAGAWA T., PORTER F.S., PSARADAKI I., SUDHA M., SMITH R.K., TAKAHASHI H., DONE C. and GARCIA J.A.

Abstract (from CDS):

We present a $152$ ks XRISM/Resolve observation of the persistently accreting Z source GX 340$+$0. Simultaneous observations also occurred with NuSTAR and NICER for $22.47$ ks and $2.7$ ks, respectively. The source covered the normal branch to the flaring branching during the observations. The data from all three missions were modeled concurrently for each spectral branch. The superior energy resolution of XRISM/Resolve reveals structure within the iron emission line complex regardless of spectral state. We model the reprocessed Fe K line with a reflection model tailored for thermal illumination of the accretion disk by a neutron star. The currently available model encompasses the broad components, but narrow emission features remain at the ${\sim}5\%$ level. These remaining features may be described by the presence of an ionized plasma in the system as has been observed in the Z source Cygnus X-2, but subsequent updates to the reflection model code may be able to explain these features.

Abstract Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. For commercial re-use, please contact for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site-for further information please contact

Journal keyword(s): accretion, accretion disks - stars: neutron - X-rays: binaries

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* BW Cir HXB 13 58 09.7227337579 -64 44 05.257858491           ~ 256 0
2 V* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1730 0
3 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 579 0
4 V* V801 Ara LXB 16 40 55.5976953528 -53 45 04.948107156 17.50 18.20 17.5   17.07 ~ 921 0
5 4U 1642-45 LXB 16 45 48.1 -45 36 42           ~ 467 1
6 X Ara X-1 LXB 17 06 15.2 -43 02 11           ~ 296 1
7 V* MM Ser LXB 18 39 57.8 +05 02 13   19.2 19.2     ~ 378 0
8 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0
9 V* V1341 Cyg LXB 21 44 41.1544345272 +38 19 17.066570988 15.00 15.13 14.68 15.00   A9III 1229 1

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