2024A&A...684A..95M

Query : 2024A&A...684A..95M

2024A&A...684A..95M - Astronomy and Astrophysics, volume 684A95 (2024/4-1)

IXPE observation confirms a high spin in the accreting black hole 4U 1957+115.

MARRA L., BRIGITTE M., RODRIGUEZ CAVERO N., CHUN S., STEINER J.F., DOVCIAK M., NOWAK M., BIANCHI S., CAPITANIO F., INGRAM A., MATT G., MULERI F., PODGORNY J., POUTANEN J., SVOBODA J., TAVERNA R., URSINI F., VELEDINA A., DE ROSA A., GARCIA J.A., LUTOVINOV A.A., MEREMINSKIY I.A., FARINELLI R., GUNJI S., KAARET P., KALLMAN T., KRAWCZYNSKI H., KAN Y., HU K., MARINUCCI A., MASTROSERIO G., MIKUSINCOVA R., PARRA M., PETRUCCI P.-O., RATHEESH A., SOFFITTA P., TOMBESI F., ZANE S., AGUDO I., ANTONELLI L.A., BACHETTI M., BALDINI L., BAUMGARTNER W.H., BELLAZZINI R., BONGIORNO S.D., BONINO R., BREZ A., BUCCIANTINI N., CASTELLANO S., CAVAZZUTI E., CHEN C., CIPRINI S., COSTA E., DEL MONTE E., DI GESU L., DI LALLA N., DI MARCO A., DONNARUMMA I., DOROSHENKO V., EHLERT S.R., ENOTO T., EVANGELISTA Y., FABIANI S., FERRAZZOLI R., HAYASHIDA K., HEYL J., IWAKIRI W., JORSTAD S.G., KARAS V., KISLAT F., KITAGUCHI T., KOLODZIEJCZAK J.J., LA MONACA F., LATRONICO L., LIODAKIS I., MALDERA S., MANFREDA A., MARIN F., MARSCHER A.P., MARSHALL H.L., MASSARO F., MITSUISHI I., MIZUNO T., NEGRO M., NG C.Y., O'DELL S.L., OMODEI N., OPPEDISANO C., PAPITTO A., PAVLOV G.G., PEIRSON A.L., PERRI M., PESCE-ROLLINS M., PILIA M., POSSENTI A., PUCCETTI S., RAMSEY B.D., RANKIN J., ROBERTS O.J., ROMANI R.W., SGRO C., SLANE P., SPANDRE G., SWARTZ D.A., TAMAGAWA T., TAVECCHIO F., TAWARA Y., TENNANT A.F., THOMAS N.E., TROIS A., TSYGANKOV S.S., TUROLLA R., VINK J., WEISSKOPF M.C., WU K. and XIE F.

Abstract (from CDS):

We present the results of the first X-ray polarimetric observation of the low-mass X-ray binary 4U 1957+115, performed with the Imaging X-ray Polarimetry Explorer in May 2023. The binary system has been in a high-soft spectral state since its discovery and is thought to host a black hole. The ∼571 ks observation reveals a linear polarisation degree of 1.9%±0.6% and a polarisation angle of $ -41\!{{\overset{\circ}{.}}}8 \pm 7{{\overset{\circ}{.}}}9 $ in the 2-8 keV energy range. Spectral modelling is consistent with the dominant contribution coming from the standard accretion disc, while polarimetric data suggest a significant role of returning radiation: photons that are bent by strong gravity effects and forced to return to the disc surface, where they can be reflected before eventually reaching the observer. In this setting, we find that models with a black hole spin lower than 0.96 and an inclination lower than 50° are disfavoured.

Abstract Copyright: © The Authors 2024

Journal keyword(s): accretion - accretion disks - black hole physics - polarization - X-rays: binaries - X-rays: individuals: 4U 1957+115

Simbad objects: 7

Full paper

View the references in ADS

Number of rows : 7

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	X LMC X-3	HXB	05 38 56.6323605504	-64 05 03.317937504		17	17.2			B2.5Ve	722	0
2	X LMC X-1	HXB	05 39 38.8284304464	-69 44 35.531553624		14.8	14.5	14.924		O8(f)p	700	0
3	X Nor X-1	LXB	16 34 01.610	-47 23 34.80						~	579	0
4	NAME Aql Region	reg	18 31.1	-02 10						~	456	0
5	HD 226868	HXB	19 58 21.6757355952	+35 12 05.784512688	9.38	9.72	8.91	8.42		O9.7Iabpvar	4590	0
6	V* V1408 Aql	LXB	19 59 24.0074252040	+11 42 29.859773292	18.40	18.97	18.95	18.70	18.66	~	234	0
7	V* V1521 Cyg	HXB	20 32 25.78	+40 57 27.9						WN4/5-6/7	2035	2

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