2023MNRAS.526.5964P

Query : 2023MNRAS.526.5964P

2023MNRAS.526.5964P - Mon. Not. R. Astron. Soc., 526, 5964-5975 (2023/December-3)

The first X-ray polarimetric observation of the black hole binary LMC X-1.

PODGORNY J., MARRA L., MULERI F., RODRIGUEZ CAVERO N., RATHEESH A., DOVCIAK M., MIKUSINCOVA R., BRIGITTE M., STEINER J.F., VELEDINA A., BIANCHI S., KRAWCZYNSKI H., SVOBODA J., KAARET P., MATT G., GARCIA J.A., PETRUCCI P.-O., LUTOVINOV A., SEMENA A., DI MARCO A., NEGRO M., WEISSKOPF M.C., INGRAM A., POUTANEN J., BEHESHTIPOUR B., CHUN S., HU K., MIZUNO T., SIXUAN Z., 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., CAPITANIO F., CASTELLANO S., CAVAZZUTI E., CHEN C., CIPRINI S., COSTA E., DE ROSA A., DEL MONTE E., DI GESU L., DI LALLA N., DONNARUMMA I., DOROSHENKO V., EHLERT S.R., ENOTO T., EVANGELISTA Y., FABIANI S., FERRAZZOLI R., GUNJI S., 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., MARINUCCI A., MARSCHER A.P., MARSHALL H.L., MASSARO F., MITSUISHI I., 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., SOFFITTA P., SPANDRE G., SWARTZ D.A., TAMAGAWA T., TAVECCHIO F., TAVERNA R., TAWARA Y., TENNANT A.F., THOMAS N.E., TROIS A., TSYGANKOV S.S., TUROLLA R., VINK J., WU K. and XIE F.

Abstract (from CDS):

We report on an X-ray polarimetric observation of the high-mass X-ray binary LMC X-1 in the high/soft state, obtained by the Imaging X-ray Polarimetry Explorer (IXPE) in 2022 October. The measured polarization is below the minimum detectable polarization of 1.1 per cent (at the 99 per cent confidence level). Simultaneously, the source was observed with the Neutron Star Interior Composition Explorer (NICER), Nuclear Spectroscopic Telescope Array (NuSTAR), and Spectrum-Rontgen-Gamma (SRG)/Astronomical Roentgen Telescope - X-ray Concentrator (ART-XC) instruments, which enabled spectral decomposition into a dominant thermal component and a Comptonized one. The low 2-8 keV polarization of the source did not allow for strong constraints on the black hole spin and inclination of the accretion disc. However, if the orbital inclination of about 36° is assumed, then the upper limit is consistent with predictions for pure thermal emission from geometrically thin and optically thick discs. Assuming the polarization degree of the Comptonization component to be 0, 4, or 10 per cent, and oriented perpendicular to the polarization of the disc emission (in turn assumed to be perpendicular to the large-scale ionization cone orientation detected in the optical band), an upper limit to the polarization of the disc emission of 1.0, 0.9, or 0.9 per cent, respectively, is found (at the 99 per cent confidence level).

Abstract Copyright: © The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): accretion, accretion discs - black hole physics - polarization - scattering - X-rays: binaries - X-rays: individual: LMC X-1

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	NAME LMC	G	05 23 34.6	-69 45 22			0.4			~	19090	0
2	M 1	SNR	05 34 31.8	+22 01 03						~	6516	1
3	X LMC X-1	HXB	05 39 38.8284304464	-69 44 35.531553624		14.8	14.5	14.924		O8(f)p	700	0
4	MCG-05-23-016	Sy2	09 47 40.1332188528	-30 56 55.960779696		14.10	13.69	12.44		~	611	0
5	NAME Circinus Galaxy	Sy2	14 13 09.906	-65 20 20.47		10.89	9.84	10.6	10.0	~	1331	1
6	HD 226868	HXB	19 58 21.6757355952	+35 12 05.784512688	9.38	9.72	8.91	8.42		O9.7Iabpvar	4590	0
7	V* V1521 Cyg	HXB	20 32 25.78	+40 57 27.9						WN4/5-6/7	2035	2

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