2023ApJ...953L..22D

Query : 2023ApJ...953L..22D

2023ApJ...953L..22D - Astrophys. J., 953, L22 (2023/August-3)

First Detection of X-Ray Polarization from the Accreting Neutron Star 4U 1820-303.

DI MARCO A., LA MONACA F., POUTANEN J., RUSSELL T.D., ANITRA A., FARINELLI R., MASTROSERIO G., MULERI F., XIE F., BACHETTI M., BURDERI L., CAROTENUTO F., DEL SANTO M., DI SALVO T., DOVCIAK M., GNARINI A., IARIA R., KAJAVA J.J.E., LIU K., MIDDEI R., O'DELL S.L., PILIA M., RANKIN J., SANNA A., VAN DEN EIJNDEN J., WEISSKOPF M.C., BOBRIKOVA A., CAPITANIO F., COSTA E., KAARET P., MARINO A., SOFFITTA P., URSINI F., AMBROSINO F., COCCHI M., FABIANI S., MARSHALL H.L., MATT G., MOTTA S.E., PAPITTO A., STELLA L., TARANA A., ZANE S., AGUDO I., ANTONELLI L.A., BALDINI L., BAUMGARTNER W.H., BELLAZZINI R., BIANCHI S., BONGIORNO S.D., BONINO R., BREZ A., BUCCIANTINI N., CASTELLANO S., CAVAZZUTI E., CHEN C.-T., CIPRINI S., DE ROSA A., DEL MONTE E., DI GESU L., DI LALLA N., DONNARUMMA I., DOROSHENKO V., EHLERT S.R., ENOTO T., EVANGELISTA Y., FERRAZZOLI R., GARCIA J.A., GUNJI S., HAYASHIDA K., HEYL J., IWAKIRI W., JORSTAD S.G., KARAS V., KISLAT F., KITAGUCHI T., KOLODZIEJCZAK J.J., KRAWCZYNSKI H., LATRONICO L., LIODAKIS I., MALDERA S., MANFREDA A., MARIN F., MARINUCCI A., MARSCHER A.P., MASSARO F., MITSUISHI I., MIZUNO T., NEGRO M., NG C.-Y., OMODEI N., OPPEDISANO C., PAVLOV G.G., PEIRSON A.L., PERRI M., PESCE-ROLLINS M., PETRUCCI P.-O., POSSENTI A., PUCCETTI S., RAMSEY B.D., RATHEESH A., ROBERTS O.J., ROMANI R.W., SGRO C., SLANE P., SPANDRE G., SWARTZ D.A., TAMAGAWA T., TAVECCHIO F., TAVERNA R., TAWARA Y., TENNANT A.F., THOMAS N.E., TOMBESI F., TROIS A., TSYGANKOV S.S., TUROLLA R., VINK J., WU K. (The IXPE Collaboration)

Abstract (from CDS):

This paper reports the first detection of polarization in the X-rays for atoll-source 4U 1820-303, obtained with the Imaging X-ray Polarimetry Explorer (IXPE) at 99.999% confidence level (CL). Simultaneous polarimetric measurements were also performed in the radio with the Australia Telescope Compact Array. The IXPE observations of 4U 1820-303 were coordinated with Swift X-ray Telescope, Neutron Star Interior Composition Explorer, and Nuclear Spectroscopic Telescope Array aiming to obtain an accurate X-ray spectral model covering a broad energy interval. The source shows a significant polarization above 4 keV, with a polarization degree of 2.0% ± 0.5% and a polarization angle of -55° ± 7° in the 4-7 keV energy range, and a polarization degree of 10% ± 2% and a polarization angle of -67° ± 7° in the 7-8 keV energy bin. This polarization also shows a clear energy trend with polarization degree increasing with energy and a hint for a position-angle change of ≃90° at 96% CL around 4 keV. The spectro-polarimetric fit indicates that the accretion disk is polarized orthogonally to the hard spectral component, which is presumably produced in the boundary/spreading layer. We do not detect linear polarization from the radio counterpart, with a 3σ upper limit of 50% at 7.25 GHz.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Low-mass x-ray binary stars - Neutron stars - Polarimetry - Spectropolarimetry - Stellar accretion disks

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* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1730 0
2 [KRL2007b] 214 LXB 17 00 58.46 -46 11 08.6           ~ 296 0
3 V* V2216 Oph LXB 17 31 44.17 -16 57 40.9 16.40 17.10 16.8     ~ 329 1
4 QSO J1820-2528 QSO 18 20 57.84869964 -25 28 12.5840414   18.56       ~ 115 1
5 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
6 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 1056 1
7 V* V4634 Sgr LXB 18 29 28.8 -23 47 48 18.90 19.40 19     ~ 399 0
8 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
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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