2023A&A...675A..29M

Query : 2023A&A...675A..29M

2023A&A...675A..29M - Astronomy and Astrophysics, volume 675A29 (2023/7-1)

A polarimetrically oriented X-ray stare at the accreting pulsar EXO 2030+375.

MALACARIA C., HEYL J., DOROSHENKO V., TSYGANKOV S.S., POUTANEN J., FORSBLOM S.V., CAPITANIO F., DI MARCO A., DU Y., DUCCI L., LA MONACA F., LUTOVINOV A.A., MARSHALL H.L., MEREMINSKIY I.A., MOLKOV S.V., MUSHTUKOV A.A., NG M., PETRUCCI P.-O., SANTANGELO A., SHTYKOVSKY A.E., SULEIMANOV V.F., AGUDO I., ANTONELLI L.A., BACHETTI M., 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., COSTA E., DE ROSA A., DEL MONTE E., DI GESU L., DI LALLA N., DONNARUMMA I., DOVCIAK M., EHLERT S.R., ENOTO T., EVANGELISTA Y., FABIANI S., FERRAZZOLI R., GARCIA J.A., GUNJI S., HAYASHIDA K., IWAKIRI W., JORSTAD S.G., KAARET P., 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., MATT G., MITSUISHI I., MIZUNO T., MULERI F., 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., RATHEESH A., 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., TOMBESI F., TROIS A., TUROLLA R., VINK J., WEISSKOPF M.C., WU K., XIE F. and ZANE S.

Abstract (from CDS):

Accreting X-ray pulsars (XRPs) are presumed to be ideal targets for polarization measurements, as their high magnetic field strength is expected to polarize the emission up to a polarization degree of ∼80%. However, such expectations are being challenged by recent observations of XRPs with the Imaging X-ray Polarimeter Explorer (IXPE). Here, we report on the results of yet another XRP, namely, EXO 2030+375, observed with IXPE and contemporarily monitored with Insight-HXMT and SRG/ART-XC. In line with recent results obtained with IXPE for similar sources, an analysis of the EXO 2030+375 data returns a low polarization degree of 0%-3% in the phase-averaged study and a variation in the range of 2%-7% in the phase-resolved study. Using the rotating vector model, we constrained the geometry of the system and obtained a value of ∼60° for the magnetic obliquity. When considering the estimated pulsar inclination of ∼130°, this also indicates that the magnetic axis swings close to the observer's line of sight. Our joint polarimetric, spectral, and timing analyses hint toward a complex accreting geometry, whereby magnetic multipoles with an asymmetric topology and gravitational light bending significantly affect the behavior of the observed source.

Abstract Copyright: © The Authors 2023

Journal keyword(s): magnetic fields - polarization - stars: neutron - X-rays: binaries - pulsars: individual: EXO 2030+375

Simbad objects: 6

Full paper

View the references in ADS

Number of rows : 6

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* GP Vel	HXB	09 02 06.8608812864	-40 33 16.899168060	6.85	7.37	6.87	6.31	6.05	B0.5Ia	1588	0
2	GRO J1008-571	HXB	10 09 46.9642314696	-58 17 35.603851848				14.63		B0e	269	0
3	V* V779 Cen	HXB	11 21 15.0920532528	-60 37 25.630264596		14.4	12.27			O9III/Veq	1159	0
4	V* KZ TrA	LXB	16 32 16.79	-67 27 39.3	17.40	18.60	18.5			~	626	1
5	V* HZ Her	LXB	16 57 49.8110126616	+35 20 32.486555472	11.90	14.89	13.63	13.88		B3/6ep	2172	0
6	V* V2246 Cyg	HXB	20 32 15.2749858128	+37 38 14.843024844		22.16	19.41	17.32	15.18	B0Ve	480	0

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