2023A&A...677A..57D

Query : 2023A&A...677A..57D

2023A&A...677A..57D - Astronomy and Astrophysics, volume 677A57 (2023/9-1)

Complex variations in X-ray polarization in the X-ray pulsar LS V +44 17/RX J0440.9+4431.

DOROSHENKO V., POUTANEN J., HEYL J., TSYGANKOV S.S., CAIAZZO I., TUROLLA R., VELEDINA A., WEISSKOPF M.C., FORSBLOM S.V., GONZALEZ-CANIULEF D., LOKTEV V., MALACARIA C., MUSHTUKOV A.A., SULEIMANOV V.F., LUTOVINOV A.A., MEREMINSKIY I.A., MOLKOV S.V., SALGANIK A., SANTANGELO A., BERDYUGIN A.V., KRAVTSOV V., NITINDALA A.P., 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., CAPITANIO F., CASTELLANO S., CAVAZZUTI E., CHEN C.-T., CIPRINI S., COSTA E., DE ROSA A., DEL MONTE E., DI GESU L., DI LALLA N., DI MARCO A., 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., LA MONACA F., LATRONICO L., LIODAKIS I., MALDERA S., MANFREDA A., MARIN F., MARINUCCI A., MARSCHER A.P., MARSHALL H.L., 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., PETRUCCI P.-O., 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., VINK J., WU K., XIE F. and ZANE S.

Abstract (from CDS):

We report on Imaging X-ray polarimetry explorer (IXPE) observations of the Be-transient X-ray pulsar LS V +44 17/RX J0440.9+4431 made at two luminosity levels during the giant outburst in January-February 2023. Considering the observed spectral variability and changes in the pulse profiles, the source was likely caught in supercritical and subcritical states with significantly different emission-region geometry, associated with the presence of accretion columns and hot spots, respectively. We focus here on the pulse-phase-resolved polarimetric analysis and find that the observed dependencies of the polarization degree and polarization angle (PA) on the pulse phase are indeed drastically different for the two observations. The observed differences, if interpreted within the framework of the rotating vector model (RVM), imply dramatic variations in the spin axis inclination, the position angle, and the magnetic colatitude by tens of degrees within the space of just a few days. We suggest that the apparent changes in the observed PA phase dependence are predominantly related to the presence of an unpulsed polarized component in addition to the polarized radiation associated with the pulsar itself. We then show that the observed PA phase dependence in both observations can be explained with a single set of RVM parameters defining the pulsar's geometry. We also suggest that the additional polarized component is likely produced by scattering of the pulsar radiation in the equatorial disk wind.

Abstract Copyright: © The Authors 2023

Journal keyword(s): accretion - accretion disks - magnetic fields - pulsars: individual: RX J0440.9+4431 - stars: neutron - X-rays: binaries

Simbad objects: 1

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Number of rows : 1

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	LS V +44 17	HXB	04 40 59.3296237272	+44 31 49.258049376	11.02	11.42	10.73	10.28	9.76	B0.2Ve	176	0

Query : 2023A&A...677A..57D

Basic data :

LS V +44 17 -- High Mass X-ray Binary

UV (), * (ALS,BSD,...), X (2022MNRAS,1ES,...), HXB (2010A&A), Em* (EM*,[KW97]), Be* (2014MNRAS), N* (2014MNRAS), V* (2012A&A), gam (INTREF), NIR (2MASS)

04 40 59.3296237272 +44 31 49.258049376 (Optical) [ 0.0119 0.0084 90 ] A 2020yCat.1350....0G

04 37 24.0140653630 +44 26 03.304249544 [ 0.0119 0.0084 90 ]

159.8470974664915 -01.2700173742888 [ 0.0119 0.0084 90 ]

0.101 -1.186 [0.016 0.014 90] A 2020yCat.1350....0G

0.3788 [0.015] A 2020yCat.1350....0G

B0.2Ve C 2005A&A...440.1079R

U 11.02 [~] D 2003AJ....125.2531R

B 11.42 [~] D 2015A&A...574A..33R

V 10.73 [~] D 2015A&A...574A..33R

R 10.28 [~] D 2015A&A...574A..33R

G 10.403856 [0.003518] C 2020yCat.1350....0G

I 9.76 [~] D 2015A&A...574A..33R

J 9.500 [0.023] C 2003yCat.2246....0C

H 9.317 [0.030] C 2003yCat.2246....0C

K 9.182 [0.018] C 2003yCat.2246....0C

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`1ES 0437+44.4`	`GSC 02905-00121`	`1RXS J044100.3+443137`	`UBV M 49963`
`ALS 8023`	`INTREF 202`	`SRGA J044059.4+443153`	`UCAC2 47040680`
`BSD 24-491`	`Lan 502`	`SWIFT J0440.8+4432`	`1WGA J0440.9+4431`
`CSI+44-04374`	`LS V +44 17`	`2SXPS J044059.2+443149`	`4XMM J044059.1+443149`
*`EM VES 826`**	`2MASS J04405932+4431492`	`TIC 410336237`	`[KW97] 18-55`
`GCRV 55295`	`PBC J0440.9+4432`	`TYC 2905-121-1`	`Gaia DR2 252878401557369088`
`GEN# +7.30240491`	`RX J0440.9+4431`	`UBV 4478`	`Gaia DR3 252878401557369088`

References (176 between 1850 and 2026) (Total 176)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : LS V +44 17

Link by name to the catalogue in VizieR :

`ALS 8023`	`GSC 02905-00121`	`Lan 502`	`LS V +44 17`	`2MASS J04405932+4431492`
`1RXS J044100.3+443137`	`TYC 2905-121-1`	`UCAC2 47040680`	`Gaia DR2 252878401557369088`	`Gaia DR3 252878401557369088`

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