2023A&A...676A..20U

Query : 2023A&A...676A..20U

2023A&A...676A..20U - Astronomy and Astrophysics, volume 676A20 (2023/8-1)

X-ray polarimetry and spectroscopy of the neutron star low-mass X-ray binary GX 9+9: An in-depth study with IXPE and NuSTAR.

URSINI F., FARINELLI R., GNARINI A., POUTANEN J., BIANCHI S., CAPITANIO F., DI MARCO A., FABIANI S., LA MONACA F., MALACARIA C., MATT G., MIKUSINCOVA R., COCCHI M., KAARET P., KAJAVA J.J.E., PILIA M., ZHANG W., 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.-T., CIPRINI S., COSTA E., DE ROSA A., DEL MONTE E., DI GESU L., DI LALLA N., DONNARUMMA I., DOROSHENKO V., DOVCIAK M., 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., MARSHALL H.L., MASSARO F., 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., TSYGANKOV S.S., TUROLLA R., VINK J., WEISSKOPF M.C., WU K., XIE F. and ZANE S.

Abstract (from CDS):

We report on a comprehensive analysis of simultaneous X-ray polarimetric and spectral data of the bright atoll source GX 9+9 with the Imaging X-ray Polarimetry Explorer (IXPE) and NuSTAR. The source is significantly polarized in the 4-8 keV band, with a degree of 2.2% ± 0.5% (uncertainty at the 68% confidence level). The NuSTAR broad-band spectrum clearly shows an iron line, and is well described by a model including thermal disc emission, a Comptonized component, and reflection. From a spectro-polarimetric fit, we obtain an upper limit to the polarization degree of the disc of 4% (at the 99% confidence level), while the contribution of Comptonized and reflected radiation cannot be conclusively separated. However, the polarization is consistent with resulting from a combination of Comptonization in a boundary or spreading layer, plus reflection off the disc, which significantly contributes in any realistic scenario.

Abstract Copyright: © The Authors 2023

Journal keyword(s): accretion, accretion disks - stars: neutron - polarization - X-rays: general - X-rays: binaries - X-rays: individuals: GX 9+9

Simbad objects: 5

Full paper

View the references in ADS

Number of rows : 5

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	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	V* V4634 Sgr	LXB	18 29 28.8	-23 47 48	18.90	19.40	19		~	399	0
5	V* V1341 Cyg	LXB	21 44 41.1544345272	+38 19 17.066570988	15.00	15.13	14.68	15.00	A9III	1229	1

To bookmark this query, right click on this link: simbad:objects in 2023A&A...676A..20U and select 'bookmark this link' or equivalent in the popup menu