2024A&A...684A.137F

Query : 2024A&A...684A.137F

2024A&A...684A.137F - Astronomy and Astrophysics, volume 684A137 (2024/4-1)

Discovery of a variable energy-dependent X-ray polarization in the accreting neutron star GX 5-1.

FABIANI S., CAPITANIO F., IARIA R., POUTANEN J., GNARINI A., URSINI F., FARINELLI R., BOBRIKOVA A., STEINER J.F., SVOBODA J., ANITRA A., BAGLIO M.C., CAROTENUTO F., DEL SANTO M., FERRIGNO C., LEWIS F., RUSSELL D.M., RUSSELL T.D., VAN DEN EIJNDEN J., COCCHI M., DI MARCO A., LA MONACA F., LIU K., RANKIN J., WEISSKOPF M.C., XIE F., BIANCHI S., BURDERI L., DI SALVO T., EGRON E., ILLIANO G., KAARET P., MATT G., MIKUSINCOVA R., MULERI F., PAPITTO A., 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., NEGRO M., NG C.-Y., O'DELL S.L., OMODEI N., OPPEDISANO C., PAVLOV G.G., PEIRSON A.L., PERRI M., PESCE-ROLLINS M., PETRUCCI P.-O., PILIA M., POSSENTI A., PUCCETTI S., RAMSEY B.D., 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., WU K. and ZANE S.

Abstract (from CDS):

We report on the coordinated observations of the neutron star low-mass X-ray binary (NS-LMXB) GX 5-1 in X-rays (IXPE, NICER, NuSTAR, and INTEGRAL), optical (REM and LCO), near-infrared (REM), mid-infrared (VLT VISIR), and radio (ATCA). This Z-source was observed by IXPE twice in March-April 2023 (Obs. 1 and 2). In the radio band the source was detected, but only upper limits to the linear polarization were obtained at a 3σ level of 6.1% at 5.5 GHz and 5.9% at 9 GHz in Obs. 1 and 12.5% at 5.5 GHz and 20% at 9 GHz in Obs. 2. The mid-IR, near-IR, and optical observations suggest the presence of a compact jet that peaks in the mid- or far-IR. The X-ray polarization degree was found to be 3.7%±0.4% (at 90% confidence level) during Obs. 1 when the source was in the horizontal branch of the Z-track and 1.8%±0.4% during Obs. 2 when the source was in the normal-flaring branch. These results confirm the variation in polarization degree as a function of the position of the source in the color-color diagram, as for previously observed Z-track sources (Cyg X-2 and XTE 1701-462). Evidence of a variation in the polarization angle of ∼20° with energy is found in both observations, likely related to the different, nonorthogonal polarization angles of the disk and Comptonization components, which peak at different energies.

Abstract Copyright: © The Authors 2024

Journal keyword(s): accretion, accretion disks - stars: neutron - X-rays: binaries - X-rays: general - X-rays: individuals: GX 5-1

Simbad objects: 22

goto Full paper

goto View the references in ADS

Number of rows : 22
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
2 V* V1055 Ori LXB 06 17 07.3565603963 +09 08 13.515857360   18.80 18.5     ~ 594 1
3 HD 130157 * 14 47 13.6499854233 -21 19 29.544326147   7.677 6.034     K4/5III 31 0
4 V* BR Cir HXB 15 20 40.8532547060 -57 10 00.206639033   21.4 21.4     B5-A0I 849 1
5 * zet01 Lib * 15 28 15.4081976976 -16 42 59.347513656   7.161 5.626     K4.5III 51 0
6 * chi Sco * 16 13 50.9062585128 -11 50 15.892301544   6.615 5.239     K3III 83 0
7 V* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1730 0
8 [KRL2007b] 214 LXB 17 00 58.46 -46 11 08.6           ~ 296 0
9 1RXS J170855.6-440653 LXB 17 08 54.346 -44 06 08.38           ~ 406 1
10 V* V2216 Oph LXB 17 31 44.17 -16 57 40.9 16.40 17.10 16.8     ~ 329 1
11 NAME Slow Burster LXB 17 31 58.0 -33 49 58     15.50     ~ 865 1
12 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
13 4U 1758-25 LXB 18 01 09.7308060816 -25 04 44.120221284     11.08     ~ 705 1
14 2CXO J180112.3-254436 HXB 18 01 12.4783119670 -25 44 35.694663099           AV 417 1
15 SAX J1808.4-3658 LXB 18 08 27.58 -36 58 43.9           ~ 1051 0
16 V* V5512 Sgr LXB 18 14 31.3 -17 09 23     12.73     K5III 449 0
17 V* NP Ser LXB 18 16 01.7 -14 02 09   18.8       K 683 2
18 QSO J1820-2528 QSO 18 20 57.84869964 -25 28 12.5840414   18.56       ~ 115 1
19 * lam Sgr PM* 18 27 58.2407185 -25 25 18.114589 4.75 3.85 2.81 2.06 1.50 K1IIIb 290 0
20 V* V4634 Sgr LXB 18 29 28.8 -23 47 48 18.90 19.40 19     ~ 399 0
21 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
22 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 2024A&A...684A.137F and select 'bookmark this link' or equivalent in the popup menu