2023ApJ...958L...8R

Query : 2023ApJ...958L...8R

2023ApJ...958L...8R - Astrophys. J., 958, L8 (2023/November-3)

The First X-Ray Polarization Observation of the Black Hole X-Ray Binary 4U 1630-47 in the Steep Power-law State.

RODRIGUEZ CAVERO N., MARRA L., KRAWCZYNSKI H., DOVCIAK M., BIANCHI S., STEINER J.F., SVOBODA J., CAPITANIO F., MATT G., NEGRO M., INGRAM A., VELEDINA A., TAVERNA R., KARAS V., URSINI F., PODGORNY J., RATHEESH A., SULEIMANOV V., MIKUSINCOVA R., ZANE S., KAARET P., MULERI F., POUTANEN J., MALACARIA C., PETRUCCI P.-O., GAU E., HU K., CHUN S., 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., DI MARCO A., DONNARUMMA I., DOROSHENKO V., EHLERT S.R., ENOTO T., EVANGELISTA Y., FABIANI S., FERRAZZOLI R., GARCIA J.A., GUNJI S., HAYASHIDA K., HEYL J., IWAKIRI W., JORSTAD S.G., KISLAT F., KITAGUCHI T., KOLODZIEJCZAK J.J., LA MONACA F., LATRONICO L., LIODAKIS I., MALDERA S., MANFREDA A., MARIN F., MARINUCCI A., MARSCHER A.P., MARSHALL H.L., MASSARO F., MITSUISHI I., MIZUNO T., 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., ROBERTS O.J., ROMANI R.W., SGRO C., SLANE P., SPANDRE G., SOFFITTA P., SWARTZ D.A., TAMAGAWA T., TAVECCHIO F., TAWARA Y., TENNANT A.F., THOMAS N.E., TOMBESI F., TROIS A., TSYGANKOV S.S., TUROLLA R., VINK J., WEISSKOPF M.C., WU K. and XIE F.

Abstract (from CDS):

The Imaging X-ray Polarimetry Explorer (IXPE) observed the black hole X-ray binary 4U 1630-47 in the steep power-law (or very high) state. The observations reveal a linear polarization degree of the 2-8 keV X-rays of 6.8% ± 0.2% at a position angle of 21.°3 ± 0.°9 east of north (all errors at 1σ confidence level). Whereas the polarization degree increases with energy, the polarization angle stays constant within the accuracy of our measurements. We compare the polarization of the source in the steep power-law state with the previous IXPE measurement of the source in the high soft state. We find that, even though the source flux and spectral shape are significantly different between the high soft state and the steep power-law state, their polarization signatures are similar. Assuming that the polarization of both the thermal and power-law emission components are constant over time, we estimate the power-law component polarization to be 6.8%-7.0% and note that the polarization angle of the thermal and power-law components must be approximately aligned. We discuss the implications for the origin of the power-law component and the properties of the emitting plasma.

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

Journal keyword(s): X-ray astronomy - Polarimetry - Stellar mass black holes - High energy astrophysics

Simbad objects: 4

goto Full paper

goto View the references in ADS

Number of rows : 4
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 X LMC X-1 HXB 05 39 38.8284304464 -69 44 35.531553624   14.8 14.5 14.924   O8(f)p 700 0
2 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 579 0
3 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0
4 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2

To bookmark this query, right click on this link: simbad:objects in 2023ApJ...958L...8R and select 'bookmark this link' or equivalent in the popup menu