2024ApJ...968...76I

Query : 2024ApJ...968...76I

2024ApJ...968...76I - Astrophys. J., 968, 76 (2024/June-3)

Tracking the X-Ray Polarization of the Black Hole Transient Swift J1727.8-1613 during a State Transition.

INGRAM A., BOLLEMEIJER N., VELEDINA A., DOVCIAK M., POUTANEN J., EGRON E., RUSSELL T.D., TRUSHKIN S.A., NEGRO M., RATHEESH A., CAPITANIO F., CONNORS R., NEILSEN J., KRAUS A., IACOLINA M.N., PELLIZZONI A., PILIA M., CAROTENUTO F., MATT G., MASTROSERIO G., KAARET P., BIANCHI S., GARCIA J.A., BACHETTI M., WU K., COSTA E., EWING M., KRAVTSOV V., KRAWCZYNSKI H., LOKTEV V., MARINUCCI A., MARRA L., MIKUSINCOVA R., NATHAN E., PARRA M., PETRUCCI P.-O., RIGHINI S., SOFFITTA P., STEINER J.F., SVOBODA J., TOMBESI F., TUGLIANI S., URSINI F., YANG Y.-J., ZANE S., ZHANG W., AGUDO I., ANTONELLI L.A., 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., 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., GUNJI S., HAYASHIDA K., HEYL J., IWAKIRI W., JORSTAD S.G., KARAS V., KISLAT F., KITAGUCHI T., KOLODZIEJCZAK J.J., LA MONACA F., LATRONICO L., LIODAKIS I., MALDERA S., MANFREDA A., MARIN F., MARSCHER A.P., MARSHALL H.L., MASSARO F., MITSUISHI I., MIZUNO T., MULERI F., NG C.-Y., O'DELL S.L., OMODEI N., OPPEDISANO C., PAPITTO A., PAVLOV G.G., PEIRSON A.L., PERRI M., PESCE-ROLLINS M., POSSENTI A., PUCCETTI S., RAMSEY B.D., RANKIN J., ROBERTS O.J., ROMANI R.W., SGRO C., SLANE P., SPANDRE G., SWARTZ D.A., TAMAGAWA T., TAVECCHIO F., TAVERNA R., TAWARA Y., TENNANT A.F., THOMAS N.E., TROIS A., TSYGANKOV S.S., TUROLLA R., VINK J., WEISSKOPF M.C., XIE F. (The IXPE Collaboration)

Abstract (from CDS):

We report on an observational campaign on the bright black hole (BH) X-ray binary Swift J1727.8-1613 centered around five observations by the Imaging X-ray Polarimetry Explorer. These observations track for the first time the evolution of the X-ray polarization of a BH X-ray binary across a hard to soft state transition. The 2-8 keV polarization degree decreased from ∼4% to ∼3% across the five observations, but the polarization angle remained oriented in the north-south direction throughout. Based on observations with the Australia Telescope Compact Array, we find that the intrinsic 7.25 GHz radio polarization aligns with the X-ray polarization. Assuming the radio polarization aligns with the jet direction (which can be tested in the future with higher-spatial-resolution images of the jet), our results imply that the X-ray corona is extended in the disk plane, rather than along the jet axis, for the entire hard intermediate state. This in turn implies that the long (≳10 ms) soft lags that we measure with the Neutron star Interior Composition ExploreR are dominated by processes other than pure light-crossing delays. Moreover, we find that the evolution of the soft lag amplitude with spectral state does not follow the trend seen for other sources, implying that Swift J1727.8-1613 is a member of a hitherto undersampled subpopulation.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Accretion - X-ray astronomy - Low-mass x-ray binary stars - Polarimetry - Astrophysical black holes

Simbad objects: 14

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Number of rows : 14
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 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 2C 553 QSO 06 27 10.125 -05 53 06.21           ~ 165 1
3 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
4 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 579 0
5 V* V821 Ara LXB 17 02 49.3876391280 -48 47 23.087954544         15.322 ~ 2237 0
6 SWIFT J1727.8-1613 HXB 17 27 43.3135483931 -16 12 19.062182343           ~ 140 0
7 QSO B1730-130 Bla 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1198 1
8 MAXI J1803-298 BH? 18 03 41.0 -29 48 14           ~ 69 0
9 MAXI J1820+070 LXB 18 20 21.9423816480 +07 11 07.284859440           ~ 511 0
10 EXO 1846-031 LXB 18 49 17.1 -03 03 44           ~ 114 0
11 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2810 0
12 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
13 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0
14 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1

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