2023ApJ...948L..25P

Query : 2023ApJ...948L..25P

2023ApJ...948L..25P - Astrophys. J., 948, L25 (2023/May-2)

X-Ray Polarization of BL Lacertae in Outburst.

PEIRSON A.L., NEGRO M., LIODAKIS I., MIDDEI R., KIM D.E., MARSCHER A.P., MARSHALL H.L., PACCIANI L., ROMANI R.W., WU K., DI MARCO A., DI LALLA N., OMODEI N., JORSTAD S.G., AGUDO I., KOUCH P.M., LINDFORS E., ACEITUNO F.J., BERNARDOS M.I., BONNOLI G., CASANOVA V., GARCIA-COMAS M., AGIS-GONZALEZ B., HUSILLOS C., MARCHINI A., SOTA A., CASADIO C., ESCUDERO J., MYSERLIS I., SIEVERS A., GURWELL M., RAO R., IMAZAWA R., SASADA M., FUKAZAWA Y., KAWABATA K.S., UEMURA M., MIZUNO T., NAKAOKA T., AKITAYA H., CHEONG Y., JEONG H.-W., KANG S., KIM S.-H., LEE S.-S., ANGELAKIS E., KRAUS A., CIBRARIO N., DONNARUMMA I., POUTANEN J., TAVECCHIO F., 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., DOROSHENKO V., DOVCIAK M., EHLERT S.R., ENOTO T., EVANGELISTA Y., FABIANI S., FERRAZZOLI R., GARCIA J.A., GUNJI S., HAYASHIDA K., HEYL J., IWAKIRI W., KAARET P., KARAS V., KITAGUCHI T., KOLODZIEJCZAK J.J., KRAWCZYNSKI H., LA MONACA F., LATRONICO L., MADEJSKI G., MALDERA S., MANFREDA A., MARIN F., MARINUCCI A., MASSARO F., MATT G., MITSUISHI I., MULERI F., NG C.-Y., O'DELL S.L., OPPEDISANO C., PAPITTO A., PAVLOV G.G., PERRI M., PESCE-ROLLINS M., PETRUCCI P.-O., PILIA M., POSSENTI A., PUCCETTI S., RAMSEY B.D., RANKIN J., RATHEESH A., ROBERTS O.J., SGRO C., SLANE P., SOFFITTA P., SPANDRE G., SWARTZ D.A., TAMAGAWA T., TAVERNA R., TAWARA Y., TENNANT A.F., THOMAS N.E., TOMBESI F., TROIS A., TSYGANKOV S., TUROLLA R., VINK J., WEISSKOPF M.C., XIE F. and ZANE S.

Abstract (from CDS):

We report the first >99% confidence detection of X-ray polarization in BL Lacertae. During a recent X-ray/γ-ray outburst, a 287 ks observation (2022 November 27-30) was taken using the Imaging X-ray Polarimetry Explorer (IXPE), together with contemporaneous multiwavelength observations from the Neil Gehrels Swift observatory and XMM-Newton in soft X-rays (0.3-10 keV), NuSTAR in hard X-rays (3-70 keV), and optical polarization from the Calar Alto and Perkins Telescope observatories. Our contemporaneous X-ray data suggest that the IXPE energy band is at the crossover between the low- and high-frequency blazar emission humps. The source displays significant variability during the observation, and we measure polarization in three separate time bins. Contemporaneous X-ray spectra allow us to determine the relative contribution from each emission hump. We find >99% confidence X-ray polarization ${{\rm{\Pi }}}_{2\mbox{--}4\mathrm{keV}}={21.7}_{-7.9}^{+5.6} \% $ and electric vector polarization angle ψ2–4keV = -28.°7 ± 8.°7 in the time bin with highest estimated synchrotron flux contribution. We discuss possible implications of our observations, including previous IXPE BL Lacertae pointings, tentatively concluding that synchrotron self-Compton emission dominates over hadronic emission processes during the observed epochs.

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

Journal keyword(s): Astrophysical black holes - Black hole physics - Supermassive black holes - Active galactic nuclei - Active galaxies - Jets - Galaxy jets - Relativistic jets - Compact radiation sources - X-ray astronomy

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 QSO J0509+0541 BLL 05 09 25.9644373872 +05 41 35.333820420 15.32 14.95 14.78 15.12   ~ 458 2
2 IceCube-170922A ev 05 09.7 +05 43           ~ 148 0
3 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2265 1

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