2025A&A...703A..19C

Query : 2025A&A...703A..19C

2025A&A...703A..19C - Astronomy and Astrophysics, volume 703A19 (2025/11-1)

Unveiling blazar synchrotron emission: A multiwavelength polarimetric study of high-synchrotron and low-synchrotron peaked populations.

CAPECCHIACCI S., LIODAKIS I., MIDDEI R., KIM D.E., DI GESU L., AGUDO I., AGIS-GONZALEZ B., ARBET-ENGELS A., BLINOV D., CHEN C.-T., EHLERT S.R., GAU E., HECKMANN L., HU K., JORSTAD S.G., KAARET P., KOUCH P.M., KRAWCZYNSKI H., LINDFORS E., MARIN F., MARSCHER A.P., MYSERLIS I., O'DELL S.L., PACCIANI L., PANEQUE D., PERRI M., PUCCETTI S., SAADE M.L., TAVECCHIO F., TENNANT A.F., TRAIANOU E., WEISSKOPF M.C., WU K., ACEITUNO F.J., BONNOLI G., CASANOVA V., EMERY G., ESCUDERO J., MORCUENDE D., OTERO-SANTOS J., SOTA A., PIIROLA V., BORMAN G.A., KOPATSKAYA E.N., LARIONOVA E.G., MOROZOVA D.A., SHISHKINA E.V., SAVCHENKO S.S., VASILYEV A.A., GRISHINA T.S., TROITSKIY I.S., ZHOVTAN A.V., McCALL C., JERMAK H.E., STEELE I.A., BACHEV R., STRIGACHEV A., IMAZAWA R., SASADA M., FUKAZAWA Y., KAWABATA K.S., UEMURA M., MIZUNO T., NAKAOKA T., TOCHIHARA S., AKAI T., AKITAYA H., BERDYUGIN A.V., KAGITANI M., KRAVTSOV V., POUTANEN J., SAKANOI T., ALVAREZ-ORTEGA D., CASADIO C., KANG S., LEE S.-S., KIM S., CHEONG W.Y., JEONG H.-W., SONG C., LI S., NAM M.-S., GURWELL M., KEATING G., RAO R., ANGELAKIS E., KRAUS A., BENKE P., DEBBRECHT L., EICH J., EPPEL F., GOKUS A., HAMMERICH S., HESSDORFER J., KADLER M., KIRCHNER D., PARASCHOS G.F., ROSCH F. and SCHULGA W.

Abstract (from CDS):

The polarimetric properties of blazars enable us to place constraints on the acceleration mechanisms that fuel their powerful jets. By studying the multiwavelength polarimetric behaviour of high-synchrotron peaked (HSP) and low-synchrotron peaked (LSP) blazars, we aim to explore differences in their emission mechanisms and magnetic field structure in the acceleration region. In this study, we take advantage of several X-ray polarisation observations of HSP by the IXPE, including four new observations of Mrk 501, along with optical polarisation observations of LSP from RoboPol and other instruments. We find that the polarisation degree (PD) distribution of HSP in X-rays is systematically higher than in optical and mm-radio wavelengths, as reported in previous IXPE publications. The distribution of the X-ray electric vector position angles (PA) is centred around the jet axis with most of the observations consistent with zero difference within uncertainties. In fact, the distribution of the offset of the PA from the jet axis is consistent between the LSP and HSP populations (with PA measured in optical for the first, X-ray for the latter), suggesting a common magnetic field structure close to the acceleration region. These results offer strong support for the emerging energy stratified scenario of particle acceleration followed by energy loss in blazar jets.

Abstract Copyright: © The Authors 2025

Journal keyword(s): techniques: polarimetric - Galaxy: nucleus - galaxies: active - BL Lacertae objects: general - galaxies: jets

Simbad objects: 17

Full paper

View the references in ADS

Number of rows : 17

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	RX J0232.8+2017	BLL	02 32 48.6148874688	+20 17 17.486717388			18.00	13.96	~	387	1
2	QSO B0420-0127	Bla	04 23 15.80072217	-01 20 33.0656073		17.50	17.00	16.28	~	1263	3
3	4C 71.07	Bla	08 41 24.36528508	+70 53 42.1730435			17.30	16.8	~	818	1
4	Z 184-50	BLL	11 04 27.3140835504	+38 12 31.798495872		13.50	12.90	8.31	~	2841	1
5	3C 273	BLL	12 29 06.6998257176	+02 03 08.597629980		13.05	14.830	14.11	~	6022	1
6	QSO J1512-0906	Bla	15 12 50.53293048	-09 05 59.8297908		16.74	16.54		~	1409	1
7	PG 1553+113	BLL	15 55 43.0440048528	+11 11 24.365649948	14.91	14.72	14.57	13.99	~	672	1
8	4C 38.41	Bla	16 35 15.49297809	+38 08 04.5005995		18.14	17.97	17.25	~	906	1
9	3C 345	Bla	16 42 58.80997043	+39 48 36.9939552		16.81	16.59	16.84	~	1808	3
10	Z 225-7	BLL	16 53 52.21668403	+39 45 36.6088754	14.09	14.15	13.29	8.26	~	2304	2
11	4C 09.57	BLL	17 51 32.81857326	+09 39 00.7284066		17.46	16.78	15.57	~	1007	1
12	QSO B1959+650	BLL	19 59 59.8520303688	+65 08 54.652536492			12.8	11.21	~	699	2
13	PKS J2158-3013	BLL	21 58 52.0652249880	-30 13 32.118447792		13.36	13.09	12.62	~	1829	1
14	NAME BL Lac	BLL	22 02 43.2913536816	+42 16 39.979416792		15.66	14.72		~	2397	1
15	3C 446	BLL	22 25 47.25929101	-04 57 01.3907626		18.83	18.39	16.3	~	863	1
16	4C 11.69	Bla	22 32 36.40890093	+11 43 50.9040592		17.75	17.33		~	1205	2
17	3C 454.3	Bla	22 53 57.7480438728	+16 08 53.561508864		16.57	16.10	15.22	~	3004	2

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