2025A&A...699A.265G


Query : 2025A&A...699A.265G

2025A&A...699A.265G - Astronomy and Astrophysics, volume 699A265 (2025/7-1)

First polarization study of the M87 jet and active galactic nuclei at submillimeter wavelengths with ALMA.

GODDI C., CARLOS D.F., CREW G.B., MATTHEWS L.D., MESSIAS H., MUS A., MARTI-VIDAL I., ALBENTOSA-RUIZ E., DE LAURENTIS M., LIUZZO E., MARCHILI N., RYGL K.L.J., AKIYAMA K., ALBERDI A., ALEF W., ALGABA J.C., ANANTUA R., ASADA K., AZULAY R., BACH U., BACZKO A.-K., BALL D., BALOKOVIC M., BANDYOPADHYAY B., BARRETT J., BAUBOCK M., BENSON B.A., BINTLEY D., BLACKBURN L., BLUNDELL R., BOUMAN K.L., BOWER G.C., BREMER M., BRISSENDEN R., BRITZEN S., BRODERICK A.E., BROGUIERE D., BRONZWAER T., BUSTAMANTE S., CARLSTROM J.E., CHAEL A., CHAN C.-K., CHANG D.O., CHATTERJEE K., CHATTERJEE S., CHEN M.-T., CHEN Y., CHENG X., CHO I., CHRISTIAN P., CONROY N.S., CONWAY J.E., CRAWFORD T.M., CRUZ-OSORIO A., CUI Y., CURD B., DAHALE R., DAVELAAR J., DEANE R., DEMPSEY J., DESVIGNES G., DEXTER J., DHRUV V., DIHINGIA I.K., DOELEMAN S.S., DZIB S.A., EATOUGH R.P., EMAMI R., FALCKE H., FARAH J., FISH V.L., FOMALONT E., FORD H.A., FOSCHI M., FRAGA-ENCINAS R., FREEMAN W.T., FRIBERG P., FROMM C.M., FUENTES A., GALISON P., GAMMIE C.F., GARCIA R., GENTAZ O., GEORGIEV B., GOLD R., GOMEZ-RUIZ A.I., GOMEZ J.L., GU M., GURWELL M., HADA K., HAGGARD D., HESPER R., HEUMANN D., HO L.C., HO P., HONMA M., HUANG C.-W.L., HUANG L., HUGHES D.H., IKEDA S., IMPELLIZZERI C.M.V., INOUE M., ISSAOUN S., JAMES D.J., JANNUZI B.T., JANSSEN M., JETER B., JIANG W., JIMENEZ-ROSALES A., JOHNSON M.D., JORSTAD S., JONES A.C., JOSHI A.V., JUNG T., KARUPPUSAMY R., KAWASHIMA T., KEATING G.K., KETTENIS M., KIM D.-J., KIM J.-Y., KIM J., KIM J., KINO M., KOAY J.Y., KOCHERLAKOTA P., KOFUJI Y., KOYAMA S., KRAMER C., KRAMER J.A., KRAMER M., KRICHBAUM T.P., KUO C.-Y., LA BELLA N., LEE S.-S., LEVIS A., LI Z., LICO R., LINDAHL G., LINDQVIST M., LISAKOV M., LIU J., LIU K., LO W.-P., LOBANOV A.P., LOINARD L., LONSDALE C.J., LOWITZ A.E., LU R.-S., MacDONALD N.R., MAO J., MARKOFF S., MARRONE D.P., MARSCHER A.P., MATSUSHITA S., MEDEIROS L., MENTEN K.M., MIZUNO I., MIZUNO Y., MONTGOMERY J., MORAN J.M., MORIYAMA K., MOSCIBRODZKA M., MULAUDZI W., MULLER C., MULLER H., MUSOKE G., MYSERLIS I., NAGAI H., NAGAR N.M., NAIR D.G., NAKAMURA M., NARAYANAN G., NATARAJAN I., NATHANAIL A., NAVARRO FUENTES S., NEILSEN J., NI C., NOWAK M.A., OH J., OKINO H., OLIVARES SANCHEZ H.R., OYAMA T., OZEL F., PALUMBO D.C.M., PARASCHOS G.F., PARK J., PARSONS H., PATEL N., PEN U.-L., PESCE D.W., PIETU V., POPSTEFANIJA A., PORTH O., PRATHER B., PRINCIPE G., PSALTIS D., PU H.-Y., RAMAKRISHNAN V., RAO R., RAWLINGS M.G., REZZOLLA L., RICARTE A., RIPPERDA B., ROELOFS F., ROMERO-CANIZALES C., ROS E., ROSHANINESHAT A., ROTTMANN H., ROY A.L., RUIZ I., RUSZCZYK C., SANCHEZ S., SANCHEZ-ARGUELLES D., SANCHEZ-PORTAL M., SASADA M., SATAPATHY K., SAURABH, SAVOLAINEN T., SCHLOERB F.P., SCHONFELD J., SCHUSTER K.-F., SHAO L., SHEN Z., SILPA S., SMALL D., WON SOHN B., SOOHOO J., SOSAPANTA SALAS L.D., SOUCCAR K., STANWAY J.S., SUN H., TAZAKI F., TETARENKO A.J., TIEDE P., TILANUS R.P.J., TITUS M., TOMA K., TORNE P., TOSCANO T., TRAIANOU E., TRENT T., TRIPPE S., TURK M., VAN BEMMEL I., VAN LANGEVELDE H.J., VAN ROSSUM D.R., VOS J., WAGNER J., WARD-THOMPSON D., WARDLE J., WASHINGTON J.E., WEINTROUB J., WHARTON R., WIELGUS M., WIIK K., WITZEL G., WONDRAK M.F., WONG G.N., WU Q., YADLAPALLI N., YAMAGUCHI P., YFANTIS A., YOON D., YOUNG A., YOUNSI Z., YU W., YUAN F., YUAN Y.-F., ZENSUS J.A., ZHANG S., ZHAO G.-Y. and ZHAO S.-S.

Abstract (from CDS):

Aims. We investigated the polarization and Faraday properties of Messier 87 (M87) and seven other radio-loud active galactic nuclei (AGNs) at λ0.87 mm (345 GHz) using the Atacama Large Millimeter/submillimeter Array (ALMA). Our goal was to characterize the linear polarization (LP) fractions, measure Faraday rotation measures (RMs), and examine the magnetic field structures in the emission regions of these AGNs.
Methods. We conducted full-polarization observations as part of the ALMA Band 7 very long baseline interferometry (VLBI) commissioning during the April 2021 Event Horizon Telescope (EHT) campaign. We analyzed the LP fractions and RMs to assess the nature of Faraday screens and magnetic fields in the submillimeter emission regions.
Results. We find LP fractions between 1% and 17% and RMs exceeding 105 rad m–2, which are 1-2 orders of magnitude higher than typically observed at longer wavelengths (λ>3 mm). This suggests denser Faraday screens or stronger magnetic fields. Additionally, we present the first submillimeter polarized images of the M87 jet and the observed AGNs, revealing RM gradients and sign reversals in the M87 jet indicative of a kiloparsec-scale helical magnetic field structure.
Conclusions. Our results provide essential constraints for calibrating, analyzing, and interpreting VLBI data from the EHT at 345 GHz, representing a critical step toward submillimeter VLBI imaging.

Abstract Copyright: © The Authors 2025

Journal keyword(s): black hole physics - magnetic fields - polarization - radiation mechanisms: non-thermal - instrumentation: interferometers - instrumentation: polarimeters

Simbad objects: 10

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Number of rows : 10
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 4C 01.28 BLL 10 58 29.60520810 +01 33 58.8237454   18.74 18.28 16.68   ~ 828 2
2 6C 114419+401458 Bla 11 46 58.29791724 +39 58 34.3043988   18.80 18.45 18.58   ~ 261 1
3 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
4 NAME M87 Jet Rad 12 30 49.423 +12 23 28.04           ~ 315 1
5 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
6 QSO J1246-0730 Bla 12 46 04.23211565 -07 30 46.5746985   17.6 18.0 18.2   ~ 198 1
7 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3205 2
8 QSO B1334-127 Bla 13 37 39.78278132 -12 57 24.6933925   18.5 19.00 16.22   ~ 540 1
9 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1409 1
10 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3

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