2021ApJ...910L..14G

Query : 2021ApJ...910L..14G

2021ApJ...910L..14G - Astrophys. J., 910, L14-L14 (2021/March-3)

Polarimetric properties of Event Horizon Telescope targets from ALMA.

GODDI C., MARTI-VIDAL I., MESSIAS H., BOWER G.C., BRODERICK A.E., DEXTER J., MARRONE D.P., MOSCIBRODZKA M., NAGAI H., ALGABA J.C., ASADA K., CREW G.B., GOMEZ J.L., IMPELLIZZERI C.M.V., JANSSEN M., KADLER M., KRICHBAUM T.P., LICO R., MATTHEWS L.D., NATHANAIL A., RICARTE A., ROS E., YOUNSI Z., AKIYAMA K., ALBERDI A., ALEF W., ANANTUA R., AZULAY R., BACZKO A.-K., BALL D., BALOKOVIC M., BARRETT J., BENSON B.A., BINTLEY D., BLACKBURN L., BLUNDELL R., BOLAND W., BOUMAN K.L., BOYCE H., BREMER M., BRINKERINK C.D., BRISSENDEN R., BRITZEN S., BROGUIERE D., BRONZWAER T., BYUN D.-Y., CARLSTROM J.E., CHAEL A., CHAN C.-K., CHATTERJEE S., CHATTERJEE K., CHEN M.-T., CHEN Y., CHESLER P.M., CHO I., CHRISTIAN P., CONWAY J.E., CORDES J.M., CRAWFORD T.M., CRUZ-OSORIO A., CUI Y., DAVELAAR J., DE LAURENTIS M., DEANE R., DEMPSEY J., DESVIGNES G., DOELEMAN S.S., EATOUGH R.P., FALCKE H., FARAH J., FISH V.L., FOMALONT E., FORD H.A., 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., GU M., GURWELL M., HADA K., HAGGARD D., HECHT M.H., HESPER R., HO L.C., HO P., HONMA M., HUANG C.-W.L., HUANG L., HUGHES D.H., INOUE M., ISSAOUN S., JAMES D.J., JANNUZI B.T., JETER B., JIANG W., JIMENEZ-ROSALES A., JOHNSON M.D., JORSTAD S., JUNG T., KARAMI M., KARUPPUSAMY R., KAWASHIMA T., KEATING G.K., KETTENIS M., KIM D.-J., KIM J.-Y., KIM J., KIM J., KINO M., KOAY J.Y., KOFUJI Y., KOCH P.M., KOYAMA S., KRAMER M., KRAMER C., KUO C.-Y., LAUER T.R., LEE S.-S., LEVIS A., LI Y.-R., LI Z., LINDQVIST M., LINDAHL G., LIU J., LIU K., LIUZZO E., LO W.-P., LOBANOV A.P., LOINARD L., LONSDALE C., LU R.-S., MacDONALD N.R., MAO J., MARCHILI N., MARKOFF S., MARSCHER A.P., MATSUSHITA S., MEDEIROS L., MENTEN K.M., MIZUNO I., MIZUNO Y., MORAN J.M., MORIYAMA K., MULLER C., MUSOKE G., MUS MEJIAS A., NAGAR N.M., NAKAMURA M., NARAYAN R., NARAYANAN G., NATARAJAN I., NEILSEN J., NERI R., NI C., NOUTSOS A., NOWAK M.A., OKINO H., OLIVARES H., ORTIZ-LEON G.N., OYAMA T., OZEL F., PALUMBO D.C.M., PARK J., PATEL N., PEN U.-L., PESCE D.W., PIETU V., PLAMBECK R., POPSTEFANIJA A., PORTH O., POTZL F.M., PRATHER B., PRECIADO-LOPEZ J.A., PSALTIS D., PU H.-Y., RAMAKRISHNAN V., RAO R., RAWLINGS M.G., RAYMOND A.W., REZZOLLA L., RIPPERDA B., ROELOFS F., ROGERS A., ROSE M., ROSHANINESHAT A., ROTTMANN H., ROY A.L., RUSZCZYK C., RYGL K.L.J., SANCHEZ S., SANCHEZ-ARGUELLES D., SASADA M., SAVOLAINEN T., SCHLOERB F.P., SCHUSTER K.-F., SHAO L., SHEN Z., SMALL D., SOHN B.W., SOOHOO J., SUN H., TAZAKI F., TETARENKO A.J., TIEDE P., TILANUS R.P.J., TITUS M., TOMA K., TORNE P., TRENT T., TRAIANOU E., TRIPPE S., VAN BEMMEL I., VAN LANGEVELDE H.J., VAN ROSSUM D.R., WAGNER J., WARD-THOMPSON D., WARDLE J., WEINTROUB J., WEX N., WHARTON R., WIELGUS M., WONG G.N., WU Q., YOON D., YOUNG A., YOUNG K., YUAN F., YUAN Y.-F., ZENSUS J.A., ZHAO G.-Y., ZHAO S.-S., BRUNI G., GOPAKUMAR A., HERNANDEZ-GOMEZ A., HERRERO-ILLANA R., INGRAM A., KOMOSSA S., KOVALEV Y.Y., MUDERS D., PERUCHO M., ROSCH F. and VALTONEN M.

Abstract (from CDS):

We present the results from a full polarization study carried out with the Atacama Large Millimeter/submillimeter Array (ALMA) during the first Very Long Baseline Interferometry (VLBI) campaign, which was conducted in 2017 April in the λ3 mm and λ1.3 mm bands, in concert with the Global mm-VLBI Array (GMVA) and the Event Horizon Telescope (EHT), respectively. We determine the polarization and Faraday properties of all VLBI targets, including Sgr A*, M87, and a dozen radio-loud active galactic nuclei (AGNs), in the two bands at several epochs in a time window of 10 days. We detect high linear polarization fractions (2%-15%) and large rotation measures (RM > 103.3-105.5 rad m–2), confirming the trends of previous AGN studies at millimeter wavelengths. We find that blazars are more strongly polarized than other AGNs in the sample, while exhibiting (on average) order-of-magnitude lower RM values, consistent with the AGN viewing angle unification scheme. For Sgr A* we report a mean RM of (-4.2 ± 0.3) x 105 rad m–2 at 1.3 mm, consistent with measurements over the past decade and, for the first time, an RM of (-2.1 ± 0.1) x 105 rad m–2 at 3 mm, suggesting that about half of the Faraday rotation at 1.3 mm may occur between the 3 mm photosphere and the 1.3 mm source. We also report the first unambiguous measurement of RM toward the M87 nucleus at millimeter wavelengths, which undergoes significant changes in magnitude and sign reversals on a one year timescale, spanning the range from -1.2 to 0.3 x 105 rad m–2 at 3 mm and -4.1 to 1.5 x 105 rad m–2 at 1.3 mm. Given this time variability, we argue that, unlike the case of Sgr A*, the RM in M87 does not provide an accurate estimate of the mass accretion rate onto the black hole. We put forward a two-component model, comprised of a variable compact region and a static extended region, that can simultaneously explain the polarimetric properties observed by both the EHT (on horizon scales) and ALMA (which observes the combined emission from both components). These measurements provide critical constraints for the calibration, analysis, and interpretation of simultaneously obtained VLBI data with the EHT and GMVA.

Abstract Copyright: © 2021. The American Astronomical Society

Journal keyword(s): Magnetic fields - Relativistic jets - Active galactic nuclei - Radio jets - Polarimetry - Interferometry - Long baseline interferometry - Galactic center - Supermassive black holes - Blazars - Radio galaxies - Quasars

Simbad objects: 23

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Number of rows : 23
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 QSO B0003-066 BLL 00 06 13.89288482 -06 23 35.3353584   19.1 18.50 17.14   ~ 346 1
2 QSO B0130-17 Bla 01 32 43.48746292 -16 54 48.5220804   18.75 18.44 15.44   ~ 247 1
3 NGC 1052 Bla 02 41 04.79849989 -08 15 20.7519527 11.84 11.41 10.47 10.71   ~ 1397 2
4 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
5 QSO B0507+179 Bla 05 10 02.36912937 +18 00 41.5815635   20.0 19.0 19.09   ~ 470 1
6 PG 0851+202 BLL 08 54 48.8749846272 +20 06 30.639583620   15.649 15.146 15.446   ~ 2513 1
7 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
8 4C 01.28 BLL 10 58 29.60520810 +01 33 58.8237454   18.74 18.28 16.68   ~ 828 2
9 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1841 2
10 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
11 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
12 NAME Knot in M87 Jet PoG 12 30 49.355 +12 23 28.32           ~ 233 0
13 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
14 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3205 2
15 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
16 QSO B1730-130 Bla 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1198 1
17 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
18 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
19 PSR J1745-2900 Psr 17 45 40.1640 -29 00 29.818           ~ 358 0
20 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 1007 1
21 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 724 1
22 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 918 1
23 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2

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