2024A&A...692A.205B

Query : 2024A&A...692A.205B

2024A&A...692A.205B - Astronomy and Astrophysics, volume 692A205 (2024/12-1)

The putative center in NGC 1052.

BACZKO A.-K., KADLER M., ROS E., FROMM C.M., WIELGUS M., PERUCHO M., KRICHBAUM T.P., BALOKOVIC M., BLACKBURN L., CHAN C.-K., ISSAOUN S., JANSSEN M., RICCI L., AKIYAMA K., ALBENTOSA-RUIZ E., ALBERDI A., ALEF W., ALGABA J.C., ANANTUA R., ASADA K., AZULAY R., BACH U., BALL D., BANDYOPADHYAY B., BARRETT J., BAUBOCK M., BENSON B.A., BINTLEY D., BLUNDELL R., BOUMAN K.L., BOWER G.C., BOYCE H., BREMER M., BRINKERINK C.D., BRISSENDEN R., BRITZEN S., BRODERICK A.E., BROGUIERE D., BRONZWAER T., BUSTAMANTE S., BYUN D.-Y., CARLSTROM J.E., CECCOBELLO C., CHAEL A., CHANG D.O., CHATTERJEE K., CHATTERJEE S., CHEN M.-T., CHEN Y., CHENG X., CHO I., CHRISTIAN P., CONROY N.S., CONWAY J.E., CORDES J.M., CRAWFORD T.M., CREW G.B., CRUZ-OSORIO A., CUI Y., DAHALE R., DAVELAAR J., DE LAURENTIS M., DEANE R., DEMPSEY J., DESVIGNES G., DEXTER J., DHRUV V., DIHINGIA I.K., DOELEMAN S.S., DOUGALL S.T., 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., FUENTES A., GALISON P., GAMMIE C.F., GARCIA R., GENTAZ O., GEORGIEV B., GODDI C., GOLD R., GOMEZ-RUIZ A.I., GOMEZ J.L., GU M., GURWELL M., HADA K., HAGGARD D., HAWORTH K., HECHT M.H., HESPER R., HEUMANN D., HO L.C., HO P., HONMA M., HUANG C.-W.L., HUANG L., HUGHES D.H., IMPELLIZZERI C.M.V., INOUE M., JAMES D.J., JANNUZI B.T., JETER B., JIANG W., JIMENEZ-ROSALES A., JOHNSON M.D., JORSTAD S., JOSHI A.V., 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., KOCHERLAKOTA P., KOFUJI Y., KOYAMA S., KRAMER C., KRAMER J.A., KRAMER M., KUO C.-Y., LA BELLA N., LAUER T.R., LEE D., LEE S.-S., LEUNG P.K., LEVIS A., LI Z., LICO R., LINDAHL G., LINDQVIST M., LISAKOV M., LIU J., LIU K., LIUZZO E., LO W.-P., LOBANOV A.P., LOINARD L., LONSDALE C.J., LOWITZ A.E., LU R.-S., MacDONALD N.R., MAO J., MARCHILI N., MARKOFF S., MARRONE D.P., MARSCHER A.P., MARTI-VIDAL I., MATSUSHITA S., MATTHEWS L.D., MEDEIROS L., MENTEN K.M., MICHALIK D., MIZUNO I., MIZUNO Y., MORAN J.M., MORIYAMA K., MOSCIBRODZKA M., MULAUDZI W., MULLER C., MULLER H., MUS A., MUSOKE G., MYSERLIS I., NADOLSKI A., NAGAI H., NAGAR N.M., NAIR D.G., NAKAMURA M., NARAYANAN G., NATARAJAN I., NATHANAIL A., NAVARRO FUENTES S., NEILSEN J., NERI R., NI C., NOUTSOS A., NOWAK M.A., OH J., OKINO H., OLIVARES SANCHEZ H.R., ORTIZ-LEON G.N., 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., PLAMBECK R., POPSTEFANIJA A., PORTH O., POTZL F.M., PRATHER B., PRECIADO-LOPEZ J.A., PRINCIPE G., PSALTIS D., PU H.-Y., RAMAKRISHNAN V., RAO R., RAWLINGS M.G., RAYMOND A.W., RICARTE A., RIPPERDA B., ROELOFS F., ROGERS A., ROMERO-CANIZALES C., ROSHANINESHAT A., ROTTMANN H., ROY A.L., RUIZ I., RUSZCZYK C., RYGL K.L.J., SANCHEZ S., SANCHEZ-ARGUELLES D., SANCHEZ-PORTAL M., SASADA M., SATAPATHY K., SAVOLAINEN T., SCHLOERB F.P., SCHONFELD J., SCHUSTER K.-F., SHAO L., SHEN Z., SMALL D., SOHN B.W., 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., 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., WIIK K., WITZEL G., WONDRAK M.F., WONG G.N., WU Q., YADLAPALLI N., YAMAGUCHI P., YFANTIS A., YOON D., YOUNG A., YOUNG K., YOUNSI Z., YU W., YUAN F., YUAN Y.-F., ZENSUS J.A., ZHANG S. and ZHAO G.-Y.

Abstract (from CDS):

Context. Many active galaxies harbor powerful relativistic jets, however, the detailed mechanisms of their formation and acceleration remain poorly understood.
Aims. To investigate the area of jet acceleration and collimation with the highest available angular resolution, we study the innermost region of the bipolar jet in the nearby low-ionization nuclear emission-line region (LINER) galaxy NGC 1052.
Methods. We combined observations of NGC 1052 taken with VLBA, GMVA, and EHT over one week in the spring of 2017. Our study is focused on the size and continuum spectrum of the innermost region containing the central engine and the footpoints of both jets. We employed a synchrotron-self absorption model to fit the continuum radio spectrum and we combined the size measurements from close to the central engine out to ∼1 pc to study the jet collimation.
Results. For the first time, NGC 1052 was detected with the EHT, providing a size of the central region in-between both jet bases of 43 μas perpendicular to the jet axes, corresponding to just around 250 RS (Schwarzschild radii). This size estimate supports previous studies of the jets expansion profile which suggest two breaks of the profile at around 3 × 103 RS and 1 × 104 RS distances to the core. Furthermore, we estimated the magnetic field to be 1.25 Gauss at a distance of 22 μas from the central engine by fitting a synchrotron-self absorption spectrum to the innermost emission feature, which shows a spectral turn-over at ∼130 GHz. Assuming a purely poloidal magnetic field, this implies an upper limit on the magnetic field strength at the event horizon of 2.6 × 104 Gauss, which is consistent with previous measurements.
Conclusions. The complex, low-brightness, double-sided jet structure in NGC 1052 makes it a challenge to detect the source at millimeter (mm) wavelengths. However, our first EHT observations have demonstrated that detection is possible up to at least 230 GHz. This study offers a glimpse through the dense surrounding torus and into the innermost central region, where the jets are formed. This has enabled us to finally resolve this region and provide improved constraints on its expansion and magnetic field strength.

Abstract Copyright: © The Authors 2024

Journal keyword(s): methods: observational - techniques: high angular resolution - techniques: interferometric - galaxies: active - galaxies: jets - galaxies: Seyfert

VizieR on-line data: <Available at CDS (J/A+A/692/A205): tableb.dat list.dat fits/*>

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 NGC 315 LIN 00 57 48.88334410 +30 21 08.8119345 12.80 12.20 11.16 11.26   ~ 869 2
2 4C 06.11 Bla 02 24 28.42818961 +06 59 23.3415566   20.8 20.0 17.78   ~ 172 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 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1841 2
6 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
7 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3205 2
8 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
10 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2

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