2019ApJ...875L...6E

Query : 2019ApJ...875L...6E

2019ApJ...875L...6E - Astrophys. J., 875, L6-L6 (2019/April-2)

First M87 Event Horizon Telescope results. VI. The shadow and mass of the central black hole.

EVENT HORIZON TELESCOPE COLLABORATION, AKIYAMA K., ALBERDI A., ALEF W., ASADA K., AZULAY R., BACZKO A.-K., BALL D., BALOKOVIC M., BARRETT J., BINTLEY D., BLACKBURN L., BOLAND W., BOUMAN K.L., BOWER G.C., BREMER M., BRINKERINK C.D., BRISSENDEN R., BRITZEN S., BRODERICK A.E., BROGUIERE D., BRONZWAER T., BYUN D.-Y., CARLSTROM J.E., CHAEL A., CHAN C.-K., CHATTERJEE S., CHATTERJEE K., CHEN M.-T., CHEN Y., CHO I., CHRISTIAN P., CONWAY J.E., CORDES J.M., CREW G.B., CUI Y., DAVELAAR J., DE LAURENTIS M., DEANE R., DEMPSEY J., DESVIGNES G., DEXTER J., DOELEMAN S.S., EATOUGH R.P., FALCKE H., FISH V.L., FOMALONT E., FRAGA-ENCINAS R., FRIBERG P., FROMM C.M., GOMEZ J.L., GALISON P., GAMMIE C.F., GARCIA R., GENTAZ O., GEORGIEV B., GODDI C., GOLD R., GU M., GURWELL M., HADA K., HECHT M.H., HESPER R., HO L.C., HO P., HONMA M., HUANG C.-W.L., HUANG L., HUGHES D.H., IKEDA S., INOUE M., ISSAOUN S., JAMES D.J., JANNUZI B.T., JANSSEN M., JETER B., JIANG W., JOHNSON M.D., JORSTAD S., JUNG T., KARAMI M., KARUPPUSAMY R., KAWASHIMA T., KEATING G.K., KETTENIS M., KIM J.-Y., KIM J., KIM J., KINO M., KOAY J.Y., KOCH P.M., KOYAMA S., KRAMER M., KRAMER C., KRICHBAUM T.P., KUO C.-Y., LAUER T.R., LEE S.-S., LI Y.-R., LI Z., LINDQVIST M., LIU K., LIUZZO E., LO W.-P., LOBANOV A.P., LOINARD L., LONSDALE C., LU R.-S., MacDONALD N.R., MAO J., MARKOFF S., MARRONE D.P., MARSCHER A.P., MARTI-VIDAL I., MATSUSHITA S., MATTHEWS L.D., MEDEIROS L., MENTEN K.M., MIZUNO Y., MIZUNO I., MORAN J.M., MORIYAMA K., MOSCIBRODZKA M., MULLER C., NAGAI H., NAGAR N.M., NAKAMURA M., NARAYAN R., NARAYANAN G., NATARAJAN I., NERI R., NI C., NOUTSOS A., OKINO H., OLIVARES H., OYAMA T., OZEL F., PALUMBO D.C.M., PATEL N., PEN U.-L., PESCE D.W., PIETU V., PLAMBECK R., POPSTEFANIJA A., PORTH O., 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., ROS E., ROSE M., ROSHANINESHAT A., ROTTMANN H., ROY A.L., RUSZCZYK C., RYAN B.R., 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., TAZAKI F., TIEDE P., TILANUS R.P.J., TITUS M., TOMA K., TORNE P., TRENT T., TRIPPE S., TSUDA S., VAN BEMMEL I., VAN LANGEVELDE H.J., VAN ROSSUM D.R., WAGNER J., WARDLE J., WEINTROUB J., WEX N., WHARTON R., WIELGUS M., WONG G.N., WU Q., YOUNG A., YOUNG K., YOUNSI Z., YUAN F., YUAN Y.-F., ZENSUS J.A., ZHAO G., ZHAO S.-S., ZHU Z., FARAH J.R., MEYER-ZHAO Z., MICHALIK D., NADOLSKI A., NISHIOKA H., PRADEL N., PRIMIANI R.A., SOUCCAR K., VERTATSCHITSCH L. and YAMAGUCHI P.

Abstract (from CDS):

We present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign. We develop and fit geometric crescent models (asymmetric rings with interior brightness depressions) using two independent sampling algorithms that consider distinct representations of the visibility data. We show that the crescent family of models is statistically preferred over other comparably complex geometric models that we explore. We calibrate the geometric model parameters using general relativistic magnetohydrodynamic (GRMHD) models of the emission region and estimate physical properties of the source. We further fit images generated from GRMHD models directly to the data. We compare the derived emission region and black hole parameters from these analyses with those recovered from reconstructed images. There is a remarkable consistency among all methods and data sets. We find that >50% of the total flux at arcsecond scales comes from near the horizon, and that the emission is dramatically suppressed interior to this region by a factor >10, providing direct evidence of the predicted shadow of a black hole. Across all methods, we measure a crescent diameter of 42 ± 3 µas and constrain its fractional width to be <0.5. Associating the crescent feature with the emission surrounding the black hole shadow, we infer an angular gravitational radius of GM/Dc2 = 3.8 ± 0.4 µas. Folding in a distance measurement of 16.8–0.7+0.8Mpc gives a black hole mass of M=6.5±0.2|stat±0.7|sys×109M☉. This measurement from lensed emission near the event horizon is consistent with the presence of a central Kerr black hole, as predicted by the general theory of relativity.

Abstract Copyright: © 2019. The American Astronomical Society.

Journal keyword(s): black hole physics - galaxies: individual: M87 - gravitation - techniques: high angular resolution - techniques: interferometric

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 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6642 0
2 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7190 3
3 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4388 3

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