THE INNERMOST COLLIMATION STRUCTURE OF THE M87 JET DOWN TO ∼10 SCHWARZSCHILD RADII

被引：128

作者：

Hada, Kazuhiro ^{[1
,2
,3
]}

Kino, Motoki ^{[4
]}

Doi, Akihiro ^{[4
]}

Nagai, Hiroshi ^{[2
]}

Honma, Mareki ^{[2
,3
]}

Hagiwara, Yoshiaki ^{[2
,3
]}

Giroletti, Marcello ^{[1
]}

Giovannini, Gabriele ^{[1
,5
]}

Kawaguchi, Noriyuki ^{[2
,3
]}

机构：

[1] INAF Ist Radioastron, I-40129 Bologna, Italy

[2] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[3] Grad Univ Adv Studies SOKENDAI, Dept Astron Sci, Mitaka, Tokyo 1818588, Japan

[4] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan

[5] Univ Bologna, Dipartimento Fis & Astron, I-40127 Bologna, Italy

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 775卷 / 01期

基金：

日本学术振兴会;

关键词：

galaxies: active; galaxies: individual (M87); galaxies: jets; radio continuum: galaxies; ACTIVE GALACTIC NUCLEI; SUPERMASSIVE BLACK-HOLE; HIGH-FREQUENCY VLBI; GAMMA-RAY EMISSION; RELATIVISTIC JETS; MAGNETIC ACCELERATION; ACCRETION DISKS; GALAXY M87; A-ASTERISK; WINDS;

D O I：

10.1088/0004-637X/775/1/70

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigated the detailed inner jet structure of M87 using Very Long Baseline Array data at 2, 5, 8.4, 15, 23.8, 43, and 86 GHz, especially focusing on the multi-frequency properties of the radio core at the jet base. First, we measured the size of the core region transverse to the jet axis, defined as W-c, at each frequency nu, and found a relation between W-c and nu: W-c(nu) proportional to nu(-0.71 +/- 0.05). Then, by combining W-c(nu) and the frequency dependence of the core position r(c)(nu), which was obtained in our previous study, we constructed a collimation profile of the innermost jet W-c(r) down to similar to 10 Schwarzschild radii (R-s) from the central black hole. We found that W-c(r) smoothly connects with the width profile of the outer edge-brightened, parabolic jet and then follows a similar radial dependence down to several tens of R-s. Closer to the black hole, the measured radial profile suggests a possible change in the jet collimation shape from the outer parabolic one, where the jet shape tends to become more radially oriented. This result could be related to a magnetic collimation process or/and interactions with surrounding materials at the jet base. The present results shed light on the importance of higher-sensitivity/resolution imaging studies of M87 at 86, 43, and 22 GHz; these studies should be examined more rigorously.

引用

页数：7

共 53 条

[1] FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M87 [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Atwood, W. B. ;

Axelsson, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bregeon, J. ;

Brez, A. ;

Brigida, M. ;

Bruel, P. ;

Burnett, T. H. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Cannon, A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cavazzuti, E. ;

Cecchi, C. ;

Celik, Oe ;

Charles, E. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Colafrancesco, S. ;

Conrad, J. ;

Costamante, L. ;

Cutini, S. ;

Davis, D. S. ;

Dermer, C. D. ;

de Angelis, A. ;

de Palma, F. ;

Digel, S. W. ;

Donato, D. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Dubois, R. ;

Dumora, D. ;

Edmonds, Y. .

ASTROPHYSICAL JOURNAL, 2009, 707 (01) :55-60

[2] THE 2010 VERY HIGH ENERGY γ-RAY FLARE AND 10 YEARS OF MULTI-WAVELENGTH OBSERVATIONS OF M 87 [J].

Abramowski, A. ;

Acero, F. ;

Aharonian, F. ;

Akhperjanian, A. G. ;

Anton, G. ;

Balzer, A. ;

Barnacka, A. ;

de Almeida, U. Barres ;

Becherini, Y. ;

Becker, J. ;

Behera, B. ;

Bernloehr, K. ;

Birsin, E. ;

Biteau, J. ;

Bochow, A. ;

Boisson, C. ;

Bolmont, J. ;

Bordas, P. ;

Brucker, J. ;

Brun, F. ;

Brun, P. ;

Bulik, T. ;

Buesching, I. ;

Carrigan, S. ;

Casanova, S. ;

Cerruti, M. ;

Chadwick, P. M. ;

Charbonnier, A. ;

Chaves, R. C. G. ;

Cheesebrough, A. ;

Clapson, A. C. ;

Coignet, G. ;

Cologna, G. ;

Conrad, J. ;

Dalton, M. ;

Daniel, M. K. ;

Davids, I. D. ;

Degrange, B. ;

Deil, C. ;

Dickinson, H. J. ;

Djannati-Atai, A. ;

Domainko, W. ;

Drury, L. O'C. ;

Dubus, G. ;

Dutson, K. ;

Dyks, J. ;

Dyrda, M. ;

Egberts, K. ;

Eger, P. ;

Espigat, P. .

ASTROPHYSICAL JOURNAL, 2012, 746 (02)

[3] Radio Imaging of the Very-High-Energy γ-Ray Emission Region in the Central Engine of a Radio Galaxy [J].

Acciari, V. A. ;

Aliu, E. ;

Arlen, T. ;

Bautista, M. ;

Beilicke, M. ;

Benbow, W. ;

Bradbury, S. M. ;

Buckley, J. H. ;

Bugaev, V. ;

Butt, Y. ;

Byrum, K. ;

Cannon, A. ;

Celik, O. ;

Cesarini, A. ;

Chow, Y. C. ;

Ciupik, L. ;

Cogan, P. ;

Cui, W. ;

Dickherber, R. ;

Fegan, S. J. ;

Finley, J. P. ;

Fortin, P. ;

Fortson, L. ;

Furniss, A. ;

Gall, D. ;

Gillanders, G. H. ;

Grube, J. ;

Guenette, R. ;

Gyuk, G. ;

Hanna, D. ;

Holder, J. ;

Horan, D. ;

Hui, C. M. ;

Humensky, T. B. ;

Imran, A. ;

Kaaret, P. ;

Karlsson, N. ;

Kieda, D. ;

Kildea, J. ;

Konopelko, A. ;

Krawczynski, H. ;

Krennrich, F. ;

Lang, M. J. ;

LeBohec, S. ;

Maier, G. ;

McCann, A. ;

McCutcheon, M. ;

Millis, J. ;

Moriarty, P. ;

Ong, R. A. .

SCIENCE, 2009, 325 (5939) :444-448

[4]

Asada N., 2012, ASTROPHYS J LETT, V745, pL28

[5] Hubble Space Telescope observations of superluminal motion in the M87 jet [J].

Biretta, JA ;

Sparks, WB ;

Macchetto, F .

ASTROPHYSICAL JOURNAL, 1999, 520 (02) :621-626

[6] HYDROMAGNETIC FLOWS FROM ACCRETION DISKS AND THE PRODUCTION OF RADIO JETS [J].

BLANDFORD, RD ;

PAYNE, DG .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1982, 199 (03) :883-903

[7] RELATIVISTIC JETS AS COMPACT RADIO-SOURCES [J].

BLANDFORD, RD ;

KONIGL, A .

ASTROPHYSICAL JOURNAL, 1979, 232 (01) :34-48

[8] IMAGING THE BLACK HOLE SILHOUETTE OF M87: IMPLICATIONS FOR JET FORMATION AND BLACK HOLE SPIN [J].

Broderick, Avery E. ;

Loeb, Abraham .

ASTROPHYSICAL JOURNAL, 2009, 697 (02) :1164-1179

[9] Hydrodynamic collimation of relativistic outflows: Semianalytic solutions and application to gamma-ray bursts [J].

Bromberg, Omer ;

Levinson, Amir .

ASTROPHYSICAL JOURNAL, 2007, 671 (01) :678-688

[10] Superluminal radio features in the M87 jet and the site of flaring TeV gamma-ray emission [J].

Cheung, C. C. ;

Harris, D. E. ;

Stawarz, L. .

ASTROPHYSICAL JOURNAL, 2007, 663 (02) :L65-L68

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