Redshifted Iron Emission and Absorption Lines in the Chandra X-Ray Spectrum of Centaurus A

被引：1

作者：

Bogensberger, David ^{[1
]}

Miller, Jon ^{[1
]}

Kammoun, Elias ^{[2
,3
,4
]}

Mushotzky, Richard ^{[5
]}

Brenneman, Laura ^{[6
]}

Brandt, W. N. ^{[7
]}

Cackett, Edward M. ^{[8
]}

Fabian, Andrew ^{[11
]}

Kaastra, Jelle ^{[9
,10
]}

Dattathri, Shashank ^{[11
]}

Behar, Ehud ^{[12
]}

Zoghbi, Abderahmen ^{[5
,13
,14
]}

机构：

[1] Univ Michigan, Michigan, ND 48109 USA

[2] Univ Toulouse, Toulouse, France

[3] INAF, Osservatorio Astronomico Brera, Merate, Italy

[4] Roma Tre Univ, Rome, Italy

[5] Univ Maryland, Adelphi, MD USA

[6] Fermilab Astrophys Ctr, Ctr Particle Astrophys, Batavia, IL 60510 USA

[7] Penn State Univ, Bellefonte, PA USA

[8] Wayne State Univ, Detorit, MI USA

[9] SRON Netherlands Inst Space Res, Groningen, Netherlands

[10] Leiden Univ, Leiden, Netherlands

[11] Yale Univ, Yale, CO USA

[12] Technion Israel Inst Technol, Haifa, Israel

[13] NASA, GSFC, Washington, DC USA

[14] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 961卷 / 02期

基金：

以色列科学基金会;

关键词：

ACTIVE GALACTIC NUCLEUS; SUPERMASSIVE BLACK-HOLES; XMM-NEWTON OBSERVATIONS; PHOTON INDEX; ACCRETION; DYNAMICS; GALAXY; RADIO; AGN; CORE;

D O I：

10.3847/1538-4357/ad1107

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Cen A hosts the closest active galactic nucleus to the Milky Way, which makes it an ideal target for investigating the dynamical processes in the vicinity of accreting supermassive black holes. In this paper, we present 14 Chandra HETGS spectra of the nucleus of Cen A that were observed throughout 2022. We compared them with each other, and contrasted them against the two previous Chandra HETGS spectra from 2001. This enabled an investigation into the spectral changes occurring on timescales of months and 21 years. All Chandra spectra could be well fitted by an absorbed power law with a strong and narrow Fe K alpha line, a leaked power-law feature at low energies, and Si and S K alpha lines that could not be associated with the central engine. The flux of the continuum varied by a factor of 2.74 +/- 0.05 over the course of the observations, whereas the Fe line only varied by 18.8% +/- 8.8%. The photon index increased over 21 years, and the hydrogen column density varied significantly within a few months as well. The Fe K alpha line was found at a lower energy than expected from the Cen A redshift, amounting to an excess velocity of 326-94+84kms-1 relative to Cen A. We investigated warped accretion disks, bulk motion, and outflows as possible explanations of this shift. The spectra also featured ionized absorption lines from Fe xxv and Fe xxvi, describing a variable inflow.

引用

页数：14

共 95 条

[1] The Iron Line Profile from Warped Black Hole Accretion Disks [J].

Abarr, Quincy ;

Krawczynski, Henric .

ASTROPHYSICAL JOURNAL, 2021, 906 (01)

[2] The γ-ray spectrum of the core of Centaurus A as observed with HESS and Fermi-LAT [J].

Abdalla, H. ;

Abramowski, A. ;

Aharonian, F. ;

Benkhali, F. Ait ;

Anguner, E. O. ;

Arakawa, M. ;

Armand, C. ;

Arrieta, M. ;

Backes, M. ;

Balzer, A. ;

Barnard, M. ;

Becherini, Y. ;

Tjus, J. Becker ;

Berge, D. ;

Bernhard, S. ;

Bernloehr, K. ;

Blackwell, R. ;

Bottcher, M. ;

Boisson, C. ;

Bolmont, J. ;

Bonnefoy, S. ;

Bordas, P. ;

Bregeon, J. ;

Brun, F. ;

Brun, P. ;

Bryan, M. ;

Buechele, M. ;

Bulik, T. ;

Capasso, M. ;

Caroff, S. ;

Carosi, A. ;

Casanova, S. ;

Cerruti, M. ;

Chakraborty, N. ;

Chaves, R. C. G. ;

Chen, A. ;

Chevalier, J. ;

Colafrancesco, S. ;

Condon, B. ;

Conrad, J. ;

Davids, I. D. ;

Decock, J. ;

Deil, C. ;

Devin, J. ;

deWilt, P. ;

Dirson, L. ;

Djannati-Atai, A. ;

Donath, A. ;

Drury, L. O'C ;

Dyks, J. .

ASTRONOMY & ASTROPHYSICS, 2018, 619

[3] FERMI LARGE AREA TELESCOPE VIEW OF THE CORE OF THE RADIO GALAXY CENTAURUS A [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Atwood, W. B. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Baughman, B. M. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bouvier, A. ;

Brandt, T. J. ;

Bregeon, J. ;

Brez, A. ;

Brigida, M. ;

Bruel, P. ;

Buehler, R. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Cannon, A. ;

Caraveo, P. A. ;

Carrigan, S. ;

Casandjian, J. M. ;

Cavazzuti, E. ;

Cecchi, C. ;

Celik, Oe ;

Charles, E. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Colafrancesco, S. ;

Cominsky, L. R. ;

Conrad, J. ;

Costamante, L. ;

Davis, D. S. ;

Dermer, C. D. ;

de Angelis, A. ;

de Palma, F. ;

do Couto e Silva, E. ;

Drell, P. S. .

ASTROPHYSICAL JOURNAL, 2010, 719 (02) :1433-1444

[4] DISCOVERY OF VERY HIGH ENERGY γ-RAY EMISSION FROM CENTAURUS A WITH HESS [J].

Aharonian, F. ;

Akhperjanian, A. G. ;

Anton, G. ;

de Almeida, U. Barres ;

Bazer-Bachi, A. R. ;

Becherini, Y. ;

Behera, B. ;

Benbow, W. ;

Bernloehr, K. ;

Boisson, C. ;

Bochow, A. ;

Borrel, V. ;

Brion, E. ;

Brucker, J. ;

Brun, P. ;

Buehler, R. ;

Bulik, T. ;

Buesching, I. ;

Boutelier, T. ;

Chadwick, P. M. ;

Charbonnier, A. ;

Chaves, R. C. G. ;

Cheesebrough, A. ;

Chounet, L. -M. ;

Clapson, A. C. ;

Coignet, G. ;

Dalton, M. ;

Daniel, M. K. ;

Davids, I. D. ;

Degrange, B. ;

Deil, C. ;

Dickinson, H. J. ;

Djannati-Atai, A. ;

Domainko, W. ;

Drury, L. O'C. ;

Dubois, F. ;

Dubus, G. ;

Dyks, J. ;

Dyrda, M. ;

Egberts, K. ;

Emmanoulopoulos, D. ;

Espigat, P. ;

Farnier, C. ;

Feinstein, F. ;

Fiasson, A. ;

Foerster, A. ;

Fontaine, G. ;

Fuessling, M. ;

Gabici, S. ;

Gallant, Y. A. .

ASTROPHYSICAL JOURNAL LETTERS, 2009, 695 (01) :L40-L44

[5] Localizing narrow Fe Kα emission within bright AGN [J].

Andonie, Carolina ;

Bauer, Franz E. ;

Carraro, Rosamaria ;

Arevalo, Patricia ;

Alexander, David M. ;

Brandt, William N. ;

Buchner, Johannes ;

He, Adam ;

Koss, Michael J. ;

Ricci, Claudio ;

Salinas, Vicente ;

Solimano, Manuel ;

Tortosa, Alessia ;

Treister, Ezequiel .

ASTRONOMY & ASTROPHYSICS, 2022, 664

[6] UNIFIED MODELS FOR ACTIVE GALACTIC NUCLEI AND QUASARS [J].

ANTONUCCI, R .

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 1993, 31 :473-521

[7]

Arnaud KA, 1996, ASTR SOC P, V101, P17

[8] CENTAURUS-A (NGC-5128) AT 2 KEV-2.3 MEV - HEAO-1 OBSERVATIONS AND IMPLICATIONS [J].

BAITY, WA ;

ROTHSCHILD, RE ;

LINGENFELTER, RE ;

STEIN, WA ;

NOLAN, PL ;

GRUBER, DE ;

KNIGHT, FK ;

MATTESON, JL ;

PETERSON, LE ;

PRIMINI, FA ;

LEVINE, AM ;

LEWIN, WHG ;

MUSHOTZKY, RF ;

TENNANT, AF .

ASTROPHYSICAL JOURNAL, 1981, 244 (02) :429-435

[9] The XSTAR atomic database [J].

Bautista, MA ;

Kallman, TR .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2001, 134 (01) :139-149

[10] The hard X-ray emission of Centaurus A [J].

Beckmann, V. ;

Jean, P. ;

Lubinski, P. ;

Soldi, S. ;

Terrier, R. .

ASTRONOMY & ASTROPHYSICS, 2011, 531

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