Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare

F. Aharonian; G. A. Akhperjanian; U. Barres De Almeida; R. A. Bazer-Bachi; Y. Becherini; B. Behera; W. Benbow; K. Bernlöhr; C. Boisson; A. Bochow; V. Borrel; I. Braun; E. Brion; J. Brucker; P. Brun; R. Bühler; T. Bulik; I. Büsching; T. Boutelier; S. Carrigan; M. P. Chadwick; A. Charbonnier; C. G.R. Chaves; A. Cheesebrough; L. M. Chounet; C. A. Clapson; G. Coignet; M. Dalton; B. Degrange; C. Deil; J. H. Dickinson; A. Djannati-Ataï; W. Domainko; O'C L. Drury; F. Dubois; G. Dubus; J. Dyks; M. Dyrda; K. Egberts; D. Emmanoulopoulos; P. Espigat; C. Farnier; F. Feinstein; A. Fiasson; A. Förster; G. Fontaine; M. Füßling; S. Gabici; A. Y. Gallant; L. Gérard; B. Giebels; F. J. Glicenstein; B. Glück; P. Goret; C. Hadjichristidis; D. Hauser; M. Hauser; S. Heinz; G. Heinzelmann; G. Henri; G. Hermann; A. J. Hinton; A. Hoffmann; W. Hofmann; M. Holleran; S. Hoppe; D. Horns; A. Jacholkowska; C. O. De Jager; I. Jung; K. Katarzyński; S. Kaufmann; E. Kendziorra; M. Kerschhaggl; D. Khangulyan; B. Khélifi; D. Keogh; Nu Komin; K. Kosack; G. Lamanna; J. P. Lenain; T. Lohse; V. Marandon; M. J. Martin; O. Martineau-Huynh; A. Marcowith; D. Maurin; J. L.T. McComb; C. M. Medina; R. Moderski; E. Moulin; M. Naumann-Godo; M. De Naurois; D. Nedbal; D. Nekrassov; J. Niemiec; J. S. Nolan; S. Ohm; J. F. Olive; E. De Oña Wilhelmi; J. Orford; L. Osborne; M. Ostrowski; M. Panter; G. Pedaletti; G. Pelletier; P. O. Petrucci; S. Pita; G. Pühlhofer; M. Punch; A. Quirrenbach; C. B. Raubenheimer; M. Raue; M. S. Rayner; M. Renaud; F. Rieger; J. Ripken; L. Rob; S. Rosier-Lees; G. Rowell; B. Rudak; B. C. Rulten; J. Ruppel; V. Sahakian; A. Santangelo; R. Schlickeiser; M. F. Schöck; R. Schröder; U. Schwanke; S. Schwarzburg; S. Schwemmer; A. Shalchi; L. J. Skilton; H. Sol; D. Spangler; Å Stawarz; R. Steenkamp; C. Stegmann; G. Superina; H. Tam; J. P. Tavernet; R. Terrier; O. Tibolla; C. Van Eldik; G. Vasileiadis; C. Venter; P. J. Vialle; P. Vincent; M. Vivier; J. H. Völk; F. Volpe; J. S. Wagner; M. Ward; A. A. Zdziarski; A. Zech

doi:10.1051/0004-6361:200810912

Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare

F. Aharonian^*, G. A. Akhperjanian, U. Barres De Almeida, R. A. Bazer-Bachi, Y. Becherini, B. Behera, W. Benbow, K. Bernlöhr, C. Boisson, A. Bochow, V. Borrel, I. Braun, E. Brion, J. Brucker, P. Brun, R. Bühler, T. Bulik, I. Büsching, T. Boutelier, S. CarriganM. P. Chadwick, A. Charbonnier, C. G.R. Chaves, A. Cheesebrough, L. M. Chounet, C. A. Clapson, G. Coignet, M. Dalton, B. Degrange, C. Deil, J. H. Dickinson, A. Djannati-Ataï, W. Domainko, O'C L. Drury, F. Dubois, G. Dubus, J. Dyks, M. Dyrda, K. Egberts, D. Emmanoulopoulos, P. Espigat, C. Farnier, F. Feinstein, A. Fiasson, A. Förster, G. Fontaine, M. Füßling, S. Gabici, A. Y. Gallant, L. Gérard, B. Giebels, F. J. Glicenstein, B. Glück, P. Goret, C. Hadjichristidis, D. Hauser, M. Hauser, S. Heinz, G. Heinzelmann, G. Henri, G. Hermann, A. J. Hinton, A. Hoffmann, W. Hofmann, M. Holleran, S. Hoppe, D. Horns, A. Jacholkowska, C. O. De Jager, I. Jung, K. Katarzyński, S. Kaufmann, E. Kendziorra, M. Kerschhaggl, D. Khangulyan, B. Khélifi, D. Keogh, Nu Komin, K. Kosack, G. Lamanna, J. P. Lenain, T. Lohse, V. Marandon, M. J. Martin, O. Martineau-Huynh, A. Marcowith, D. Maurin, J. L.T. McComb, C. M. Medina, R. Moderski, E. Moulin, M. Naumann-Godo, M. De Naurois, D. Nedbal, D. Nekrassov, J. Niemiec, J. S. Nolan, S. Ohm, J. F. Olive, E. De Oña Wilhelmi, J. Orford, L. Osborne, M. Ostrowski, M. Panter, G. Pedaletti, G. Pelletier, P. O. Petrucci, S. Pita, G. Pühlhofer, M. Punch, A. Quirrenbach, C. B. Raubenheimer, M. Raue, M. S. Rayner, M. Renaud, F. Rieger, J. Ripken, L. Rob, S. Rosier-Lees, G. Rowell, B. Rudak, B. C. Rulten, J. Ruppel, V. Sahakian, A. Santangelo, R. Schlickeiser, M. F. Schöck, R. Schröder, U. Schwanke, S. Schwarzburg, S. Schwemmer, A. Shalchi, L. J. Skilton, H. Sol, D. Spangler, Å Stawarz, R. Steenkamp, C. Stegmann, G. Superina, H. Tam, J. P. Tavernet, R. Terrier, O. Tibolla, C. Van Eldik, G. Vasileiadis, C. Venter, P. J. Vialle, P. Vincent, M. Vivier, J. H. Völk, F. Volpe, J. S. Wagner, M. Ward, A. A. Zdziarski, A. Zech

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

The rapidly varying (~10 min timescale) non-thermal X-ray emission observed from Sgr A implies that particle acceleration is occuring close to the event horizon of the supermassive black hole. The TeV γ-ray source HESSJ1745-290 is coincident with Sgr A* and may be closely related to its X-ray emission. Simultaneous X-ray and TeV observations are required to elucidate the relationship between these objects. We report on joint HESS/Chandra observations performed in July 2005, during which an X-ray flare was detected. Despite a factor of ≈9 increase in the X-ray flux of Sgr A*, no evidence is found for an increase in the TeV γ-ray flux from this region. We find that an increase in the γ-ray flux of a factor of 2 or greater can be excluded at a confidence level of 99%. This finding disfavours scenarios in which the keV and TeV emission are associated with the same population of accelerated particles and in which the bulk of the γ-ray emission is produced within ∼ cm (∼100 Rs) of the supermassive black hole.

Original language	English (US)
Pages (from-to)	L25-L28
Journal	Astronomy and Astrophysics
Volume	492
Issue number	1
DOIs	https://doi.org/10.1051/0004-6361:200810912
State	Published - Dec 1 2008
Externally published	Yes

Keywords

Gamma rays: observations
X-rays: individuals: Sgr A

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1051/0004-6361:200810912

Cite this

Aharonian, F., Akhperjanian, G. A., Barres De Almeida, U., Bazer-Bachi, R. A., Becherini, Y., Behera, B., Benbow, W., Bernlöhr, K., Boisson, C., Bochow, A., Borrel, V., Braun, I., Brion, E., Brucker, J., Brun, P., Bühler, R., Bulik, T., Büsching, I., Boutelier, T., ... Zech, A. (2008). Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare. Astronomy and Astrophysics, 492(1), L25-L28. https://doi.org/10.1051/0004-6361:200810912

@article{f5a206f7e14f4fa7b17741acc8db8c4c,

title = "Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare",

abstract = "The rapidly varying (~10 min timescale) non-thermal X-ray emission observed from Sgr A implies that particle acceleration is occuring close to the event horizon of the supermassive black hole. The TeV γ-ray source HESSJ1745-290 is coincident with Sgr A* and may be closely related to its X-ray emission. Simultaneous X-ray and TeV observations are required to elucidate the relationship between these objects. We report on joint HESS/Chandra observations performed in July 2005, during which an X-ray flare was detected. Despite a factor of ≈9 increase in the X-ray flux of Sgr A*, no evidence is found for an increase in the TeV γ-ray flux from this region. We find that an increase in the γ-ray flux of a factor of 2 or greater can be excluded at a confidence level of 99%. This finding disfavours scenarios in which the keV and TeV emission are associated with the same population of accelerated particles and in which the bulk of the γ-ray emission is produced within ∼ cm (∼100 Rs) of the supermassive black hole.",

keywords = "Gamma rays: observations, X-rays: individuals: Sgr A",

author = "F. Aharonian and Akhperjanian, {G. A.} and {Barres De Almeida}, U. and Bazer-Bachi, {R. A.} and Y. Becherini and B. Behera and W. Benbow and K. Bernl{\"o}hr and C. Boisson and A. Bochow and V. Borrel and I. Braun and E. Brion and J. Brucker and P. Brun and R. B{\"u}hler and T. Bulik and I. B{\"u}sching and T. Boutelier and S. Carrigan and Chadwick, {M. P.} and A. Charbonnier and Chaves, {C. G.R.} and A. Cheesebrough and Chounet, {L. M.} and Clapson, {C. A.} and G. Coignet and M. Dalton and B. Degrange and C. Deil and Dickinson, {J. H.} and A. Djannati-Ata{\"i} and W. Domainko and Drury, {O'C L.} and F. Dubois and G. Dubus and J. Dyks and M. Dyrda and K. Egberts and D. Emmanoulopoulos and P. Espigat and C. Farnier and F. Feinstein and A. Fiasson and A. F{\"o}rster and G. Fontaine and M. F{\"u}{\ss}ling and S. Gabici and Gallant, {A. Y.} and L. G{\'e}rard and B. Giebels and Glicenstein, {F. J.} and B. Gl{\"u}ck and P. Goret and C. Hadjichristidis and D. Hauser and M. Hauser and S. Heinz and G. Heinzelmann and G. Henri and G. Hermann and Hinton, {A. J.} and A. Hoffmann and W. Hofmann and M. Holleran and S. Hoppe and D. Horns and A. Jacholkowska and {De Jager}, {C. O.} and I. Jung and K. Katarzy{\'n}ski and S. Kaufmann and E. Kendziorra and M. Kerschhaggl and D. Khangulyan and B. Kh{\'e}lifi and D. Keogh and Nu Komin and K. Kosack and G. Lamanna and Lenain, {J. P.} and T. Lohse and V. Marandon and Martin, {M. J.} and O. Martineau-Huynh and A. Marcowith and D. Maurin and McComb, {J. L.T.} and Medina, {C. M.} and R. Moderski and E. Moulin and M. Naumann-Godo and {De Naurois}, M. and D. Nedbal and D. Nekrassov and J. Niemiec and Nolan, {J. S.} and S. Ohm and Olive, {J. F.} and {De O{\~n}a Wilhelmi}, E. and J. Orford and L. Osborne and M. Ostrowski and M. Panter and G. Pedaletti and G. Pelletier and Petrucci, {P. O.} and S. Pita and G. P{\"u}hlhofer and M. Punch and A. Quirrenbach and Raubenheimer, {C. B.} and M. Raue and Rayner, {M. S.} and M. Renaud and F. Rieger and J. Ripken and L. Rob and S. Rosier-Lees and G. Rowell and B. Rudak and Rulten, {B. C.} and J. Ruppel and V. Sahakian and A. Santangelo and R. Schlickeiser and Sch{\"o}ck, {M. F.} and R. Schr{\"o}der and U. Schwanke and S. Schwarzburg and S. Schwemmer and A. Shalchi and Skilton, {L. J.} and H. Sol and D. Spangler and {\AA} Stawarz and R. Steenkamp and C. Stegmann and G. Superina and H. Tam and Tavernet, {J. P.} and R. Terrier and O. Tibolla and {Van Eldik}, C. and G. Vasileiadis and C. Venter and Vialle, {P. J.} and P. Vincent and M. Vivier and V{\"o}lk, {J. H.} and F. Volpe and Wagner, {J. S.} and M. Ward and Zdziarski, {A. A.} and A. Zech",

year = "2008",

month = dec,

day = "1",

doi = "10.1051/0004-6361:200810912",

language = "English (US)",

volume = "492",

pages = "L25--L28",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "1",

}

Aharonian, F, Akhperjanian, GA, Barres De Almeida, U, Bazer-Bachi, RA, Becherini, Y, Behera, B, Benbow, W, Bernlöhr, K, Boisson, C, Bochow, A, Borrel, V, Braun, I, Brion, E, Brucker, J, Brun, P, Bühler, R, Bulik, T, Büsching, I, Boutelier, T, Carrigan, S, Chadwick, MP, Charbonnier, A, Chaves, CGR, Cheesebrough, A, Chounet, LM, Clapson, CA, Coignet, G, Dalton, M, Degrange, B, Deil, C, Dickinson, JH, Djannati-Ataï, A, Domainko, W, Drury, OCL, Dubois, F, Dubus, G, Dyks, J, Dyrda, M, Egberts, K, Emmanoulopoulos, D, Espigat, P, Farnier, C, Feinstein, F, Fiasson, A, Förster, A, Fontaine, G, Füßling, M, Gabici, S, Gallant, AY, Gérard, L, Giebels, B, Glicenstein, FJ, Glück, B, Goret, P, Hadjichristidis, C, Hauser, D, Hauser, M, Heinz, S, Heinzelmann, G, Henri, G, Hermann, G, Hinton, AJ, Hoffmann, A, Hofmann, W, Holleran, M, Hoppe, S, Horns, D, Jacholkowska, A, De Jager, CO, Jung, I, Katarzyński, K, Kaufmann, S, Kendziorra, E, Kerschhaggl, M, Khangulyan, D, Khélifi, B, Keogh, D, Komin, N, Kosack, K, Lamanna, G, Lenain, JP, Lohse, T, Marandon, V, Martin, MJ, Martineau-Huynh, O, Marcowith, A, Maurin, D, McComb, JLT, Medina, CM, Moderski, R, Moulin, E, Naumann-Godo, M, De Naurois, M, Nedbal, D, Nekrassov, D, Niemiec, J, Nolan, JS, Ohm, S, Olive, JF, De Oña Wilhelmi, E, Orford, J, Osborne, L, Ostrowski, M, Panter, M, Pedaletti, G, Pelletier, G, Petrucci, PO, Pita, S, Pühlhofer, G, Punch, M, Quirrenbach, A, Raubenheimer, CB, Raue, M, Rayner, MS, Renaud, M, Rieger, F, Ripken, J, Rob, L, Rosier-Lees, S, Rowell, G, Rudak, B, Rulten, BC, Ruppel, J, Sahakian, V, Santangelo, A, Schlickeiser, R, Schöck, MF, Schröder, R, Schwanke, U, Schwarzburg, S, Schwemmer, S, Shalchi, A, Skilton, LJ, Sol, H, Spangler, D, Stawarz, Å, Steenkamp, R, Stegmann, C, Superina, G, Tam, H, Tavernet, JP, Terrier, R, Tibolla, O, Van Eldik, C, Vasileiadis, G, Venter, C, Vialle, PJ, Vincent, P, Vivier, M, Völk, JH, Volpe, F, Wagner, JS, Ward, M, Zdziarski, AA & Zech, A 2008, 'Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare', Astronomy and Astrophysics, vol. 492, no. 1, pp. L25-L28. https://doi.org/10.1051/0004-6361:200810912

TY - JOUR

T1 - Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare

AU - Aharonian, F.

AU - Akhperjanian, G. A.

AU - Barres De Almeida, U.

AU - Bazer-Bachi, R. A.

AU - Becherini, Y.

AU - Behera, B.

AU - Benbow, W.

AU - Bernlöhr, K.

AU - Boisson, C.

AU - Bochow, A.

AU - Borrel, V.

AU - Braun, I.

AU - Brion, E.

AU - Brucker, J.

AU - Brun, P.

AU - Bühler, R.

AU - Bulik, T.

AU - Büsching, I.

AU - Boutelier, T.

AU - Carrigan, S.

AU - Chadwick, M. P.

AU - Charbonnier, A.

AU - Chaves, C. G.R.

AU - Cheesebrough, A.

AU - Chounet, L. M.

AU - Clapson, C. A.

AU - Coignet, G.

AU - Dalton, M.

AU - Degrange, B.

AU - Deil, C.

AU - Dickinson, J. H.

AU - Djannati-Ataï, A.

AU - Domainko, W.

AU - Drury, O'C L.

AU - Dubois, F.

AU - Dubus, G.

AU - Dyks, J.

AU - Dyrda, M.

AU - Egberts, K.

AU - Emmanoulopoulos, D.

AU - Espigat, P.

AU - Farnier, C.

AU - Feinstein, F.

AU - Fiasson, A.

AU - Förster, A.

AU - Fontaine, G.

AU - Füßling, M.

AU - Gabici, S.

AU - Gallant, A. Y.

AU - Gérard, L.

AU - Giebels, B.

AU - Glicenstein, F. J.

AU - Glück, B.

AU - Goret, P.

AU - Hadjichristidis, C.

AU - Hauser, D.

AU - Hauser, M.

AU - Heinz, S.

AU - Heinzelmann, G.

AU - Henri, G.

AU - Hermann, G.

AU - Hinton, A. J.

AU - Hoffmann, A.

AU - Hofmann, W.

AU - Holleran, M.

AU - Hoppe, S.

AU - Horns, D.

AU - Jacholkowska, A.

AU - De Jager, C. O.

AU - Jung, I.

AU - Katarzyński, K.

AU - Kaufmann, S.

AU - Kendziorra, E.

AU - Kerschhaggl, M.

AU - Khangulyan, D.

AU - Khélifi, B.

AU - Keogh, D.

AU - Komin, Nu

AU - Kosack, K.

AU - Lamanna, G.

AU - Lenain, J. P.

AU - Lohse, T.

AU - Marandon, V.

AU - Martin, M. J.

AU - Martineau-Huynh, O.

AU - Marcowith, A.

AU - Maurin, D.

AU - McComb, J. L.T.

AU - Medina, C. M.

AU - Moderski, R.

AU - Moulin, E.

AU - Naumann-Godo, M.

AU - De Naurois, M.

AU - Nedbal, D.

AU - Nekrassov, D.

AU - Niemiec, J.

AU - Nolan, J. S.

AU - Ohm, S.

AU - Olive, J. F.

AU - De Oña Wilhelmi, E.

AU - Orford, J.

AU - Osborne, L.

AU - Ostrowski, M.

AU - Panter, M.

AU - Pedaletti, G.

AU - Pelletier, G.

AU - Petrucci, P. O.

AU - Pita, S.

AU - Pühlhofer, G.

AU - Punch, M.

AU - Quirrenbach, A.

AU - Raubenheimer, C. B.

AU - Raue, M.

AU - Rayner, M. S.

AU - Renaud, M.

AU - Rieger, F.

AU - Ripken, J.

AU - Rob, L.

AU - Rosier-Lees, S.

AU - Rowell, G.

AU - Rudak, B.

AU - Rulten, B. C.

AU - Ruppel, J.

AU - Sahakian, V.

AU - Santangelo, A.

AU - Schlickeiser, R.

AU - Schöck, M. F.

AU - Schröder, R.

AU - Schwanke, U.

AU - Schwarzburg, S.

AU - Schwemmer, S.

AU - Shalchi, A.

AU - Skilton, L. J.

AU - Sol, H.

AU - Spangler, D.

AU - Stawarz, Å

AU - Steenkamp, R.

AU - Stegmann, C.

AU - Superina, G.

AU - Tam, H.

AU - Tavernet, J. P.

AU - Terrier, R.

AU - Tibolla, O.

AU - Van Eldik, C.

AU - Vasileiadis, G.

AU - Venter, C.

AU - Vialle, P. J.

AU - Vincent, P.

AU - Vivier, M.

AU - Völk, J. H.

AU - Volpe, F.

AU - Wagner, J. S.

AU - Ward, M.

AU - Zdziarski, A. A.

AU - Zech, A.

PY - 2008/12/1

Y1 - 2008/12/1

N2 - The rapidly varying (~10 min timescale) non-thermal X-ray emission observed from Sgr A implies that particle acceleration is occuring close to the event horizon of the supermassive black hole. The TeV γ-ray source HESSJ1745-290 is coincident with Sgr A* and may be closely related to its X-ray emission. Simultaneous X-ray and TeV observations are required to elucidate the relationship between these objects. We report on joint HESS/Chandra observations performed in July 2005, during which an X-ray flare was detected. Despite a factor of ≈9 increase in the X-ray flux of Sgr A*, no evidence is found for an increase in the TeV γ-ray flux from this region. We find that an increase in the γ-ray flux of a factor of 2 or greater can be excluded at a confidence level of 99%. This finding disfavours scenarios in which the keV and TeV emission are associated with the same population of accelerated particles and in which the bulk of the γ-ray emission is produced within ∼ cm (∼100 Rs) of the supermassive black hole.

AB - The rapidly varying (~10 min timescale) non-thermal X-ray emission observed from Sgr A implies that particle acceleration is occuring close to the event horizon of the supermassive black hole. The TeV γ-ray source HESSJ1745-290 is coincident with Sgr A* and may be closely related to its X-ray emission. Simultaneous X-ray and TeV observations are required to elucidate the relationship between these objects. We report on joint HESS/Chandra observations performed in July 2005, during which an X-ray flare was detected. Despite a factor of ≈9 increase in the X-ray flux of Sgr A*, no evidence is found for an increase in the TeV γ-ray flux from this region. We find that an increase in the γ-ray flux of a factor of 2 or greater can be excluded at a confidence level of 99%. This finding disfavours scenarios in which the keV and TeV emission are associated with the same population of accelerated particles and in which the bulk of the γ-ray emission is produced within ∼ cm (∼100 Rs) of the supermassive black hole.

KW - Gamma rays: observations

KW - X-rays: individuals: Sgr A

UR - http://www.scopus.com/inward/record.url?scp=57249111629&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:200810912

DO - 10.1051/0004-6361:200810912

M3 - Article

AN - SCOPUS:57249111629

SN - 0004-6361

VL - 492

SP - L25-L28

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 1

ER -

Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare

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