New constraints on the mid-IR EBL from the HESS discovery of VHE γ-rays from 1ES 0229+200

F. Aharonian; A. G. Akhperjanian; U. De Barres Almeida; A. R. Bazer-Bachi; B. Behera; M. Beilicke; W. Benbow; K. Bernlöhr; C. Boisson; O. Bolz; V. Borrel; I. Braun; E. Brion; A. M. Brown; R. Bühler; T. Bulik; I. Büsching; T. Boutelier; S. Carrigan; P. M. Chadwick; L. M. Chounet; A. C. Clapson; G. Coignet; R. Cornils; L. Costamante; M. Dalton; B. Degrange; H. J. Dickinson; A. Djannati-Ataï; W. Domainko; L. O'C Drury; F. Dubois; G. Dubus; J. Dyks; K. Egberts; D. Emmanoulopoulos; P. Espigat; C. Farnier; F. Feinstein; A. Fiasson; A. Förster; G. Fontaine; Seb Funk; M. Füßling; Y. A. Gallant; B. Giebels; J. F. Glicenstein; B. Glück; P. Goret; C. Hadjichristidis; D. Hauser; M. Hauser; G. Heinzelmann; G. Henri; G. Hermann; J. A. Hinton; A. Hoffmann; W. Hofmann; M. Holleran; S. Hoppe; D. Horns; A. Jacholkowska; O. C. De Jager; I. Jung; K. Katarzyński; E. Kendziorra; M. Kerschhaggl; B. Khelifi; D. Keogh; Nu Komin; K. Kosack; G. Lamanna; I. J. Latham; A. Lemière; M. Lemoine-Goumard; J. P. Lenain; T. Lohse; J. M. Martin; O. Martineau-Huynh; A. Marcowith; C. Masterson; D. Maurin; G. Maurin; T. J L McComb; R. Moderski; E. Moulin; M. De Naurois; D. Nedbal; S. J. Nolan; S. Ohm; J. P. Olive; E. De Oña Wilhelmi; K. J. Orford; J. L. Osborne; M. Ostrowski; M. Panter; G. Pedaletti; G. Pelletier; P. O. Petrucci; S. Pita; G. Pühlhofer; M. Punch; S. Ranchón; B. C. Raubenheimer; M. Raue; S. M. Rayner; M. Renaud; J. Ripken; L. Rob; L. Rolland; S. Rosier-Lees; G. Rowell; B. Rudak; J. Ruppel; V. Sahakian; A. Santangelo; R. Schlickeiser; F. Schöck; R. Schröder; U. Schwanke; S. Schwarzburg; S. Schwemmer; A. Shalchi; H. Sol; D. Spangler; Stawarz; R. Steenkamp; C. Stegmann; G. Superina; P. H. Tam; J. P. Tavernet; R. Terrier; C. Van Eldik; G. Vasileiadis; C. Venter; J. P. Vialle; P. Vincent; M. Vivier; H. J. Volk; F. Volpe; S. J. Wagner; M. Ward; A. A. Zdziarski; A. Zech

doi:10.1051/0004-6361:20078462

New constraints on the mid-IR EBL from the HESS discovery of VHE γ-rays from 1ES 0229+200

F. Aharonian, A. G. Akhperjanian, U. De Barres Almeida, A. R. Bazer-Bachi, B. Behera, M. Beilicke, W. Benbow, K. Bernlöhr, C. Boisson, O. Bolz, V. Borrel, I. Braun, E. Brion, A. M. Brown, R. Bühler, T. Bulik, I. Büsching, T. Boutelier, S. Carrigan, P. M. ChadwickL. M. Chounet, A. C. Clapson, G. Coignet, R. Cornils, L. Costamante, M. Dalton, B. Degrange, H. J. Dickinson, A. Djannati-Ataï, W. Domainko, L. O'C Drury, F. Dubois, G. Dubus, J. Dyks, K. Egberts, D. Emmanoulopoulos, P. Espigat, C. Farnier, F. Feinstein, A. Fiasson, A. Förster, G. Fontaine, Seb Funk, M. Füßling, Y. A. Gallant, B. Giebels, J. F. Glicenstein, B. Glück, P. Goret, C. Hadjichristidis, D. Hauser, M. Hauser, G. Heinzelmann, G. Henri, G. Hermann, J. A. Hinton, A. Hoffmann, W. Hofmann, M. Holleran, S. Hoppe, D. Horns, A. Jacholkowska, O. C. De Jager, I. Jung, K. Katarzyński, E. Kendziorra, M. Kerschhaggl, B. Khelifi, D. Keogh, Nu Komin, K. Kosack, G. Lamanna, I. J. Latham, A. Lemière, M. Lemoine-Goumard, J. P. Lenain, T. Lohse, J. M. Martin, O. Martineau-Huynh, A. Marcowith, C. Masterson, D. Maurin, G. Maurin, T. J L McComb, R. Moderski, E. Moulin, M. De Naurois, D. Nedbal, S. J. Nolan, S. Ohm, J. P. Olive, E. De Oña Wilhelmi, K. J. Orford, J. L. Osborne, M. Ostrowski, M. Panter, G. Pedaletti, G. Pelletier, P. O. Petrucci, S. Pita, G. Pühlhofer, M. Punch, S. Ranchón, B. C. Raubenheimer, M. Raue, S. M. Rayner, M. Renaud, J. Ripken, L. Rob, L. Rolland, S. Rosier-Lees, G. Rowell, B. Rudak, J. Ruppel, V. Sahakian, A. Santangelo, R. Schlickeiser, F. Schöck, R. Schröder, U. Schwanke, S. Schwarzburg, S. Schwemmer, A. Shalchi, H. Sol, D. Spangler, Stawarz, R. Steenkamp, C. Stegmann, G. Superina, P. H. Tam, J. P. Tavernet, R. Terrier, C. Van Eldik, G. Vasileiadis, C. Venter, J. P. Vialle, P. Vincent, M. Vivier, H. J. Volk, F. Volpe, S. J. Wagner, M. Ward, A. A. Zdziarski, A. Zech

Physics and Astronomy (Twin Cities)

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

225 Scopus citations

Abstract

Aims. To investigate the very high energy (VHE: > 100 GeV) y-ray emission from the high-frequency peaked BL Lac IES 0229+200. Methods. Observations of IES 0229+200 at energies above 580 GeV were performed with the High Energy Stereoscopic System (HESS) in 2005 and 2006. Results. IES 0229+200 is discovered by HESS to be an emitter of VHE photons. A signal is detected at the 6.6σ level in the HESS observations (41.8 h live time). The integral flux above 580 GeV is (9.4 ± 1.5 _stat ± 1.9 _syst) × 10 ^-13 cm ^-2 s ^-1 corresponding to ∼1.8% of the flux observed from the Crab Nebula. The data show no evidence for significant variability on any time scale. The observed spectrum is characterized by a hard power law (T = 2.50 ± 0.19 _stat ± 0.10 _syst) from 500 GeV to ∼15 TeV. Conclusions. The high-energy range and hardness of the observed spectrum, coupled with the object's relatively large redshift (z = 0.1396), enable the strongest constraints so far on the density of the Extragalactic Background Light (EBL) in the mid-infrared band. Assuming that the emitted spectrum is not harder than T _mt ≈ 1.5, the HESS data support an EBL spectrum σλ ^-1 and density close to the lower limit from source counts measured by Spitzer, confirming the previous indications from the HEGRA data of IES 1426+428 (z = 0.129). Irrespective of the EBL models used, the intrinsic spectrum of IES 0229+200 is hard, thus locating the high-energy peak of its spectral energy distribution above a few TeV.

Original language	English (US)
Pages (from-to)	L9-L13
Journal	Astronomy and Astrophysics
Volume	475
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20078462
State	Published - Nov 2007

Keywords

BL lacertae objects: individual: IES 0229+200
Galaxies
Gamma rays: observations

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Aharonian, F., Akhperjanian, A. G., De Barres Almeida, U., Bazer-Bachi, A. R., Behera, B., Beilicke, M., Benbow, W., Bernlöhr, K., Boisson, C., Bolz, O., Borrel, V., Braun, I., Brion, E., Brown, A. M., Bühler, R., Bulik, T., Büsching, I., Boutelier, T., Carrigan, S., ... Zech, A. (2007). New constraints on the mid-IR EBL from the HESS discovery of VHE γ-rays from 1ES 0229+200. Astronomy and Astrophysics, 475(2), L9-L13. https://doi.org/10.1051/0004-6361:20078462

Aharonian, F, Akhperjanian, AG, De Barres Almeida, U, Bazer-Bachi, AR, Behera, B, Beilicke, M, Benbow, W, Bernlöhr, K, Boisson, C, Bolz, O, Borrel, V, Braun, I, Brion, E, Brown, AM, Bühler, R, Bulik, T, Büsching, I, Boutelier, T, Carrigan, S, Chadwick, PM, Chounet, LM, Clapson, AC, Coignet, G, Cornils, R, Costamante, L, Dalton, M, Degrange, B, Dickinson, HJ, Djannati-Ataï, A, Domainko, W, O'C Drury, L, Dubois, F, Dubus, G, Dyks, J, Egberts, K, Emmanoulopoulos, D, Espigat, P, Farnier, C, Feinstein, F, Fiasson, A, Förster, A, Fontaine, G, Funk, S, Füßling, M, Gallant, YA, Giebels, B, Glicenstein, JF, Glück, B, Goret, P, Hadjichristidis, C, Hauser, D, Hauser, M, Heinzelmann, G, Henri, G, Hermann, G, Hinton, JA, Hoffmann, A, Hofmann, W, Holleran, M, Hoppe, S, Horns, D, Jacholkowska, A, De Jager, OC, Jung, I, Katarzyński, K, Kendziorra, E, Kerschhaggl, M, Khelifi, B, Keogh, D, Komin, N, Kosack, K, Lamanna, G, Latham, IJ, Lemière, A, Lemoine-Goumard, M, Lenain, JP, Lohse, T, Martin, JM, Martineau-Huynh, O, Marcowith, A, Masterson, C, Maurin, D, Maurin, G, McComb, TJL, Moderski, R, Moulin, E, De Naurois, M, Nedbal, D, Nolan, SJ, Ohm, S, Olive, JP, De Oña Wilhelmi, E, Orford, KJ, Osborne, JL, Ostrowski, M, Panter, M, Pedaletti, G, Pelletier, G, Petrucci, PO, Pita, S, Pühlhofer, G, Punch, M, Ranchón, S, Raubenheimer, BC, Raue, M, Rayner, SM, Renaud, M, Ripken, J, Rob, L, Rolland, L, Rosier-Lees, S, Rowell, G, Rudak, B, Ruppel, J, Sahakian, V, Santangelo, A, Schlickeiser, R, Schöck, F, Schröder, R, Schwanke, U, Schwarzburg, S, Schwemmer, S, Shalchi, A, Sol, H, Spangler, D, Stawarz, Steenkamp, R, Stegmann, C, Superina, G, Tam, PH, Tavernet, JP, Terrier, R, Van Eldik, C, Vasileiadis, G, Venter, C, Vialle, JP, Vincent, P, Vivier, M, Volk, HJ, Volpe, F, Wagner, SJ, Ward, M, Zdziarski, AA & Zech, A 2007, 'New constraints on the mid-IR EBL from the HESS discovery of VHE γ-rays from 1ES 0229+200', Astronomy and Astrophysics, vol. 475, no. 2, pp. L9-L13. https://doi.org/10.1051/0004-6361:20078462

@article{be4b343040144fbc95115766c44a5f4e,

title = "New constraints on the mid-IR EBL from the HESS discovery of VHE γ-rays from 1ES 0229+200",

abstract = "Aims. To investigate the very high energy (VHE: > 100 GeV) y-ray emission from the high-frequency peaked BL Lac IES 0229+200. Methods. Observations of IES 0229+200 at energies above 580 GeV were performed with the High Energy Stereoscopic System (HESS) in 2005 and 2006. Results. IES 0229+200 is discovered by HESS to be an emitter of VHE photons. A signal is detected at the 6.6σ level in the HESS observations (41.8 h live time). The integral flux above 580 GeV is (9.4 ± 1.5 stat ± 1.9 syst) × 10 -13 cm -2 s -1 corresponding to ∼1.8% of the flux observed from the Crab Nebula. The data show no evidence for significant variability on any time scale. The observed spectrum is characterized by a hard power law (T = 2.50 ± 0.19 stat ± 0.10 syst) from 500 GeV to ∼15 TeV. Conclusions. The high-energy range and hardness of the observed spectrum, coupled with the object's relatively large redshift (z = 0.1396), enable the strongest constraints so far on the density of the Extragalactic Background Light (EBL) in the mid-infrared band. Assuming that the emitted spectrum is not harder than T mt ≈ 1.5, the HESS data support an EBL spectrum σλ -1 and density close to the lower limit from source counts measured by Spitzer, confirming the previous indications from the HEGRA data of IES 1426+428 (z = 0.129). Irrespective of the EBL models used, the intrinsic spectrum of IES 0229+200 is hard, thus locating the high-energy peak of its spectral energy distribution above a few TeV.",

keywords = "BL lacertae objects: individual: IES 0229+200, Galaxies, Gamma rays: observations",

author = "F. Aharonian and Akhperjanian, {A. G.} and {De Barres Almeida}, U. and Bazer-Bachi, {A. R.} and B. Behera and M. Beilicke and W. Benbow and K. Bernl{\"o}hr and C. Boisson and O. Bolz and V. Borrel and I. Braun and E. Brion and Brown, {A. M.} and R. B{\"u}hler and T. Bulik and I. B{\"u}sching and T. Boutelier and S. Carrigan and Chadwick, {P. M.} and Chounet, {L. M.} and Clapson, {A. C.} and G. Coignet and R. Cornils and L. Costamante and M. Dalton and B. Degrange and Dickinson, {H. J.} and A. Djannati-Ata{\"i} and W. Domainko and {O'C Drury}, L. and F. Dubois and G. Dubus and J. Dyks 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 Seb Funk and M. F{\"u}{\ss}ling and Gallant, {Y. A.} and B. Giebels and Glicenstein, {J. F.} and B. Gl{\"u}ck and P. Goret and C. Hadjichristidis and D. Hauser and M. Hauser and G. Heinzelmann and G. Henri and G. Hermann and Hinton, {J. A.} and A. Hoffmann and W. Hofmann and M. Holleran and S. Hoppe and D. Horns and A. Jacholkowska and {De Jager}, {O. C.} and I. Jung and K. Katarzy{\'n}ski and E. Kendziorra and M. Kerschhaggl and B. Khelifi and D. Keogh and Nu Komin and K. Kosack and G. Lamanna and Latham, {I. J.} and A. Lemi{\`e}re and M. Lemoine-Goumard and Lenain, {J. P.} and T. Lohse and Martin, {J. M.} and O. Martineau-Huynh and A. Marcowith and C. Masterson and D. Maurin and G. Maurin and McComb, {T. J L} and R. Moderski and E. Moulin and {De Naurois}, M. and D. Nedbal and Nolan, {S. J.} and S. Ohm and Olive, {J. P.} and {De O{\~n}a Wilhelmi}, E. and Orford, {K. J.} and Osborne, {J. L.} 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 S. Ranch{\'o}n and Raubenheimer, {B. C.} and M. Raue and Rayner, {S. M.} and M. Renaud and J. Ripken and L. Rob and L. Rolland and S. Rosier-Lees and G. Rowell and B. Rudak and J. Ruppel and V. Sahakian and A. Santangelo and R. Schlickeiser and F. Sch{\"o}ck and R. Schr{\"o}der and U. Schwanke and S. Schwarzburg and S. Schwemmer and A. Shalchi and H. Sol and D. Spangler and Stawarz and R. Steenkamp and C. Stegmann and G. Superina and Tam, {P. H.} and Tavernet, {J. P.} and R. Terrier and {Van Eldik}, C. and G. Vasileiadis and C. Venter and Vialle, {J. P.} and P. Vincent and M. Vivier and Volk, {H. J.} and F. Volpe and Wagner, {S. J.} and M. Ward and Zdziarski, {A. A.} and A. Zech",

year = "2007",

month = nov,

doi = "10.1051/0004-6361:20078462",

language = "English (US)",

volume = "475",

pages = "L9--L13",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "2",

}

TY - JOUR

T1 - New constraints on the mid-IR EBL from the HESS discovery of VHE γ-rays from 1ES 0229+200

AU - Aharonian, F.

AU - Akhperjanian, A. G.

AU - De Barres Almeida, U.

AU - Bazer-Bachi, A. R.

AU - Behera, B.

AU - Beilicke, M.

AU - Benbow, W.

AU - Bernlöhr, K.

AU - Boisson, C.

AU - Bolz, O.

AU - Borrel, V.

AU - Braun, I.

AU - Brion, E.

AU - Brown, A. M.

AU - Bühler, R.

AU - Bulik, T.

AU - Büsching, I.

AU - Boutelier, T.

AU - Carrigan, S.

AU - Chadwick, P. M.

AU - Chounet, L. M.

AU - Clapson, A. C.

AU - Coignet, G.

AU - Cornils, R.

AU - Costamante, L.

AU - Dalton, M.

AU - Degrange, B.

AU - Dickinson, H. J.

AU - Djannati-Ataï, A.

AU - Domainko, W.

AU - O'C Drury, L.

AU - Dubois, F.

AU - Dubus, G.

AU - Dyks, J.

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 - Funk, Seb

AU - Füßling, M.

AU - Gallant, Y. A.

AU - Giebels, B.

AU - Glicenstein, J. F.

AU - Glück, B.

AU - Goret, P.

AU - Hadjichristidis, C.

AU - Hauser, D.

AU - Hauser, M.

AU - Heinzelmann, G.

AU - Henri, G.

AU - Hermann, G.

AU - Hinton, J. A.

AU - Hoffmann, A.

AU - Hofmann, W.

AU - Holleran, M.

AU - Hoppe, S.

AU - Horns, D.

AU - Jacholkowska, A.

AU - De Jager, O. C.

AU - Jung, I.

AU - Katarzyński, K.

AU - Kendziorra, E.

AU - Kerschhaggl, M.

AU - Khelifi, B.

AU - Keogh, D.

AU - Komin, Nu

AU - Kosack, K.

AU - Lamanna, G.

AU - Latham, I. J.

AU - Lemière, A.

AU - Lemoine-Goumard, M.

AU - Lenain, J. P.

AU - Lohse, T.

AU - Martin, J. M.

AU - Martineau-Huynh, O.

AU - Marcowith, A.

AU - Masterson, C.

AU - Maurin, D.

AU - Maurin, G.

AU - McComb, T. J L

AU - Moderski, R.

AU - Moulin, E.

AU - De Naurois, M.

AU - Nedbal, D.

AU - Nolan, S. J.

AU - Ohm, S.

AU - Olive, J. P.

AU - De Oña Wilhelmi, E.

AU - Orford, K. J.

AU - Osborne, J. 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 - Ranchón, S.

AU - Raubenheimer, B. C.

AU - Raue, M.

AU - Rayner, S. M.

AU - Renaud, M.

AU - Ripken, J.

AU - Rob, L.

AU - Rolland, L.

AU - Rosier-Lees, S.

AU - Rowell, G.

AU - Rudak, B.

AU - Ruppel, J.

AU - Sahakian, V.

AU - Santangelo, A.

AU - Schlickeiser, R.

AU - Schöck, F.

AU - Schröder, R.

AU - Schwanke, U.

AU - Schwarzburg, S.

AU - Schwemmer, S.

AU - Shalchi, A.

AU - Sol, H.

AU - Spangler, D.

AU - Stawarz,

AU - Steenkamp, R.

AU - Stegmann, C.

AU - Superina, G.

AU - Tam, P. H.

AU - Tavernet, J. P.

AU - Terrier, R.

AU - Van Eldik, C.

AU - Vasileiadis, G.

AU - Venter, C.

AU - Vialle, J. P.

AU - Vincent, P.

AU - Vivier, M.

AU - Volk, H. J.

AU - Volpe, F.

AU - Wagner, S. J.

AU - Ward, M.

AU - Zdziarski, A. A.

AU - Zech, A.

PY - 2007/11

Y1 - 2007/11

N2 - Aims. To investigate the very high energy (VHE: > 100 GeV) y-ray emission from the high-frequency peaked BL Lac IES 0229+200. Methods. Observations of IES 0229+200 at energies above 580 GeV were performed with the High Energy Stereoscopic System (HESS) in 2005 and 2006. Results. IES 0229+200 is discovered by HESS to be an emitter of VHE photons. A signal is detected at the 6.6σ level in the HESS observations (41.8 h live time). The integral flux above 580 GeV is (9.4 ± 1.5 stat ± 1.9 syst) × 10 -13 cm -2 s -1 corresponding to ∼1.8% of the flux observed from the Crab Nebula. The data show no evidence for significant variability on any time scale. The observed spectrum is characterized by a hard power law (T = 2.50 ± 0.19 stat ± 0.10 syst) from 500 GeV to ∼15 TeV. Conclusions. The high-energy range and hardness of the observed spectrum, coupled with the object's relatively large redshift (z = 0.1396), enable the strongest constraints so far on the density of the Extragalactic Background Light (EBL) in the mid-infrared band. Assuming that the emitted spectrum is not harder than T mt ≈ 1.5, the HESS data support an EBL spectrum σλ -1 and density close to the lower limit from source counts measured by Spitzer, confirming the previous indications from the HEGRA data of IES 1426+428 (z = 0.129). Irrespective of the EBL models used, the intrinsic spectrum of IES 0229+200 is hard, thus locating the high-energy peak of its spectral energy distribution above a few TeV.

AB - Aims. To investigate the very high energy (VHE: > 100 GeV) y-ray emission from the high-frequency peaked BL Lac IES 0229+200. Methods. Observations of IES 0229+200 at energies above 580 GeV were performed with the High Energy Stereoscopic System (HESS) in 2005 and 2006. Results. IES 0229+200 is discovered by HESS to be an emitter of VHE photons. A signal is detected at the 6.6σ level in the HESS observations (41.8 h live time). The integral flux above 580 GeV is (9.4 ± 1.5 stat ± 1.9 syst) × 10 -13 cm -2 s -1 corresponding to ∼1.8% of the flux observed from the Crab Nebula. The data show no evidence for significant variability on any time scale. The observed spectrum is characterized by a hard power law (T = 2.50 ± 0.19 stat ± 0.10 syst) from 500 GeV to ∼15 TeV. Conclusions. The high-energy range and hardness of the observed spectrum, coupled with the object's relatively large redshift (z = 0.1396), enable the strongest constraints so far on the density of the Extragalactic Background Light (EBL) in the mid-infrared band. Assuming that the emitted spectrum is not harder than T mt ≈ 1.5, the HESS data support an EBL spectrum σλ -1 and density close to the lower limit from source counts measured by Spitzer, confirming the previous indications from the HEGRA data of IES 1426+428 (z = 0.129). Irrespective of the EBL models used, the intrinsic spectrum of IES 0229+200 is hard, thus locating the high-energy peak of its spectral energy distribution above a few TeV.

KW - BL lacertae objects: individual: IES 0229+200

KW - Galaxies

KW - Gamma rays: observations

UR - http://www.scopus.com/inward/record.url?scp=36549016623&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=36549016623&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:20078462

DO - 10.1051/0004-6361:20078462

M3 - Article

AN - SCOPUS:36549016623

SN - 0004-6361

VL - 475

SP - L9-L13

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 2

ER -

New constraints on the mid-IR EBL from the HESS discovery of VHE γ-rays from 1ES 0229+200

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