| Autor: |
Aharonian, F., Akhperjanian, A., Barres de Almeida, U., Bazer-Bachi, A., Becherini, Y., Behera, B., Benbow, W., Bernl?hr, K., Boisson, C., Bochow, A., Borrel, V., Braun, I., Brion, E., Brucker, J., Brun, P., B?hler, R., Bulik, T., B?sching, I., Boutelier, T., Carrigan, S., Chadwick, P., Charbonnier, A., Chaves, R., Cheesebrough, A., Chounet, L.-M., Clapson, A., Coignet, G., Dalton, M., Degrange, B., Deil, C., Dickinson, H., Djannati-Ata?, A., Domainko, W., O'C. Drury, L., Dubois, F., Dubus, G., Dyks, J., Dyrda, M., Egberts, K., Emmanoulopoulos, D., Espigat, P., Farnier, C., Feinstein, F., Fiasson, A., F?rster, A., Fontaine, G., F??ling, M., Gabici, S., Gallant, Y., G?rard, L., Giebels, B., Glicenstein, J., Gl?ck, B., Goret, P., Hadjichristidis, C., Hauser, D., Hauser, M., Heinz, S., Heinzelmann, G., Henri, G., Hermann, G., Hinton, J., Hoffmann, A., Hofmann, W., Holleran, M., Hoppe, S., Horns, D., Jacholkowska, A., de Jager, O., Jung, I., Katarzy?ski, K., Kaufmann, S., Kendziorra, E., Kerschhaggl, M., Khangulyan, D., Kh?lifi, B., Keogh, D., Komin, Nu., Kosack, K., Lamanna, G., Lenain, J.-P., Lohse, T., Marandon, V., Martin, J., Martineau-Huynh, O., Marcowith, A., Maurin, D., McComb, T., Medina, M., Moderski, R., Moulin, E., Naumann-Godo, M., de Naurois, M., Nedbal, D., Nekrassov, D., Niemiec, J., Nolan, S., Ohm, S., Olive, J.-F., de O?a Wilhelmi, E., Orford, K., Osborne, J., Ostrowski, M., Panter, M., Pedaletti, G., Pelletier, G., Petrucci, P.-O., Pita, S., P?hlhofer, G., Punch, M., Quirrenbach, A., Raubenheimer, B., Raue, M., Rayner, S., Renaud, M., Rieger, F., Ripken, J., Rob, L., Rosier-Lees, S., Rowell, G., Rudak, B., Rulten, C., Ruppel, J., Sahakian, V., Santangelo, A., Schlickeiser, R., Sch?ck, F., Schr?der, R., Schwanke, U., Schwarzburg, S., Schwemmer, S., Shalchi, A., Skilton, J., Sol, H., Spangler, D., Stawarz, ?., Steenkamp, R., Stegmann, C., Superina, G., Tam, P., Tavernet, J.-P., Terrier, R., Tibolla, O., van Eldik, C., Vasileiadis, G., Venter, C., Vialle, J., Vincent, P., Vivier, M., V?lk, H., Volpe, F., Wagner, S., Ward, M., Zdziarski, A., Zech, A. |
| Zdroj: |
Astronomy and Astrophysics; December 2008, Vol. 492 Issue: 1 pL25-L28, 4p |
| Abstrakt: |
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 ?-ray source HESS?J1745-290 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 ?-ray flux from this region. We find that an increase in the ?-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 ?-ray emission is produced within ~1014?cm (~100RS) of the supermassive black hole. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
