Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/24843
Title: | Fermi Large Area Telescope Detection of Extended Gamma-Ray Emission from the Radio Galaxy Fornax A | Authors: | Ackermann, M. Ajello, M. Baldini, L. Ballet, J. Barbiellini, G. Bastieri, D. Bellazzini, R. Bissaldi, E. Blandford, R. D. Bloom, E. D. Bonino, R. Fermi LAT Collaboration Bruel, P. Buehler, R. Buson, S. Caliandro, G. A. Cameron, R. A. Caragiulo, M. CARAVEO, PATRIZIA Cavazzuti, E. Cecchi, C. de Palma, F. Charles, E. Chekhtman, A. Cheung, C. C. Chiaro, G. Ciprini, S. Cohen, J. M. Cohen-Tanugi, J. Costanza, F. Cutini, S. D'AMMANDO, FILIPPO Desiante, R. Davis, D. S. de Angelis, A. Digel, S. W. Di Lalla, N. Di Mauro, M. Di Venere, L. Favuzzi, C. Fegan, S. J. Ferrara, E. C. Focke, W. B. Guiriec, S. Fukazawa, Y. Funk, S. Fusco, P. Gargano, F. Gasparrini, D. Georganopoulos, M. Giglietto, N. Giordano, F. GIROLETTI, MARCELLO Godfrey, G. Hays, E. Green, D. Grenier, I. A. Hewitt, J. W. Hill, A. B. Jogler, T. Jóhannesson, G. Kensei, S. Kuss, M. Larsson, S. Latronico, L. Michelson, P. F. Li, J. Li, L. Longo, F. Loparco, F. Lubrano, P. Magill, J. D. Maldera, S. Manfreda, A. Mayer, M. Mazziotta, M. N. Mitthumsiri, W. McConville, W. McEnery, J. E. Mizuno, T. Monzani, M. E. Morselli, A. Moskalenko, I. V. Murgia, S. Negro, M. Nuss, E. Ohno, M. Razzano, M. Ohsugi, T. Orienti, M. Orlando, E. Ormes, J. F. Paneque, D. Perkins, J. S. Pesce-Rollins, M. Piron, F. Pivato, G. Porter, T. A. Reimer, A. Rainò, S. Rando, R. Reimer, O. Schmid, J. Sgrò, C. Simone, D. Siskind, E. J. Spada, F. Spandre, G. Spinelli, P. Brandt, T. J. Stawarz, Ł. Takahashi, H. Thayer, J. B. Thompson, D. J. Torres, D. F. Tosti, G. Troja, E. Vianello, G. Wood, K. S. Wood, M. Bregeon, J. Zimmer, S. |
Issue Date: | 2016 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 826 | Issue: | 1 | First Page: | 1 | Abstract: | We report the Fermi Large Area Telescope detection of extended γ-ray emission from the lobes of the radio galaxy Fornax A using 6.1 years of Pass 8 data. After Centaurus A, this is now the second example of an extended γ-ray source attributed to a radio galaxy. Both an extended flat disk morphology and a morphology following the extended radio lobes were preferred over a point-source description, and the core contribution was constrained to be < 14% of the total γ-ray flux. A preferred alignment of the γ-ray elongation with the radio lobes was demonstrated by rotating the radio lobes template. We found no significant evidence for variability on ∼0.5 year timescales. Taken together, these results strongly suggest a lobe origin for the γ-rays. With the extended nature of the > 100 MeV γ-ray emission established, we model the source broadband emission considering currently available total lobe radio and millimeter flux measurements, as well as X-ray detections attributed to inverse Compton (IC) emission off the cosmic microwave background (CMB). Unlike the Centaurus A case, we find that a leptonic model involving IC scattering of CMB and extragalactic background light (EBL) photons underpredicts the γ-ray fluxes by factors of about ∼2-3, depending on the EBL model adopted. An additional γ-ray spectral component is thus required, and could be due to hadronic emission arising from proton-proton collisions of cosmic rays with thermal plasma within the radio lobes. | URI: | http://hdl.handle.net/20.500.12386/24843 | URL: | https://iopscience.iop.org/article/10.3847/0004-637X/826/1/1 | ISSN: | 0004-637X | DOI: | 10.3847/0004-637X/826/1/1 | Bibcode ADS: | 2016ApJ...826....1A | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Ackermann_2016_ApJ_826_1.pdf | PDF editoriale | 1.04 MB | Adobe PDF | View/Open |
Page view(s)
73
checked on Apr 20, 2024
Download(s)
26
checked on Apr 20, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.