The Search for Spatial Extension in High-latitude Sources Detected by the Fermi Large Area Telescope

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Details zur Publikation

Autorinnen und Autoren: Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Bissaldi E, Blandford RD, Bloom ED, Bonino R, Bottacini E, Brandt TJ, Bregeon J, Bruel P, Buehler R, Cameron RA, Caputo R, Caraveo PA, Castro D, Cavazzuti E, Charles E, Cheung CC, Chiaro G, Ciprini S, Cohen-Tanugi J, Costantin D, Cutini S, D'Ammando F, De Palma F, Desai A, Di Lalla N, Di Mauro M, Di Venere L, Favuzzi C, Finke J, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giordano F, Giroletti M, Green D, Grenier IA, Guillemot L, Guiriec S, Hays E, Hewitt JW, Horan D, Johannesson G, Kensei S, Kuss M, Larsson S, Latronico L, Lemoine-Goumard M, Li J, Longo F, Loparco F, Lovellette MN, Lubrano P, Magill JD, Maldera S, Manfreda A, Mazziotta MN, Mcenery JE, Meyer M, Mizuno T, Monzani ME, Morselli A, Moskalenko IV, Negro M, Nuss E, Omodei N, Orienti M, Orlando E, Ormes JF, Palatiello M, Paliya VS, Paneque D, Perkins JS, Persic M, Pesce-Rollins M, Piron F, Porter TA, Principe G, Raino S, Rando R, Rani B, Razzaque S, Reimer A, Reimer O, Reposeur T, Sgro C, Siskind EJ, Spandre G, Spinelli P, Suson DJ, Tajima H, Thayer JB, Tibaldo L, Torres DF, Tosti G, Valverde J, Venters TM, Vogel M, Wood K, Wood M, Zaharijas G, Biteau J
Zeitschrift: Astrophysical Journal Supplement Series
Jahr der Veröffentlichung: 2018
Band: 237
Heftnummer: 2
ISSN: 0067-0049


We present a search for spatial extension in high-latitude (vertical bar b vertical bar > 5 degrees) sources in recent Fermi point source catalogs. The result is the Fermi High-Latitude Extended Sources Catalog, which provides source extensions (or upper limits thereof) and likelihood profiles for a suite of tested source morphologies. We find 24. extended sources, 19 of which were not previously characterized as extended. These include sources that are potentially associated with supernova remnants and star-forming regions. We also found extended.-ray emission in the vicinity of the Cen. A radio lobes and-at GeV energies for the first time-spatially coincident with the radio emission of the SNR CTA 1, as well as from the Crab Nebula. We also searched for halos around active galactic nuclei, which are predicted from electromagnetic cascades induced by the e(+)e(-) pairs that are deflected in intergalactic magnetic fields. These pairs are produced when gamma-rays interact with background radiation fields. We do not find evidence for extension in individual sources or in stacked source samples. This enables us to place limits on the flux of the extended source components, which are then used to constrain the intergalactic magnetic field to be stronger than 3 x 10(-16) G for a coherence length lambda greater than or similar to 10 kpc, even when conservative assumptions on the source duty cycle are made. This improves previous limits by several orders of magnitude.

FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Funk, Stefan Prof. Dr.
Lehrstuhl für Physik
Principe, Giacomo
Lehrstuhl für Physik

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Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D.,... Biteau, J. (2018). The Search for Spatial Extension in High-latitude Sources Detected by the Fermi Large Area Telescope. Astrophysical Journal Supplement Series, 237(2).

Ackermann, Markus, et al. "The Search for Spatial Extension in High-latitude Sources Detected by the Fermi Large Area Telescope." Astrophysical Journal Supplement Series 237.2 (2018).


Zuletzt aktualisiert 2019-17-07 um 12:08