FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG

We present the second catalog of high-energy γ-ray sources detected by the Large Area Telescope (LAT), the primary science instrument on the Fermi Gamma-ray Space Telescope (Fermi), derived from data taken during the first 24 months of the science phase of the mission, which began on 2008 August 4. Source detection is based on the average flux over the 24 month period. The second Fermi-LAT catalog (2FGL) includes source location regions, defined in terms of elliptical fits to the 95% confidence regions and spectral fits in terms of power-law, exponentially cutoff power-law, or log-normal forms. Also included are flux measurements in five energy bands and light curves on monthly intervals for each source. Twelve sources in the catalog are modeled as spatially extended. We provide a detailed comparison of the results from this catalog with those from the first Fermi-LAT catalog (1FGL). Although the diffuse Galactic and isotropic models used in the 2FGL analysis are improved compared to the 1FGL catalog, we attach caution flags to 162 of the sources to indicate possible confusion with residual imperfections in the diffuse model. The 2FGL catalog contains 1873 sources detected and characterized in the 100 MeV to 100 GeV range of which we consider 127 as being firmly identified and 1171 as being reliably associated with counterparts of known or likely γ-ray-producing source classes.

Vlasios Vasileiou | Gino Tosti | Yasushi Fukazawa | R. E. Hughes | Brian L Winer | Ronaldo Bellazzini | Paolo Giommi | D. Fabiani | Teruaki Enoto | Pascal Bruel | Denis Bastieri | Keith Bechtol | O. Tibolla | M. Naumann-Godo | J. Mehault | Felix Ryde | Chris R. Shrader | Emanuele Bonamente | T. Glanzman | Michele Pinchera | Carmelo Sgro | M. Frailis | Patrizia A. Caraveo | Sara Cutini | Filippo D'Ammando | Dario Gasparrini | S. Funk | P. Lubrano | B. Giebels | T. J. Johnson | Elliott D. Bloom | M. Kerr | Luca Latronico | Gloria Spandre | Lucas Guillemot | Riccardo Campana | L. Tibaldo | Alex Drlica-Wagner | Luca Baldini | Massimo Minuti | Isabelle A. Grenier | A. De Angelis | S. Ciprini | Junichiro Katsuta | Masanori Ohno | D. Landriu | Enrico Massaro | Stephan Zimmer | N. Giglietto | Kent S. Wood | D. Dumora | W. B. Atwood | Jean Ballet | R. Buehler | G. A. Caliandro | R. A. Cameron | E. Charles | A. Chekhtman | F. de Palma | F. Gargano | M. Kuss | M. N. Mazziotta | Tsunefumi Mizuno | M. Pesce-Rollins | F. Piron | G. Pivato | S. Rainò | Giacomo Vianello | A. De Luca | Giovanni F. Bignami | Robin H. D. Corbet | J. B. Thayer | Johan Bregeon | P. Fusco | F. Loparco | E. Antolini | M. Lemoine-Goumard | Daniel Jeffrey Suson | L. Falletti | A. Morselli | Persis S. Drell | Magnus Axelsson | Peter Michelson | A. A. Moiseev | M. Mongelli | Guido Barbiellini | Neil Gehrels | Johann Cohen-Tanugi | D. Hadasch | D. Paneque | A. Cannon | J. S. Perkins | W. McConville | T. A. Porter | Seth W. Digel | Ryosuke Itoh | L. R. Cominsky | M. Razzano | Francesco Longo | C. Sbarra | Jun Kataoka | Igor V. Moskalenko | E. Cavazzuti | J. Lande | J. Knödlseder | Jay P. Norris | T. Ohsugi | R. Chipaux | Marcello Giroletti | David L. Wood | Hiroyasu Tajima | Judith Lea Racusin | Jonathan F. Ormes | J. E. Grove | E. Troja | A. Belfiore | Takeshi Nakamori | Hiromitsu Takahashi | David J. Thompson | Marco Ajello | M. Ceccanti | Mark S. Strickman | Roger D. Blandford | F. Giordano | Omer Celik | N. Kawai | Olaf Reimer | S. Murgia | B. Berenji | J. M. Casandjian | L. Escande | E. Hays | D. Horan | E. J. Siskind | C. Favuzzi | W. B. Focke | W. Mitthumsiri | C. Monte | Tadayuki Takahashi | James Chiang | Yasunobu Uchiyama | D. Kocevski | Soebur Razzaque | J. Chiang | J. Grove | D. Wood | M. Frailis | A. Moiseev | J. Scargle | N. Gehrels | M. Razzano | R. Blandford | K. Bechtol | A. Drlica-Wagner | L. Cominsky | M. Ackermann | J. Conrad | P. Giommi | J. Vandenbroucke | S. Digel | A. Morselli | Z. Yang | V. Vitale | N. Kawai | C. Sbarra | T. Ohsugi | B. Lott | E. Troja | R. Itoh | G. Bignami | D. Thompson | P. Drell | G. Barbiellini | A. Angelis | H. Sadrozinski | B. Winer | R. Hughes | J. Mcenery | R. Johnson | N. Giglietto | P. Spinelli | R. Bellazzini | J. Ormes | C. Cecchi | K. Wood | T. Kamae | P. Bruel | M. Roth | D. Paneque | S. Ciprini | D. Gasparrini | N. Omodei | J. Racusin | A. V. Etten | D. Kocevski | D. Fabiani | F. D’Ammando | Y. Fukazawa | T. Mizuno | G. Tosti | M. Werner | F. Longo | J. Ballet | E. Ferrara | W. Mcconville | E. Bloom | G. Godfrey | E. Bonamente | R. Chipaux | M. Ceccanti | L. Latronico | G. Spandre | A. Chekhtman | T. Schalk | P. Lubrano | A. Borgland | T. Brandt | J. Panetta | R. Claus | T. Glanzman | D. Smith | S. Razzaque | S. Fegan | D. Horan | H. Katagiri | J. Kataoka | M. Naumann-Godo | I. Grenier | M. Mongelli | P. Caraveo | A. Bouvier | A. Cannon | J. Perkins | S. Murgia | J. Cohen-Tanugi | J. Thayer | J. Thayer | F. Palma | W. Atwood | C. Dermer | M. Axelsson | T. Enoto | J. Katsuta | G. Madejski | T. Nakamori | M. Ohno | M. Ozaki | H. Tajima | Hiromitsu Takahashi | Tadayuki Takahashi | Takaaki Tanaka | Y. Uchiyama | A. Johnson | A. Waite | E. Silva | S. Funk | E. Massaro | C. Shrader | L. Guillemot | S. Ritz | R. Rando | M. Ajello | A. Allafort | D. Bastieri | R. Buehler | S. Buson | R. Cameron | A. Luca | R. Dubois | W. Focke | B. Giebels | D. Hadasch | M. Hayashida | T. Johnson | J. Knödlseder | J. Lande | M. Minuti | A. Okumura | A. Reimer | O. Reimer | F. Ryde | L. Tibaldo | O. Tibolla | D. Torres | R. Campana | A. Hill | A. Harding | L. Baldini | J. Bregeon | M. Kuss | M. Pinchera | C. Sgro’ | M. Strickman | E. Cavazzuti | S. Guiriec | S. Cutini | M. Brigida | G. Caliandro | C. Favuzzi | F. Gargano | S. Germani | F. Giordano | F. Loparco | M. Mazziotta | C. Monte | M. Pesce-Rollins | S. Rainó | F. Piron | P. Nolan | P. Michelson | M. Kerr | M. Lemoine-Goumard | P. Fortin | O. Celik | C. Cheung | M. DeCesar | A. Abdo | D. Parent | P. Parkinson | J. Casandjian | B. Berenji | E. Bottacini | E. Charles | P. Fusco | M. Giroletti | E. Hays | G. Jóhannesson | M. Lovellette | W. Mitthumsiri | I. Moskalenko | E. Nuss | E. Orlando | T. Porter | T. Reposeur | E. Siskind | D. Suson | G. Vianello | T. Burnett | T. Johnson | D. Salvetti | M. Grondin | D. Davis | J. Méhault | M. Pierbattista | A. Belfiore | V. Vasileiou | X. Hou | D. Landriu | M. Monzani | G. Pivato | M. Tinivella | M. Wood | S. Zimmer | D. Dumora | M. Garde | J. Norris | R. Romani | Pengfei Wang | R. Corbet | L. Rochester | E. Antolini | P. Hartog | L. Falletti | Y. Hanabata | M. Marelli | R. Rousseau | R. P. Johnson | M. Brigida | P. Spinelli | Diego F. Torres | J. D. Scargle | R. Claus | Hf-W Sadrozinski | Hideaki Katagiri | Claudia Cecchi | Takaaki Tanaka | D. S. Davis | T. H. Burnett | S. Buson | C. D. Dermer | R. Dubois | S. J. Fegan | S. Germani | G. Godfrey | A. S. Johnson | T. Kamae | B. Lott | M. N. Lovellette | G. M. Madejski | P. L. Nolan | Akira Okumura | Markus Ackermann | Eugenio Bottacini | Jan Conrad | M. Gustafsson | Adam B. Hill | G. Jóhannesson | M. E. Monzani | E. Nuss | Robert R. Rando | A. Reimer | T. Reposeur | S. Ritz | Alice K. Harding | Aous A. Abdo | Aw Borgland | C. C. Cheung | E. Do Couto E Silva | Pascal D. Fortin | M-H Grondin | Sylvain Guiriec | Yoshitaka Hanabata | Morihiro Hayashida | Nicola Omodei | Elena Orlando | M. Ozaki | J. H. Panetta | D. Parent | L. S. Rochester | M. Roth | David Sanchez | P. M. Saz Parkinson | T. L. Schalk | M. S. Shaw | D. A. Smith | J. G. Thayer | V. Vitale | A. P. Waite | Pengfei Wang | M. Gustafsson | T. J. Brandt | A. Bouvier | J. Bonnell | B. Canadas | M. Deklotz | L. Escande | G. Iafrate | A. Lionetto | T. Nymark | D. Sanchez | T. Stephens | F. Tinebra | B. V. Klaveren | E. Wallace | D. Salvetti | M. Werner | Alice Allafort | M. Llena Garde | Martino Marelli | Julie McEnery | M. Pierbattista | Rw Romani | A. Van Etten | M. Wood | Justin Vandenbroucke | G. Iafrate | Z. Yang | Elizabeth Colleen Ferrara | P. R. den Hartog | M. Tinivella | B. Canadas | M. Deklotz | A. M. Lionetto | T. E. Stephens | F. Tinebra | E. Wallace | J. Bonnell | X. Hou | B. Van Klaveren | M. E. DeCesar | T. E. Johnson | T. Nymark | R. Rousseau | T. Schalk | T. Schalk | A. Reimer | J. Conrad | M. Shaw | H. Takahashi | M. Roth | E. Charles | S. Rainò | B. Cañadas | R. Hughes | Pengfei Wang | M. L. Garde

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