Title: The Third Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope Authors: M. Ackermann, M. Ajello, W. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, J. Gonzalez, R. Bellazzini, E. Bissaldi, R. Blandford, E. Bloom, R. Bonino, E. Bottacini, T. Brandt, J. Bregeon, R. Britto, P. Bruel, R. Buehler, S. Buson, G. Caliandro, R. Cameron, M. Caragiulo, P. Caraveo, J. Casandjian, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, C. Cheung, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. Cohen-Tanugi, L. Cominsky, J. Conrad, S. Cutini, R. D'Abrusco, F. D'Ammando, A. Angelis, R. Desiante, S. Digel, L. Venere, P. Drell, C. Favuzzi, S. Fegan, E. Ferrara, J. Finke, W. Focke, A. Franckowiak, L. Fuhrmann, A. Furniss, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. Grenier, J. Grove, S. Guiriec, J.W. Hewitt, A. Hill, D. Horan, G. J'ohannesson, A. Johnson, W. Johnson, J. Kataoka, M. Kuss, G. Mura, S. Larsson, L. Latronico, C. Leto, J. Li, L. Li, F. Longo, F. Loparco, B. Lott, M. Lovellette, P. Lubrano, G. Madejski, M. Mayer, M. Mazziotta, J. McEnery, P. Michelson, T. Mizuno, A. Moiseev, M. Monzani, A. Morselli, I. Moskalenko, S. Murgia, E. Nuss, M. Ohno, T. Ohsugi, R. Ojha, N. Omodei, M. Orienti, E. Orlando, A. Paggi, D. Paneque, J. Perkins, M. Pesce-Rollins, F. Piron, G. Pivato, T. Porter, S. Rain`o, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, R. Romani, D. Salvetti, M. Schaal, F. Schinzel, A. Schulz, C. Sgr`o, E. Siskind, K. Sokolovsky, F. Spada, G. Spandre, P. Spinelli, L. Stawarz, D. Suson, H. Takahashi, T. Takahashi, Y. Tanaka, J. Thayer, J. Thayer, L. Tibaldo, D. Torres, E. Torresi, G. Tosti, E. Troja, Y. Uchiyama, G. Vianello, B. Winer, K. Wood, S. Zimmer Abstract: The third catalog of active galactic nuclei (AGNs) detected by the Fermi-LAT (3LAC) is presented. It is based on the third Fermi-LAT catalog (3FGL) of sources detected with a test statistic (TS) greater than 25, using the first 4 years of data. The 3LAC includes 1591 AGNs located at high Galactic latitudes (|b|>10{\deg}), which is a 71% increase over the second catalog that was based on 2 years of data. There are 28 duplicate associations (two counterparts to the same gamma-ray source), thus 1563 of the 2192 high-latitude gamma-ray sources of the 3FGL catalog are AGNs. A very large majority of these AGNs (98%) are blazars. About half of the newly detected blazars are of unknown type, i.e., they lack spectroscopic information of sufficient quality to determine the strength of their emission lines. Based on their spectral properties, these sources are evenly split between FSRQs and BL~Lacs. The general properties of the 3LAC sample confirm previous findings from earlier catalogs, but some new subclasses (e.g., intermediate- and high-synchrotron-peaked FSRQs) have now been significantly detected. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 106 . This file datafile7.txt 164 1591 3LAC sample (high latitude) datafile9.txt 164 182 3LAC sample (low latitude) datafile10.txt 132 168 Missing 3LAC sources datafile11.txt 111 1591 3LAC sources: Flux Table (high latitude) datafile12.txt 111 182 3LAC sources: Flux Table (low latitude) -------------------------------------------------------------------------------- Byte-by-byte Description of file: datafile7.txt -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 12 A12 --- Name Name of the 3FGL source 14 A1 --- Clean Source in Clean sample: Y=Yes, N=No 16- 41 A26 --- CName Name of the counterpart 46- 52 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) (1) 55- 63 F9.5 deg DEdeg Declination in decimal degrees (J2000) (1) 70- 74 F5.3 deg Sep Angular separation with counterpart 81- 85 F5.3 deg PosErr 95% error radius 88- 94 A7 --- SpType Optical class 96- 98 A3 --- SEDType Type of SED; "-" indicates a NULL value 104-109 F4.3 Hz NupSyn-Mes Observer frame position of synchrotron peak; "-" indicates a NULL value 115-120 F4.3 Hz NupSyn-Rf Rest frame position of synchrotron peak: "0.0" indicates a NULL value 125-131 F7.3 --- Redshift Redshift (2): "0.0" indicates a NULL value 138-142 F6.2 --- BayProb Bayesian probability (2) 149-153 F6.2 --- LR-RGProb Likelihood Ratio reliability for Radio-gamma association (2) 160-164 F6.2 --- LR-XGProb Likelihood Ratio reliability for X-gamma association (2) -------------------------------------------------------------------------------- Note (1): Of the radio counterpart. Note (2): 0.0 indicates a value below the threshold of 80% -------------------------------------------------------------------------------- Byte-by-byte Description of file: datafile9.txt -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 12 A12 --- Name Name of the 3FGL source 14 A1 --- Clean Source in Clean sample: Y=Yes, N=No 16- 41 A26 --- CName Name of the counterpart 46- 52 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) (1) 55- 63 F9.5 deg DEdeg Declination in decimal degrees (J2000) (1) 70- 74 F5.3 deg Sep Angular separation with counterpart 81- 85 F5.3 deg PosErr 95% error radius 88- 94 A7 --- SpType Optical class 96- 98 A3 --- SEDType Type of SED; "-" indicates a NULL value 104-109 F4.3 Hz NupSyn-Mes Observer frame position of synchrotron peak; "-" indicates a NULL value 115-120 F4.3 Hz NupSyn-Rf Rest frame position of synchrotron peak: "0.0" indicates a NULL value 125-131 F7.3 --- Redshift Redshift (2): "0.0" indicates a NULL value 138-142 F6.2 --- BayProb Bayesian probability (2) 149-153 F6.2 --- LR-RGProb Likelihood Ratio reliability for Radio-gamma association (2) 160-164 F6.2 --- LR-XGProb Likelihood Ratio reliability for X-gamma association (2) -------------------------------------------------------------------------------- Note (1): Of the radio counterpart. Note (2): 0.0 indicates a value below the threshold of 80% -------------------------------------------------------------------------------- Byte-by-byte Description of file: datafile10.txt -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-23 A23 --- CName Name of the counterpart 28-35 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) (1) 40-47 F9.5 deg DEdeg Declination in decimal degrees (J2000) (1) 51-56 A7 --- SpType Optical class 60-62 A3 --- SEDType Type of SED; "-" indicates a NULL value 71-75 F7.3 --- Redshift Redshift (2): "0.0" indicates a NULL value 78-94 A17 --- Name-3FGL Name of the 3FGL source 97-113 A17 --- Name-2FGL Name of the 2FGL source 116-132 A17 --- Name-1FGL Name of the 1FGL source -------------------------------------------------------------------------------- Note (1): Of the radio counterpart. -------------------------------------------------------------------------------- Byte-by-byte Description of file: datafile11.txt -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 12 A12 --- Name Name of the 3FGL source 14 A1 --- Clean Source in Clean sample: Y=Yes, N=No 16- 41 A26 --- CName Name of the counterpart 44- 52 F6.2 mJy RadFlux Radio flux 54 A1 --- Flag The flag value refers to radio flux (1) 59- 66 F6.3 10-20J/cm2/s XFlux X-ray flux; units of 1e-13 erg/cm2/s 72- 77 F6.3 mag USNO-Vmag USNO V band magniude: "0.0" indicates a NULL value 84- 89 F6.3 mag SDSS-Vmag SDSS V band magniude: "0.0" indicates a NULL value 96- 100 F6.2 --- ARO Rest frame, multi-frequency optical/X-ray spectral index: "-9.9" indicates a NULL value 107- 111 F6.2 --- AOX Rest frame, multi-frequency radio/optical spectral index: "-9.9" indicates a NULL value Note (1): N indicates at 1.4GHz, S indicates at 845 MHz, A indicates 20 GHz, P indicates 4.8 GHz and F indicates at 1.4GHz -------------------------------------------------------------------------------- Byte-by-byte Description of file: datafile12.txt -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 12 A12 --- Name Name of the 3FGL source 14 A1 --- Clean Source in Clean sample: Y=Yes, N=No 16- 41 A26 --- CName Name of the counterpart 44- 52 F6.2 mJy RadFlux Radio flux 54 A1 --- Flag The flag value refers to radio flux (1) 59- 66 F6.3 10-20J/cm2/s XFlux X-ray flux; units of 1e-13 erg/cm2/s 72- 77 F6.3 mag USNO-Vmag USNO V band magniude: "0.0" indicates a NULL value 84- 89 F6.3 mag SDSS-Vmag SDSS V band magniude: "0.0" indicates a NULL value 96- 100 F6.2 --- ARO Rest frame, multi-frequency optical/X-ray spectral index: "-9.9" indicates a NULL value 107- 111 F6.2 --- AOX Rest frame, multi-frequency radio/optical spectral index: "-9.9" indicates a NULL value Note (1): N indicates at 1.4GHz, S indicates at 845 MHz, A indicates 20 GHz, P indicates 4.8 GHz and F indicates at 1.4GHz --------------------------------------------------------------------------------