FGL2 {fermicatsR}

2FGL Catalog (Fermi Large Area Telescope Second Source Catalog)

Description

Fermi Large Area Telescope Second Source Catalog (2FGL). Nolan, P. L. et al., The Astrophysical Journal Supplement Series, 199, 31 (2012).

Usage

FGL2

Format

A data frame with 137 variables on 1873 gamma-ray sources.

Details

Initial Release: 11 July 2011 Latest Release: gll_psc_v09.fit (18 May 2015)

Fields

Source_Name

2FGL JHHMM.m+DDMM[c/e], constructed according to IAU Specifications for Nomenclature; m is decimal minutes of R.A.; in the name R.A. and decl. are truncated at 0.1 decimal minutes and 1' , respectively; 'c' indicates that based on the region of the sky the source is considered to be potentially confused with Galactic diffuse emission; e indicates a source that was modeled as spatially extended (see Section 3.4 of 2FGL paper)

RAJ2000

Right Ascension, J2000, deg, three decimal places

DEJ2000

Declination, J2000, deg, three decimal places

GLON

Galactic longitude, deg, three decimal places

GLAT

Galactic latitude, deg, three decimal places

Conf_68_SemiMajor

Semimajor radius of 68% confidence region, deg, three decimal places

Conf_68_SemiMinor

Semiminor radius of 68% confidence region, deg, three decimal places

Conf_68_PosAng

Position angle of 68% confidence region, deg. east of north, 0 decimal places

Conf_95_SemiMajor

Semimajor radius of 95% confidence region, deg, three decimal places

Conf_95_SemiMinor

Semiminor radius of 95% confidence region, deg, three decimal places

Conf_95_PosAng

Position angle of 95% confidence region, deg. east of north, 0 decimal places

Signif_Avg

Significance derived from likelihood TS for 100 MeV\342\200\223100 GeV analysis, one decimal place

Pivot_Energy

Energy at which error on differential flux is minimal, in MeV

Flux_density

Differential flux at Pivot_Energy, in cm^-2 MeV^-1 s^-1

Unc_Flux_Density

1 sigma error on differential flux at Pivot_Energy, in cm^-2 MeV^-1 s^-1

Spectral_Index

Best-fit photon number power-law index. For LogParabola spectra, index at Pivot_Energy; for PLExpCutoff spectra, low-energy index.

Unc_Spectral_Index

1 sigma error on Spectral_Index

Flux1000

Integral flux from 1 to 100 GeV, in cm^-2 s^-1

Unc_Flux1000

1 sigma error on integral flux from 1 to 100 GeV, in cm^-2 s^-1

Energy_Flux100

Energy flux from 100 MeV to 100 GeV obtained by spectral fitting, in erg cm^-2 s^-1

Unc_Energy_Flux

1 sigma error on energy flux from 100 MeV to 100 GeV, in erg cm^-2 s^-1

Signif_Curve

Significance (in sigma units) of the fit improvement between power-law and either LogParabola (for ordinary sources) or PLExpCutoff (for pulsars). A value greater than 4 indicates significant curvature.

SpectrumType

Spectral type (PowerLaw, LogParabola, PLExpCutoff)

beta

Curvature parameter (Beta) for LogParabola. NULL for other spectral types

Unc_beta

1 sigma error on Beta for LogParabola. NULL for other spectral types

Cutoff

Cutoff energy as exp(-E/Cutoff) for PLExpCutoff, in MeV. NULL for other spectral types.

Unc_Cutoff

1 sigma error on cutoff energy for PLExpCutoff, in MeV. NULL for other spectral types.

PowerLaw_Index

Best-fit power-law index. Equal to Spectral_Index if SpectrumType is PowerLaw.

Flux30_100

Integral flux from 30 to 100 MeV (not filled)

Unc_Flux30_100

1 sigma error on integral flux from 30 to 100 MeV (not filled)

Sqrt_TS30_100

Square root of the TS between 30 and 100 MeV (not filled)

Flux100_300

Integral flux from 100 to 300 MeV, in cm^-2 s^-1

Unc_Flux100_300

1 sigma error on integral flux from 100 to 300 MeV, in cm^-2 s^-1

Sqrt_TS100_300

Square root of the TS between 100 to 300 MeV

Flux300_1000

Integral flux from 100 to 300 MeV, in cm^-2 s^-1

Unc_Flux300_1000

1 sigma error on integral flux from 300 MeV to 1 GeV, in cm^-2 s^-1

Sqrt_TS300_1000

Square root of the TS between 300 MeV to 1 GeV

Flux1000_3000

Integral flux from 1 to 3 GeV, in cm^-2 s^-1

Unc_Flux1000_3000

1 sigma error on integral flux from 1 to 3 GeV, in cm^-2 s^-1

Sqrt_TS1000_3000

Square root of the TS between 1 to 3 GeV

Flux3000_10000

Integral flux from 3 to 10 GeV, in cm^-2 s^-1

Unc_Flux3000_10000

1 sigma error on integral flux from 3 to 10 GeV, in cm^-2 s^-1

Sqrt_TS3000_10000

Square root of the TS between 3 to 10 GeV

Flux10000_100000

Integral flux from 10 to 100 GeV, in cm^-2 s^-1

Unc_Flux10000_100000

1 sigma error on integral flux from 10 to 100 GeV, in cm^-2 s^-1

Sqrt_TS10000_100000

Square root of the TS between 10 to 100 GeV

Variability_Index

Sum of 2xLog(Likelihood) comparison between the flux fitted in 24 time segments and a flat light curve over the full two-year catalog interval. A value greater than 41.64 indicates < 1% chance of being a steady source.

Signif_Peak

Source significance in peak interval in sigma units

Flux_Peak

Peak integral flux from 100 MeV to 100 GeV, in cm^-2 s^-1

Unc_Flux_Peak

1 sigma error on peak integral flux, in cm^-2 s^-1

Time_Peak

Time of center of interval in which peak flux was measured

Peak_Interval

Length of interval in which peak flux was measured

Flux_History.1 ... Flux_History.24

Integral flux from 100 MeV to 100 GeV in time interval 1 ... 24, in cm^-2 s^-1

Unc_Flux_History.1 ... Unc_Flux_History.24

Error on the integral flux from 100 MeV to 100 GeV in time interval 1 ... 24, in cm^-2 s^-1, using the method indicated in Unc_Flag_History column and added in quatrature with 3% systematic component.

Unc_Flag_History.1 ... Unc_Flag_History.24

1 if it is half of the difference between the 2 sigma upper limit and the maximum likelihood value given in Flux_History; 0 if it is the 1 sigma uncertainty derived from a significant detection in the interval.

Extended_Source_Name

Cross-reference to the ExtendedSources extension for extended sources, if any.

0FGL_Name

Name of the corresponding 0FGL source, if any.

1FGL Name

Name of the corresponding 1FGL source, if any.

ASSOC_GAM1

Identification or positional associations with AGILE (1AGL)source

ASSOC_GAM2

Identification or positional associations with 3EG source

ASSOC_GAM3

Identification or positional associations with EGR source

TEVCAT_FLAG

Positional association with a TeVCat source, P for angular size < 40', E for extended, N if no TeV association

ASSOC_TEV

Name of likely corresponding TeV source from TevCat.

CLASS1

Class designation for most likely association. Capital letters indicate firm identifications; lower-case letters indicate associations: Pulsar, identified by pulsations (PSR), Pulsar, no pulsations seen in LAT yet (psr), Pulsar wind nebula (PWN), Supernova remnant (SNR), Supernova remnant/pulsar wind nebula (spp), Globular cluster (glc), High-mass binary (HMB), Nova (NOV), Blazar of the BL Lac type (BZB), Blazar of the FSRQ type (BZQ), Non-blazar active galaxy (AGN), Radio galaxy (RDG), Seyfert galaxy (SEY), Active galaxy of uncertain type (AGU), Normal galaxy (GAL), Starburst galaxy (sbg), Unassociated source ( ).

CLASS2

2nd class designation for associated source.

ASSOC1

Name of identified or likely associated source.

ASSOC2

Alternate name of identified or likely associated source.

Flags

Binary coding. See Table 3 of 2FGL paper for the definition of the various Analysis Flags.

Source

http://fermi.gsfc.nasa.gov/ssc/data/access/lat/2yr_catalog/