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## FERMIFHL - Second Catalog of Hard Fermi-LAT Sources (2FHL) |
HEASARC Archive |

**Name**

The source designation, 2FHL JHHMM.m+DDMM[e], constructed according to the
IAU Specifications for Nomenclature, in which the Right Ascension and
Declination have been truncated to 0.1 decimal minutes and 1', respectively.
The '2' refers to the second catalog and 'FHL' represents "Fermi Hard LAT". A
name ending with 'e' indicates an extended source.

**RA**

The Right Ascension of the gamma-ray source in the selected equinox in J2000
decimal degrees.

**Dec**

The Declination of the gamma-ray source in the selected equinox in J2000
decimal degrees.

**LII**

The Galactic Longitude of the gamma-ray source in decimal degrees.

**BII**

The Galactic Latitude of the gamma-ray source in decimal degrees.

**Error_Radius**

The position uncertainty at 68% confidence level in decimal degrees.

**Test_Statistic**

The test statistic.

**Spectral_Index**

The observed spectral index from a power-law fit.

**Spectral_Index_Error**

The 1-sigma uncertainty on the observed spectral index.

**Spectral_Index_D11**

The intrinsic spectral index (unattenuated by EBL) using the
observationally-based Dominguez et al. (2011) model.

**Spectral_Index_D11_Error**

The 1-sigma uncertainty on the intrinsic spectral index using the
observationally-based Dominguez et al. (2011) model.

**Spectral_Index_G12**

The intrinsic spectral index (un-attenuated by EBL) using the
observationally-based Gilmore et al. (2012) model.

**Spectral_Index_G12_Error**

The 1-sigma uncertainty on the intrinsic spectral index using the
observationally-based Gilmore et al. (2012) model.

**Flux**

The integral photon flux between 50 GeV and 2 TeV, in photon/cm^{2}/s.

**Flux_Error**

The 1-sigma uncertainty on integral photon flux between 50 GeV and 2 TeV, in
photon/cm^{2}/s.

**Energy_Flux**

The energy flux from 50 GeV to 2 TeV, in erg/cm^{2}/s.

**Energy_Flux_Error**

The 1-sigma uncertainty on energy flux from 50 GeV to 2 TeV, in erg/cm^{2}/s-1.

**Flux50_171_GeV**

The integral photon flux from 50 GeV to 171 GeV, in photon/cm^{2}/s.

**Flux50_171_GeV_Neg_Err**

The lower (negative) uncertainty on integral photon flux from 50 GeV to 171
GeV, in photon/cm^{2}/s.

**Flux50_171_GeV_Pos_Err**

The upper (positive) uncertainty on integral photon flux from 50 GeV to 171
GeV, in photon/cm^{2}/s.

**Sqrt_Ts50_171_GeV**

The square root of the Test Statistic between 50 GeV and 171 GeV.

**Flux171_585_GeV**

The integral photon flux from 171 GeV to 585 GeV, in photon/cm^{2}/s.

**Flux171_585_GeV_Neg_Err**

The lower (negative) uncertainty on integral photon flux from 171 GeV to 585
GeV, in photon/cm^{2}/s.

**Flux171_585_GeV_Pos_Err**

The upper (positive) uncertainty on integral photon flux from 171 GeV to 585
GeV, in photon/cm^{2}/s.

**Sqrt_Ts171_585_GeV**

The square root of the Test Statistic between 171 GeV and 585 GeV.

**Flux585_2000_GeV**

The integral photon flux from 585 GeV to 2 TeV, in photon/cm^{2}/s.

**Flux585_2000_GeV_Neg_Err**

The lower (negative) uncertainty on integral photon flux from 585 GeV to 2
TeV, in photon/cm^{2}/s.

**Flux585_2000_GeV_Pos_Err**

The upper (positive) uncertainty on integral photon flux from 585 GeV to 2
TeV, in photon/cm^{2}/s.

**Sqrt_Ts585_2000_GeV**

The square root of the Test Statistic between 585 GeV and 2 TeV.

**Npred**

The detected number of photons from the source as predicted from the best
fit.

**HEP_Energy**

The highest photon energy, in GeV.

**HEP_Prob**

The probability that the highest-energy photon is coming from the source, >=
0.85.

**Roi**

The region of interest number

**Assoc_Name**

The name of the most likely associated source.

**Assoc_Prob_Bay**

The probability of association from the Bayesian method.

**Assoc_Prob_LR**

The probability of association from the likelihood ratio method.

**Source_Class**

The class designation for the most likely association. Refer to the
accompanying paper for details of class designations and the association
method. The following abbreviations are used:

psr = pulsar pwn = pulsar wind nebula snr = supernova remnant spp = supernova remnant/pulsar wind nebula hmb = high-mass binary bin = binary sfr = star-forming region bll = BL Lac type of blazar bll-g = BL Lac type of blazar with prominent galaxy emission fsrq = FSRQ type of blazar agn = non-blazar active galaxy rdg = radio galaxy rdg/bll = radio galaxy / BL Lac bcu I = Blazar candidate of uncertain type I bcu II = Blazar candidate of uncertain type II bcu III = Blazar candidate of uncertain type III gal = normal galaxy (or part) galclu = galaxy cluster

**Redshift**

The redshift (when available) of the most likely associated source.

**Nupeak_Obs**

The observed synchrotron peak frequency.

**Assoc_3FGL**

The name of the most likely associated source in the 3FGL.

**Assoc_1FHL**

The name of the most likely associated source in the 1FHL.

**Assoc_TeVCat**

The name of the most likely associated source in the TeVCat.