J/ApJ/706/L7 The Fermi LAT sky as seen by INTEGRAL/IBIS (Ubertini+, 2009)
The Fermi/LAT sky as seen by INTEGRAL/IBIS. Ubertini P., Sguera V., Stephen J.B., Bassani L., Bazzano A., Bird A.J. <Astrophys. J., 706, L7-L11 (2009)> =2009ApJ...706L...7U
ADC_Keywords: Gamma rays ; Cross identifications ; Active gal. nuclei ; Pulsars ; Binaries, X-ray Keywords: gamma rays: observations Abstract: In this Letter we present the result of the cross correlation between the fourth INTEGRAL/IBIS soft gamma-ray catalog, in the range 20-100keV, and the Fermi LAT bright source list of objects emitting in the 100MeV-100GeV range. The main result is that only a minuscule part of the more than 720 sources detected by INTEGRAL and the population of 205 Fermi LAT sources are detected in both spectral regimes. This is in spite of the mCrab INTEGRAL sensitivity for both galactic and extragalactic sources and the breakthrough, in terms of sensitivity, achieved by Fermi at MeV-GeV energies. The majority of the 14 Fermi LAT sources clearly detected in the fourth INTEGRAL/IBIS catalog are optically identified active galactic nuclei (10) complemented by two isolated pulsars (Crab and Vela) and two high-mass X-ray binaries (LS I +61 303 and LS 5039). Two more possible associations have been found: one is 0FGL J1045.6-5937, possibly the counterpart at high energy of the massive colliding wind binary system Eta Carinae, discovered to be a soft gamma ray emitter by recent INTEGRAL observations and 0FGL J1746.0-2900 coincident with IGR J17459-2902, but still not identified with any known object at lower energy. For the remaining 189 Fermi LAT sources no INTEGRAL counterpart was found and we report the 2σ upper limit in the energy band 20-40keV. Description: Recently, INTEGRAL (Winkler et al. 2003A&A...411L...1W) and Swift have been joined in operation by the Fermi gamma-ray satellite launched in 2008 June, providing a coverage of the sky over 10 orders of magnitude in energy, from keV to GeV. Onboard this satellite, the Large Area Telescope (LAT) is an imaging high-energy gamma-ray telescope (20MeV-300GeV). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 72 16 Spatial correlation between Fermi LAT and IBIS sources table2.dat 19 189 2σ upper limit (20-40keV) for the 189 Fermi LAT sources with no IBIS counterpart
See also: J/ApJ/715/429 : First Fermi-LAT AGN catalog (1LAC) (Abdo+, 2010) J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010) J/ApJS/186/1 : The 4th IBIS/ISGRI soft gamma-ray survey catalog (Bird+, 2010) J/A+A/523/A61 : INTEGRAL all-sky survey of hard X-ray sources (Krivonos+, 2010) J/ApJS/183/46 : Fermi/LAT bright gamma-ray source list (0FGL) (Abdo+, 2009) J/A+A/505/417 : Second INTEGRAL AGN catalogue (Beckmann+, 2009) J/ApJ/700/597 : FERMI LAT detected blazars (Abdo+, 2009) J/A+A/484/783 : Spectroscopy of 7 INTEGRAL X-ray sources (Chaty+, 2008) J/A+A/467/585 : Sources detected by ISGRI (Bodaghee+, 2007) J/ApJ/607/L33 : First IBIS Catalog: 20-100keV (Bird+, 2004) J/A+A/411/L59 : INTEGRAL reference catalog (Ebisawa+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- 0FGL Fermi designation (JHHMM.m+DDMM) 14- 20 F7.3 deg RAdeg Right ascension in decimal degrees (J2000) 22- 28 F7.3 deg DEdeg Declination in decimal degrees (J2000) 30- 36 F7.3 deg RAIdeg IBIS right ascension in decimal degrees (J2000) 38- 44 F7.3 deg DEIdeg IBIS declination in decimal degrees (J2000) 46- 50 F5.3 arcmin Dist Distance between Fermi/LAT and IBIS sources (1) 52- 56 F5.3 --- Sep Separation (1) 58- 72 A15 --- Name IBIS identification
Note (1): "Dist" is the distance between the LAT and IBIS source positions while "Sep" is this distance divided the square root of the quadratic sum of their corresponding error radii.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- 0FGL Fermi/LAT designation (JHHMM.m+DDMM) (1) 14- 19 F6.4 mCrab Flux Integral/IBIS 2sigma upper limit flux (2)
Note (1): Of bright sources emitting in the 100MeV-100GeV range (Abdo et al. 2009, Cat. J/ApJ/700/597). Note (2): The fluxes are in milliCrab=7.6e-12erg/cm^2/s in the 20-40keV range.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 28-Dec-2011
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