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Prospettive per GLAST dal cielo INTEGRAL. Pietro Ubertini on behalf of the IBIS Survey Team IASF-Roma, Istituto Nazionale di Astrofisica. Astrofisica Gamma dallo Spazio in Italia: AGILE e GLAST 2 - 3 LUGLIO 2007, ASDC – ESRIN, Frascati. 5 INTEGRAL YEARS FIESTA ESA/INAF/ASI

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Prospettive per GLAST dal cielo INTEGRAL

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prospettive per glast dal cielo integral
Prospettive per GLASTdal cielo INTEGRAL

Pietro Ubertini on behalf of the IBIS Survey Team

IASF-Roma, Istituto Nazionale di Astrofisica

Astrofisica Gamma dallo Spazio in Italia: AGILE e GLAST

2 - 3 LUGLIO 2007, ASDC – ESRIN, Frascati




aperto ai giovani

1-2 Review talk/topic +

Contributed +

Open discussion

No proceedings



Zoom of the Central Radiant of the Galaxy

INTEGRAL/IBIS 3rd survey: Bird et al. 2007, Ap.J.Suppl. 170, 175)


Ricordate il talk di Patrizia? IBIS UGOs cambiano ogni settimana (fortunatamente, maaumentano in valore assoluto!

3rd IBIS/ISGRI soft gamma-ray source catalogue

The catalogue includes 421 sources detected in the energy range 17–100 keV:

41% galactic accreting system

29% extragalactic objects

8% other types

26% not classified i.e. unknown origin

Comparison to previous IBIS/ISGRI surveys:

Increase in AGN number due to a increased exposure away from the GP

Increase of the rate of discovery of HMXB

The percentage of sources without an identification has remained constant

Bird et al. 2007

isgri 3 rd cat versus egret 3 rd cat

ISGRI(3rd Cat) versus EGRET (3rd Cat)

Total Correlations ~ 22 (to 0.7°) of which ~ 8 expected by chance


ISGRI (3rd Cat) versus EGRET (3rd Cat)

+ EGRET positional uncertainty (95% confidence)

Likely associations INTEGRAL/GLAST-AGILE with PWN, microquasars &blazars


INTEGRAL has detected a number of pulsar/ PWN systems; a few have also a TeV counterpart

Crab Nebula

HESS J0835-455 = Vela X

HESS J1514-591=MSH 15-52

unidentified very high energy sources

Hermsen et al., 2006

QSO 0241 +622

3EG J0229+6151

LSI +61 303

3EG J0241+6103

Egret contours

Unidentified (very) high energy sources
  • INTEGRAL deep sky maps are (and will remain) robust and unique to allow detection of yet un-identified very high energy sources fm COS-B, EGRET, GLAST, AGILE, HESS…
    • Persistent = normal pulsars and ms radio pulsars
    • Variable = micro-quasar/pulsar binaries
    • Extragalactic sources (variability studies: gain ~ time, not sqrt(time) )
  • Need typically 10 Ms on plane

Recent example: the Microquasar and TeV/EGRET/ COS-B source LSI +61 303 seen by INTEGRAL


An example of BLAZARS Spectral Energy Distribution



new data


De Rosa et al. 2005

The Spectral Energy Distributions of PKS1830-211 in the observers' frame derived from INTEGRAL and CHANDRA and other published data. Radio measurements are from Pramesh Rao & Subrahmanyan (1988), IR and optical data from Courbin et al. (2002) and gamma-ray data from the EGRET public data archive.

IGR J22517+2218=MG3225155+2217 (z~3.7): most distant AGN so far detected; rest frame Lg (100-500 keV) =5x1048 erg/s

20-100 keV Lum vs z

A new type of High-power HBLs?

P. Giommi talk

swift integral observation of mg3225155 2217
Swift/INTEGRAL Observation of MG3225155+2217
  • IGR J22517+2218is a very interesting object with many peculiar features:
  • it is radio loud with a flat radio spectrum; core dominated radio emission (no extended features)
  • it hosts a narrow line absorption system in optical;
  • it shows a spectral curvature in X-rays either intrinsic or due to high absorption in the source rest frame;
  • it is variable at high energies.

XRT image 2-10 keV

ISGRI mosaic 18-100 keV

Broad band spectrum X/gamma-ray spectrum

Rest frame source SED is also unusual among FSRQ as it is compatible with having the synchrotron peak in the X/gamma-ray band (i.e. much higher than generally observed) or alternatively with the Compton peak in the MeV range (i.e. lower than typically measured).



ISGRI(3rd Cat) versus EGRET (3rd Cat)

Uncertain associations with unidentified EGRET sources

+ EGRET positional uncertainty (95% confidence)


3 EGRET sources in Galactic Center Region (IGR J1736-2908/GRS1734-292,

IGR J1746-2851/1E1742.9-2949, 3EG J1744-3011/1E1740.7-2942)

But remember most ( ~7out of 11 ) are likely to be false associations according to the cross correlation analysis; however a few are true

unclear ibis egret associations

3EG J1734-3232

IGR J17354-3255 (unidentified )

PMN1735-3254( extended radio source)

Variable as seen in survey and also Galactic Bulge Monitoring but not EGRET variable


unclear ibis egret associations1

REV 429

3EG J1744-0310 identified with the z=1.05 QSO B1741-03 but…variable new IBIS source in EGRET error box

IGR J17426-0258 (still unidentified sources detected in Rev 429 )

Which is the counterpart to this EGRET?

Prospects for GLAST (based on a cross correlation IBIS+BAT cat vs EGRETresulting in a total of about 800 sources)

Cygnus Region

  • Expected number of GLAST detections

in INTEGRAL Key Projects (only) ~400

  • If percent of association as with EGRET (~14%)
  • Then ~50 associations possible:

~40 Blazars,

~7 pulsars,

2-3 microquasars

Galactic Center Region