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J/A+A/458/245    Obs. of 2 Unidentified Gamma-ray Sources  (La Palombara+, 2006)

XMM-Newton and ESO observations of the two Unidentified Gamma-ray Sources 3EG J0616-3310 and 3EG J1249-8330. La Palombara N., Mignani R.P., Hatziminaoglou E., Schirmer M., Bignami G.F., Caraveo P. <Astron. Astrophys. 458, 245 (2006)> =2006A&A...458..245L
ADC_Keywords: Gamma rays ; X-ray sources ; Pulsars Keywords: stars: neutron - gamma-rays: observations - X-rays: general, surveys, catalogues Abstract: The systematic X-ray and optical coverage of low-latitude unidentified gamma-ray sources, aiming at sources with high X-ray/optical flux ratio, seems one of the most promising ways to spot INS candidate counterparts. We have focussed on two middle-latitude, probably galactic, EGRET sources: 3EG J0616-3310 and 3EG J1249-8330. Here we report on X-ray observations of the two gamma-ray error boxes performed with XMM-Newton and on their optical follow-up carried on with the Wide Field Imager at the ESO/MPG 2.2m telescope. Less than half of the ∼300 sources detected by the X-ray coverage have no optical counterparts. Among those, we have selected few interesting sources with fX/fopt>100, which we consider promising INS candidates. Description: We present the finding charts of the nine most interesting X-ray sources, which have no candidate optical counterpart within 5arcsec and are characterized by a high X-ray/optical flux ratio (i.e. greater than 100). Moreover, we report Appendixes A and B of the paper. In Appendix A we describe the source classification scheme, which is based on the X-ray/optical flux ratio and is derived from the Hamburg/RASS one, taking into account the different energy ranges of ROSAT and XMM-Newton, the different spectral models and the different optical filters. In Appendix B we describe how we calculated the fluxes, based on the optical magnitudes. Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 06 16 36.0 -33 10 12 3EG J0616-3310 12 24 54.4 -83 13 10 3EG J1249-8330 ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 70 8 Main characteristics of the 8 EPIC observations of 3EG J0616-3310 (Obs=1-4) & 3EG J1249-8330 (Obs=5-8) table7.dat 96 9 Main characteristics of the X-ray sources with no candidate optical counterpart and log(FX/Fopt)≳2 appendix.ps 81 7126 PostScript version of Appendix chart.pdf 512 95 PDF version of figure 1
See also: I/239 : The Hipparcos Main Catalogue (ESA, 1997) VII/206 : General Photometry of Galaxies (Prugniel+, 1998) VII/248 : Quasars and Active Galactic Nuclei (12th Ed.) (Veron+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 I1 --- Obs EPIC field sequential reference number 3- 5 I3 --- Rev Revolution number of XMM 7- 16 A10 "YYYY-MM-DD" ObsDate Observation date 18- 25 A8 "h:m:s" ObsTime Observation time (hh:mm:ss) 27- 28 I2 h RAh Right ascension (J2000) 30- 31 I2 min RAm Right ascension (J2000) 33- 36 F4.1 s RAs Right ascension (J2000) 38 A1 --- DE- Declination sign (J2000) 39- 40 I2 deg DEd Declination (J2000) 42- 43 I2 arcmin DEm Declination (J2000) 45- 48 F4.1 arcsec DEs Declination (J2000) 50- 52 F3.1 ks PN Exposure time for PN instrument 54- 57 F4.1 ks MOS1 Exposure time for MOS1 instrument 59- 62 F4.1 ks MOS2 Exposure time for MOS2 instrument 64- 67 F4.1 10+20cm-2 NH Hydrogen column density 69- 70 I2 --- Det Number of detected sources
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1 I1 --- Obs EPIC field sequential reference number 3- 6 A4 --- --- [XMMU] 8- 23 A16 --- XMMU XMMU designation (JHHMMSS.s+DDMMSS) 25- 47 A23 --- Bands Detection bands 49- 50 A2 --- l_kTbt [<≥ ] Limit flag on kTbt 51- 53 F3.1 keV kTbt Range of possible kT temperature for thermal bremsstrahlung spectrum 54 A1 --- --- [-] 55 I1 keV kTbt2 ? Range of possible kT temperature for thermal bremsstrahlung spectrum 57- 58 A2 --- l_kTbb [<≥ ] Limit flag on kTbb 59- 61 F3.1 keV kTbb Range of possible kT temperature for thermal blackbody spectrum 62 A1 --- --- [-] 63- 65 F3.1 keV kTbb2 ? Range of possible kT temperature for thermal blackbody spectrum 67- 68 A2 --- l_Gamma [<≥ ] Limit flag on Gamma 69- 71 F3.1 keV Gamma Range of photon index for a power law spectrum 72 A1 --- --- [-] 73- 75 F3.1 keV Gamma2 ? Range of photon index for a power law spectrum 77- 81 F5.2 10-17W/m2 Flux Source flux in 0.3-10keV energy range 83- 86 F4.2 10-17W/m2 e_Flux rms uncertainty on Flux 88- 91 F4.2 [-] log(FX/Fopt) Lower limit of X-ray-to-optical flux ratio 93- 96 F4.2 [-] e_log(FX/Fopt) rms uncertainty on log(FX/Fopt)
Acknowledgements: Nicola La Palombara, nicola(at)iasf-milano.inaf.it
(End) Patricia Vannier [CDS] 12-Oct-2006
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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