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Figure 1: The raw Number-Flux relationship for the sources in the 1st INTEGRAL/IBIS survey. The curves shown are for, All Galactic Sources; LMXB's, HMXB's and the unclassified sources. |
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Figure 2: The area of sky observed in the survey as a function of the minimum detectable flux (6 sigma). The flux is in equivalent Crab units. |
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Figure 3: The Number-Flux relationships as shown in Fig. 1 but corrected for exposure and sky area observed. |
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Figure 4:
A histogram of the absolute distance of unclassified sources
away from the galactic centre perpendicular to the line of
sight (assuming they are ![]() |
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Figure 5: The galactic distribution of sources in the 1st IBIS/ISGRI catalogue. Filled circles represent HMXBs; open circles represent LMXBs; triangles represent unclassified INTEGRAL sources. Overlaid are contours of exposure time, 50, 200 and 700 ks. |
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Figure 6: The Galactic longitude distribution of HMXBs, LMXBs and unclassified sources. Labelled are the locations of the spiral arm tangents: a) - Sagittarius; b) - Scutum; c) - 3-kpc; d) - Norma; e) - Centaurus. |
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Figure 7: Angular distribution of sources away from the Galactic Plane. Note that the number of LMXBs is divided by 2. |
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Figure 8: The galactic distribution of the subset of HMXBs (filled circles) and LMXBs (open circles) for which distance estimates are available in the literature. The Sun is represented by the star symbol and is 8 kpc away from the galactic centre. Superimposed is the 4-arm sprial model of Vallée (2002). Source distance errors are on average of the order of a kpc. |
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Figure 9: The distribution of the height off the plane of: a) HMXBs; b) LMXBs; c) unclassified sources. The dashed lines represent exponential fits. |
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Figure 10: The 20-100 keV luminosity functions of: a) LMXBs; b) HMXBs; c) unclassified sources. The thin line represents the uncorrected luminosty function. The thick line represents the corrected luminosity function as described in the text. The unclassified sources are uncorrected as their source population is undetermined. |
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Figure 11: The 20-100 keV luminosity functions of the IBIS/ISGRI sources separated according to the nature of the compact object: a) black holes; b) neutron stars. The thin line represents the uncorrected luminosty function. The thick line represents the corrected luminosity function as described in the text. |
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