Determination of X-ray flux uncertainty from simulated spectra | Juan Facundo Albacete-Colombo (Univ. of Cornahue Belgrano, Viedma – Argentina)

X-ray sources with very few counts can be identified with low-noise in X-ray detectors, especially for the Advanced CCD Imaging Spectrometer (ACIS-I) camera on board the Chandra X-ray Observatory. Most of these studies concerns to the large populations of faint X-ray sources associated with pre- main sequence stars (PMS). Several of these sources seems to be faint enough for parametric spectral modeling, even in case of simple thermal models. On last years, some attempts were performed to estimates the intrinsic broadband X-ray fluxes and absorption from gas along the line of sight to these sources. However, the relationship between absorption (NH), temperatures (kT), intrinsic flux (F) and their respective errors, with the source count statistic, are unknown. Here, based on an extensive set of X-ray spectral simulations (~80000), we present the relationship between these quantities in terms of the source counts, as well as, the flux error estimation in terms of NH, kT ans photon statistic of the sources. In perspective, this study can offer a precise tool for better tailored observational proposals.