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dc.contributor.author
Albacete Colombo, Juan Facundo
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dc.contributor.author
Flaccomio, E.
dc.contributor.author
Drake, J. J.
dc.contributor.author
Wright, N. J.
dc.contributor.author
Guarcello, M.
dc.contributor.author
Kashyap, V.
dc.date.available
2024-04-08T12:53:15Z
dc.date.issued
2023-10
dc.identifier.citation
Albacete Colombo, Juan Facundo; Flaccomio, E.; Drake, J. J.; Wright, N. J.; Guarcello, M.; et al.; The Statistical Uncertainties on X-Ray Flux and Spectral Parameters from Chandra ACIS-I Observations of Faint Sources: Application to the Cygnus OB2 Association; IOP Publishing; Astrophysical Journal Supplement Series; 269; 1; 10-2023; 1-18
dc.identifier.issn
0067-0049
dc.identifier.uri
http://hdl.handle.net/11336/232317
dc.description.abstract
We investigate the uncertainties of fitted X-ray model parameters and fluxes for relatively faint Chandra ACIS-I source spectra. Monte Carlo (MC) simulations are employed to construct a large set of 150,000 fake X-ray spectra in the low photon count statistics regime (from 10 to 350 net counts) using the XSPEC spectral model-fitting package. The simulations employed both absorbed thermal (APEC) and nonthermal (power-law) models, in concert with the Chandra ACIS-I instrument response and interstellar absorption. Simulated X-ray spectra were fit assuming a wide set of different input parameters and C-statistic minimization criteria to avoid numerical artifacts in the accepted solutions. Results provide an error estimate for each parameter (absorption, NH, plasma temperature, kT, or power-law slope, Γ, and flux) and for different background contamination levels. The distributions of these errors are studied as a function of the 1σ quantiles, and we show how these correlate with different model parameters, net counts in the spectra, and relative background levels. Maps of uncertainty in terms of the 1σ quantiles for parameters and flux are computed as a function of spectrum net counts. We find very good agreement between our estimated X-ray spectral parameter and flux uncertainties and those recovered from spectral fitting for a subset of the X-ray sources detected in the Chandra Cygnus OB2 Legacy Survey diagnosed to be association members and that have between 20 and 350 net counts. Our method can provide uncertainties for spectral parameters whenever formal X-ray spectral fits cannot be well constrained, or are unavailable, and predictions are useful for computing Chandra ACIS-I exposure times for observation planning.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Computational methods
dc.subject
Astronomical methods
dc.subject
X-ray sources
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
The Statistical Uncertainties on X-Ray Flux and Spectral Parameters from Chandra ACIS-I Observations of Faint Sources: Application to the Cygnus OB2 Association
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-04-08T11:13:06Z
dc.journal.volume
269
dc.journal.number
1
dc.journal.pagination
1-18
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Albacete Colombo, Juan Facundo. Universidad Nacional de Rio Negro. Sede Atlantica. Departamento de Investigación en Ciencias Exactas, Naturales y de Ingenieria; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia; Argentina
dc.description.fil
Fil: Flaccomio, E.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; Italia
dc.description.fil
Fil: Drake, J. J.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil
Fil: Wright, N. J.. Keele University.; Reino Unido
dc.description.fil
Fil: Guarcello, M.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; Italia
dc.description.fil
Fil: Kashyap, V.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.journal.title
Astrophysical Journal Supplement Series
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4365/acdd69
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3847/1538-4365/acdd69
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