The role of the synchrotron component in the mid-infrared spectrum of M 87

We study in detail the mid-infrared (MIR) Spitzer-IRS spectrum of M 87 in the range 5–20 μm. Thanks to the high sensitivity of our Spitzer-IRS spectra we can disentangle the stellar and nuclear components of this active galaxy. To this end, we have properly subtracted from the M 87 spectrum the cont...

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Main Authors: JOSE RAMON VALDES PARRA, MIGUEL Y ROSA MARIA CHAVEZ DAGOSTINO
Format: info:eu-repo/semantics/article
Language:eng
Published: The Astrophysical Journal 2009
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Online Access:http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1283
id inaoe1009-1283
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spelling inaoe1009-12832018-08-23T19:31:06Z The role of the synchrotron component in the mid-infrared spectrum of M 87 JOSE RAMON VALDES PARRA MIGUEL Y ROSA MARIA CHAVEZ DAGOSTINO The Astrophysical Journal 2009 info:eu-repo/semantics/article We study in detail the mid-infrared (MIR) Spitzer-IRS spectrum of M 87 in the range 5–20 μm. Thanks to the high sensitivity of our Spitzer-IRS spectra we can disentangle the stellar and nuclear components of this active galaxy. To this end, we have properly subtracted from the M 87 spectrum the contribution of the underlying stellar continuum derived from passive Virgo galaxies in our sample. The residual is a clear power law, without any additional termal component, with a zero-point consistent with that obtained by high spatial resolution, ground-based observations. The residual is independent of the adopted passive template. This indicates that the 10 μm silicate emission shown in the spectra of M 87 can be entirely accounted for by the underlying old stellar population, leaving little room for a possible torus contribution. The MIR power law has a slope α ∼0.77–0.82 (Sᵥ ∝ ν exp−α), consistent with optically thin synchrotron emission. students researchers generalPublic info:eu-repo/classification/Inspec/Galaxies: active info:eu-repo/classification/Inspec/Galaxies: elliptical and lenticular, cD info:eu-repo/classification/Inspec/Galaxies: individual (M 87) info:eu-repo/classification/Inspec/Galaxies: jets info:eu-repo/classification/Inspec/Infrared: galaxies info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/21 info:eu-repo/classification/cti/21 http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1283 info:eu-repo/semantics/openAccess eng citation:Buson, L., et al., (2009). The role of the synchrotron component in the mid-infrared spectrum of M 87, The Astrophysical Journal. Vol.705(1):356–360 http://creativecommons.org/licenses/by-nc-nd/4.0 info:eu-repo/semantics/acceptedVersion application/pdf
institution Repositorio INAOE
collection DSpace
language eng
topic info:eu-repo/classification/Inspec/Galaxies: active
info:eu-repo/classification/Inspec/Galaxies: elliptical and lenticular, cD
info:eu-repo/classification/Inspec/Galaxies: individual (M 87)
info:eu-repo/classification/Inspec/Galaxies: jets
info:eu-repo/classification/Inspec/Infrared: galaxies
info:eu-repo/classification/cti/1
info:eu-repo/classification/cti/21
info:eu-repo/classification/cti/21
spellingShingle info:eu-repo/classification/Inspec/Galaxies: active
info:eu-repo/classification/Inspec/Galaxies: elliptical and lenticular, cD
info:eu-repo/classification/Inspec/Galaxies: individual (M 87)
info:eu-repo/classification/Inspec/Galaxies: jets
info:eu-repo/classification/Inspec/Infrared: galaxies
info:eu-repo/classification/cti/1
info:eu-repo/classification/cti/21
info:eu-repo/classification/cti/21
JOSE RAMON VALDES PARRA
MIGUEL Y ROSA MARIA CHAVEZ DAGOSTINO
The role of the synchrotron component in the mid-infrared spectrum of M 87
description We study in detail the mid-infrared (MIR) Spitzer-IRS spectrum of M 87 in the range 5–20 μm. Thanks to the high sensitivity of our Spitzer-IRS spectra we can disentangle the stellar and nuclear components of this active galaxy. To this end, we have properly subtracted from the M 87 spectrum the contribution of the underlying stellar continuum derived from passive Virgo galaxies in our sample. The residual is a clear power law, without any additional termal component, with a zero-point consistent with that obtained by high spatial resolution, ground-based observations. The residual is independent of the adopted passive template. This indicates that the 10 μm silicate emission shown in the spectra of M 87 can be entirely accounted for by the underlying old stellar population, leaving little room for a possible torus contribution. The MIR power law has a slope α ∼0.77–0.82 (Sᵥ ∝ ν exp−α), consistent with optically thin synchrotron emission.
format info:eu-repo/semantics/article
author JOSE RAMON VALDES PARRA
MIGUEL Y ROSA MARIA CHAVEZ DAGOSTINO
author_facet JOSE RAMON VALDES PARRA
MIGUEL Y ROSA MARIA CHAVEZ DAGOSTINO
author_sort JOSE RAMON VALDES PARRA
title The role of the synchrotron component in the mid-infrared spectrum of M 87
title_short The role of the synchrotron component in the mid-infrared spectrum of M 87
title_full The role of the synchrotron component in the mid-infrared spectrum of M 87
title_fullStr The role of the synchrotron component in the mid-infrared spectrum of M 87
title_full_unstemmed The role of the synchrotron component in the mid-infrared spectrum of M 87
title_sort role of the synchrotron component in the mid-infrared spectrum of m 87
publisher The Astrophysical Journal
publishDate 2009
url http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1283
_version_ 1657197852423618560
score 14.09242

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