A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth

Privon, G.C.; Ricci, C.; Aalto, S.; Viti, S.; Armus, L.; Díaz Santos, T.; González Alfonso, Eduardo|||0000-0001-5285-8517; Iwasawa, K.; Jeff, D.L.; Treister, E.; Bauer, F.; Evans, A.S.; Garg, P.; Herrero Illana, R.; Mazzarella, J.; Larson, K.; Blecha, L.; Barcos Muñoz, L.; Charmandaris, V.; Stierwalt, S.; Pérez Torres, M.A.

A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth

Enhanced emission from the dense gas tracer HCN (relative to HCO+) has been proposed as a signature of active galactic nuclei (AGN). In a previous single-dish millimeter line survey we identified galaxies with HCN/HCO+ (1–0) intensity ratios consistent with those of many AGN but whose mid-infrared s...

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Autores:	Privon, G.C., Ricci, C., Aalto, S., Viti, S., Armus, L., Díaz Santos, T., González Alfonso, Eduardo\|\|\|0000-0001-5285-8517, Iwasawa, K., Jeff, D.L., Treister, E., Bauer, F., Evans, A.S., Garg, P., Herrero Illana, R., Mazzarella, J., Larson, K., Blecha, L., Barcos Muñoz, L., Charmandaris, V., Stierwalt, S., Pérez Torres, M.A.
Tipo de recurso:	artículo
Fecha de publicación:	2020
País:	España
Institución:	Universidad de Alcalá (UAH)
Repositorio:	e_Buah Biblioteca Digital Universidad de Alcalá
Idioma:	inglés
OAI Identifier:	oai:ebuah.uah.es:10017/67635
Acceso en línea:	http://hdl.handle.net/10017/67635 https://dx.doi.org/10.3847/1538-4357/ab8015
Access Level:	acceso abierto
Palabra clave:	Astronomía Física Astronomy Physics

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spelling	A hard X-ray test of HCN enhancements as a tracer of embedded black hole growthPrivon, G.C.Ricci, C.Aalto, S.Viti, S.Armus, L.Díaz Santos, T.González Alfonso, Eduardo\|\|\|0000-0001-5285-8517Iwasawa, K.Jeff, D.L.Treister, E.Bauer, F.Evans, A.S.Garg, P.Herrero Illana, R.Mazzarella, J.Larson, K.Blecha, L.Barcos Muñoz, L.Charmandaris, V.Stierwalt, S.Pérez Torres, M.A.AstronomíaFísicaAstronomyPhysicsEnhanced emission from the dense gas tracer HCN (relative to HCO+) has been proposed as a signature of active galactic nuclei (AGN). In a previous single-dish millimeter line survey we identified galaxies with HCN/HCO+ (1–0) intensity ratios consistent with those of many AGN but whose mid-infrared spectral diagnostics are consistent with little to no (≲15%) contribution of an AGN to the bolometric luminosity. To search for putative heavily obscured AGN, we present and analyze NuSTAR hard X-ray (3–79 keV) observations of four such galaxies from the Great Observatories All-sky LIRG Survey. We find no X-ray evidence for AGN in three of the systems and place strong upper limits on the energetic contribution of any heavily obscured ( ) AGN to their bolometric luminosity. The upper limits on the X-ray flux are presently an order of magnitude below what XDR-driven chemistry models predict are necessary to drive HCN enhancements. In a fourth system we find a hard X-ray excess consistent with the presence of an AGN, but contributing only ∼3% of the bolometric luminosity. It is also unclear if the AGN is spatially associated with the HCN enhancement. We further explore the relationship between HCN/HCO+ (for several Jupper levels) and / for a larger sample of systems in the literature. We find no evidence for correlations between the line ratios and the AGN fraction derived from X-rays, indicating that HCN/HCO+ intensity ratios are not driven by the energetic dominance of AGN, nor are they reliable indicators of ongoing supermassive black hole accretion.The American Astronomical Society20202020-04-01journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10017/67635https://dx.doi.org/10.3847/1538-4357/ab8015reponame:e_Buah Biblioteca Digital Universidad de Alcaláinstname:Universidad de Alcalá (UAH)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:ebuah.uah.es:10017/676352026-06-18T11:13:07Z
dc.title.none.fl_str_mv	A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth
title	A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth
spellingShingle	A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth Privon, G.C. Astronomía Física Astronomy Physics
title_short	A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth
title_full	A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth
title_fullStr	A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth
title_full_unstemmed	A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth
title_sort	A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth
dc.creator.none.fl_str_mv	Privon, G.C. Ricci, C. Aalto, S. Viti, S. Armus, L. Díaz Santos, T. González Alfonso, Eduardo\|\|\|0000-0001-5285-8517 Iwasawa, K. Jeff, D.L. Treister, E. Bauer, F. Evans, A.S. Garg, P. Herrero Illana, R. Mazzarella, J. Larson, K. Blecha, L. Barcos Muñoz, L. Charmandaris, V. Stierwalt, S. Pérez Torres, M.A.
author	Privon, G.C.
author_facet	Privon, G.C. Ricci, C. Aalto, S. Viti, S. Armus, L. Díaz Santos, T. González Alfonso, Eduardo\|\|\|0000-0001-5285-8517 Iwasawa, K. Jeff, D.L. Treister, E. Bauer, F. Evans, A.S. Garg, P. Herrero Illana, R. Mazzarella, J. Larson, K. Blecha, L. Barcos Muñoz, L. Charmandaris, V. Stierwalt, S. Pérez Torres, M.A.
author_role	author
author2	Ricci, C. Aalto, S. Viti, S. Armus, L. Díaz Santos, T. González Alfonso, Eduardo\|\|\|0000-0001-5285-8517 Iwasawa, K. Jeff, D.L. Treister, E. Bauer, F. Evans, A.S. Garg, P. Herrero Illana, R. Mazzarella, J. Larson, K. Blecha, L. Barcos Muñoz, L. Charmandaris, V. Stierwalt, S. Pérez Torres, M.A.
author2_role	author author author author author author author author author author author author author author author author author author author author
dc.subject.none.fl_str_mv	Astronomía Física Astronomy Physics
topic	Astronomía Física Astronomy Physics
description	Enhanced emission from the dense gas tracer HCN (relative to HCO+) has been proposed as a signature of active galactic nuclei (AGN). In a previous single-dish millimeter line survey we identified galaxies with HCN/HCO+ (1–0) intensity ratios consistent with those of many AGN but whose mid-infrared spectral diagnostics are consistent with little to no (≲15%) contribution of an AGN to the bolometric luminosity. To search for putative heavily obscured AGN, we present and analyze NuSTAR hard X-ray (3–79 keV) observations of four such galaxies from the Great Observatories All-sky LIRG Survey. We find no X-ray evidence for AGN in three of the systems and place strong upper limits on the energetic contribution of any heavily obscured ( ) AGN to their bolometric luminosity. The upper limits on the X-ray flux are presently an order of magnitude below what XDR-driven chemistry models predict are necessary to drive HCN enhancements. In a fourth system we find a hard X-ray excess consistent with the presence of an AGN, but contributing only ∼3% of the bolometric luminosity. It is also unclear if the AGN is spatially associated with the HCN enhancement. We further explore the relationship between HCN/HCO+ (for several Jupper levels) and / for a larger sample of systems in the literature. We find no evidence for correlations between the line ratios and the AGN fraction derived from X-rays, indicating that HCN/HCO+ intensity ratios are not driven by the energetic dominance of AGN, nor are they reliable indicators of ongoing supermassive black hole accretion.
publishDate	2020
dc.date.none.fl_str_mv	2020 2020-04-01
dc.type.none.fl_str_mv	journal article http://purl.org/coar/resource_type/c_6501 NA http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv	info:eu-repo/semantics/article
format	article
dc.identifier.none.fl_str_mv	http://hdl.handle.net/10017/67635 https://dx.doi.org/10.3847/1538-4357/ab8015
url	http://hdl.handle.net/10017/67635 https://dx.doi.org/10.3847/1538-4357/ab8015
dc.language.none.fl_str_mv	Inglés eng
language_invalid_str_mv	Inglés
language	eng
dc.rights.none.fl_str_mv	open access http://purl.org/coar/access_right/c_abf2 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv	info:eu-repo/semantics/openAccess
rights_invalid_str_mv	open access http://purl.org/coar/access_right/c_abf2 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv	openAccess
dc.format.none.fl_str_mv	application/pdf
dc.publisher.none.fl_str_mv	The American Astronomical Society
publisher.none.fl_str_mv	The American Astronomical Society
dc.source.none.fl_str_mv	reponame:e_Buah Biblioteca Digital Universidad de Alcalá instname:Universidad de Alcalá (UAH)
instname_str	Universidad de Alcalá (UAH)
reponame_str	e_Buah Biblioteca Digital Universidad de Alcalá
collection	e_Buah Biblioteca Digital Universidad de Alcalá
repository.name.fl_str_mv
repository.mail.fl_str_mv
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A hard X-ray test of HCN enhancements as a tracer of embedded black hole growth

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