The AGN, star-forming, and morphological properties of luminous ir-bright/optically-faint galaxies
We present the active galactic nucleus (AGN), star-forming, and morphological properties of a sample of 13 MIR-luminous (∫_24 700 μJy) IR-bright/optically-faint galaxies (IRBGs, ∫_24/f_R≲ 1000). While these z ∼ 2 sources were drawn from deep Chandra fields with >200 ks X-ray coverage, only seven...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2010 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/45102 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/45102 |
| Access Level: | acceso abierto |
| Palabra clave: | 52 Ultraluminous infrared galaxies Active galactic nuclei Deep-field-North Spitzer midinfrared spectroscopy Dust-obscured galaxies Similar-to 2 Polycyclic aromatic-hydrocarbon Redshift submillimeter galaxies Supermassive black-holes Point-source catalogs Astrofísica Astronomía (Física) |
| id |
ES_2d1c01406e07bbbfec5a72effb8c11d3 |
|---|---|
| oai_identifier_str |
oai:docta.ucm.es:20.500.14352/45102 |
| network_acronym_str |
ES |
| network_name_str |
España |
| repository_id_str |
|
| spelling |
The AGN, star-forming, and morphological properties of luminous ir-bright/optically-faint galaxiesDonley, J. L.Rieke, G. H.Alexander, D. M.Egami, E.Pérez González, Pablo Guillermo52Ultraluminous infrared galaxiesActive galactic nucleiDeep-field-NorthSpitzer midinfrared spectroscopyDust-obscured galaxiesSimilar-to 2Polycyclic aromatic-hydrocarbonRedshift submillimeter galaxiesSupermassive black-holesPoint-source catalogsAstrofísicaAstronomía (Física)We present the active galactic nucleus (AGN), star-forming, and morphological properties of a sample of 13 MIR-luminous (∫_24 700 μJy) IR-bright/optically-faint galaxies (IRBGs, ∫_24/f_R≲ 1000). While these z ∼ 2 sources were drawn from deep Chandra fields with >200 ks X-ray coverage, only seven are formally detected in the X-ray and four lack X-ray emission at even the 2σ level. Spitzer InfraRed Spectrograph (IRS) spectra, however, confirm that all of the sources are AGN-dominated in the mid-IR, although half have detectable polycyclic aromatic hydrocarbon (PAH) emission responsible for ∼25% of their mid-infrared flux density. When combined with other samples, this indicates that at least 30%–40% of luminous IRBGs have star formation rates in the ultraluminous infrared galaxy (ULIRG) range (∼100–2000 M_⨀ yr^−1). X-ray hardness ratios and MIR to X-ray luminosity ratios indicate that all members of the sample contain heavily X-ray obscured AGNs, 80% of which are candidates to be Compton thick. Furthermore, the mean X-ray luminosity of the sample, log L_2–10 keV(erg s^−1) ∼44.6, indicates that these IRBGs are Type 2 QSOs, at least from the X-ray perspective. While those sources most heavily obscured in the X-ray are also those most likely to display strong silicate absorption in the mid-IR, silicate absorption does not always accompany X-ray obscuration. Finally, ∼70% of the IRBGs are merger candidates, a rate consistent with that of sub-mm galaxies (SMGs), although SMGs appear to be physically larger than IRBGs. These characteristics are consistent with the proposal that these objects represent a later, AGN-dominated, and more relaxed evolutionary stage following soon after the star-formation-dominated one represented by the SMGs.American Astronomical SocietyUniversidad Complutense de Madrid20102010-08-2020102010-08-20journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/45102reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/451022026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
The AGN, star-forming, and morphological properties of luminous ir-bright/optically-faint galaxies |
| title |
The AGN, star-forming, and morphological properties of luminous ir-bright/optically-faint galaxies |
| spellingShingle |
The AGN, star-forming, and morphological properties of luminous ir-bright/optically-faint galaxies Donley, J. L. 52 Ultraluminous infrared galaxies Active galactic nuclei Deep-field-North Spitzer midinfrared spectroscopy Dust-obscured galaxies Similar-to 2 Polycyclic aromatic-hydrocarbon Redshift submillimeter galaxies Supermassive black-holes Point-source catalogs Astrofísica Astronomía (Física) |
| title_short |
The AGN, star-forming, and morphological properties of luminous ir-bright/optically-faint galaxies |
| title_full |
The AGN, star-forming, and morphological properties of luminous ir-bright/optically-faint galaxies |
| title_fullStr |
The AGN, star-forming, and morphological properties of luminous ir-bright/optically-faint galaxies |
| title_full_unstemmed |
The AGN, star-forming, and morphological properties of luminous ir-bright/optically-faint galaxies |
| title_sort |
The AGN, star-forming, and morphological properties of luminous ir-bright/optically-faint galaxies |
| dc.creator.none.fl_str_mv |
Donley, J. L. Rieke, G. H. Alexander, D. M. Egami, E. Pérez González, Pablo Guillermo |
| author |
Donley, J. L. |
| author_facet |
Donley, J. L. Rieke, G. H. Alexander, D. M. Egami, E. Pérez González, Pablo Guillermo |
| author_role |
author |
| author2 |
Rieke, G. H. Alexander, D. M. Egami, E. Pérez González, Pablo Guillermo |
| author2_role |
author author author author |
| dc.contributor.none.fl_str_mv |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
52 Ultraluminous infrared galaxies Active galactic nuclei Deep-field-North Spitzer midinfrared spectroscopy Dust-obscured galaxies Similar-to 2 Polycyclic aromatic-hydrocarbon Redshift submillimeter galaxies Supermassive black-holes Point-source catalogs Astrofísica Astronomía (Física) |
| topic |
52 Ultraluminous infrared galaxies Active galactic nuclei Deep-field-North Spitzer midinfrared spectroscopy Dust-obscured galaxies Similar-to 2 Polycyclic aromatic-hydrocarbon Redshift submillimeter galaxies Supermassive black-holes Point-source catalogs Astrofísica Astronomía (Física) |
| description |
We present the active galactic nucleus (AGN), star-forming, and morphological properties of a sample of 13 MIR-luminous (∫_24 700 μJy) IR-bright/optically-faint galaxies (IRBGs, ∫_24/f_R≲ 1000). While these z ∼ 2 sources were drawn from deep Chandra fields with >200 ks X-ray coverage, only seven are formally detected in the X-ray and four lack X-ray emission at even the 2σ level. Spitzer InfraRed Spectrograph (IRS) spectra, however, confirm that all of the sources are AGN-dominated in the mid-IR, although half have detectable polycyclic aromatic hydrocarbon (PAH) emission responsible for ∼25% of their mid-infrared flux density. When combined with other samples, this indicates that at least 30%–40% of luminous IRBGs have star formation rates in the ultraluminous infrared galaxy (ULIRG) range (∼100–2000 M_⨀ yr^−1). X-ray hardness ratios and MIR to X-ray luminosity ratios indicate that all members of the sample contain heavily X-ray obscured AGNs, 80% of which are candidates to be Compton thick. Furthermore, the mean X-ray luminosity of the sample, log L_2–10 keV(erg s^−1) ∼44.6, indicates that these IRBGs are Type 2 QSOs, at least from the X-ray perspective. While those sources most heavily obscured in the X-ray are also those most likely to display strong silicate absorption in the mid-IR, silicate absorption does not always accompany X-ray obscuration. Finally, ∼70% of the IRBGs are merger candidates, a rate consistent with that of sub-mm galaxies (SMGs), although SMGs appear to be physically larger than IRBGs. These characteristics are consistent with the proposal that these objects represent a later, AGN-dominated, and more relaxed evolutionary stage following soon after the star-formation-dominated one represented by the SMGs. |
| publishDate |
2010 |
| dc.date.none.fl_str_mv |
2010 2010-08-20 2010 2010-08-20 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/20.500.14352/45102 |
| url |
https://hdl.handle.net/20.500.14352/45102 |
| 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 |
| 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 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
American Astronomical Society |
| publisher.none.fl_str_mv |
American Astronomical Society |
| dc.source.none.fl_str_mv |
reponame:Docta Complutense instname:Universidad Complutense de Madrid (UCM) |
| instname_str |
Universidad Complutense de Madrid (UCM) |
| reponame_str |
Docta Complutense |
| collection |
Docta Complutense |
| repository.name.fl_str_mv |
|
| repository.mail.fl_str_mv |
|
| _version_ |
1869405287489732608 |
| score |
15.300719 |