Galaxy emission line classification using three-dimensional line ratio diagrams
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Vogt, Frederic; Dopita, Michael; Kewley, Lisa; Sutherland, Ralph; Scharwachter, Julia; Basurah, Hassan; Ali, Alaa; Amer, Morsi A.
Description
Two-dimensional (2D) line ratio diagnostic diagrams have become a key tool in understanding the excitation mechanisms of galaxies. The curves used to separate the different regions - H II-like or excited by an active galactic nucleus (AGN) - have been refined over time but the core technique has not evolved significantly. However, the classification of galaxies based on their emission line ratios really is a multi-dimensional problem. Here we exploit recent software developments to explore the...[Show more]
dc.contributor.author | Vogt, Frederic | |
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dc.contributor.author | Dopita, Michael | |
dc.contributor.author | Kewley, Lisa | |
dc.contributor.author | Sutherland, Ralph | |
dc.contributor.author | Scharwachter, Julia | |
dc.contributor.author | Basurah, Hassan | |
dc.contributor.author | Ali, Alaa | |
dc.contributor.author | Amer, Morsi A. | |
dc.date.accessioned | 2015-12-13T22:32:10Z | |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/1885/75456 | |
dc.description.abstract | Two-dimensional (2D) line ratio diagnostic diagrams have become a key tool in understanding the excitation mechanisms of galaxies. The curves used to separate the different regions - H II-like or excited by an active galactic nucleus (AGN) - have been refined over time but the core technique has not evolved significantly. However, the classification of galaxies based on their emission line ratios really is a multi-dimensional problem. Here we exploit recent software developments to explore the potential of three-dimensional (3D) line ratio diagnostic diagrams. We introduce the diagrams, which are a specific set of 3D diagrams that separate the oxygen abundance and the ionization parameter of H II region-like spectra and also enable us to probe the excitation mechanism of the gas. By examining these new 3D spaces interactively, we define the diagnostics, a new set of 2D diagnostics that can provide the metallicity of objects excited by hot young stars and that cleanly separate H II region-like objects from the different classes of AGNs. We show that these diagnostics are consistent with the key log [N II]/Hα versus log [O III]/Hβ diagnostic currently used by the community. They also have the advantage of attaching a probability that a given object belongs to one class or the other. Finally, we discuss briefly why diagrams can provide a new way to differentiate and study the different classes of AGNs in anticipation of a dedicated follow-up study. | |
dc.publisher | IOP Publishing | |
dc.rights | Author/s retain copyright | |
dc.source | Astrophysical Journal, The | |
dc.title | Galaxy emission line classification using three-dimensional line ratio diagrams | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 793 | |
dc.date.issued | 2014 | |
local.identifier.absfor | 020110 - Stellar Astronomy and Planetary Systems | |
local.identifier.absfor | 020100 - ASTRONOMICAL AND SPACE SCIENCES | |
local.identifier.ariespublication | U3488905xPUB4626 | |
local.type.status | Published Version | |
local.contributor.affiliation | Vogt, Frederic, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Dopita, Michael, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Kewley, Lisa, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Sutherland, Ralph, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Scharwachter, Julia, Observatoire de Paris | |
local.contributor.affiliation | Basurah, Hassan, King Abdulaziz University | |
local.contributor.affiliation | Ali, Alaa, King Abdulaziz University | |
local.contributor.affiliation | Amer, Morsi A., King Abdulaziz University | |
local.bibliographicCitation.issue | 2 | |
local.bibliographicCitation.startpage | 1 | |
local.bibliographicCitation.lastpage | 19 | |
local.identifier.doi | 10.1088/0004-637X/793/2/127 | |
dc.date.updated | 2015-12-11T09:05:23Z | |
local.identifier.scopusID | 2-s2.0-84907204605 | |
local.identifier.thomsonID | 000341965300058 | |
dcterms.accessRights | Open Access | |
Collections | ANU Research Publications |
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