Classifying Intermediate Redshift Galaxies in SDSS: Alternative Diagnostic Diagrams
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866929307056603136 |
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| author | Feuillet, Léa Meléndez, Marcio Kraemer, Steve Schmitt, Henrique Fischer, Travis Reeves, James |
| author_facet | Feuillet, Léa Meléndez, Marcio Kraemer, Steve Schmitt, Henrique Fischer, Travis Reeves, James |
| contents | We select a sample of 1,437 active galactic nuclei (AGN) from the catalog of the Sloan Digital Sky Survey (SDSS) galaxy properties from the Portsmouth group by detection of the high-ionization [Ne V] 3426 Å emission line. We compare the fluxes of [Ne III] 3869 Å, [O III] 5007 Å, [O II] 3726, 3728 Å, and [O I] 6300 Å to that of [Ne V]. All four lines show a strong linear correlation with [Ne V], although lines from ions with lower ionization potentials have a lower correlation coefficient. We investigate the use of two forbidden-line ratio (FLR) diagnostic diagrams that do not rely on H$α$ in order to classify high redshift galaxies. These use the [Ne III]/[O II] line ratio plotted against [O III]/[O I] and [O III]/[O II] respectively. We use photo-ionization modeling to characterize the behavior of the narrow-line region in AGN and star-forming regions and test the validity of our diagnostic diagrams. We also use a luminosity cutoff of log L[OIII] [erg/s] = 42, which lowers the contamination of the AGN region by star-forming galaxies down to 10% but does not remove Green Pea and Purple Grape galaxies from the AGN region. We also investigate the OHNO diagram which uses [Ne III]/[O II] plotted against [O III]/H$β$. Using our new diagnostic diagrams, we are able to reliably classify AGN up to a redshift of z $\leq$ 1.06, and add more than 822 new AGN to the [Ne V]-selected AGN sample. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_17381 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Classifying Intermediate Redshift Galaxies in SDSS: Alternative Diagnostic Diagrams Feuillet, Léa Meléndez, Marcio Kraemer, Steve Schmitt, Henrique Fischer, Travis Reeves, James Astrophysics of Galaxies We select a sample of 1,437 active galactic nuclei (AGN) from the catalog of the Sloan Digital Sky Survey (SDSS) galaxy properties from the Portsmouth group by detection of the high-ionization [Ne V] 3426 Å emission line. We compare the fluxes of [Ne III] 3869 Å, [O III] 5007 Å, [O II] 3726, 3728 Å, and [O I] 6300 Å to that of [Ne V]. All four lines show a strong linear correlation with [Ne V], although lines from ions with lower ionization potentials have a lower correlation coefficient. We investigate the use of two forbidden-line ratio (FLR) diagnostic diagrams that do not rely on H$α$ in order to classify high redshift galaxies. These use the [Ne III]/[O II] line ratio plotted against [O III]/[O I] and [O III]/[O II] respectively. We use photo-ionization modeling to characterize the behavior of the narrow-line region in AGN and star-forming regions and test the validity of our diagnostic diagrams. We also use a luminosity cutoff of log L[OIII] [erg/s] = 42, which lowers the contamination of the AGN region by star-forming galaxies down to 10% but does not remove Green Pea and Purple Grape galaxies from the AGN region. We also investigate the OHNO diagram which uses [Ne III]/[O II] plotted against [O III]/H$β$. Using our new diagnostic diagrams, we are able to reliably classify AGN up to a redshift of z $\leq$ 1.06, and add more than 822 new AGN to the [Ne V]-selected AGN sample. |
| title | Classifying Intermediate Redshift Galaxies in SDSS: Alternative Diagnostic Diagrams |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2312.17381 |