Deep spectroscopy of z~1 6C radio galaxies - II. Breaking the redshift-radio power degeneracy
The results of a spectroscopic analysis of 3CR and 6C radio galaxies at redshift z~1 are contrasted with the properties of lower redshift radio galaxies, chosen to be matched in radio luminosity to the 6C sources studied at z~1, thus enabling the P-z degeneracy to be broken. Partial rank correlation...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2002
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| _version_ | 1797059089257201664 |
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| author | Inskip, K Best, P Rottgering, H Rawlings, S Cotter, G Longair, MS |
| author_facet | Inskip, K Best, P Rottgering, H Rawlings, S Cotter, G Longair, MS |
| author_sort | Inskip, K |
| collection | OXFORD |
| description | The results of a spectroscopic analysis of 3CR and 6C radio galaxies at redshift z~1 are contrasted with the properties of lower redshift radio galaxies, chosen to be matched in radio luminosity to the 6C sources studied at z~1, thus enabling the P-z degeneracy to be broken. Partial rank correlations and principal component analysis have been used to determine which of z and P are the critical parameters underlying the observed variation of the ionization state andd kinematics of the emission line gas. [OII]/H-beta is shown to be a useful ionization mechanism diagnostic. Statistical analysis of the data shows that the ionization state of the emission line gas is strongly correlated with radio power, once the effects of other parameters are removed. No dependence of ionization state on z is observed, implying that the ionization state of the emission line gas is solely a function of the AGN properties rather than the hostt galaxy and/or environment. Statistical analysis of the kinematic properties of the emission line gas shows that these are strongly correlated independently withh both P and z. The correlation with redshift is the stronger of the two, suggesting that host galaxy composition or environment may play a role in producing the less extreme gas kinematics observed in the emission line regions of low redshift galaxies. For both the ionization and kinematic properties of thee galaxies, the independent correlations observed with radio size are strongest. Radio source age is a determining factor for the extended emission line regions. |
| first_indexed | 2024-03-06T19:59:19Z |
| format | Journal article |
| id | oxford-uuid:26b8abeb-f700-4214-b694-520745574ea7 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:59:19Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | oxford-uuid:26b8abeb-f700-4214-b694-520745574ea72022-03-26T12:02:43ZDeep spectroscopy of z~1 6C radio galaxies - II. Breaking the redshift-radio power degeneracyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:26b8abeb-f700-4214-b694-520745574ea7EnglishSymplectic Elements at Oxford2002Inskip, KBest, PRottgering, HRawlings, SCotter, GLongair, MSThe results of a spectroscopic analysis of 3CR and 6C radio galaxies at redshift z~1 are contrasted with the properties of lower redshift radio galaxies, chosen to be matched in radio luminosity to the 6C sources studied at z~1, thus enabling the P-z degeneracy to be broken. Partial rank correlations and principal component analysis have been used to determine which of z and P are the critical parameters underlying the observed variation of the ionization state andd kinematics of the emission line gas. [OII]/H-beta is shown to be a useful ionization mechanism diagnostic. Statistical analysis of the data shows that the ionization state of the emission line gas is strongly correlated with radio power, once the effects of other parameters are removed. No dependence of ionization state on z is observed, implying that the ionization state of the emission line gas is solely a function of the AGN properties rather than the hostt galaxy and/or environment. Statistical analysis of the kinematic properties of the emission line gas shows that these are strongly correlated independently withh both P and z. The correlation with redshift is the stronger of the two, suggesting that host galaxy composition or environment may play a role in producing the less extreme gas kinematics observed in the emission line regions of low redshift galaxies. For both the ionization and kinematic properties of thee galaxies, the independent correlations observed with radio size are strongest. Radio source age is a determining factor for the extended emission line regions. |
| spellingShingle | Inskip, K Best, P Rottgering, H Rawlings, S Cotter, G Longair, MS Deep spectroscopy of z~1 6C radio galaxies - II. Breaking the redshift-radio power degeneracy |
| title | Deep spectroscopy of z~1 6C radio galaxies - II. Breaking the
redshift-radio power degeneracy |
| title_full | Deep spectroscopy of z~1 6C radio galaxies - II. Breaking the
redshift-radio power degeneracy |
| title_fullStr | Deep spectroscopy of z~1 6C radio galaxies - II. Breaking the
redshift-radio power degeneracy |
| title_full_unstemmed | Deep spectroscopy of z~1 6C radio galaxies - II. Breaking the
redshift-radio power degeneracy |
| title_short | Deep spectroscopy of z~1 6C radio galaxies - II. Breaking the
redshift-radio power degeneracy |
| title_sort | deep spectroscopy of z 1 6c radio galaxies ii breaking the redshift radio power degeneracy |
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