Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/30703
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Matsuoka, K. | en_US |
dc.contributor.author | Nagao, T. | en_US |
dc.contributor.author | Marconi, Alessandro | en_US |
dc.contributor.author | Maiolino, R. | en_US |
dc.contributor.author | MANNUCCI, FILIPPO | en_US |
dc.contributor.author | CRESCI, GIOVANNI | en_US |
dc.contributor.author | Terao, K. | en_US |
dc.contributor.author | Ikeda, H. | en_US |
dc.date.accessioned | 2021-03-15T12:25:12Z | - |
dc.date.available | 2021-03-15T12:25:12Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/30703 | - |
dc.description.abstract | The mass-metallicity relation (MZR) of type-2 active galactic nuclei (AGNs) at 1.2 < z < 4.0 is investigated by using high-z radio galaxies (HzRGs) and X-ray selected radio-quiet AGNs. We combine new rest-frame ultraviolet (UV) spectra of two radio-quiet type-2 AGNs obtained with FOCAS on the Subaru Telescope with existing rest-frame UV emission lines, i.e., C IVλ1549, He IIλ1640, and C IIIλ1909, of a sample of 16 HzRGs and 6 additional X-ray selected type-2 AGNs, whose host stellar masses have been estimated in literature. We divided our sample in three stellar mass bins and calculated averaged emission-line flux ratios of C IVλ1549/He IIλ1640 and C IIIλ1909/C IVλ1549. Comparing observed emission-line flux ratios with photoionization model predictions, we estimated narrow line region (NLR) metallicities for each mass bin. We found that there is a positive correlation between NLR metallicities and stellar masses of type-2 AGNs at z 3. This is the first indication that AGN metallicities are related to their hosts, i.e., stellar mass. Since NLR metallicities and stellar masses follow a similar relation as the MZR in star-forming galaxies at similar redshifts, our results indicate that NLR metallicities are related to those of the host galaxies. This study highlights the importance of considering lower-mass X-ray selected AGNs in addition to radio galaxies to explore the metallicity properties of NLRs at high redshift. | en_US |
dc.language.iso | eng | en_US |
dc.title | The mass-metallicity relation of high-z type-2 active galactic nuclei | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201833418 | en_US |
dc.identifier.scopus | 2-s2.0-85051962912 | en_US |
dc.identifier.isi | 000441816900003 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2018/08/aa33418-18/aa33418-18.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 616 | en_US |
dc.relation.firstpage | L4 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2018A&A...616L...4M | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0002-9889-4238 | - |
crisitem.author.orcid | 0000-0002-4803-2381 | - |
crisitem.author.orcid | 0000-0002-5281-1417 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
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