Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/29933
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | CAPETTI, Alessandro | en_US |
dc.contributor.author | Ranieri D. Baldi | en_US |
dc.contributor.author | BRIENZA, MARISA | en_US |
dc.contributor.author | MORGANTI, RAFFAELLA | en_US |
dc.contributor.author | Gabriele Giovannini | en_US |
dc.date.accessioned | 2021-01-21T18:57:20Z | - |
dc.date.available | 2021-01-21T18:57:20Z | - |
dc.date.issued | 2019 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/29933 | - |
dc.description.abstract | Using the Alternative Data Release of the TIFR GMRT Sky Survey (TGSS), we studied the low-frequency properties of FR0 radio galaxies, the large population of compact radio sources associated with red massive early-type galaxies revealed by surveys at 1.4 GHz. We considered TGSS observations from FR0CAT, a sample formed by 104 FR0s at z<0.05: all but one of them are covered by the TGSS, and 43 of them are detected above a 5 sigma limit of 17.5 mJy. No extended emission has been detected around the FR0s, corresponding to a luminosity limit of < 4 10^23 W/Hz over an area of 100 kpc x 100 kpc. All but eight FR0s have a flat or inverted spectral shape (alpha < 0.5) between 150 MHz and 1.4 GHz: this spectral behavior confirms the general paucity of optically thin extended emission within the TGSS beam, as is expected for their compact 1.4 GHz morphology. Data at 5 GHz were used to build their radio spectra, which are also generally flat at higher frequencies. By focusing on a sub-sample of FR0s with flux density > 50 mJy at 1.4 GHz, we found that ~75% of them have a convex spectrum, but with a smaller curvature than the more powerful gigahertz peaked-spectrum sources (GPS). The typical FR0s radio spectrum is better described by a gradual steepening toward high frequencies, rather than to a transition from an optically-thick to an optically-thin regime, possibly observed in only ~15% of the sample. | en_US |
dc.language.iso | eng | en_US |
dc.title | The low-frequency properties of FR0 radio galaxies | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201936254 | en_US |
dc.identifier.scopus | 2-s2.0-85075861414 | en_US |
dc.identifier.isi | 000515103800001 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2019/11/aa36254-19/aa36254-19.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 631 | en_US |
dc.relation.firstpage | A176 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 5 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | 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 | 2019A&A...631A.176C | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems | 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. Torino | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0003-3684-4275 | - |
crisitem.author.orcid | 0000-0003-4120-9970 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
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aa36254-19.pdf | PDF editoriale | 304.5 kB | Adobe PDF | Visualizza/apri |
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