Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/24464
Titolo: | The HST view of the innermost narrow line region | Autori: | BALMAVERDE, Barbara CAPETTI, Alessandro Moisio, Daria BALDI, RANIERI DIEGO Marconi, Alessandro |
Data pubblicazione: | 2016 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 586 | Da pagina:: | A48 | Abstract: | We analyze the properties of the innermost narrow line region in a sample of low-luminosity AGN. We select 33 LINERs (bona fide AGN) and Seyfert galaxies from the optical spectroscopic Palomar survey observed by HST/STIS. We find that in LINERs the [ N II ] and [ O I ] lines are broader than the [ S II ] line and that the [ N II ] /[ S II ] flux ratio increases when moving from ground-based to HST spectra. This effect is more pronounced considering the wings of the lines. Our interpretation is that, as a result of superior HST spatial resolution, we isolate a compact region of dense ionized gas in LINERs, located at a typical distance of ~3 pc and with a gas density of ~10^4-10^5 cm^-3, which we identify with the outer portion of the intermediate line region (ILR). Instead, we do not observe these kinds of effects in Seyferts; this may be the result of a stronger dilution from the NLR emission, since the HST slit maps a larger region in these sources. Alternatively, we argue that the innermost, higher density component of the ILR is only present in Seyferts, while it is truncated at larger radii because of the presence of the circumnuclear torus. The ILR is only visible in its entirety in LINERs because the obscuring torus is not present in these sources. | URI: | http://hdl.handle.net/20.500.12386/24464 | URL: | https://www.aanda.org/articles/aa/abs/2016/02/aa26927-15/aa26927-15.html https://arxiv.org/pdf/1512.03234.pdf |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201526927 | Bibcode ADS: | 2016A&A...586A..48B | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
aa26927-15.pdf | pdf editoriale | 2.78 MB | Adobe PDF | Visualizza/apri |
Page view(s)
46
controllato il 25-apr-2024
Download(s)
21
controllato il 25-apr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.