Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/26698
Titolo: | BAT AGN Spectroscopic Survey. I. Spectral Measurements, Derived Quantities, and AGN Demographics | Autori: | Koss, Michael Trakhtenbrot, Benny Ricci, Claudio Lamperti, Isabella Oh, Kyuseok Berney, Simon Schawinski, Kevin Baloković, Mislav Baronchelli, Linda Crenshaw, D. Michael Fischer, Travis Gehrels, Neil Harrison, Fiona Hashimoto, Yasuhiro Hogg, Drew Ichikawa, Kohei MASETTI, NICOLA Mushotzky, Richard Sartori, Lia Stern, Daniel Treister, Ezequiel Ueda, Yoshihiro Veilleux, Sylvain Winter, Lisa |
Data pubblicazione: | 2017 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 850 | Fascicolo: | 1 | Da pagina:: | 1 | Abstract: | We present the first catalog and data release of the Swift-BAT AGN Spectroscopic Survey. We analyze optical spectra of the majority of the detected AGNs (77%, 642/836)based on their 14-195 keV emission in the 70-month Swift-BAT all-sky catalog. This includes redshift determination, absorption and emission-line measurements, and black hole mass and accretion rate estimates for the majority of obscured and unobscured AGNs (74%, 473/642), with 340 measured for the first time. With ∼90% of sources at z< 0.2, the survey represents a significant advance in the census of hard X-ray-selected AGNs in the local universe. In this first catalog paper, we describe the spectroscopic observations and data sets, and our initial spectral analysis. The FWHMs of the emission lines show broad agreement with the X-ray obscuration (∼94%), such that Sy 1-1.8 have {N}<SUB>{{H</SUB>}}< {10}<SUP>21.9</SUP> cm<SUP>-2</SUP>, and Seyfert 2 have {N}<SUB>{{H</SUB>}}> {10}<SUP>21.9</SUP> cm<SUP>-2</SUP>. Seyfert 1.9, however, show a range of column densities. Compared to narrow-line AGNs in the SDSS, the X-ray-selected AGNs have a larger fraction of dusty host galaxies ({{H}}α /{{H}}β > 5), suggesting that these types of AGN are missed in optical surveys. Using the [O III] λ5007/Hβ and [N II] λ6583/Hα emission-line diagnostic, about half of the sources are classified as Seyferts; ∼15% reside in dusty galaxies that lack an Hβ detection, but for which the upper limits on line emission imply either a Seyfert or LINER, ∼ 15 % are in galaxies with weak or no emission lines despite high-quality spectra, and a few percent each are LINERS, composite galaxies, H II regions, or in known beamed AGNs. | URI: | http://hdl.handle.net/20.500.12386/26698 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/aa8ec9 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/aa8ec9 | Bibcode ADS: | 2017ApJ...850...74K | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
2017ApJ__850__74K.pdf | Pdf editoriale | 5.77 MB | Adobe PDF | Visualizza/apri |
Page view(s)
75
controllato il 11-set-2024
Download(s)
34
controllato il 11-set-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.