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Accurate classification of 17 AGNs detected with Swift/BAT

Accurate classification of 17 AGNs detected with Swift/BAT
Accurate classification of 17 AGNs detected with Swift/BAT
Through an optical campaign performed at 5 telescopes located in the northern and the southern hemispheres, plus archival data from two on line sky surveys, we have obtained optical spectroscopy for 17 counterparts of suspected or poorly studied hard X-ray emitting active galactic nuclei (AGNs) detected with Swift/BAT in order to determine or better classify their nature. We find that 7 sources of our sample are type 1 AGNs, 9 are type 2 AGNs, and 1 object is an X-ray bright optically normal galaxy; the redshifts of these objects lie in a range between 0.012 and 0.286. For all these sources, X-ray data analysis was also performed to estimate their absorption column and to search for possible Compton thick candidates. Among our type 2 objects, we did not find any clear Compton thick AGN, but at least 6 out of 9 of them are highly absorbed ( NH > 1023 cm-2), while one does not require intrinsic absorption; i.e., it appears to be a naked Seyfert 2 galaxy.
galaxies: seyfert, techniques: spectroscopic
0004-6361
1345-1358
Parisi, P.
63895ce6-8068-4902-a62d-f6a74d3502c6
Masetti, N.
78166fad-2a82-4de5-9359-25706c0a6e2f
Jiménez-Bailón, E.
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Chavushyan, V.
5942e1ed-aece-4607-bb78-6dc672ef873c
Malizia, A.
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Landi, R.
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Molina, M.
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Fiocchi, M.
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Palazzi, E.
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Bassani, L.
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Bazzano, A.
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Bird, A.J.
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Dean, A.J.
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Galaz, G.
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Mason, E.
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Minniti, D.
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Morelli, L.
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Stephen, J.B.
c0b1afce-f3d9-4568-b2c1-51482f80cd9a
Ubertini, P.
7035748e-152c-473e-8766-a2fa3ac49fcb
Parisi, P.
63895ce6-8068-4902-a62d-f6a74d3502c6
Masetti, N.
78166fad-2a82-4de5-9359-25706c0a6e2f
Jiménez-Bailón, E.
69ff2574-2233-43fa-8dae-24cf0ddd7d8b
Chavushyan, V.
5942e1ed-aece-4607-bb78-6dc672ef873c
Malizia, A.
efa63850-cf26-482c-ae3b-54b0c8fb8a87
Landi, R.
b8243478-d7a1-4774-8a66-4158a65a33d3
Molina, M.
28a3f3b6-aedf-4fa5-9a4f-dbcba001435d
Fiocchi, M.
74d63e71-f43d-494b-92ee-07dc83d18de1
Palazzi, E.
e9674d6b-8d34-4c1d-8ec0-0dd82392f18b
Bassani, L.
07e5602c-f97e-4334-a0fa-c2212431a61a
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Galaz, G.
f73a33db-66cf-444d-9d2e-726ad63dc92c
Mason, E.
fc4644d3-13af-477c-ba04-8288aa7e20a5
Minniti, D.
9c08ee4b-c89a-4b25-a0ee-1c4a2684431c
Morelli, L.
5bb1b27f-39a5-4180-93bc-9aa86a61ba05
Stephen, J.B.
c0b1afce-f3d9-4568-b2c1-51482f80cd9a
Ubertini, P.
7035748e-152c-473e-8766-a2fa3ac49fcb

Parisi, P., Masetti, N., Jiménez-Bailón, E., Chavushyan, V., Malizia, A., Landi, R., Molina, M., Fiocchi, M., Palazzi, E., Bassani, L., Bazzano, A., Bird, A.J., Dean, A.J., Galaz, G., Mason, E., Minniti, D., Morelli, L., Stephen, J.B. and Ubertini, P. (2009) Accurate classification of 17 AGNs detected with Swift/BAT. Astronomy & Astrophysics, 507 (3), 1345-1358. (doi:10.1051/0004-6361/200912931).

Record type: Article

Abstract

Through an optical campaign performed at 5 telescopes located in the northern and the southern hemispheres, plus archival data from two on line sky surveys, we have obtained optical spectroscopy for 17 counterparts of suspected or poorly studied hard X-ray emitting active galactic nuclei (AGNs) detected with Swift/BAT in order to determine or better classify their nature. We find that 7 sources of our sample are type 1 AGNs, 9 are type 2 AGNs, and 1 object is an X-ray bright optically normal galaxy; the redshifts of these objects lie in a range between 0.012 and 0.286. For all these sources, X-ray data analysis was also performed to estimate their absorption column and to search for possible Compton thick candidates. Among our type 2 objects, we did not find any clear Compton thick AGN, but at least 6 out of 9 of them are highly absorbed ( NH > 1023 cm-2), while one does not require intrinsic absorption; i.e., it appears to be a naked Seyfert 2 galaxy.

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Published date: 1 December 2009
Keywords: galaxies: seyfert, techniques: spectroscopic

Identifiers

Local EPrints ID: 144767
URI: http://eprints.soton.ac.uk/id/eprint/144767
ISSN: 0004-6361
PURE UUID: 172304f8-d182-4bfb-8a48-76932aa3047a
ORCID for A.J. Bird: ORCID iD orcid.org/0000-0002-6888-8937

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Date deposited: 24 May 2010 15:23
Last modified: 09 Nov 2021 02:44

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Contributors

Author: P. Parisi
Author: N. Masetti
Author: E. Jiménez-Bailón
Author: V. Chavushyan
Author: A. Malizia
Author: R. Landi
Author: M. Molina
Author: M. Fiocchi
Author: E. Palazzi
Author: L. Bassani
Author: A. Bazzano
Author: A.J. Bird ORCID iD
Author: A.J. Dean
Author: G. Galaz
Author: E. Mason
Author: D. Minniti
Author: L. Morelli
Author: J.B. Stephen
Author: P. Ubertini

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