The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

Clustering of moderate luminosity X-ray-selected Type 1 and Type 2 AGNS at Z ~ 3

Clustering of moderate luminosity X-ray-selected Type 1 and Type 2 AGNS at Z ~ 3
Clustering of moderate luminosity X-ray-selected Type 1 and Type 2 AGNS at Z ~ 3
We investigate, for the first time at z ~ 3, the clustering properties of 189 Type 1 and 157 Type 2 X-ray active galactic nuclei (AGNs) of moderate luminosity (langL bolrang = 1045.3 erg s–1), with photometric or spectroscopic redshifts in the range 2.2 < z < 6.8. These samples are based on Chandra and XMM-Newton data in COSMOS. We find that Type 1 and Type 2 COSMOS AGNs at z ~ 3 inhabit DMHs with typical mass of log Mh = 12.84$^{+0.10}_{-0.11}$ and 11.73$^{+0.39}_{-0.45}$ h –1 M ☉, respectively. This result requires a drop in the halo masses of Type 1 and 2 COSMOS AGNs at z ~ 3 compared to z lesssim 2 XMM-COSMOS AGNs with similar luminosities. Additionally, we infer that unobscured COSMOS AGNs at z ~ 3 reside in 10 times more massive halos compared to obscured COSMOS AGNs, at the 2.6σ level. This result extends to z ~ 3 the results found in COSMOS at z lesssim 2, and rules out the picture in which obscuration is purely an orientation effect. A model which assumes that the AGNs activity is triggered by major mergers is quite successful in predicting both the low halo mass of COSMOS AGNs and the typical mass of luminous SDSS quasars at z ~ 3, with the latter inhabiting more massive halos respect to moderate luminosity AGNs. Alternatively we can argue, at least for Type 1 COSMOS AGNs, that they are possibly representative of an early phase of fast (i.e., Eddington limited) BH growth induced by cosmic cold flows or disk instabilities. Given the moderate luminosity, these new fast growing BHs have masses of ~107-8 M ☉ at z ~ 3 which might evolve into ~108.5-9 M ☉ mass BHs at z = 0. Following our clustering measurements, we argue that this fast BH growth at z ~ 3 in AGNs with moderate luminosity occurs in DMHs with typical mass of ~ 6× 1012 h –1 M ☉.
0004-637X
4
Allevato, V.
6ddb9ca0-91f0-4793-bfb1-2fc706fb79a0
Finoguenov, A.
80b1e483-8ac1-420f-ba22-78000679e4f4
Civano, F.
79ad77dd-8b26-4346-ae00-ead1f55b0664
Cappelluti, N.
ec0e1455-2f05-48e6-8a71-9b779581ee64
Shankar, F.
b10c91e4-85cd-4394-a18a-d4f049fd9cdb
Miyaji, T.
9ddc15a6-b161-4742-afc5-737db5440643
Hasinger, G.
030f99e8-169e-48e9-9278-b971cfa3a948
Gilli, R.
0b5f0859-81e0-4151-8eb3-f7cc1f2fbaf9
Zamorani, G.
316aede1-9ee4-46e1-8824-69c1e2060308
Lanzuisi, G.
93c0256d-2ab4-49a4-94e7-872ae54df6c3
Salvato, M.
d4005dcf-cb25-4a2c-b451-ae25943a2c2c
Elvis, M.
91bfdea0-b84c-4ff0-ae68-53247680762e
Comastri, A.
8068001f-aff5-4dcd-906c-1c91af4bad97
Silverman, J.
fd71d493-36a2-4939-8876-d19cf4ebf2c5
Allevato, V.
6ddb9ca0-91f0-4793-bfb1-2fc706fb79a0
Finoguenov, A.
80b1e483-8ac1-420f-ba22-78000679e4f4
Civano, F.
79ad77dd-8b26-4346-ae00-ead1f55b0664
Cappelluti, N.
ec0e1455-2f05-48e6-8a71-9b779581ee64
Shankar, F.
b10c91e4-85cd-4394-a18a-d4f049fd9cdb
Miyaji, T.
9ddc15a6-b161-4742-afc5-737db5440643
Hasinger, G.
030f99e8-169e-48e9-9278-b971cfa3a948
Gilli, R.
0b5f0859-81e0-4151-8eb3-f7cc1f2fbaf9
Zamorani, G.
316aede1-9ee4-46e1-8824-69c1e2060308
Lanzuisi, G.
93c0256d-2ab4-49a4-94e7-872ae54df6c3
Salvato, M.
d4005dcf-cb25-4a2c-b451-ae25943a2c2c
Elvis, M.
91bfdea0-b84c-4ff0-ae68-53247680762e
Comastri, A.
8068001f-aff5-4dcd-906c-1c91af4bad97
Silverman, J.
fd71d493-36a2-4939-8876-d19cf4ebf2c5

Allevato, V., Finoguenov, A., Civano, F., Cappelluti, N., Shankar, F., Miyaji, T., Hasinger, G., Gilli, R., Zamorani, G., Lanzuisi, G., Salvato, M., Elvis, M., Comastri, A. and Silverman, J. (2014) Clustering of moderate luminosity X-ray-selected Type 1 and Type 2 AGNS at Z ~ 3. The Astrophysical Journal, 796 (1), 4. (doi:10.1088/0004-637X/796/1/4).

Record type: Article

Abstract

We investigate, for the first time at z ~ 3, the clustering properties of 189 Type 1 and 157 Type 2 X-ray active galactic nuclei (AGNs) of moderate luminosity (langL bolrang = 1045.3 erg s–1), with photometric or spectroscopic redshifts in the range 2.2 < z < 6.8. These samples are based on Chandra and XMM-Newton data in COSMOS. We find that Type 1 and Type 2 COSMOS AGNs at z ~ 3 inhabit DMHs with typical mass of log Mh = 12.84$^{+0.10}_{-0.11}$ and 11.73$^{+0.39}_{-0.45}$ h –1 M ☉, respectively. This result requires a drop in the halo masses of Type 1 and 2 COSMOS AGNs at z ~ 3 compared to z lesssim 2 XMM-COSMOS AGNs with similar luminosities. Additionally, we infer that unobscured COSMOS AGNs at z ~ 3 reside in 10 times more massive halos compared to obscured COSMOS AGNs, at the 2.6σ level. This result extends to z ~ 3 the results found in COSMOS at z lesssim 2, and rules out the picture in which obscuration is purely an orientation effect. A model which assumes that the AGNs activity is triggered by major mergers is quite successful in predicting both the low halo mass of COSMOS AGNs and the typical mass of luminous SDSS quasars at z ~ 3, with the latter inhabiting more massive halos respect to moderate luminosity AGNs. Alternatively we can argue, at least for Type 1 COSMOS AGNs, that they are possibly representative of an early phase of fast (i.e., Eddington limited) BH growth induced by cosmic cold flows or disk instabilities. Given the moderate luminosity, these new fast growing BHs have masses of ~107-8 M ☉ at z ~ 3 which might evolve into ~108.5-9 M ☉ mass BHs at z = 0. Following our clustering measurements, we argue that this fast BH growth at z ~ 3 in AGNs with moderate luminosity occurs in DMHs with typical mass of ~ 6× 1012 h –1 M ☉.

This record has no associated files available for download.

More information

Published date: 1 November 2014

Identifiers

Local EPrints ID: 439344
URI: http://eprints.soton.ac.uk/id/eprint/439344
ISSN: 0004-637X
PURE UUID: 6e67a1e4-f93e-480f-8976-45cf0885dea6

Catalogue record

Date deposited: 17 Apr 2020 16:30
Last modified: 20 May 2020 16:34

Export record

Altmetrics

Contributors

Author: V. Allevato
Author: A. Finoguenov
Author: F. Civano
Author: N. Cappelluti
Author: F. Shankar
Author: T. Miyaji
Author: G. Hasinger
Author: R. Gilli
Author: G. Zamorani
Author: G. Lanzuisi
Author: M. Salvato
Author: M. Elvis
Author: A. Comastri
Author: J. Silverman

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×