Skip navigation
  • INAF logo
  • Home
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects
  • Explore by
    • Research outputs
    • Researchers
    • Organization units
    • Projects
  • Login:
    • My DSpace
    • Receive email
      updates
    • Edit Account details
  • Italian
  • English

  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29092
Title: Active galactic nuclei vs. host galaxy properties in the COSMOS field
Authors: LANZUISI, Giorgio 
DELVECCHIO, IVAN 
Berta, S.
Brusa, M.
COMASTRI, Andrea 
GILLI, Roberto 
GRUPPIONI, Carlotta 
MARCHESI, STEFANO 
Perna, M.
Pozzi, F.
Salvato, M.
Symeonidis, M.
Vignali, C.
Vito, F.
Volonteri, M.
Zamorani, G.
Issue Date: 2017
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 602
First Page: A123
Abstract: Context. The coeval active galactic nuclei (AGN) and galaxy evolution, and the observed local relations between super massive black holes (SMBHs) and galaxy properties suggest some sort of connection or feedback between SMBH growth (I.e., AGN activity) and galaxy build-up (I.e., star formation history). <BR /> Aims: We looked for correlations between average properties of X-ray detected AGN and their far-IR (FIR) detected, star forming host galaxies in order to find quantitative evidence for this connection, which has been highly debated in recent years. <BR /> Methods: We exploited the rich multiwavelength data set (from X-ray to FIR) available in the COSMOS field for a large sample (692 sources) of AGN and their hosts in the redshift range 0.1 <z< 4. We use X-ray data to select AGN and determine their properties, such as X-ray intrinsic luminosity and nuclear obscuration, and broadband (from UV to FIR) SED fitting results to derive host galaxy properties, such as stellar mass (M<SUB>∗</SUB>) and star formation rate (SFR). <BR /> Results: We find that the AGN 2-10 keV luminosity (L<SUB>X</SUB>) and the host 8-1000 μm star formation luminosity (L<SUB>IR</SUB><SUP>SF</SUP>) are significantly correlated, even after removing the dependency of both quantities with redshift. However, the average host L<SUB>IR</SUB><SUP>SF</SUP> has a flat distribution in bins of AGN L<SUB>X</SUB>, while the average AGN L<SUB>X</SUB> increases in bins of host L<SUB>IR</SUB><SUP>SF</SUP> with logarithmic slope of 0.7 in the redshift range 0.4 <z< 1.2. We also discuss the comparison between the full distribution of these two quantities and the predictions from hydrodynamical simulations. No other significant correlations between AGN L<SUB>X</SUB> and host properties is found. On the other hand, we find that the average column density (N<SUB>H</SUB>) shows a clear positive correlation with the host M<SUB>∗</SUB> at all redshifts, but not with the SFR (or L<SUB>IR</SUB><SUP>SF</SUP>). This translates into a negative correlation with specific SFR at all redshifts. The same is true if the obscured fraction is computed. <BR /> Conclusions: Our results are in agreement with the idea, introduced in recent galaxy evolutionary models, that SMBH accretion and SFRs are correlated, but occur with different variability time scales. Finally, the presence of a positive correlation between N<SUB>H</SUB> and host M<SUB>∗</SUB> suggests that the column density that we observe in the X-rays is not entirely due to the circumnuclear obscuring torus, but may also include a significant contribution from the host galaxy. <P />Full Table 1 is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/602/A123">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/602/A123
URI: http://hdl.handle.net/20.500.12386/29092
URL: https://www.aanda.org/articles/aa/full_html/2017/06/aa29955-16/aa29955-16.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201629955
Bibcode ADS: 2017A&A...602A.123L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat 
aa29955-16.pdfPdf editoriale1.65 MBAdobe PDFView/Open
Show full item record

Page view(s)

11
checked on Jan 18, 2021

Download(s)

2
checked on Jan 18, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are published in Open Access, unless otherwise indicated.


Explore by
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects

Informazioni e guide per autori

https://openaccess-info.inaf.it: tutte le informazioni sull'accesso aperto in INAF

Come si inserisce un prodotto: le guide a OA@INAF

La Policy INAF sull'accesso aperto

Documenti e modelli scaricabili

Feedback
Built with DSpace-CRIS - Extension maintained and optimized by Logo 4SCIENCE