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AGN in dusty hosts : implications for galaxy evolution

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Abstract
We present strong empirical evidence for a physical connection between the occurrence of a starburst (SB) and a luminous active galactic nucleus (AGN) phase. Drawing infrared (IR), X-ray and optically selected samples from COSMOS, we find that the locus of type II AGN hosts in the optical colour-magnitude (U - V/V) and colour-colour (U - V/V - J) space significantly overlaps with that of IR-luminous (L-IR > 10(10) L-circle dot) galaxies. Based on our observations, we propose that, when simultaneously building their black hole and stellar masses, type II AGN hosts are located in the same part of colour-colour space as dusty star-forming galaxies. In fact, our results show that IR-luminous galaxies at z < 1.5 are on average three times more likely to host a type II AGN (L-X > 10(42) erg s(-1)) than would be expected serendipitously, if AGN and star-formation events were unrelated. In addition, the optical and IR properties of the AGN/SB hybrid systems tentatively suggest that the AGN phase might be coeval with a particularly active phase in a galaxy's star-formation history. Interestingly, we also find a significant fraction of type II AGN hosts offset from the dusty galaxy sequence in colour-colour space, possibly representing a transitional or post-SB phase in galaxy evolution. Our findings are consistent with a scenario whereby AGN play a role in the termination of star formation in massive galaxies.
Keywords
ACTIVE GALACTIC NUCLEI, WIDE-FIELD SURVEY, SIMILAR-TO 1, COLOR-MAGNITUDE, DIAGRAM, X-RAY, COSMOS FIELD, STAR-FORMATION, BLACK-HOLES, XMM-COSMOS, PHOTOMETRIC REDSHIFT, galaxies: active, galaxies: evolution, galaxies: starburst, infrared: galaxies, X-rays: galaxies

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MLA
Symeonidis, M, J Kartaltepe, M Salvato, et al. “AGN in Dusty Hosts : Implications for Galaxy Evolution.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 433.2 (2013): 1015–1022. Print.
APA
Symeonidis, M., Kartaltepe, J., Salvato, M., Bongiorno, A., Brusa, M., Page, M., Ilbert, O., et al. (2013). AGN in dusty hosts : implications for galaxy evolution. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 433(2), 1015–1022.
Chicago author-date
Symeonidis, M, J Kartaltepe, M Salvato, A Bongiorno, M Brusa, MJ Page, O Ilbert, D Sanders, and Arjen van der Wel. 2013. “AGN in Dusty Hosts : Implications for Galaxy Evolution.” Monthly Notices of the Royal Astronomical Society 433 (2): 1015–1022.
Chicago author-date (all authors)
Symeonidis, M, J Kartaltepe, M Salvato, A Bongiorno, M Brusa, MJ Page, O Ilbert, D Sanders, and Arjen van der Wel. 2013. “AGN in Dusty Hosts : Implications for Galaxy Evolution.” Monthly Notices of the Royal Astronomical Society 433 (2): 1015–1022.
Vancouver
1.
Symeonidis M, Kartaltepe J, Salvato M, Bongiorno A, Brusa M, Page M, et al. AGN in dusty hosts : implications for galaxy evolution. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2013;433(2):1015–22.
IEEE
[1]
M. Symeonidis et al., “AGN in dusty hosts : implications for galaxy evolution,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol. 433, no. 2, pp. 1015–1022, 2013.
@article{8572979,
  abstract     = {{We present strong empirical evidence for a physical connection between the occurrence of a starburst (SB) and a luminous active galactic nucleus (AGN) phase. Drawing infrared (IR), X-ray and optically selected samples from COSMOS, we find that the locus of type II AGN hosts in the optical colour-magnitude (U - V/V) and colour-colour (U - V/V - J) space significantly overlaps with that of IR-luminous (L-IR > 10(10) L-circle dot) galaxies. Based on our observations, we propose that, when simultaneously building their black hole and stellar masses, type II AGN hosts are located in the same part of colour-colour space as dusty star-forming galaxies. In fact, our results show that IR-luminous galaxies at z < 1.5 are on average three times more likely to host a type II AGN (L-X > 10(42) erg s(-1)) than would be expected serendipitously, if AGN and star-formation events were unrelated. In addition, the optical and IR properties of the AGN/SB hybrid systems tentatively suggest that the AGN phase might be coeval with a particularly active phase in a galaxy's star-formation history. Interestingly, we also find a significant fraction of type II AGN hosts offset from the dusty galaxy sequence in colour-colour space, possibly representing a transitional or post-SB phase in galaxy evolution. Our findings are consistent with a scenario whereby AGN play a role in the termination of star formation in massive galaxies.}},
  author       = {{Symeonidis, M and Kartaltepe, J and Salvato, M and Bongiorno, A and Brusa, M and Page, MJ and Ilbert, O and Sanders, D and van der Wel, Arjen}},
  issn         = {{0035-8711}},
  journal      = {{MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY}},
  keywords     = {{ACTIVE GALACTIC NUCLEI,WIDE-FIELD SURVEY,SIMILAR-TO 1,COLOR-MAGNITUDE,DIAGRAM,X-RAY,COSMOS FIELD,STAR-FORMATION,BLACK-HOLES,XMM-COSMOS,PHOTOMETRIC REDSHIFT,galaxies: active,galaxies: evolution,galaxies: starburst,infrared: galaxies,X-rays: galaxies}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{1015--1022}},
  title        = {{AGN in dusty hosts : implications for galaxy evolution}},
  url          = {{http://dx.doi.org/10.1093/mnras/stt782}},
  volume       = {{433}},
  year         = {{2013}},
}

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