Star formation in AGN hosts in GOODS-N

By L. Shao, D. Lutz, R. Nordon, R. Maiolino, D. Alexander, B. Altieri, P. Andreani, H. Aussel, F. Bauer, S. Berta and 33 more. 2010

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Sensitive Herschel far-infrared observations can break degeneracies that were inherent to previous studies of star formation in high-z AGN hosts. Combining PACS 100 and 160 μm observations of the GOODS-N field with 2 Ms Chandra data, we detect ∼20% of X-ray AGN individually at >3σ. The host far-infrared luminosity of AGN with L2−10 keV ≈ 10 43 erg s −1 increases with redshift by an order of magnitude from z = 0 to z ∼ 1. In contrast, there is little dependence of far-infrared luminosity on AGN luminosity, for L2−10 keV 1. We do not find a dependence of far-infrared luminosity on X-ray obscuring column, for our sample which is dominated by L2−10 keV < 10 44 erg s −1 AGN. In conjunction with properties of local and luminous high-z AGN, we interpret these results as reflecting the interplay between two paths of AGN/host coevolution. A correlation of AGN luminosity and host star formation is traced locally over a wide range of luminosities and also extends to luminous high-z AGN. This correlation reflects an evolutionary connection, likely via merging. For lower AGN luminosities, star formation is similar to that in non-active massive galaxies and shows little dependence on AGN luminosity. The level of this secular, non-merger driven star formation increasingly dominates over the correlation at increasing redshift.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/e183cccc37f640c485c62806b05574f3de10ced3

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In Astronomy and Astrophysics

  1. D. M. Alexander
  2. P. Hopkins
  3. L. Hernquist
  4. E. Daddi
  5. D. Elbaz
  6. W. N. Brandt
  7. R. Dav'e
  8. D. Lutz

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