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Deep ALMA photometr...
Deep ALMA photometry of distant X-ray AGN: improvements in star formation rate constraints, and AGN identification
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- Stanley, Flora, 1990 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Harrison, C. M. (author)
- European Southern Observatory (ESO)
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- Alexander, D. M. (author)
- Durham University
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- Simpson, J. (author)
- Academia Sinica Taiwan
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- Knudsen, Kirsten Kraiberg, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Mullaney, J. R. (author)
- University of Sheffield
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- Rosario, D. J. (author)
- Durham University
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- Scholtz, J. (author)
- Durham University
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(creator_code:org_t)
- 2018-05-07
- 2018
- English.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 478:3, s. 3721-3739
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https://doi.org/10.1...
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Abstract
Subject headings
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- We present the star formation rates (SFRs) of a sample of 109 galaxies with X-ray selected active galactic nuclei (AGN) with moderate to high X-ray luminosities (L(2-8keV) = 10^42 - 10^45 erg/s), at redshifts 1 < z <4.7, that were selected to be faint or undetected in the Herschel bands. We combine our deep ALMA continuum observations with deblended 8-500um photometry from Spitzer and Herschel , and use infrared (IR) SED fitting and AGN - star formation decomposition methods. The addition of the ALMA photometry results in an order of magnitude more X-ray AGN in our sample with a measured SFR (now 37%). The remaining 63% of the sources have SFR upper limits that are typically a factor of ~2-10 times lower than the pre-ALMA constraints. With the improved constraints on the IR SEDs, we can now identify a mid-IR (MIR) AGN component in 50% of our sample, compared to only ~1% previously. We further explore the F(870um)/F(24um)--redshift plane as a tool for the identification of MIR emitting AGN, for three different samples representing AGN dominated, star formation dominated, and composite sources. We demonstrate that the F(870um)/F(24um)--redshift plane can successfully split between AGN and star formation dominated sources, and can be used as an AGN identification method.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: active
- galaxies: evolution
- galaxies: star formation
Publication and Content Type
- art (subject category)
- ref (subject category)
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