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  Kiloparsec-scale ALMA imaging of [C ii] and dust continuum emission of 27 quasar host galaxies at z ~ 6

Venemans, B. P., Walter, F., Neeleman, M., Novak, M., Otter, J., Decarli, R., et al. (2020). Kiloparsec-scale ALMA imaging of [C ii] and dust continuum emission of 27 quasar host galaxies at z ~ 6. The Astrophysical Journal, 904(2): 130. doi:10.3847/1538-4357/abc563.

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Kiloparsec-scale ALMA Imaging of [C ii] and Dust Continuum Emission of 27 Quasar Host Galaxies at z ~ 6.pdf (Any fulltext), 4MB
 
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Venemans, Bram P., Author
Walter, Fabian, Author
Neeleman, Marcel, Author
Novak, Mladen, Author
Otter, Justin, Author
Decarli, Roberto, Author
Bañados, Eduardo, Author
Drake, Alyssa, Author
Farina, Emanuele Paolo1, Author              
Kaasinen, Melanie, Author
Mazzucchelli, Chiara, Author
Carilli, Chris, Author
Fan, Xiaohui, Author
Rix, Hans-Walter, Author
Wang, Ran, Author
Affiliations:
1Cosmology, MPI for Astrophysics, Max Planck Society, ou_159876              

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 Abstract: We present a study of the [CII] 158micron line and underlying far-infrared (FIR) continuum emission of 27 quasar host galaxies at z~6, traced by the Atacama Large Millimeter/submillimeter Array at a spatial resolution of ~1 physical kpc. The [CII] emission in the bright, central regions of the quasars have sizes of 1.0-4.8kpc. The dust continuum emission is typically more compact than [CII]. We find that 13/27 quasars (approximately one-half) have companion galaxies in the field, at projected separations of 3-90kpc. The position of dust emission and the Gaia-corrected positions of the central accreting black holes are cospatial (typical offsets <0.1"). This suggests that the central black holes are located at the bottom of the gravitational wells of the dark matter halos in which the z>6 quasar hosts reside. Some outliers with offsets of ~500pc can be linked to disturbed morphologies, most likely due to ongoing or recent mergers. We find no correlation between the central brightness of the FIR emission and the bolometric luminosity of the accreting black hole. The FIR-derived star-formation rate densities (SFRDs) in the host galaxies peak at the galaxies' centers, at typical values between 100 and 1000 M_sun/yr/kpc^2. These values are below the Eddington limit for star formation, but similar to those found in local ultraluminous infrared galaxies. The SFRDs drop toward larger radii by an order of magnitude. Likewise, the [CII]/FIR luminosity ratios of the quasar hosts are lowest in their centers (few x10^-4) and increase by a factor of a few toward the galaxies' outskirts, consistent with resolved studies of lower-redshift sources.

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Language(s): eng - English
 Dates: 2020-11-27
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/abc563
Other: LOCALID: 3283035
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 904 (2) Sequence Number: 130 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3