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  No evidence for [c ii] halos or high-velocity outflows in z ≳ 6 quasar host galaxies

Novak, M., Venemans, B. P., Walter, F., Neeleman, M., Kaasinen, M., Liang, L., et al. (2020). No evidence for [c ii] halos or high-velocity outflows in z ≳ 6 quasar host galaxies. The Astrophysical Journal, 904(2): 131. doi:10.3847/1538-4357/abc33f.

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No Evidence for [C ii] Halos or High-velocity Outflows in z greater than or similar to 6 Quasar Host Galaxies.pdf (Any fulltext), 8MB
 
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Novak, Mladen, Author
Venemans, Bram P., Author
Walter, Fabian, Author
Neeleman, Marcel, Author
Kaasinen, Melanie, Author
Liang, Lichen, Author
Feldmann, Robert, Author
Bañados, Eduardo, Author
Carilli, Chris, Author
Decarli, Roberto, Author
Drake, Alyssa B., Author
Fan, Xiaohui, Author
Farina, Emanuele P.1, Author              
Mazzucchelli, Chiara, Author
Rix, Hans-Walter, Author
Wang, Ran, Author
Affiliations:
1Cosmology, MPI for Astrophysics, Max Planck Society, ou_159876              

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 Abstract: We study the interstellar medium in a sample of 27 high-redshift quasar host galaxies at z ≳ 6, using the [C ii] 158 μm emission line and the underlying dust continuum observed at ~1 kpc resolution with Atacama Large Millimeter Array. By performing uv-plane spectral stacking of both the high and low spatial resolution data, we investigate the spatial and velocity extent of gas and the size of the dust-emitting regions. We find that the average surface brightness profile of both the [C ii] and the dust continuum emission can be described by a steep component within a radius of 2 kpc and a shallower component with a scale length of 2 kpc, detected up to ~10 kpc. The surface brightness of the extended emission drops below ~1% of the peak at radius of ~5 kpc, beyond which it constitutes 10%–20% of the total measured flux density. Although the central component of the dust continuum emission is more compact than that of the [C ii] emission, the extended components have equivalent profiles. The observed extended components are consistent with those predicted by hydrodynamical simulations of galaxies with similar infrared luminosities, where the dust emission is powered by star formation. The [C ii] spectrum measured in the mean uv-plane stacked data can be described by a single Gaussian, with no observable [C ii] broad-line emission (velocities in excess of ≳500 km s−1), which would be indicative of outflows. Our findings suggest that we are probing the interstellar medium and associated star formation in the quasar host galaxies up to radii of 10 kpc, whereas we find no evidence for halos or outflows.

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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/abc33f
Other: LOCALID: 3283029
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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: 131 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3