SIMBAD references

2014MNRAS.445.2848G - Mon. Not. R. Astron. Soc., 445, 2848-2853 (2014/December-2)

First CO(17-16) emission line detected in a z > 6 quasar.


Abstract (from CDS):

We report the serendipitous detection of the CO(17-16) emission line towards the quasar sloan digital sky survey J114816.64+525150.3 (J1148) at redshift z ≃ 6.4 obtained with the Plateau de Bure Interferometer. The CO(17-16) line is possibly contaminated by OH+ emission, that may account for ∼ 35-60 percent of the total flux observed. Photodissociation and X-ray-dominated regions (PDRs and XDRs) models show that PDRs alone cannot reproduce the high luminosity of the CO(17-16) line relative to low-J CO transitions and that XDRs are required. By adopting a composite PDR+XDR model, we derive molecular cloud and radiation field properties in the nuclear region of J1148. Our results show that highly excited CO lines represent a sensitive and possibly unique tool to infer the presence of X-ray faint or obscured supermassive black hole progenitors in high-z galaxies.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): ISM: clouds - ISM: molecules - galaxies: high redshift - intergalactic medium - quasars: super massive black holes - X-ray: ISM

Simbad objects: 10

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