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Constraints on high-J CO emission lines in z similar to 6 quasars
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Leiden Observatory, The Netherlands.ORCID iD: 0000-0002-3258-3672
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Number of Authors: 132019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 489, no 3, p. 3939-3952Article in journal (Refereed) Published
Abstract [en]

We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of eight highly excited CO (J(up) > 8) lines and continuum emission in two z similar to 6 quasars: SDSS J231038.88+185519.7 (hereafter J2310), for which CO(8-7), CO(9-8), and CO(17-16) lines have been observed, and ULAS J131911.29+095951.4 (J1319), observed in the CO(14-13), CO(17-16), and CO(19-18) lines. The continuum emission of both quasars arises from a compact region (<0.9 kpc). By assuming a modified blackbody law, we estimate dust masses of log(M-dust/M-circle dot) = 8.75 +/- 0.07 and log(M-dust/M-circle dot) = 8.8 +/- 0.2 and dust temperatures of T-dust = 76 +/- 3 K and T-dust = 66(-10)(+15) K, respectively, for J2310 and J1319. Only CO(8-7) and CO(9-8) in J2310 are detected, while 3 sigma upper limits on luminosities are reported for the other lines of both quasars. The CO line luminosities and upper limits measured in J2310 and J1319 are consistent with those observed in local active galactic nuclei and starburst galaxies, and other z similar to 6 quasars, except for SDSS J1148+5251 (J1148), the only quasar at z = 6.4 with a previous CO(17-16) line detection. By computing the CO spectral line energy distributions normalized to the CO(6-5) line and far-infrared luminosities for J2310, J1319, and J1148, we conclude that different gas heating mechanisms (X-ray radiation and/or shocks) may explain the different CO luminosities observed in these z similar to 6 quasar. Future J(up) > 8 CO observations will be crucial to understand the processes responsible for molecular gas excitation in luminous high-z quasars.

Place, publisher, year, edition, pages
2019. Vol. 489, no 3, p. 3939-3952
Keywords [en]
galaxies: active, galaxies: high-redshift, galaxies: ISM, quasars: individual: SDSS J231038.88+185519.7, quasars: individual: ULAS J131911.29+095951.4
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-175955DOI: 10.1093/mnras/stz2410ISI: 000489288600074OAI: oai:DiVA.org:su-175955DiVA, id: diva2:1369302
Available from: 2019-11-11 Created: 2019-11-11 Last updated: 2019-12-09Bibliographically approved

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Vallini, Livia
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