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Constraints on high-J CO emission lines in z similar to 6 quasars
Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy..
Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands..
Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy.;Museo Stor Fis, Ctr Fermi, Piazza Viminale 1, I-00184 Rome, Italy.;Ctr Studi & Ric Enrico Fermi, Piazza Viminale 1, I-00184 Rome, Italy..
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2019 (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
OXFORD UNIV PRESS , 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:kth:diva-262934DOI: 10.1093/mnras/stz2410ISI: 000489288600074OAI: oai:DiVA.org:kth-262934DiVA, id: diva2:1366110
Note

QC 20191028

Available from: 2019-10-28 Created: 2019-10-28 Last updated: 2019-10-28Bibliographically approved

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