ALMA view of RX J1131-1231: Sub-kpc CO (2-1) mapping of a molecular disk in a lensed star-forming quasar host galaxy
ALMA view of RX J1131-1231: Sub-kpc CO (2-1) mapping of a molecular disk in a lensed star-forming quasar host galaxy
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RX J1131-1231 的 ALMA 视图:透镜状恒星形成类星体宿主星系中分子盘的亚 kpc CO (2-1) 映射
DOI:
10.1051/0004-6361/201731250
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发表时间:
2018
影响因子:
6.5
通讯作者:
Fassnacht, C. D.
中科院分区:
文献类型:
--
作者:
Paraficz, D.;Rybak, M.;McKean, J. P.;Vegetti, S.;Sluse, D.;Courbin, F.;Stacey, H. R.;Suyu, S. H.;Dessauges-Zavadsky, M.;Fassnacht, C. D.
We present ALMA 2-mm continuum and CO (2-1) spectral line imaging of the gravitationally lensedz= 0.654 star-forming/quasar composite RX J1131-1231 at 240–400 mas angular resolution. The continuum emission is found to be compact and coincident with the optical emission, whereas the molecular gas forms a complete Einstein ring, which shows strong differential magnification. The de-lensed source structure is determined on 400-parsec-scales resolution using a Bayesian pixelated visibility-fitting lens modelling technique. The reconstructed molecular gas velocity-field is consistent with a large rotating disk with a major-axis FWHM ~9.4 kpc at an inclination angle ofi= 54° and with a maximum rotational velocity of 280 km s−1. From dynamical model fitting we find an enclosed mass within 5 kpc ofM(r< 5 kpc) = (1.46 ± 0.31) × 1011M⊙. The molecular gas distribution is highly structured, with clumps that are co-incident with higher gas velocity dispersion regions (40–50 km s−1) and with the intensity peaks in the optical emission, which are associated with sites of on-going turbulent star-formation. The peak in the CO (2-1) distribution is not co-incident with the AGN, where there is a paucity of molecular gas emission, possibly due to radiative feedback from the central engine. The intrinsic molecular gas luminosity isL′CO= 1.2 ± 0.3 × 1010K km s−1pc2and the inferred gas mass isMH2= 8.3 ± 3.0 × 1010M⊙, which given the dynamical mass of the system is consistent with a CO–H2conversion factor ofα= 5.5 ± 2.0M⊙(K km s−1pc2)−1. This suggests that the star-formation efficiency is dependent on the host galaxy morphology as opposed to the nature of the AGN. The far-infrared continuum spectral energy distribution shows evidence for heated dust, equivalent to an obscured star-formation rate of SFR = 69−25+41× (7.3/μIR)M⊙yr−1, which demonstrates the composite star-forming and AGN nature of this system.
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DOI:
10.1086/589830
发表时间:
2008
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
D. Frayer;Jin Koda;A. Pope;Minh Huynh;R. Chary;D. Scott;M. Dickinson;D. C. Bock;John M. Carpenter;D. Hawkins;M. Hodges;James W. Lamb;R. Plambeck;M. Pound;S. Scott;N. Scoville;D. Woody
通讯作者:
D. Woody
DOI:
10.1088/0004-637x/709/1/278
发表时间:
2009-06
期刊:
The Astrophysical Journal
影响因子:
--
作者:
X. Dai;C. Kochanek;G. Chartas;S. Kozłowski;C. Morgan;G. Garmire;E. I. O. Astronomy;U. Michigan
通讯作者:
X. Dai;C. Kochanek;G. Chartas;S. Kozłowski;C. Morgan;G. Garmire;E. I. O. Astronomy;U. Michigan
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
D. Sluse;J. Claeskens;B. Altieri;R. Cabanac;O. Garcet;D. Hutsemékers;C. Jean;A. Smette;J. Surdej
通讯作者:
J. Surdej
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
G. Chartas;C. S. Kochanek;X. Dai;D. Moore;A. Mosquera;J. Blackburne
通讯作者:
J. Blackburne
DOI:
--
发表时间:
2007
期刊:
to appear in Kodai Mathematical Journal
影响因子:
--
作者:
N.Kato;S.Oharu;K.Shitaoka;T.Nakanisi
通讯作者:
T.Nakanisi