Abstract
We present a sub-100 pc-scale analysis of the CO molecular gas emission
and kinematics of the gravitational lens system SDP.81 at redshift 3.042
using Atacama Large Millimetre/submillimetre Array (ALMA) science
verification data and a visibility-plane lens reconstruction technique.
We find clear evidence for an excitation-dependent structure in the
unlensed molecular gas distribution, with emission in CO (5-4) being
significantly more diffuse and structured than in CO (8-7). The
intrinsic line luminosity ratio is r8-7/5-4 = 0.30 ±
0.04, which is consistent with other low-excitation starbursts at z
˜ 3. An analysis of the velocity fields shows evidence for a
star-forming disc with multiple velocity components that is consistent
with a merger/post-coalescence merger scenario, and a dynamical mass of
M(
Original language | English |
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Pages (from-to) | L26-L30 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 453 |
Issue number | 1 |
DOIs | |
Publication status | Published - 11-Oct-2015 |
Keywords
- gravitational lensing: strong
- galaxies: high redshift
- submillimetre: galaxies