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Journal Article

The Atacama Cosmology Telescope: CO(J = 3 ─ 2) Mapping and Lens Modeling of an ACT-selected Dusty Star-forming Galaxy

MPS-Authors

Rivera,  Jesus
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Baker,  Andrew J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gallardo,  Patricio A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gralla,  Megan B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Harris,  Andrew I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Huffenberger,  Kevin M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hughes,  John P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Keeton,  Charles R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

López-Caraballo,  Carlos H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Marriage,  Tobias A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Partridge,  Bruce
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sievers,  Jonathan L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tagore,  Amitpal S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Walter,  Fabian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Weiß,  Axel
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wollack,  Edward J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019ApJ...879...95R
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Citation

Rivera, J., Baker, A. J., Gallardo, P. A., Gralla, M. B., Harris, A. I., Huffenberger, K. M., et al. (2019). The Atacama Cosmology Telescope: CO(J = 3 ─ 2) Mapping and Lens Modeling of an ACT-selected Dusty Star-forming Galaxy. The Astrophysical Journal, 879.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CFF0-3
Abstract
We report Northern Extended Millimeter Array CO(J = 3 − 2) observations of the dusty star-forming galaxy ACT-S J020941+001557 at z = 2.5528, which was detected as an unresolved source in the Atacama Cosmology Telescope (ACT) equatorial survey. Our spatially resolved spectral line data support the derivation of a gravitational lens model from 37 independent velocity channel maps using a pixel-based algorithm, from which we infer a velocity-dependent magnification factor μ ≈ 7─22 with a luminosity-weighted mean ≤ft< μ \right> ≈ 13. The resulting source-plane reconstruction is consistent with a rotating disk, although other scenarios cannot be ruled out by our data. After correction for lensing, we derive a line luminosity {L}CO(3-2)}{\prime }=(5.53+/- 0.69)× {10}10 {{K}} {km} {{{s}}}-1 {pc}}2, a cold gas mass {M}gas}=(3.86+/- 0.33)× {10}10 {M}ȯ , a dynamical mass {M}dyn} {\sin }2 i={3.9}-1.5+1.8× {10}10 {M}ȯ , and a gas mass fraction {f}gas} {\csc }2 i={1.0}-0.4+0.8. The line brightness temperature ratio of r 3,1 ≈ 1.6 relative to a Green Bank Telescope CO(J = 1 − 0) detection may be elevated by a combination of external heating of molecular clouds, differential lensing, and/or pointing errors.