Multiwavelength Characterization of an ACT-selected, Lensed Dusty Star-forming Galaxy at z = 2.64
| Autor: | Megan Gralla, Nicolas Laporte, Axel Weiß, Matt Hilton, G. W. Wilson, Katherine Alatalo, Federico Nati, John P. Hughes, Andrew J. Baker, Itziar Aretxaga, J. Álvarez-Márquez, Tobias A. Marriage, A. Sievers, Edward J. Wollack, M. Daprà, M. S. Yun, Jesus Rivera, Seiji Fujimoto, C. Jiménez, Guido Roberts-Borsani, M. J. Jimenez-Donaire, Patricio A. Gallardo |
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| Přispěvatelé: | Roberts-Borsani, G, Jiménez-Donaire, M, Daprà, M, Alatalo, K, Aretxaga, I, Álvarez-Márquez, J, Baker, A, Fujimoto, S, Gallardo, P, Gralla, M, Hilton, M, Hughes, J, Jiménez, C, Laporte, N, Marriage, T, Nati, F, Rivera, J, Sievers, A, Weiß, A, Wilson, G, Wollack, E, Yun, M |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Star (game theory)
FOS: Physical sciences High density Multiwavelength Characterization Star-forming Galaxy Astrophysics 01 natural sciences Spectral line high-redshift 0103 physical sciences 010303 astronomy & astrophysics ISM Line (formation) Physics 010308 nuclear & particles physics Galaxies: evolution Astronomy and Astrophysics jets and outflows radio lines Astrophysics - Astrophysics of Galaxies Galaxy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Content (measure theory) Anomaly (physics) Excitation |
| Popis: | We present \ci\,(2--1) and multi-transition $^{12}$CO observations of a dusty star-forming galaxy, ACT\,J2029+0120, which we spectroscopically confirm to lie at $z$\,=\,2.64. We detect CO(3--2), CO(5--4), CO(7--6), CO(8--7), and \ci\,(2--1) at high significance, tentatively detect HCO$^{+}$(4--3), and place strong upper limits on the integrated strength of dense gas tracers (HCN(4--3) and CS(7--6)). Multi-transition CO observations and dense gas tracers can provide valuable constraints on the molecular gas content and excitation conditions in high-redshift galaxies. We therefore use this unique data set to construct a CO spectral line energy distribution (SLED) of the source, which is most consistent with that of a ULIRG/Seyfert or QSO host object in the taxonomy of the \textit{Herschel} Comprehensive ULIRG Emission Survey. We employ RADEX models to fit the peak of the CO SLED, inferring a temperature of T$\sim$117 K and $n_{\text{H}_2}\sim10^5$ cm$^{-3}$, most consistent with a ULIRG/QSO object and the presence of high density tracers. We also find that the velocity width of the \ci\ line is potentially larger than seen in all CO transitions for this object, and that the $L'_{\rm C\,I(2-1)}/L'_{\rm CO(3-2)}$ ratio is also larger than seen in other lensed and unlensed submillimeter galaxies and QSO hosts; if confirmed, this anomaly could be an effect of differential lensing of a shocked molecular outflow. Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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