Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 863, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aad6de
Keywords
galaxies: clusters: individual (1ES0657-558); galaxies: evolution; galaxies: ISM; gravitational lensing: strong; submillimeter: galaxies
Categories
Funding
- PROGRAMA UNAM-DGAPA-PAPIIT [IA102517]
- FONDECYT [1171710]
- CONICYT Chile (CONICYT-PCHA/Doctorado-Nacional) [2014-21140483]
- Chinese Academy of Sciences (CAS)
- National Commission for Scientific and Technological Research of Chile (CONICYT) through a CAS-CONICYT Joint Postdoctoral Fellowship
- STFC
- CONICYT Astronomy Program, project ALMA-CONICYT Support Astronomer Fund [31AS00002]
- CONICYT/FONDECYT [3160674]
- ADS/JAO.ALMA [2012.1.00261.S, 2015.1.01559.S]
- STFC [ST/M000907/1] Funding Source: UKRI
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We present Atacama Large Millimeter/submillimeter Array measurements of the Cosmic Seagull, a strongly magnified galaxy at z. = .2.7779 behind the Bullet Cluster. We report CO(3-2) and continuum 344 mu m (rest-frame) data at one of the highest differential magnifications ever recorded at submillimeter wavelengths (mu up to similar to 50), facilitating a characterization of the kinematics of a rotational curve in great detail (at similar to 620 pc resolution in the source plane).. We find no evidence for a decreasing rotation curve, from which we derive a dynamical mass of. (6.3. +/-. 0.7). x. 10(10) M-circle dot within r = 2.6. +/-. 0.1 kpc.. The discovery of a third, unpredicted, image. provides key information for a future improvement of the lensing modeling of the Bullet Cluster and allows a. measure of the stellar mass, 1.6(-0.86)(+1.9) x 10(10) M-circle dot,. unaffected by strong differential magnification. The baryonic mass is. expected to be dominated by the molecular gas content (f(gas) <= 80 +/- 20%). based on an M-H2 mass estimated from the difference between dynamical and stellar masses. The star formation rate (SFR) is estimated via the spectral energy distribution (SFR = 190 +/- 10 M-circle dot yr(-1)), implying a molecular gas depletion time of 0.25 +/- 0.08 Gyr.
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