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  The MOSDEF Survey: Kinematic and structural evolution of star-forming galaxies at 1.4 ≤ z ≤ 3.8

Price, S. H., Kriek, M., Barro, G., Shapley, A. E., Reddy, N. A., Freeman, W. R., et al. (2020). The MOSDEF Survey: Kinematic and structural evolution of star-forming galaxies at 1.4 ≤ z ≤ 3.8. The Astrophysical Journal, 894(2): 91. doi:10.3847/1538-4357/ab7990.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-A216-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-A88F-C
Genre: Journal Article

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The MOSDEF Survey Kinematic and Structural Evolution of Star-forming Galaxies at 1.4 z 3.8.pdf (Any fulltext), 3MB
 
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 Creators:
Price, Sedona H.1, Author              
Kriek, Mariska, Author
Barro, Guillermo, Author
Shapley, Alice E., Author
Reddy, Naveen A., Author
Freeman, William R., Author
Coil, Alison L., Author
Shivaei, Irene, Author
Azadi, Mojegan, Author
de Groot, Laura, Author
Siana, Brian, Author
Mobasher, Bahram, Author
Sanders, Ryan L., Author
Leung, Gene C. K., Author
Fetherolf, Tara, Author
Zick, Tom O., Author
Übler, Hannah1, Author              
Förster Schreiber, Natascha M.1, Author              
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: We present ionized gas kinematics for 681 galaxies at z∼1.4−3.8 from the MOSFIRE Deep Evolution Field survey, measured using models which account for random galaxy-slit misalignments together with structural parameters derived from CANDELS Hubble Space Telescope (HST) imaging. Kinematics and sizes are used to derive dynamical masses. Baryonic masses are estimated from stellar masses and inferred gas masses from dust-corrected star formation rates (SFRs) and the Kennicutt-Schmidt relation. We measure resolved rotation for 105 galaxies. For the remaining 576 galaxies we use models based on HST imaging structural parameters together with integrated velocity dispersions and baryonic masses to statistically constrain the median ratio of intrinsic ordered to disordered motion, V/σV,0 . We find that V/σV,0 increases with increasing stellar mass and decreasing specific SFR (sSFR). These trends may reflect marginal disk stability, where systems with higher gas fractions have thicker disks. For galaxies with detected rotation we assess trends between their kinematics and mass, sSFR, and baryon surface density (Σbar,e). Intrinsic dispersion correlates most with Σbar,e and velocity correlates most with mass. By comparing dynamical and baryonic masses, we find that galaxies at z∼1.4−3.8 are baryon dominated within their effective radii (RE), with Mdyn/Mbaryon increasing over time. The inferred baryon fractions within RE, fbar, decrease over time, even at fixed mass, size, or surface density. At fixed redshift, fbar does not appear to vary with stellar mass but increases with decreasing RE and increasing Σbar,e. For galaxies at z≥2, the median inferred baryon fractions generally exceed 100%. We discuss possible explanations and future avenues to resolve this tension.

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 Dates: 2020-05-08
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab7990
Other: LOCALID: 3240629
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 894 (2) Sequence Number: 91 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3