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  Merger-driven star formation activity in Cl J1449+0856 at z = 1.99 as seen by ALMA and JVLA

Coogan, R. T., Daddi, E., Sargent, M. T., Strazzullo, V., Valentino, F., Gobat, R., et al. (2018). Merger-driven star formation activity in Cl J1449+0856 at z = 1.99 as seen by ALMA and JVLA. Monthly Notices of the Royal Astronomical Society, 479, 703-729.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CE3E-F Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CE3F-E
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018MNRAS.479..703C (Any fulltext)
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 Creators:
Coogan, R. T.1, Author
Daddi, E.1, Author
Sargent, M. T.1, Author
Strazzullo, V.1, Author
Valentino, F.1, Author
Gobat, R.1, Author
Magdis, G.1, Author
Bethermin, M.1, Author
Pannella, M.1, Author
Onodera, M.1, Author
Liu, D.1, Author
Cimatti, A.1, Author
Dannerbauer, H.1, Author
Carollo, M.1, Author
Renzini, A.1, Author
Tremou, E.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: clusters: individual: Cl J1449+0856 galaxies: evolution galaxies: high-redshift galaxies: ISM galaxies: star formation Astrophysics - Astrophysics of Galaxies
 Abstract: We use Atacama Large Millimetre Array and Jansky Very Large Array observations of the galaxy cluster Cl J1449+0856 at z = 1.99, in order to study how dust-obscured star formation, interstellar medium content, and active galactic nuclei activity are linked to environment and galaxy interactions during the crucial phase of high-z cluster assembly. We present detections of multiple transitions of 12CO, as well as dust continuum emission detections from 11 galaxies in the core of Cl J1449+0856. We measure the gas excitation properties, star formation rates, gas consumption timescales, and gas-to-stellar mass ratios for the galaxies. We find evidence for a large fraction of galaxies with highly excited molecular gas, contributing >50 per cent to the total star formation rate (SFR) in the cluster core. We compare these results with expectations for field galaxies, and conclude that environmental influences have strongly enhanced the fraction of excited galaxies in this cluster. We find a dearth of molecular gas in the galaxies' gas reservoirs, implying a high star formation efficiency (SFE) in the cluster core, and find short gas depletion timescales τdep < 0.1-0.4 Gyr for all galaxies. Interestingly, we do not see evidence for increased specific SFRs (sSFRs) in the cluster galaxies, despite their high SFEs and gas excitations. We find evidence for a large number of mergers in the cluster core, contributing a large fraction of the core's total star formation compared with expectations in the field. We conclude that the environmental impact on the galaxy excitations is linked to the high rate of galaxy mergers, interactions, and active galactic nuclei in the cluster core.

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 Dates: 2018
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 479 Sequence Number: - Start / End Page: 703 - 729 Identifier: -