Bibcode
Coogan, R. T.; Daddi, E.; Sargent, M. T.; Strazzullo, V.; Valentino, F.; Gobat, R.; Magdis, G.; Bethermin, M.; Pannella, M.; Onodera, M.; Liu, D.; Cimatti, A.; Dannerbauer, H.; Carollo, M.; Renzini, A.; Tremou, E.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 479, Issue 1, p.703-729
Fecha de publicación:
9
2018
Número de citas
72
Número de citas referidas
63
Descripción
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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Helmut
Dannerbauer