Bibcode
Dannerbauer, H.
Referencia bibliográfica
Linking Galaxies from the Epoch of Initial Star Formation to Today. Proceedings of the 2019 Elizabeth and Frederick White Research Conference held 18-22 February, 2019. Online at <A ref="https://www.aao.gov.au/conference/australia-eso-conference-2019">https:…;, id.89
Advertised on:
2
2019
Número de citas
0
Número de citas referidas
0
Descripción
It is clear that galaxies in local clusters are different from those in
the field. Environment must play an important role in shaping the
ensemble of galaxies. However, we do not yet know when these physical
processes are initiated and what mechanisms directly impact how galaxies
evolve. We are using the Australian Telescope Compact Array (ATCA) to
study the role of environment on the molecular gas content, the fuel of
star formation, of distant star-forming galaxies. These are the likely
progenitors of elliptical galaxies which dominate the light in local
galaxy clusters. From our pilot survey to search for low-surface
brightness cold CO(1-0) molecular gas emission, I present the discovery
of massive extended CO gas reservoirs in these star-forming galaxies
that are located in the galaxy cluster in formation surrounding the
radio galaxy, MRC1138-262, the so-called Spiderweb protocluster, at
z=2.2. The discovery is unexpected as gas truncation and stripping was
predicted. Our results alter our view of the important topics of the
development and gas phase distribution of the "proto-intracluster
medium": how ram pressure stripping may operate in galaxy protoclusters,
how the galaxies may contribute to enriching and heating the
proto-intracluster medium, and how their star formation may be limited
by their internal dynamics. Furthermore, I will present results of our
on-going ATCA Large Program, CO ATCA Legacy Archive of Star-Forming
Galaxies (COALAS), based on our successful pilot survey. Our sample
consists of well-covered 'field'-targets from the ALMA survey ALESS in
the ECDFS and protocluster galaxies surrounding the Spiderweb. This
survey significantly extends our study of how environment impact the
cold molecular gas content, gas excitation and star-formation efficiency
in cluster and field galaxies in the early universe. Currently, the ATCA
is the only interferometer in the southern hemisphere that can target at
high redshift the ground-transition CO(1-0), the most robust tracer of
the overall cold molecular gas mass and distribution. Thus the ATCA is a
crucial complement to ALMA. Our ATCA data are complemented by exquisite
multi-wavelength data from the ESO telescopes and ALMA, thus
demonstrating the strong synergy between facilities from ESO and
Australia and the close collaboration between both communities.