Recent observations of dwarf galaxies have uncovered several tensions with cosmological predictions, such as
\nan unexpected spatial location around massive galaxies \u2011 the plane\u2011of\u2011satellite problem \u2011, a discrepant dark matter
\ncontent, and a higher than expected population of globular clusters. They add to other known problems
\nand challenge the otherwise highly successful \u039b + Cold Dark Matter (\u039bCDM) model of cosmology.<\/p>\n
Unfortunately, the detailed studies of dwarf galaxies are hampered by their low luminosities and low surface\u2011brightness
\nand have so far been limited to a few nearby galaxy groups, including our own Local Group.
\nUsing the Canada\u2011France\u2011Hawaii Telescope we observed over 200 fields around giant galaxies to an extremely
\ndeep surface brightness limit. With this data set, we identified an unprecedented number of 2210 dwarf galaxies.
\nAs follow\u2011up programs, we were granted 87 orbits with the HST in cycle 28 (Oct. 2020 \u2011 Sep. 2021) for a
\nsubsample of these dwarf galaxies, which represents the largest systematic study of dwarf galaxies with HST
\nto date. This data set will be accompanied with up to 99 hours of observation time from MUSE mounted at
\nthe VLT, as part of a snapshot program (Oct. 2020 \u2011 Apr. 2021). With this data set we will answer some pressing
\nquestions posed in our field of research: Is there a population of dark matter\u2011deficient dwarf galaxies with
\nextreme globular cluster systems? Do the properties of dwarf galaxies vary with their environment? Is there
\nmore evidence for co\u2011rotating planes of dwarf galaxies? This new data will increase the study of these objects
\nfrom a few to a statistically meaningful sample and will test if these challenges to our cosmological model will
\nremain or vanish.<\/p>\n
Our multi\u2011disciplinary team consists of researchers based in Europe (France, Austria, Netherlands, UK), the
\nUSA, South Africa, and South Korea. At the ISSI in Bern, we aim to bring our team together for the first time
\nface\u2011to\u2011face for two one\u2011week meetings. Our first planned ISSI meeting will focus on the scientific questions
\nregarding nearby dwarf galaxies, with a focus on the new HST and VLT data acquired in 2020\/21. The second
\nmeeting will enlarge the discussions around next-generation surveys, in particular, those to be carried out in
\nthe near future with Space missions such as Euclid. It will provide the opportunity to use the experience gained
\nfrom our ground and space\u2011based observations to adjust our strategy to exploit the new surveys and detect
\ntheir dwarf galaxies and globular cluster populations.<\/p>\n
With our project and proposed meetings at ISSI, we aim to get a deeper understanding of dwarf galaxies, combining
\na statistically significant sample of observed dwarf galaxies and their globular clusters with expertise in
\ngalaxy formation and cosmological simulations.<\/p>\n","protected":false},"excerpt":{"rendered":"
Recent observations of dwarf galaxies have uncovered several tensions with cosmological predictions, such as an unexpected spatial location around massive galaxies \u2011 the plane\u2011of\u2011satellite problem \u2011, a discrepant dark matter content, and a higher than expected population of globular clusters. They add to other known problems and challenge the otherwise highly successful \u039b + Cold […]<\/p>\n","protected":false},"author":34,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/teams.issibern.ch\/obervationdwarfgalaxies\/wp-json\/wp\/v2\/pages\/2","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/teams.issibern.ch\/obervationdwarfgalaxies\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/teams.issibern.ch\/obervationdwarfgalaxies\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/teams.issibern.ch\/obervationdwarfgalaxies\/wp-json\/wp\/v2\/users\/34"}],"replies":[{"embeddable":true,"href":"https:\/\/teams.issibern.ch\/obervationdwarfgalaxies\/wp-json\/wp\/v2\/comments?post=2"}],"version-history":[{"count":5,"href":"https:\/\/teams.issibern.ch\/obervationdwarfgalaxies\/wp-json\/wp\/v2\/pages\/2\/revisions"}],"predecessor-version":[{"id":17,"href":"https:\/\/teams.issibern.ch\/obervationdwarfgalaxies\/wp-json\/wp\/v2\/pages\/2\/revisions\/17"}],"wp:attachment":[{"href":"https:\/\/teams.issibern.ch\/obervationdwarfgalaxies\/wp-json\/wp\/v2\/media?parent=2"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}