Today:
There are no scheduled talks today.
Upcoming:
Euler Characteristics and Anomaly Cancellation
Monica Jinwoo Kang
Mon, 23 Apr 2018, 14:00
Gravity matters: from gravitational waves to dark matter
Prof. Xavier Calmet
Mon, 23 Apr 2018, 16:30
Precision in EFT studies for top quark and Higgs physics
Eleni Vryonidou
Tue, 24 Apr 2018, 14:15

Characterizing Galaxy Assembly Histories in the Local Universe

Allison Merritt , MPIA


The Dragonfly Telephoto Array, composed of 48 individual Canon telephoto lenses operating together as a single telescope, is an innovative approach to low surface brightness imaging. Sub-nanometer coatings on each optical element reduce scattered light from nearby bright stars and compact galaxy centers -- typically a key obstacle for integrated light observations -- by an order of magnitude, and Dragonfly's large field of view (2 x 2.6 degrees for a single frame) provides a large-scale view of galactic stellar halos and satellite systems. Using extremely deep (>30 mag/arcsec^2) optical imaging in g and r bands from the Dragonfly Nearby Galaxies Survey (DNGS), we have characterized the stellar halos of a sample of nearby luminous galaxies. I will present measurements of the stellar halo mass fractions of an initial sample of Milky Way-mass spiral galaxies from the survey, and discuss these in the context of the assembly histories of individual galaxies. Finally, I will provide an overview of ongoing and upcoming Dragonfly projects which range from discoveries of extended low surface brightness galaxy disks, to characterizations of intra-group and intra-cluster light, to the detection and study of ultra diffuse galaxies and faint satellite galaxies both within and outside of clusters.
Königstuhl Colloquium
2 Mar 2018, 15:00
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

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