I am a postdoctoral fellow at Johns Hopkins University in Baltimore, Maryland, USA since late 2016. Prior to this, I briefly held a position at the University of Tokyo in Japan as a JSPS fellow. I received my Ph.D. in Astronomy from the University of Texas at Austin in the Spring of 2016. I grew up in Taiwan, where I received a B.S. in Computer Science with Physics minor and a M.S. in Astronomy from National Tsing Hua University.

Building Ancient Cosmic Cities

Galaxy Protoclusters are large overdense structures in the early Universe from which galaxy clusters gravitationally collapse. They represent an unique interface between the subjects of galaxy formation and cosmology, and a key laboratory to study both in their extreme conditions. A major part of my work has been pioneering the numerical modeling, observations, and physical inferences of protoclusters and their relations to both large and small scale astrophysics.

Dissecting The 3D Universe

Clustering Redshift Estimation is a powerful technique to perform tomographic analyses on many types of observables of the angular sky. Utilizing the fact that extragalactic objects are gravitationally clustered in the filamentary cosmic web, we can propagate information from a spatially 3D data set (the "reference" sample with RA, Dec, redshift available) to a 2D one (the "unknown"). This is achieved by a series of angular cross correlations. The applications include inferring the redshift distribution of photometrically selected galaxies, and deprojecting various cosmic intensity fields from 2D back to 3D.

Contact Information

Address:
3400 N. Charles Street
Baltimore, MD 21218
United States

Email:
ykchiang@jhu.edu

Research Gallery


Dissecting Galactic dust maps using angular cross-correlations with extragalactic objects
Visualizing the drastically evolving Lagrangian volumes of simulated galaxy protoclusters
Protoclusters are expected to be the key drivers of early cosmic star formation history and reionization
Three-stage scenario of galaxy cluster formation: inside-out, extended growth, and infalling
Discovery of a massive protocluster at z=2.44 in a blind Lya emitter search in the HETDEX Pilot Survey
Discovery of 36 protocluster candidates at z=2~3 using photometric redshifts in the COSMOS field
Mass and size evolution of protoclusters predicted in the Millennium simulation