CHIME will use Intensity Mapping of the 21cm line of neutral hydrogen to map
large-scale structure between redshifts of 0.8 and 2.5. By measuring Baryon
Acoustic Oscillations (BAO) we will place constraints on the dark energy
equation of state as it begins to dominate the expansion of the Universe,
particularly at redshifts poorly probed by current BAO surveys.
In this talk I will introduce CHIME, a transit radio interferometer designed
specifically for this goal. I will discuss the promise and pitfalls of
Intensity Mapping and describe how we plan to confront the many challenges of
such observations, in particular removal of astrophysical foregrounds which are
six orders of magnitude larger than the 21cm signal.
Finally I will discuss our first intensity mapping science results: cross correlation
measurements against eBOSS spectroscopic catalogs. This is the first detection
of intensity mapping by an interferometer and the highest redshift measurements
of large scale structure by 21cm. We have significant detections of all three tracers:
LRGs, ELGs and quasars, and I will discuss the modelling and our interpretation
of the results.
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2021-10-28T16:00:002021-10-28T17:00:00First detection of cosmological signal with CHIMEEvent Information:
CHIME will use Intensity Mapping of the 21cm line of neutral hydrogen to map
large-scale structure between redshifts of 0.8 and 2.5. By measuring Baryon
Acoustic Oscillations (BAO) we will place constraints on the dark energy
equation of state as it begins to dominate the expansion of the Universe,
particularly at redshifts poorly probed by current BAO surveys.
In this talk I will introduce CHIME, a transit radio interferometer designed
specifically for this goal. I will discuss the promise and pitfalls of
Intensity Mapping and describe how we plan to confront the many challenges of
such observations, in particular removal of astrophysical foregrounds which are
six orders of magnitude larger than the 21cm signal.
Finally I will discuss our first intensity mapping science results: cross correlation
measurements against eBOSS spectroscopic catalogs. This is the first detection
of intensity mapping by an interferometer and the highest redshift measurements
of large scale structure by 21cm. We have significant detections of all three tracers:
LRGs, ELGs and quasars, and I will discuss the modelling and our interpretation
of the results.Event Location:
Hennings 201 (or via zoom)