Abstract:
Intrinsic alignments (IA) of galaxy shapes refer to the physical correlations or alignments between orientations of galaxy shapes as a function of separations, rather than being in random orientations. IA has been indeed measured from actual data such as SDSS (e.g. Okumura & Jing 2009), and has been studied in detail as one of dominant contamination effects to cosmic shear cosmology. In this talk, I would like to discuss that IA can be used as a new cosmological probe, rather than a contaminating effect. For example, the IA power spectrum can be used to probe anisotropic primordial non-Gaussianity that is a smoking-gun signature of physics in the early universe (Akitsu et al. 2021). We also recently developed a new estimator of measuring the IA power spectrum from an actual data taking into account the line-of-sight dependent projection as well as the survey window effect (Kurita & Takada 2022). I will show some results, and any discussion/inputs are very much appreciated.

CV:
https://www.astr.tohoku.ac.jp/~takada/cv.html

Time:14:00-15:00PM, 27/Apr, Wednesday
Meeting ID: 831 4360 9634
Passcode: 436377
Joining Link: https://us02web.zoom.us/j/83143609634?pwd=K0tQcERUTzBldHp0emE0b