Kavli IPMU

Nov 6, 2024 | academic.oup.com | Denys Wilkinson Building |Keble Road |Kavli IPMU

Much of the progress made so far in cosmological large-scale structure studies has been using tools that are only optimal for the study of Gaussian random fields, such as correlation functions and power spectra. There are good reasons for these: CMB observations have confirmed that the primordial density fluctuations were very close to Gaussian (Komatsu et al. 2003; Planck Collaboration VII 2020).

Oct 14, 2024 | academic.oup.com | Kavli IPMU

We present 5,080 white dwarf (WD) candidates selected from stars matching between the multi-band imaging datasets of the Subaru Hyper Suprime-Cam (HSC) Survey and the Sloan Digital Sky Survey (SDSS) in the Stripe82 region covering about 165 deg2. We select WD candidates from the “reduced proper motion” diagram by combining the apparent magnitude in the range i = 19 – 24 and the proper motion measured from the datasets among a baseline of ∼ 14 years.

Oct 3, 2024 | academic.oup.com | Space science |Kavli IPMU

Since the discovery of NGC 1052-DF2 (hereafter DF2) as a dark matter-deficient galaxy (DMDG) by van Dokkum et al. (2018b), the formation mechanisms of such galaxies have been widely debated. Shortly after its discovery, the accuracy of the distance measurement to DF2 was questioned by Trujillo et al. (2019). However, more recent data, based on 40 orbits of the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) observations, support a distance of approximately (Shen et al. 2021b).

Jul 12, 2024 | academic.oup.com | Kavli IPMU

How massive stars end their lives depends on the core mass, core angular momentum, and hydrogen envelopes at death. However, these key physical facets of stellar evolution can be severely affected by binary interactions. In turn, the effectiveness of binary interactions itself varies greatly depending on the initial conditions of the binaries, making the situation much more complex. We investigate systematically how binary interactions influence core-collapse progenitors and their fates.

May 25, 2024 | academic.oup.com | Kavli IPMU

We present a theoretical framework for linking quasar properties, such as quasar age, to the surrounding Lyα emission intensity. In particular, we focus on a method for mapping the large-scale structure of Lyα emission intensity with galaxy spectra from wide-field spectroscopic surveys, e.g., the Subaru Prime Focus Spectrograph (PFS) or the Dark Energy Spectroscopic Instrument (DESI), and consider the quasar-induced Lyα emission from the intergalactic medium (IGM).