Search Results for author: Ue-Li Pen

Found 8 papers, 6 papers with code

Galaxy Spin Classification I: Z-wise vs S-wise Spirals With Chirality Equivariant Residual Network

1 code implementation9 Oct 2022 He Jia, Hong-Ming Zhu, Ue-Li Pen

The angular momentum of galaxies (galaxy spin) contains rich information about the initial condition of the Universe, yet it is challenging to efficiently measure the spin direction for the tremendous amount of galaxies that are being mapped by the ongoing and forthcoming cosmological surveys.

Data Augmentation

HI constraints from the cross-correlation of eBOSS galaxies and Green Bank Telescope intensity maps

no code implementations9 Feb 2021 Laura Wolz, Alkistis Pourtsidou, Kiyoshi W. Masui, Tzu-Ching Chang, Julian E. Bautista, Eva-Maria Mueller, Santiago Avila, David Bacon, Will J. Percival, Steven Cunnington, Chris Anderson, Xuelei Chen, Jean-Paul Kneib, Yi-Chao Li, Yu-Wei Liao, Ue-Li Pen, Jeffrey B. Peterson, Graziano Rossi, Donald P. Schneider, Jaswant Yadav, Gong-Bo Zhao

We present the joint analysis of Neutral Hydrogen (HI) Intensity Mapping observations with three galaxy samples: the Luminous Red Galaxy (LRG) and Emission Line Galaxy (ELG) samples from the eBOSS survey, and the WiggleZ Dark Energy Survey sample.

Cosmology and Nongalactic Astrophysics

Interstellar Interferometry: Precise Curvature Measurement from Pulsar Secondary Spectra

1 code implementation12 Jan 2021 Daniel Baker, Walter Brisken, Marten H. van Kerkwijk, Robert Main, Ue-Li Pen, Tim Sprenger, Olaf Wucknitz

As a result, measuring variations in the curvature over the course of a year, or the orbital period for pulsars in binaries, can constrain properties of the screen and pulsar.

Instrumentation and Methods for Astrophysics

The Cross-correlation of KSZ Effect and 21 cm Intensity Mapping with Tidal Reconstruction

1 code implementation12 Nov 2018 Dongzi Li, Hong-Ming Zhu, Ue-Li Pen

We discuss the possibility of studying diffuse baryon distributions with kinematic Sunyaev-Zel'dovich (kSZ) effect by correlating cosmic microwave background (CMB) temperature fluctuations with density fluctuations from 21\, cm intensity mapping (IM).

Cosmology and Nongalactic Astrophysics

Coaxing Cosmic 21cm Fluctuations from the Polarized Sky using m-mode Analysis

1 code implementation9 Jan 2014 J. Richard Shaw, Kris Sigurdson, Michael Sitwell, Albert Stebbins, Ue-Li Pen

In this paper we continue to develop the m-mode formalism, a technique for efficient and optimal analysis of wide-field transit radio telescopes, targeted at 21 cm cosmology.

Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics

Pulsar scintillations from corrugated reconnection sheets in the ISM

1 code implementation7 Feb 2013 Ue-Li Pen, Yuri Levin

In this picture, the parts of warm ionized interstellar medium that are responsible for the scintillations are relatively quiescent, with scintillation and scattering resulting from weak waves propagating along magnetic domain boundary current sheets, which are both expected from helicity conservation and have been observed in numerical simulations.

Astrophysics of Galaxies

All-Sky Interferometry with Spherical Harmonic Transit Telescopes

1 code implementation2 Feb 2013 J. Richard Shaw, Kris Sigurdson, Ue-Li Pen, Albert Stebbins, Michael Sitwell

In this paper we describe the spherical harmonic transit telescope, a novel formalism for the analysis of transit radio telescopes.

Cosmology and Nongalactic Astrophysics

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