Search Publications
Spirality: A Novel Way to Measure Spiral Arm Pitch Angle
Davis, Benjamin L.; Boe, Benjamin; Kennefick, Daniel +7 more
We present the MATLAB code Spirality, a novel method for measuring spiral arm pitch angles by fitting galaxy images to spiral templates of known pitch. Computation time is typically on the order of 2 min per galaxy, assuming 8 GB of working memory. We tested the code using 117 synthetic spiral images with known pitches, varying both the spiral pro…
Cosmological Model Tests with JWST
Lovyagin, Nikita; Raikov, Alexander; Yershov, Vladimir +1 more
The James Webb Space Telescope (JWST), which has recently become operational, is capable of detecting objects at record-breaking redshifts, z≳15. This is a crucial advance for observational cosmology, as at these redshifts the differences between alternative cosmological models manifest themselves in the most obvious way. In recent years, some obs…
The Accreting White Dwarfs in Cataclysmic Variables
Sion, Edward M.; Godon, Patrick
Accreting white dwarfs (WDs) in cataclysmic variables (CVs) provide crucial insights about the accretion of mass and angular momentum in all types of binaries, including accreting NSs and BHs. Accreting WDs are the critical component in the single degenerate pathway to SNe Ia, along with the double degenerate merger pathway, they are the standard …
Plasma Diagnostics in the Era of Integral Field Spectroscopy
Ueta, Toshiya
To understand the physical conditions of various gaseous systems, plasma diagnostics must be performed properly. To that end, it is equally important to have extinction correction performed properly, even before performing plasma diagnostics. This means that the physical conditions of the target sources—the very quantities to be derived via plasma…
On Low Hubble Expansion Rate from Planck Data Anomalies
Capistrano, Abraão J. S.; Cabral, Luís A.; Marão, José A. P. F. +1 more
From the linear perturbations of Nash–Greene fluctuations of a background metric, we obtain profiles of Hubble function evolution H(z) and fσ8(z) measurements as compared with the ΛCDM results at intermediate redshifts 0.1<z<1. For parameter estimation, we use joint data from Planck Cosmic Microwave Background (CMB) likelihoods of CMB temper…