Results 61 to 70 of about 1,066 (187)
A simple model of spiral galaxies from geometric optics
AIP AdvancesWe propose a simple model of spiral galaxies based on the interference of gravitational waves. The interference is deduced from geometric optics analysis of the refractive index profiles that mimic the behavior of gravitational potentials −1/r and r2. We
Bogdan Szafraniec, James N. Blake
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The Open Journal of Astrophysics, 2021 Countless low-surface brightness objects - including spiral galaxies, dwarf galaxies, and noise patterns - have been detected in recent large surveys.
Oliver Müller, Eva Schnider
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Statistical Survey of Cosmic Noise Absorption in Conjunction With Plasma Wave Measurements
Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.Abstract Using a decade of observations from the Canadian Geospace Observatory Riometer Network (GO‐RIO), we selected an east‐west subset of stations near L∼7 $L\sim 7$ to classify cosmic noise absorption (CNA) (a proxy for enhanced D‐region ionization) into two morphologies, simultaneous and drifting, based on the relative timing of signals across the
R. Ghaffari +3 more
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FORMATION AND MAINTENANCE OF SPIRAL STRUCTURE IN GALAXIES [PDF]
Symposium - International Astronomical Union, 1985 The formation and maintenance of spiral structure in galaxies is discussed in terms of spiral modes with a general perception consistent with the hypothesis of quasi-stationary spiral structure. The latter is explained in some detail to give it the original proper perspective and to contrast it with recent studies of non-stationary spiral structures ...
C. C. Lin, G. Bertin
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H i Gas and Star Formation in Major Galaxy Pairs from the FAST All Sky H i Survey (FASHI)
The Astrophysical JournalAtomic hydrogen (H i ) plays a fundamental role in fueling star formation in galaxies. However, the behavior of H i gas in interacting systems, particularly galaxy pairs, remains elusive.
Shulan Yan +8 more
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The Identification of a Dusty Multiarm Spiral Galaxy at z = 3.06 with JWST and ALMA
The Astrophysical Journal Letters, 2022 Spiral arms serve crucial purposes in star formation and galaxy evolution. In this paper, we report the identification of “A2744-DSG- z 3,” a dusty, multiarm spiral galaxy at z = 3.059 using the James Webb Space Telescope (JWST) NIRISS imaging and grism ...
Yunjing Wu +15 more
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Advanced Materials Technologies, Volume 11, Issue 13, 8 July 2026.This review explores advances in wearable and lab‐on‐chip technologies for breast cancer detection. Covering tactile, thermal, ultrasound, microwave, electrical impedance tomography, electrochemical, microelectromechanical, and optical systems, it highlights innovations in flexible electronics, nanomaterials, and machine learning.
Neshika Wijewardhane +4 more
wiley +1 more source
Rotation Curves of 967 Spiral Galaxies [PDF]
The Astrophysical Journal Supplement Series, 1995 We present the rotation curves (RCs) of 967 spiral galaxies, obtained by folding and deprojecting the raw optical data by Mathewson et al. (1992). Out of these, we have identified 80 excellent RCs and 820 fair RCs. The 80 excellent RCs are smooth, symmetric, have negligible rms internal error, extend to at least the optical radius, and have high and ...
Persic, M., Salucci, P.
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Spiral Arms across Cosmic Time: JWST Measurements of the Pitch Angles of Spiral Galaxies at z < 3.5
The Astrophysical JournalThe properties of spiral galaxies in the early Universe remain poorly studied, and as such, little is known about their nature and evolution. We use JWST data to measure the pitch angles of spiral galaxies across cosmic time.
Vicki Kuhn +6 more
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The Study of Nebular Emission on Nearby Spiral Galaxies in the IFU Era
Advances in Astronomy, 2013 A new generation of wide-field emission-line surveys based on integral field units (IFU) is allowing us to obtain spatially resolved information of the gas-phase emission in nearby late-type galaxies, based on large samples of HII regions and full two ...
Fernando Fabián Rosales-Ortega
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