Results 121 to 130 of about 510,650 (316)

Can We Discover Physical Models Using Machine Learning? A Case Study of Galaxy Sizes

The Astrophysical Journal
We explore the ability of machine learning methods to discover underlying equations of physics by searching for the equations governing galaxy size in a semianalytic model. This case study allows us to evaluate the process as we know the ground truth. We
Festa Buçinca-Çupallari, Ariyeh H. Maller, Viviana Acquaviva, Austen Gabrielpillai, Rachel S. Somerville   +4 more
doaj   +1 more source

Near-IR TRGB Distance to Dwarf Elliptical Galaxy NGC 147 [PDF]

Journal of Astronomy and Space Sciences, 2007
We report the distance modulus of nearby dwarf elliptical galaxy NGC 147 estimated from the Tip of Red-giant Branch (TRGB) method applying to the color-magnitude diagrams and luminosity functions in the near-infrared JHK bands.
A. Kang, J.-W. Kim, I.-G. Shin, S.-H. Chun, H.-I. Kim, Y.-J. Sohn   +5 more
doaj   +1 more source

Full-sky ray-tracing simulation of weak lensing using ELUCID simulations: exploring galaxy intrinsic alignment and cosmic shear correlations

, 2018
The intrinsic alignment of galaxies is an important systematic effect in weak-lensing surveys, which can affect the derived cosmological parameters. One direct way to distinguish different alignment models and quantify their effects on the measurement is
Cui, Weiguang, Jing, Yipeng, Kang, Xi, Li, Guoliang, Li, Shijie, Lim, S. H., Lin, Weipeng, Lu, Yi, Luo, Yu, Mo, Houjun, Tweed, Dylan, Wang, Huiyuan, Wang, Peng, Wang, Yang, Wei, Chengliang, Xia, Qianli, Yang, Xiaohu, Zhang, Youcai   +17 more
core   +1 more source

In Situ Analysis of Jupiter's Broadband Kilometric Auroral Radio Emissions With Juno

Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.
Abstract Among the zoo of Jovian auroral radio emissions, the broadband kilometric (bKOM) component has been the least studied. Taking advantage of Juno in situ measurements within the auroral regions, we surveyed the Juno/Waves radio observations over the 60 first orbits to identify 7 bKOM source candidates.
B. Collet, L. Lamy, C. K. Louis, V. Hue, T. K. Kim   +4 more
wiley   +1 more source

Chandra Evidence of a Flattened, Triaxial Dark Matter Halo in the Elliptical Galaxy NGC 720 [PDF]

, 2002
We present an analysis of a Chandra ACIS-S observation of the elliptical galaxy NGC 720, to verify the existence of a dark matter halo and to measure its ellipticity.
D. Buote, T. Jeltema, C. Canizares, G. Garmire   +3 more
semanticscholar   +1 more source

Selection of Biofortified Sweet Potato (Ipomoea batatas L.) Genotypes in Response to Drought Stress

Journal of Agronomy and Crop Science, Volume 211, Issue 3, May 2025.
ABSTRACT The development of orange‐ and purple‐fleshed sweet potato genotypes with high nutritional quality and drought tolerance is paramount in the face of climate changes and exponential human population growth. Therefore, the objective was to select biofortified sweet potato genotypes tolerant to drought. Eight progenies developed by the NEOSC‐UFSC
Antonio Nunes de Andrade, Juliane Maciel Henschel, Damiana Justino Araújo, Daniel da Silva Gomes, Tatiana Dantas da Silva, Vanessa de Azevedo Soares, Estephanni Fernanda Oliveira Dantas, Adriano Salviano Lopes, André Dutra Silva Júnior, André Ricardo Zeist, Diego Silva Batista   +10 more
wiley   +1 more source

Stellar populations in gas-rich galaxy mergers I. Dependence on star formation history

, 1998
We investigate the nature of stellar populations of major galaxy mergers between late-type spirals considerably abundant in interstellar medium by performing numerical simulations designed to solve both the dynamical and chemical evolution in a self ...
Bekki, Kenji, Shioya, Yasuhiro
core   +1 more source

Volume measurement of microparticles using SEM photogrammetry and 3‐D reconstruction

Meteoritics &Planetary Science, Volume 60, Issue 5, Page 1227-1235, May 2025.
Abstract In this paper, we introduce a method for volume measurement of microparticles that includes scanning electron microscope photogrammetry with 3‐D model construction. Our results show that our method limits the volume uncertainty to ±10%, which is a significant improvement compared to previous methods (which likely overestimated volume by 100 ...
Y. Zheng, X. Yang, M. Valdes, A. M. Davis, P. R. Heck   +4 more
wiley   +1 more source

High resolution soft x-ray spectroscopy of the elliptical galaxy NGC 5044. Results from the reflection grating spectrometer on-board XMM-Newton [PDF]

, 2002
The results from an X-ray spectroscopic study of the giant elliptical galaxy NGC 5044 in the center of a galaxy group are presented. The line dominated soft X-ray spectra (mainly Fe-L and $\ion{O}{viii}$ ${\rm Ly\alpha}$) from the diffuse gas are ...
T. Tamura, J. Kaastra, K. Makishima, I. Takahashi   +3 more
semanticscholar   +1 more source

The Stellar Kinematics of Elliptical Galaxies [PDF]

Symposium - International Astronomical Union, 1987
The kinematic properties of elliptical galaxies are summarized. New developments are discussed in four areas: (i) the Faber-Jackson relation and the role of second parameters (ii) the luminosity-rotation relation (iii) the figures of elliptical galaxies and (iv) the mass-to-light ratio as a function of radius.
openaire   +3 more sources