Results 41 to 50 of about 3,417 (259)

The Initial Mass Function of the Galactic Early-type Field Stars Based on the LAMOST Survey

The Astrophysical Journal
Research on the high-mass end of the initial mass function (IMF) has been limited due to a scarcity of samples. Recently, Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), as the most efficient spectroscopic telescope, has provided new ...
Qida Li, Jianping Xiong, Zhenwei Li, Dan Qiu, Chao Liu, Zhanwen Han, Xuefei Chen   +6 more
doaj   +1 more source

A new scenario of galaxy evolution under a universal IMF

, 1997
In this paper, basic observational properties of elliptical galaxies such as the integrated spectra, the chemical abundances and the enhancement of $α$-elements inferred from broad-band colors and line strength indices $Mg_2$ and $< Fe >$ (and their gradients), the color-magnitude relation, the UV fluxes, and the mass-luminosity ratios, are ...
Chiosi, C., Bressan, A., Portinari, L., Tantalo, R.   +3 more
openaire   +2 more sources

Board Gender Diversity and Environmental Credit Risk in Banking: A Global Study of Bank Governance

Business Strategy and the Environment, EarlyView.
ABSTRACT This study investigates the relationship between board gender diversity and environmental credit risk in the global banking sector. Using a panel dataset of 345 publicly listed banks from 75 countries over the period 2018–2022, we find that greater female representation on bank boards is significantly associated with lower environmental credit
Kenza Mouti, Erhan Kilincarslan, Jiafan Li   +2 more
wiley   +1 more source

Statistical Investigations of the Radial Interplanetary Magnetic Field Component Impact on the Magnetotail Current Sheet Structure of Mars: MAVEN Observations

The Astrophysical Journal
In this study, we investigated the role of interplanetary magnetic field (IMF) orientation in controlling the location and structure of the current sheet (CS) in the Martian magnetotail.
Yuanzheng Wen, Zhaojin Rong, Hans Nilsson, Chi Zhang, Han-Wen Shen, Jiawei Gao   +5 more
doaj   +1 more source

Constraining the Initial Mass Function via Stellar Transients

Universe
The stellar initial mass function (IMF) represents a fundamental quantity in astrophysics and cosmology describing the mass distribution of stars from low mass all the way up to massive and very massive stars. It is intimately linked to a wide variety of
Francesco Gabrielli, Lumen Boco, Giancarlo Ghirlanda, Om Sharan Salafia, Ruben Salvaterra, Mario Spera, Andrea Lapi   +6 more
doaj   +1 more source

The cosmic evolution of the IMF under the Jeans conjecture with implications for massive galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
We examine the cosmic evolution of a stellar initial mass function (IMF) in galaxies that varies with the Jeans mass in the interstellar medium, paying particular attention to the Kband stellar mass to light ratio (M/LK) of present-epoch massive galaxies.
Narayanan, Desika, Dave, Romeel
openaire   +2 more sources

Innovation Pathways to Carbon Efficiency: Disentangling the Effects of AI, R&D, and Clean Energy Blessings on U.S. Environmental Sustainability

Business Strategy and the Environment, EarlyView.
ABSTRACT The United States (U.S.) faces challenges in achieving its ambitious net‐zero carbon emissions target by 2050, with current emissions having fallen by less than 1% in 2024. Despite an investment of $500 billion in low‐carbon resources while holding the second‐largest green technology patent portfolio globally, it is further imperative to ...
Md Zubair Ahmad, Jewel Rana, Mohammad Fakhrul Islam, Md Nazmul Islam Jihad, Md. Rashed, Md. Kamal Uddin   +5 more
wiley   +1 more source

The Sc, Ti, and V Abundance Discrepancy: Testing High-mass Initial Mass Function Variation and Massive-star Rotation

The Astrophysical Journal
Scandium, titanium, and vanadium can be synthesized primarily in massive stars. Yet many of the current Galactic chemical evolution (GCE) models underproduce these elements at early epochs.
Soonchul Choi, Eda Gjergo, Youngman Kim, Toshitaka Kajino   +3 more
doaj   +1 more source

The interplanetary magnetic field influences mid-latitude surface atmospheric pressure

Environmental Research Letters, 2013
The existence of a meteorological response in the polar regions to fluctuations in the interplanetary magnetic field (IMF) component B _y is well established.
M M Lam, G Chisham, M P Freeman
doaj   +1 more source

Poleward moving auroral forms (PMAFs) revisited: responses of aurorae, plasma convection and Birkeland currents in the pre- and postnoon sectors under positive and negative IMF B_y conditions [PDF]

Annales Geophysicae, 2007
Using five case studies, we investigate the dynamical evolution of dayside auroral precipitation in relation to plasma convection, classifying it by the IMF By component and position with respect to noon. Auroral observations were made by meridian
P. E. Sandholt, C. J. Farrugia
doaj   +1 more source