Results 11 to 20 of about 52,634 (236)

An X‐Ray Minisurvey of Nearby Edge‐on Starburst Galaxies. II. The Question of Metal Abundance [PDF]

, 2000
(abbreviated) We have undertaken an X-ray survey of a far-infrared flux limited sample of seven nearby edge-on starburst galaxies. Here, we examine the two X-ray-brightest sample members NGC 253 and M 82 in a self-consistent manner, taking account of the
Kimberly A. Weaver, Timothy M. Heckman, Michael Dahlem   +2 more
openalex   +4 more sources

Retracted: Can the chemical industry solve the climate change?On the role of human energy production, renewable energies, and the potential of chemistry as a solution provider

Chemie Ingenieur Technik, EarlyView., 2023
Let us consider an alternative perspective on climate change: The sum of solar radiation and heat generated by human activity result in a net energy input of 1.96 times that of the Sun on the Earth's surface. The expanding global population is expected to exacerbate this issue. Potential solutions are proposed, including replacement and heat recycling.
Martin Bertau, Gerald Steiner
wiley   +1 more source

The bends in the slopes of radial abundance gradients in the disks of spiral galaxies – Do they exist? [PDF]

, 2002
Spiral galaxies with a reported bend in the slope of gradient in the oxygen abundances (O/H)_R23, derived with traditionally used R23 - method, were examined. It is shown that the artificial origin of the reported bends can be naturally explained.
L. S. Pilyugin
openalex   +4 more sources

Simulations of the galaxy population constrained by observations from z=3 to the present day: implications for galactic winds and the fate of their ejecta [PDF]

, 2012
We apply Monte Carlo Markov Chain (MCMC) methods to large-scale simulations of galaxy formation in a LambdaCDM cosmology in order to explore how star formation and feedback are constrained by the observed luminosity and stellar mass functions of galaxies.
Angulo, Baldry, Baldry, Behroozi, Bell, Benson, Benson, Bertone, Bigiel, Bower, Bower, Bower, Boylan-Kolchin, Bruno M. B. Henriques, Bruzual, Caputi, Chabrier, Cirasuolo, Cole, Cole, Cole, Conroy, Conroy, Croton, De Lucia, De Lucia, De Lucia, De Lucia, Domínguez Sánchez, Drory, Fontana, Fontanot, Fontanot, Frenk, Fu, Gallazzi, Gerard Lemson, Giallongo, Guo, Guo, Guo, Guo, Guo, Haas, Hastings, Hatton, Helly, Henriques, Henriques, Henriques, Henriques, Henriques, Ilbert, Ilbert, Jones, Kampakoglou, Kang, Kauffmann, Kauffmann, Kauffmann, Kauffmann, Kauffmann, Kennicutt, Kitzbichler, Lacey, Li, Lu, Lu, Lu, Maraston, Marchesini, Marchesini, Marchesini, Metropolis, Moster, Moster, Mutch, Neistein, Norberg, Oppenheimer, Oppenheimer, Peter A. Thomas, Poli, Pozzetti, Pozzetti, Press, Pérez-González, Qi Guo, Raul E. Angulo, Reddick, Roukema, Salim, Salimbeni, Saracco, Simon D. M. White, Somerville, Somerville, Somerville, Springel, Springel, Tonini, Vale, Volker Springel, Wang, Weinmann, Weinmann, Weinmann, White, White, Willmer, Zucca   +110 more
core   +2 more sources

The oxygen abundance deficiency in irregular galaxies [PDF]

, 2000
The observed oxygen abundances in a number of irregular galaxies have been compared with predictions of the closed-box model of chemical and photometric evolution of galaxies. Oxygen is found to be deficient with respect to the predicted abundances. This
Ferrini, F., Pilyugin, L. S.
core   +2 more sources

Complete element abundances of nine stars in the r-process galaxy Reticulum II [PDF]

, 2016
We present chemical abundances derived from high-resolution Magellan/MIKE spectra of the nine brightest known red giant members of the ultra-faint dwarf galaxy Reticulum II.
Chiti, Anirudh, Frebel, Anna, Ji, Alexander P., Simon, Joshua D.   +3 more
core   +2 more sources

He abundances in disc galaxies. I. Predictions from cosmological chemodynamical simulations [PDF]

, 2019
Accepted for publication in A&AWe investigate how the stellar and gas-phase He abundances evolve as a function of time within simulated star-forming disc galaxies with different star formation histories.
Kobayashi, Chiaki, Mackereth, J. Ted, Miglio, Andrea, Montalban, Josefina, Vincenzo, Fiorenzo   +4 more
core   +5 more sources

Oxygen and nitrogen abundances in Virgo and field spirals [PDF]

, 2001
The oxygen and nitrogen abundances in the HII regions of the nine Virgo spirals of the sample from Skillman et al (1996) and in nine field spiral galaxies are re-determined with the recently suggested P - method.
Alloin, Biviano, Boulanger, Branch, Bresolin, Caldwell, Cayatte, Cayatte, Distefano, Dopita, Dressler, Drozdovsky, Dufour, Díaz, Edmunds, F. Ferrini, Ferguson, Ferrini, Ferrini, Ferrini, Ferrini, Gallagher, Garnett, Gavazzi, Gavazzi, Guhathakurta, Haynes, Henry, Henry, Henry, Huchtmeier, Huchtmeier, J. M. Vílchez, Karachentsev, Kenney, Kenney, Kennicutt, Kennicutt, Kinkel, Knapen, Knappen, Koopmann, L. S. Pilyugin, M. Mollá, McCall, Mollá, Mollá, Mollá, Mollá, Nomoto, Oey, Pagel, Pagel, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Poggianti, Prieto, Renzini, Rownd, Schmidt, Searle, Shields, Shostak, Skillman, Smith, Solanes, Solanes, van Zee, van Zee, Verter, Vila-Costas, Warmels, Webster, Wevers, Wilson, Woosley, Zaritsky   +79 more
core   +2 more sources

Multi-Element Abundance Measurements from Medium-Resolution Spectra. II. Catalog of Stars in Milky Way Dwarf Satellite Galaxies [PDF]

, 2010
We present a catalog of Fe, Mg, Si, Ca, and Ti abundances for 2961 red giant stars that are likely members of eight dwarf satellite galaxies of the Milky Way (MW): Sculptor, Fornax, Leo I, Sextans, Leo II, Canes Venatici I, Ursa Minor, and Draco. For the
Adelman-McCarthy, An, Bell, Bell, Bellazzini, Bellazzini, Binney, Carretta, Castelli, Castelli, Chonis, Christopher Sneden, Clem, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Constance M. Rockosi, Da Costa, Demarque, Evan N. Kirby, Ferraro, Font, Frebel, Fulbright, Fulbright, Geisler, Gratton, Gray, Guhathakurta, Gustafsson, Gustafsson, Irwin, Ivans, Johnson, Joshua D. Simon, Judith G. Cohen, Kirby, Kirby, Kirby, Kirby, Kirby, Koch, Kuehn, Kurucz, Kurucz, Lai, Lai, Lee, Majewski, Majewski, Markwardt, Marla C. Geha, Martin, Michael Siegel, Mighell, Norris, Pietrzyński, Pritzl, Puragra Guhathakurta, Ramírez, Ramírez, Robertson, Roederer, Sadakane, Sangmo Tony Sohn, Sbordone, Sbordone, Schlegel, Shetrone, Shetrone, Shetrone, Shetrone, Siegel, Siegel, Simon, Simon, Sneden, Sneden, Sneden, Sohn, Spite, Steven R. Majewski, Thévenin, Venn, Webbink, Westfall, White, Zacharias, Zucker   +93 more
core   +3 more sources

Segue 1: An Unevolved Fossil Galaxy from the Early Universe [PDF]

, 2013
We present Magellan/MIKE and Keck/HIRES high-resolution spectra of six red giant stars in the dwarf galaxy Segue 1. Including one additional Segue 1 star observed by Norris et al. (2010), high-resolution spectra have now been obtained for every red giant
Frebel, Anna, Kirby, Evan N., Simon, Joshua D.   +2 more
core   +3 more sources