Results 41 to 50 of about 37,027 (256)

SAGAbg. I. A Near-unity Mass-loading Factor in Low-mass Galaxies via Their Low-redshift Evolution in Stellar Mass, Oxygen Abundance, and Star Formation Rate

The Astrophysical Journal
Measuring the relation between star formation and galactic winds is observationally difficult. In this work we make an indirect measurement of the mass-loading factor (the ratio between the mass outflow rate and star formation rate) in low-mass galaxies ...
Erin Kado-Fong, Marla Geha, Yao-Yuan Mao, Mithi A. C. de los Reyes, Risa H. Wechsler, Yasmeen Asali, Nitya Kallivayalil, Ethan O. Nadler, Erik J. Tollerud, Benjamin Weiner   +9 more
doaj   +1 more source

Giant Halos in Dwarf Irregular Galaxies vs. Dwarf Elliptical Galaxies

, 2005
We present a discovery of a giant stellar halo in NGC 6822, a dwarf irregular galaxy in the Local Group. This halo is mostly made of old red giants, showing striking features: 1) it is several times larger than the main body of the galaxy seen in the ...
Hwang, Narae, Lee, Myung Gyoon
core   +1 more source

The Stellar Populations of NGC 3109: Another Dwarf Irregular Galaxy with a Population II Stellar Halo [PDF]

, 1998
We have obtained V and I-band photometry for about 17500 stars in the field of the dwarf irregular galaxy NGC3109, located in the outskirts of the Local Group.
Albert A. Zijlstra,, Bertelli G., Chiosi C., Dante Minniti, Hodge P., M. Victoria Alonso, Zijlstra A. A.   +6 more
core   +2 more sources

Magnetic Fields in Irregular Galaxies [PDF]

Highlights of Astronomy, 2002
AbstractRadio data of large irregular galaxies reveal some extended synchrotron emission with a substantial degree of polarization. In the case of NGC 4449 strong galaxy-scale regular magnetic fields were found, in spite of the lack of ordered rotation required for the conventional dynamo action.
openaire   +1 more source

PERICLES: A Set of Empirical Rotational Isochrones Modeled on Cool Dwarfs in Open Clusters and Wide Binaries

Astronomische Nachrichten, EarlyView.
ABSTRACT Isochrones, equal‐age curves, are widely used in astrophysics to estimate stellar ages. Classical stellar parameters are, however, very limited in their usability for main sequence stars because of their weak age‐dependence. Here, rotation period measurements provide complementary information.
David Gruner, Sydney A. Barnes
wiley   +1 more source

Global properties of irregular galaxies

The Astrophysical Journal Supplement Series, 1982
We present optical and radio observations of global properties for a sample of noninteracting irregular galaxies and a few comparison objects. Program galaxies were chosen primarily on the basis of their blue colors and thus may be expected to represent systems with high rates of star formation.
D. A. Hunter, J. S. Gallagher, D. Rautenkranz   +2 more
openaire   +1 more source

Understanding Degradation Mechanisms in Water‐In‐Salt Electrolyte. Part 2: Impact of the Electrochemical Parameters on the Cycling Behavior of LiFePO4 versus TiS2

Batteries &Supercaps, EarlyView.
Cycling water‐in‐salt batteries involves complex degradation processes that require multiprobe analysis. Using online electrochemical mass spectrometry (OEMS), postmortem X‐ray photoemission spectroscopy (XPS) (including hard‐XPS), and scanning electron microscopy (SEM), the degradation mechanisms are examined in composite electrodes (TiS2 and LiFePO4)
Célia Doublet, Théo Faverge, Vincent Martin, Hiram Castillo Michel, Jean‐Pascal Rueff, Marian Chatenet, Lauréline Lecarme, Claire Villevieille   +7 more
wiley   +1 more source

Adaptive optics imaging and optical spectroscopy of a multiple merger in a luminous infrared galaxy

, 2007
(abridged) We present near-infrared (NIR) adaptive optics imaging obtained with VLT/NACO and optical spectroscopy from the Southern African Large Telescope (SALT) of a luminous infrared galaxy (LIRG) IRAS 19115-2124. These data are combined with archival
A. Adamo, A. Efstathiou, A. Kniazev, A. Zijlstra, Alberdi, Anders, Arribas, Barnes, Barnes, Bell, Bergvall, Bertin, Bohlin, Borne, Bournaud, Brosch, Buckley, Burgh, Bushouse, Chakrabarti, Chapman, Choi, Cole, Colina, Colina, Conselice, Coppin, Cui, Cullen, D. A. H. Buckley, D. Farrah, Dasyra, Dasyra, Davoodi, Denicoló, Di Matteo, E. B. Burgh, E. Romero-Colmenero, Efstathiou, Efstathiou, Elbaz, Farrah, Farrah, Farrah, Farrah, G. Östlin, Genzel, Giveon, Heckman, Hinz, Houck, Hughes, James, Jarrett, K. Nordsieck, Kawakatu, Kennicutt, Kim, Kobulnicky, L. Crause, Levenson, Lonsdale, Lonsdale, Lípari, Lípari, M. Still, Martin, Mattila, Mattila, Mihos, Mirabel, Monreal-Ibero, Monreal-Ibero, Murphy, Murphy, N. Loaring, Naab, Naab, Naab, O'Donaghue, P. H. Johansson, P. Lira, P. Väisänen, Pahre, Parra, Peng, Phillips, Pérez-Torres, Rhoads, Rieke, Rieke, Robertson, Rupke, S. Mattila, S. Ryder, Sanders, Sanders, Schwartz, Sirianni, Smail, Smith, Sparks, Spoon, Springel, Springel, Strauss, Sturm, Takata, Thronson, Valiante, Veilleux, Veilleux, Veilleux, Veilleux, Veilleux, Verma, Väisänen, Wahde, Wang, Wetzstein, Y. Hashimoto, Zasov   +121 more
core   +2 more sources

Nitrogen in irregular galaxies

The Astrophysical Journal, 1990
A study of nitrogen in giant H II regions located within low-abundance irregular galaxies is presented. Both observations and theoretical models are used to examine variations in the abundance of nitrogen relative to oxygen in these galaxies. Analysis of these and previously published observations suggests that the use of low spectral resolution is the
openaire   +1 more source

European Journal of Heart Failure consensus statement. Heart failure pharmacotherapy for patients with heart failure with reduced ejection fraction and concomitant atrial fibrillation: Review of evidence and call to action

European Journal of Heart Failure, EarlyView.
Heart failure (HF) and atrial fibrillation (AF) are major global health challenges with rising prevalence and significant morbidity, mortality, and healthcare burden. Despite advances in HF management, AF remains a critical comorbidity that worsens outcomes and requires ad hoc treatment strategies, increasing the risk of non‐adherence and side effects.
Mark Luedde, Stefan Agewall, Giuseppe Ambrosio, Antoni Bayes‐Genis, Claudio Borghi, Elisabetta Cerbai, Gheorghe A. Dan, Heinz Drexel, Péter Ferdinandy, Erik Lerkevang Grove, Juan Carlos Kaski, Roland Klingenberg, Joao Morais, William Parker, Mark C. Petrie, Bianca Rocca, Anne Grete Semb, Michele Senni, Christian Sohns, Patrick Sulzgruber, Juan Tamargo, Marco Metra, Michael Böhm, Dobromir Dobrev, Samuel Sossalla   +24 more
wiley   +1 more source