Results 61 to 70 of about 1,069,925 (330)

Abundances in 78 metal-rich bulge spheroid stars from APOGEE

Astronomy & Astrophysics
Context. The inner Galaxy is the most complex region of the Milky Way, comprising the early bulge, inner thin and thick discs, and inner halo stars; moreover, the formation of the bar caused transfer of gas and stars from the disc to the inner Galaxy ...
Ernandes H., Barbuy B., Chiappini C., Feltzing S., Pérez-Villegas A., Friaça A. C. S., Souza S. O., Nunes R. P., Queiroz A. B. A., Fernández-Trincado J. G., Rocha de Abreu A. L., Plotnikova A.   +11 more
doaj   +1 more source

Emission-line Diagnostics of Low Metallicity AGN [PDF]

, 2006
Current emission-line based estimates of the metallicity of active galactic nuclei (AGN) at both high and low redshifts indicate that AGN have predominantly solar to supersolar metallicities. This leads to the question: do low metallicity AGN exist?
Groves, Brent, Heckman, Timothy, Kauffmann, Guinevere   +2 more
core   +3 more sources

Chemical abundances of LINER galaxies – nitrogen abundance estimations

Monthly Notices of the Royal Astronomical Society
ABSTRACT In this work, we investigated the nitrogen and oxygen abundances in a sample of galaxies with Low Ionization Nuclear Emission Regions (LINERs) in their nucleus. Optical spectroscopic data (3600 – 10 000 Å) of 40 LINERs from the Mapping Nearby Galaxies (MaNGAs) survey were considered.
C B Oliveira, Â. C. Krabbe, O. L. Dors, I. A. Zinchenko, J. A. Hernández-Jiménez, M. V. Cardaci, G. F. Hägele, Gabriele S Ilha   +7 more
openaire   +3 more sources

Abundance ratios in hierarchical galaxy formation [PDF]

Astrophysics and Space Science, 1999
7 pages, 3 figures, accepted by ...
openaire   +5 more sources

Thin disc, Thick Disc and Halo in a Simulated Galaxy [PDF]

, 2012
Within a cosmological hydrodynamical simulation, we form a disc galaxy with sub- components which can be assigned to a thin stellar disc, thick disk, and a low mass stellar halo via a chemical decomposition.
A. V. Macciò, Abadi, Abadi, Agertz, Assmann, B. K. Gibson, Bekki, Bensby, Bensby, Bensby, Bensby, Bournaud, Bovy, Bovy, Brook, Brook, Brook, Brook, Brooks, C. B. Brook, Ceverino, Chiappini, Chiba, D. Kawata, Dalcanton, De Silva, Doménech-Moral, E. L. House, Fenner, Freeman, Freyer, Fuhrmann, Fuhrmann, G. S. Stinson, Gilmore, Governato, Guedes, Hammer, Hayashi, House, Ivezić, J. Wadsley, Jurić, K. Pilkington, Katz, Kazantzidis, Kereš, Kobayashi, Kroupa, Loebman, M. S. Miranda, Majewski, Martig, Navarro, Noguchi, Nomoto, Nordström, Okamoto, Pilkington, Piontek, Qu, Quillen, Quinn, R. Roškar, Reddy, Robertson, Ruchti, Sales, Samland, Sawala, Scannapieco, Scannapieco, Schönrich, Shen, Smiljanic, Soubiran, Stinson, Stinson, T. R. Quinn, Tissera, Torres, Villalobos, Wadsley, Woosley, Wyse, Yoachim, Yoachim, Zolotov   +87 more
core   +5 more sources

Molecular tracers of PDR-dominated galaxies [PDF]

, 2009
Photon-dominated regions (PDRs) are powerful molecular line emitters in external galaxies. They are expected in galaxies with high rates of massive star formation due to either starburst (SB) events or starburst coupled with active galactic nuclei (AGN ...
Bayet, Bayet, Chieffi, D. A. Williams, E. Bayet, Evans, Gao, García-Burillo, Gerin, Graciá-Carpio, Habing, Heger, Imanishi, Israel, J. M. C. Rawlings, Knauth, Knudsen, Kohno, Kohno, Krips, Krips, Lintott, Martín, Martín, Meyer, Origlia, Papadopoulos, Riechers, S. Viti, Sakamoto, Snow, Sofia, Solomon, Sosa-Brito, T. Bell, Umeda, Wagg, Wu   +37 more
core   +2 more sources

Distribution of iron, oxygen, and sulfur in the direction of the outer arms of the Galaxy★

Astronomy & Astrophysics
Aims. We conducted a high-resolution spectroscopic study of 51 distant Cepheids located in the outer part of the Galactic disk in the direction of the Perseus Arm.
Andrievsky S. M., Martin R. P., Korotin S. A.   +2 more
doaj   +1 more source

Planetary nebulae in the inner Milky Way: new abundances [PDF]

, 2009
The study of planetary nebulae in the inner-disk and bulge gives important information on the chemical abundances of elements such as He, N, O, Ar, Ne, and on the evolution of these abundances, which is associated with the evolution of intermediate-mass ...
Cavichia, O., Costa, R. D. D., Maciel, W. J.   +2 more
core   +2 more sources

The Oxygen Abundance of Nearby Galaxies from Sloan Digital Sky Survey Spectra

, 2007
We have derived the oxygen abundance for a sample of nearby galaxies in the Data Release 5 of the Sloan Digital Sky Survey (SDSS) which possess at least two independent spectra of one or several HII regions with a detected [OIII]4363 auroral line. Since,
Campbell A., Edmunds M. G., Kinkel U., Leonid S. Pilyugin, Luridiana V., Pagel B. E. J., Pagel B. E. J., Pagel B. E. J., Pilyugin L. S., Pilyugin L. S., Trinh X. Thuan   +10 more
core   +1 more source

CHEMICAL ABUNDANCES OF THE LEO II DWARF GALAXY [PDF]

, 2008
We use previously published moderate-resolution spectra in combination with stellar atmosphere models to derive the first measured chemical abundance ratios in the Leo II dwarf Spheroidal (dSph) galaxy. We find that for spectra with signal-to-noise ratio
M. Shetrone, M. Siegel, D. Cook, T. Bosler   +3 more
semanticscholar   +1 more source