Results 21 to 30 of about 52,634 (236)

Intermediate Element Abundances in Galaxy Clusters

, 2003
We present the average abundances of the intermediate elements obtained by performing a stacked analysis of all the galaxy clusters in the archive of the X-ray telescope ASCA.
Arnaud M., Cappellaro E., D. J. Horner, Fukazawa Y., Gibson B. K., Grevesse N., Grevesse N., Guainazzi M., Ishimaru Y., M. Loewenstein, Matsumoto H., Mitchell R. J., Peimbert M., R. F. Mushotzky, Tanaka Y., W. H. Baumgartner   +15 more
core   +1 more source

Validity of abundances derived from spaxel spectra of the MaNGA survey [PDF]

, 2017
We measured the emission lines in the spaxel spectra of MaNGA galaxies in order to determine the abundance distributions therein. It has been suggested that the strength of the low-ionization lines, R_2, N_2, and S_2 may be increased (relative to Balmer ...
Berczik, P. P., Grebel, E. K., Nefedyev, Y. A., Pilyugin, L. S., Shulga, V. M., Wei, Han, Zinchenko, I. A.   +6 more
core   +2 more sources

Chemical behavior of the Dwarf Irregular Galaxy NGC 6822. Its PN and HII region abundances

, 2009
We aim to derive the chemical behavior of a significant sample of PNe and HII regions in the irregular galaxy NGC 6822 The selected objects are distributed in different zones of the galaxy.
Allen, Bauman, Brandenburg, Carigi, Carigi, Carigi, Costa, de Blok, de Blok, Demers, Dufour, Fisher, Franco, Gieren, Grevesse, Henry, Henry, Hernández-Martínez, Herwig, Hidalgo-Gámez, Hirschi, Hirschi, Hodge, J. García-Rojas, Karakas, Killen, Kingdon, Kingsburgh, Kniazev, Kroupa, L. Carigi, L. Hernández-Martínez, Lee, Leisy, Leisy, Leisy, M. Peña, Magrini, Magrini, Marigo, Massey, Mateo, Meynet, Nomoto, Peimbert, Peimbert, Peña, Porter, Richer, Richer, Seaton, Shaw, Stasinska, Storey, Venn, Wang, Woosley   +56 more
core   +1 more source

Nitrogen Production in Starburst Galaxies Detected by GALEX [PDF]

, 2007
We investigate the production of nitrogen in star-forming galaxies with ultraviolet (UV) radiation detected by the Galaxy Evolution Explorer Satellite (GALEX).
Barlow, Tom A., Bianchi, Luciana, Charlot, Stéphane, Donas, José, Forster, Karl, Friedman, Peter G., Heckman, Timothy M., Kewley, Lisa J., Lee, Young-Wook, Madore, Barry F., Mallery, Ryan P., Martin, D. Christopher, Milliard, Bruno, Morrissey, Patrick, Neff, Susan G., Rich, R. Michael, Salim, Samir, Schiminovich, David, Seibert, Mark, Small, Todd, Szalay, Alex S., Tremonti, Christy, Welsh, Barry Y., Wyder, Ted, Yi, Sukyoung   +24 more
core   +4 more sources

Rapid Chemical Enrichment by Intermittent Star Formation in GN-z11

The Astrophysical Journal Letters
We interpret the peculiar supersolar nitrogen abundance recently reported by the James Webb Space Telescope observations for GN-z11 ( z = 10.6) using our state-of-the-art chemical evolution models.
Chiaki Kobayashi, Andrea Ferrara
doaj   +1 more source

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, EarlyView.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +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

Oxygen abundance distributions in six late-type galaxies based on SALT spectra of HII regions

, 2015
Spectra of 34 H II regions in the late-type galaxies NGC1087, NGC2967, NGC3023, NGC4030, NGC4123, and NGC4517A were observed with the South African Large Telescope (SALT). In all 34 H II regions, oxygen abundances were determined through the "counterpart"
Grebel, E. K., Kniazev, A. Y., Pilyugin, L. S., Zinchenko, I. A.   +3 more
core   +1 more source

Subsystems of the Galactic halo, their structures and compositions

Odessa Astronomical Publications, 2017
It is shown that general populations of globular clusters and metal-poor field stars are components at least of three subsystems occupying different volumes in the Galaxy.
V. A. Marsakov, T. V. Borkova
doaj   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, EarlyView.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source