Results 131 to 140 of about 52,634 (236)

Interstellar Nitrogen Isotope Ratios: Measurements on Tracers of C14N and C15N

The Astrophysical Journal
The nitrogen isotope ratio ^14 N/ ^15 N is a powerful tool to trace Galactic stellar nucleosynthesis and constrain Galactic chemical evolution. Previous observations have found lower ^14 N/ ^15 N ratios in the Galactic center and higher values in the ...
J. L. Chen, J. S. Zhang, C. Henkel, Y. T. Yan, H. Z. Yu, Y. X. Wang, Y. P. Zou, J. Y. Zhao, X. Y. Wang   +8 more
doaj   +1 more source

I(CO)/N(H2) conversions and molecular gas abundances in spiral and irregular galaxies

, 1988
Philip R. Maloney, J. H. Black
openalex   +1 more source

Constraining the Low-mass End of the Stellar-to-halo Mass Relation with Surveys of Satellite Galaxies

The Astrophysical Journal
The abundance of satellite galaxies is set by the hierarchical assembly of their host halo. We leverage this to investigate the low-mass end ( M _H < 10 ^11 M _⊙ ) of the stellar-to-halo mass relation (SHMR), which is key to constraining theories of ...
J. Sebastian Monzon, Frank C. van den Bosch, Kaustav Mitra   +2 more
doaj   +1 more source

The Primordial Helium Abundance as Determined from Chemical Evolution of Irregular Galaxies

, 1993
M. J. Balbes, R. N. Boyd, Grant J. Mathews   +2 more
openalex   +1 more source

Chemical evolution of irregular galaxies and the primordial He-4 abundance

, 1993
Grant J. Mathews, R. N. Boyd, George M. Fuller   +2 more
openalex   +1 more source

Metal Abundances in the Hot ISM of Elliptical Galaxies [PDF]

, 1998
Michael Loewenstein, R. F. Mushotzky
openalex   +1 more source

Figuring Out Gas and Galaxies In Enzo (FOGGIE). VIII. Complex and Stochastic Metallicity Gradients at z > 2

The Astrophysical Journal
Gas-phase metallicity gradients are a crucial element in understanding the chemical evolution of galaxies. We use the FOGGIE simulations to study the metallicity gradients (∇ Z ) of six Milky Way–like galaxies throughout their evolution.
Ayan Acharyya, Molly S. Peeples, Jason Tumlinson, Brian W. O’Shea, Cassandra Lochhaas, Anna C. Wright, Raymond C. Simons, Ramona Augustin, Britton D. Smith, Eugene Hyeonmin Lee   +9 more
doaj   +1 more source

The form of abundance gradients in three nearby spiral galaxies: M33, M81 and M101

, 1995
R. B. C. Henry, Joseph W. Howard
openalex   +1 more source

Vertical abundances variation in the galaxy: The case of PN [PDF]

, 1997
F. Cuisinier, J. Köppen
openalex   +1 more source

Two-process Model and Residual Abundance Analysis of the Milky Way Massive Satellites

The Astrophysical Journal
The “two-process model” is a promising technique for interpreting stellar chemical abundance data from large-scale surveys (e.g., the Sloan Digital Sky Survey IV/V and the Galactic Archeology with HERMES survey), enabling more quantitative empirical ...
Sten Hasselquist, Christian R. Hayes, Emily J. Griffith, David Weinberg, Tawny Sit, Rachael L. Beaton, Danny Horta   +6 more
doaj   +1 more source