Results 1 to 10 of about 52,268 (222)

The Metallicity and Distance of Leo A from Blue Supergiants

The Astrophysical Journal, 2023
We have obtained high-quality spectra of blue supergiant candidates in the dwarf irregular galaxy Leo A with the Low Resolution Imaging Spectrometer at the Keck I telescope.
Miguel A. Urbaneja, Fabio Bresolin, Rolf-Peter Kudritzki   +2 more
doaj   +1 more source

Robust Data-driven Metallicities for 175 Million Stars from Gaia XP Spectra

The Astrophysical Journal Supplement Series, 2023
We derive and publish data-driven estimates of stellar metallicity [M/H] for ∼175 million stars with low-resolution XP spectra published in Gaia DR3.
René Andrae, Hans-Walter Rix, Vedant Chandra   +2 more
doaj   +1 more source

Understanding the Chemical Evolution of Blue Edge-on Low Surface Brightness Galaxies

The Astrophysical Journal, 2023
We present a sample of 330 blue edge-on low surface brightness galaxies (ELSBGs). To understand the chemical evolution of ELSBGs, we derived the gas-phase abundance and the [ α /Fe] ratio.
Tian-wen Cao, Hong Wu, Gaspar Galaz, Venu M. Kalari, Cheng Cheng, Zi-Jian Li, Jun-feng Wang   +6 more
doaj   +1 more source

Chemical Analysis of the Brightest Star of the Cetus II Ultrafaint Dwarf Galaxy Candidate

The Astrophysical Journal, 2023
We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra.
K. B. Webber, T. T. Hansen, J. L. Marshall, J. D. Simon, A. B. Pace, B. Mutlu-Pakdil, A. Drlica-Wagner, C. E. Martínez-Vázquez, M. Aguena, S. S. Allam, O. Alves, E. Bertin, D. Brooks, A. Carnero Rosell, J. Carretero, L. N. da Costa, J. De Vicente, P. Doel, I. Ferrero, D. Friedel, J. Frieman, J. García-Bellido, G. Giannini, D. Gruen, R. A. Gruendl, S. R. Hinton, D. L. Hollowood, K. Honscheid, K. Kuehn, J. Mena-Fernández, F. Menanteau, R. Miquel, R. L. C. Ogando, M. E. S. Pereira, A. Pieres, A. A. Plazas Malagón, E. Sanchez, B. Santiago, J. Allyn Smith, M. Smith, E. Suchyta, G. Tarle, C. To, N. Weaverdyck, B. Yanny   +44 more
doaj   +1 more source

Elemental Abundances in the X-Ray Gas of Early-Type Galaxies with XMM and Chandra Observations [PDF]

, 2009
The source of hot gas in elliptical galaxies is thought to be due to stellar mass loss, with contributions from supernova events and possibly from infall from a surrounding environment.
Alex Athey, Arimoto, Athey, Brown, Buote, Buote, de Vaucouleurs, Edward J. Lloyd-Davies, Fabbiano, Humphrey, Irwin, Irwin, Jimmy A. Irwin, Joel N. Bregman, Jones, Jun Ji, Kim, Kim, Machacek, Minniti, O'Sullivan, Park, Randall, Randall, Smith, Tawara, Tonry, Trager, Xu   +28 more
core   +1 more source

Galactic Abundances: Report of Working Group 3 [PDF]

, 2001
We summarize the various methods and their limitations and strengths to derive galactic abundances from in-situ and remote-sensing measurements, both from ground-based observations and from instruments in space. Because galactic abundances evolve in time
Bothmer, V., Buclin, F., Christian, E. R., Cummings, A. C., Flückiger, E. O., George, J. S., Hofer, M. Y., Jones, F. C., Keller, J. W., Kirilova, D., Klecker, B., Kunow, H., Laming, M., Salerno, E., Sofia, U. J., Stone, E. C., Thielemann, F.-K., Tranquille, C., Wenzel, K.-P., Wiedenbeck, M. E.   +19 more
core   +1 more source

Connecting the primordial and Galactic deuterium abundances [PDF]

, 2007
The deuterium abundances inferred from observations of the interstellar medium within 1-2 kpc of the Sun range over a factor of three and the corresponding oxygen abundances show an even larger dispersion.
Romano, Donatella, Steigman, Gary, Tosi, Monica   +2 more
core   +3 more sources

Galaxy Populations in Groups and Clusters: Evidence for a Characteristic Stellar Mass Scale at M ∗ ∼ 109.5 M ⊙

The Astrophysical Journal, 2023
We use the DR9 of the DESI legacy imaging survey and SDSS galaxy groups to measure the conditional luminosity function (CLF) for groups with halo mass M _h ≥ 10 ^12 M _⊙ and redshift 0.01 ≤ z ≤ 0.08, down to a limiting r -band magnitude of M _r = −10 to −
Jiacheng Meng, Cheng Li, H. J. Mo, Yangyao Chen, Zhen Jiang, Lizhi Xie   +5 more
doaj   +1 more source

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

Oxygen abundances in dwarf irregular galaxies and the metallicity - luminosity relationship [PDF]

, 2001
The low-luminosity dwarf irregular galaxies are considered. The oxygen abundances in HII regions of dwarf irregular galaxies were recalculated from published spectra through the recently suggested P - method. It has been found that the metallicity of low-
Pilyugin, L. S.
core   +2 more sources