Results 11 to 20 of about 7,914 (245)

Dark Energy Survey Year 1 results : cosmological constraints from cluster abundances, weak lensing, and galaxy correlations [PDF]

, 2021
We present the first joint analysis of cluster abundances and auto or cross-correlations of three cosmic tracer fields: galaxy density, weak gravitational lensing shear, and cluster density split by optical richness.
To, Chun-Hao, DES Collaboration, Santiago, Basilio Xavier   +2 more
core   +1 more source

Abundance Ratios in Dwarf Elliptical Galaxies [PDF]

Proceedings of the International Astronomical Union, 2016
AbstractThe aim of this study is to determine abundance ratios and star formation histories (SFH) of dwarf ellipticals in the nearby Virgo cluster. We perform a stellar population analysis of 39 dEs and study them using index-index and scaling relations. We find an unusual behaviour where [Na/Fe] is under-abundant w.r.t.
Sen, Seyda, Peletier, Reynier F., Toloba, Elisa, Mentz, Jaco J.   +3 more
openaire   +4 more sources

On the use of sulphur as a tracer for abundances in galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2022
Abstract 2+We present a methodology for the use of sulphur as global metallicity tracer in galaxies, allowing performing a complete abundance analysis using only the red-to-near-infrared spectral region. We have applied it to a compilation of high-quality data split into two samples: H ii regions (DHR) in spiral and irregular galaxies ...
Ángeles I Díaz, S Zamora
openaire   +3 more sources

Dark Energy Survey Year 1 Results: Cosmological Constraints from Cluster Abundances, Weak Lensing, and Galaxy Correlations [PDF]

, 2020
International audienceWe present the first joint analysis of cluster abundances and auto or cross-correlations of three cosmic tracer fields: galaxy density, weak gravitational lensing shear, and cluster density split by optical richness.
Diehl, H. T., Sánchez, C., Rykoff, E.S., Prat, J., Bertin, E., Sheldon, E., Burke, D.L., Avila, S., Burke, D., Rozo, E., Serrano, S., Zuntz, Joseph, J., Elvin-Poole, Hinton, S. R., Evrard, A.E., Morgan, R., Huterer, D., Wechsler, R.H., Hartley, W. G., Pereira, M.E.S., H Wu (7724324), Troxel, M.A., Romer, A. K., Kron, R., Bernstein, G.M., Troxel, M. A., Swanson, M., Hartley, W.G., Brooks, D., Gatti, M., Crocce, M., Ferrero, I., Pereira, Maria Elidaiana da Silva, Bridle, S., Tucker, D.L., Abbott, T., To, C., Marshall, J. L., Swanson, M. E. C., Ferrero, I, Annis, J., Park, Y., James, D. J., Plazas, A.A., Gaztanaga, E., Evrard, A. E., Tucker, D. L., Sevilla-Noarbe, I, Gruendl, Robert A., Thomas, D., Abbott, T. M. C., Maia, M.A.G., Myles, J., García-Bellido, Juan, Plazas, A., Evrard, A., Friedrich, O., Desai, Shantanu et. al., Myles, Justin, E Rozo (16233077), Pereira, M. E. S., Menanteau, F., T F Eifler (16231247), Plazas, A. A., da Costa, L., Jarvis, M., Maccrann, N., Evrard, August E., Choi, A., Davis, T. M., Ross, A.J., Fosalba, P., Gruen, D., Gaztañaga, Enrique, Becker, M.R., Drlica-Wagner, A., Kuropatkin, N., Rosell, A., Miquel, R., Burke, D. L., Varga, T.N., Rykoff, E. S., J Blazek (12492481), Huterer, Dragan, Weller, Jochen, Tarle, G., Abbott, T.M.C., Bridle, S.L., Elvin-Poole, J., Wester, W., da Costa, L.N., others (6644544), Wilkinson, R., Ross, A. J., da Costa, L. N., Ross, Ashley J., Everett, S., Scarpine, V, Carnero Rosell, A., Marshall, J., Vielzeuf, P., Dietrich, J. P., E S Rykoff (16231346), Dietrich, J.P., MacCrann, Niall, James, D., Wechsler, R., Dietrich, J., D Gruen (7793453), Hoyle, B., Becker, M. R., Diehl, H.T., Swanson, M.E.C., Paz-Chinchón, Francisco, Zuntz, J., Hollowood, Devon L., Porredon, A., Aguena, M., Weller, J., Hollowood, D. L., Santiago, B., Blazek, J., Costanzi, M., Zhang, Y., Hartley, W., Hinton, Samuel R., G M Bernstein (16038710), Farahi, A., Davis, T.M., Romer, A., Rykoff, E., Kind, M., Rau, M. M., Gruendl, R., García-Bellido, J., Miranda, V., Becker, M., Porredon, Anna, Samuroff, S., Palmese, A., Bernstein, G., Kathy Romer (4460893), Bocquet, S., Hinton, S., Rau, M., Varga, T. N., Marshall, J.L., Giannantonio, T., Frieman, J., Eifler, T.F., Bridle, S. L., Sunayana Bhargava (4466935), Wilkinson, R. D., M Costanzi (13470256), Gutierrez, G., Maia, M., Gruen, Daniel, Carretero, J., Giannantonio, Tommaso, Wechsler, Risa H., Fang, X., Rykoff, Eli S., Chang, C., Diehl, H., Krause, E., Troxel, M., Smith, M., Pereira, M., DES Collaboration, Serrano, Santiago, Varga, T., M R Becker (16233032), Eifler, T., Muir, J., Bridle, Sarah L., Derose, J., Sevilla-Noarbe, I., Flaugher, B., Gruendl, R.A., Tucker, D., Paz-Chinchón, F., Davis, T., Conselice, C., Cawthon, R., Suchyta, E., R H Wechsler (16219145), Carrasco Kind, Matias, Hollowood, D.L., Wechsler, R. H., Davis, C., S Bocquet (16038758), Desai, S., Wu, H., Mcclintock, T., C To (14029857), E Krause (7746401), Romer, A.K., Hinton, S.R., Sanchez, E., To, Chun-Hao, Jeltema, T., Scarpine, V., Ferrero, Ismael, Fosalba, Pablo, DES Collaboration (16038677), Carrasco Kind, M., Roodman, A., Miranda, V, Rau, M.M., Eifler, T. F., Bhargava, S., Gruendl, R. A., Lima, M., Bernstein, G. M., Ross, A., Wilkinson, Reese D., Plazas, Andrés A., Honscheid, K., James, D.J., Amon, A., Maia, M. A. G., Hollowood, D., Kuehn, K., Crocce, Martín   +223 more
core   +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

Modeling abundances in galaxies [PDF]

Proceedings of the International Astronomical Union, 2015
AbstractWe reviewed chemical evolution of galaxies using our cosmological simulations.
Chiaki Kobayashi, Philip Taylor
openaire   +1 more source

Chemical abundances in the dwarf galaxy NGC 4163 based on the nebular and auroral emission lines / [PDF]

, 2022
We constructed an oxygen abundance map and N/O ratio map of the unusually low excitation dwarf irregular galaxy NGC 4163 based on publicly available spectroscopy obtained by the MaNGA survey.
L. S. Pilyugin, Zinchenko, I. A., Pilyugin, L. S., I. A. Zinchenko, Zinchenko, I. A.,, Pilyugin, Leonid,   +5 more
core   +1 more source

The abundance of dark galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2002
We show that gas in a large fraction of low mass dark matter halos may form Toomre stable disks, if angular momentum is conserved when the gas contracts. Such halos would be stable to star formation and therefore remain dark. This may potentially explain the discrepancy between the predicted and observed number of dwarf satellites in the Local Group ...
Verde, Licia, Oh, S. Peng, Jimenez, Raul
openaire   +2 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

Abundance of Substructure in Clusters of Galaxies

The Astrophysical Journal, 2004
It is widely recognized that cold dark matter models predict abundant dark matter substructure in halos of all sizes. Galaxy-galaxy lensing provides a unique opportunity to directly measure the presence and the mass of such substructures in clusters of galaxies.
Natarajan, P., Springel, V.
openaire   +3 more sources