Zobrazeno 1 - 10
of 714
pro vyhledávání: '"Hesser, J."'
Publikováno v:
Journal of Instrumentation, Volume 18, January 2023
Imaging distributions of radioactive sources plays a substantial role in nuclear medicine as well as in monitoring nuclear waste and its deposit. Coded Aperture Imaging has been proposed as an alternative to parallel or pinhole collimators, but requi
Externí odkaz:
http://arxiv.org/abs/2204.14113
Autor:
Shao, H., Roelke, Ch., Emmerich, K., Popp, T., Koeniger, F., Schuhmann, R., Wieczorek, K., Hesser, J.
Publikováno v:
Rock Mechanics & Rock Engineering; Jun2024, Vol. 57 Issue 6, p4355-4365, 11p
Autor:
Smith, V. V., Hinkle, K. H., Cunha, K., Plez, B., Lambert, D. L., Pilachowski, C. A., Barbuy, B., Melendez, J., Balachandran, S., Bessell, M. S., Geisler, D. P., Hesser, J. E., Winge, C.
High-resolution infrared spectra (R=50,000) have been obtained for twelve red-giant members of the LMC with the Gemini South 8.3-meter telescope plus Phoenix spectrometer. Quantitative chemical abundances of carbon-12, carbon-13, nitrogen-14, and oxy
Externí odkaz:
http://arxiv.org/abs/astro-ph/0208417
Deep HST/WFPC2 (V,I) photometry is used to investigate the globular cluster system (GCS) in NGC 4874, the central cD galaxy of the Coma cluster. The luminosity function of the clusters displays its normal Gaussian-like shape and turnover level. Other
Externí odkaz:
http://arxiv.org/abs/astro-ph/9912095
We have used deep HST/WFPC2 images in V (F606W) and I (F814W) to measure the luminosity distribution of the globular clusters in NGC 4874, the central cD galaxy of the Coma cluster. We find the ``turnover'' point of the globular cluster luminosity fu
Externí odkaz:
http://arxiv.org/abs/astro-ph/9911206
We present V, V-I color-magnitude diagrams (CMDs) for three old star clusters in the Large Magellanic Cloud (LMC): NGC 1466, NGC 2257 and Hodge 11. Our data extend about 3 magnitudes below the main-sequence turnoff, allowing us to determine accurate
Externí odkaz:
http://arxiv.org/abs/astro-ph/9911187
Akademický článek
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Autor:
Carlberg, R. G., Yee, H. K. C., Ellingson, E., Morris, S. L., Lin, H., Sawicki, M., Patton, D., Wirth, G., Abraham, R., Gravel, P., Pritchet, C. J., Smecker-Hane, T., Schade, D., Hartwick, F. D. A., Hesser, J. E., Hutchings, J. B., Oke, J. B.
The CNOC redshift survey of galaxy clusters measures Omega_M from Omega_e(z)= M/L x j/\rho_c which can be applied on a cluster-by-cluster basis. The mass-to-light ratios, M/L, are estimated from rich galaxy clusters, corrected to the field population
Externí odkaz:
http://arxiv.org/abs/astro-ph/9804312
Autor:
Carlberg, R. G., Yee, H. K. C., Lin, H., Sawicki, M., Shepherd, C. W., Ellingson, E., Morris, S. L., Schade, D., Hesser, J. E., Hutchings, J. B., Oke, J. B., Patton, D., Wirth, G., Balogh, M., Hartwick, F. D. A., Pritchet, C. J., Abraham, R., Smecker-Hane, T.
The CNOC1 cluster survey measures Omega_M via Oort's method, Omega_M= M/L x j/rho_c, where M/L is the field mass-to-light ratio, j is the field luminosity density and rho_c is the closure density. A wide range of potential systematic effects are expl
Externí odkaz:
http://arxiv.org/abs/astro-ph/9711272
Publikováno v:
Publ.Astron.Soc.Pac.109:907-919,1997
We compare our compilation of the W' calcium index for 71 Galactic globular clusters to the widely used Zinn and West (1984 ApJS, 55, 45) [Fe/H] scale and to Carretta and Gratton's (1997 A&A Supplement 121, 95) scale from high-dispersion spectra anal
Externí odkaz:
http://arxiv.org/abs/astro-ph/9707068