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15 papers · 2 filters
The overdensities of galaxy environments as a function of luminosity and color
David W. Hogg, Michael R. Blanton, Daniel J. Eisenstein +9
We study the mean environments of galaxies in the Sloan Digital Sky Survey as a function of rest-frame luminosity and color. Overdensities in galaxy number are estimated in $8 h^{-…
Average spectra of massive galaxies in the SDSS
Daniel J. Eisenstein, David W. Hogg, Masataka Fukugita +17
We combine Sloan Digital Sky Survey spectra of 22,000 luminous, red, bulge-dominated galaxies to get high S/N average spectra in the rest-frame optical and ultraviolet (2600A to 70…
Gamma photometric redshifts for long gamma-ray bursts
Z. Bagoly, I. Csabai, A. Mészáros +4
It is known that the soft tail of the gamma-ray bursts' spectra show excesses from the exact power-law dependence. In this article we show that this departure can be detected in th…
Probing the structure of a birthplace of intermediate-mass stars: Ammonia cores in Lynds 1340
M. Kun, J. G. A. Wouterloot, L. V. T'oth
Lynds 1340, a molecular cloud forming intermediate-mass stars, has been mapped in the NH_3(1,1) and (2,2) transitions with the Effelsberg 100m telescope. We observed the whole area…
Photometric Redshifts for the SDSS Early Data Release
Istvan Csabai, Tamas Budavari, Andrew J. Connolly +12
The Early Data Release from the Sloan Digital Sky survey provides one of the largest multicolor photometric catalogs currently available to the astronomical community. In this pape…
Temporal variation of coupling constants and nucleosynthesis
H. Oberhummer, A. Csoto, M. Fairbairn +2
We investigate the triple-alpha process and the Oklo phenomenon to obtain constraints on possible cosmological time variations of fundamental constants. Specifically we study cosmo…