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29 March 2024 |
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A meta-analysis of cosmic star-formation history | David W. Hogg
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16 May 2001 | Subject: | astro-ph | Affiliation: | NYU | Abstract: | A meta-analysis is performed of the literature on evolution in cosmic star-formation rate density from redshift unity to the present day. The measurements are extremely diverse, including radio, infrared, and ultraviolet broad-band photometric indicators, and visible and near-ultraviolet line-emission indicators. Although there is large scatter among indicators at any given redshift, virtually all studies find a significant decrease from redshift unity to the present day. This is the most heterogeneously confirmed result in the study of galaxy evolution. When comoving star-formation rate density is treated as being proportional to $(1+z)^{eta}$, the meta-analysis gives a best-fit exponent and conservative confidence interval of $eta= 2.7pm 0.7$ in a world model with $(Omega_M,Omega_{Lambda})=(0.3,0.7)$ and $eta= 3.3pm 0.8$ in $(Omega_M,Omega_{Lambda})=(1.0,0.0)$. In either case these evolutionary trends are strong enough that the bulk of the stellar mass at the present day ought to be in old ($>6 mathrm{Gyr}$) populations. | Source: | arXiv, astro-ph/0105280 | Services: | Forum | Review | PDF | Favorites |
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