%0 Generic %1 Carilli2011 %A Carilli, C. L. %A Hodge, J. %A Walter, F. %A Riechers, D. %A Daddi, E. %A Dannerbauer, H. %A Morrison, G. %D 2011 %K CO cluster high-z %T EVLA observations of a proto-cluster of molecular gas rich galaxies at z = 4.05 %U http://arxiv.org/abs/1105.2451 %X We present observations of the molecular gas in the GN20 proto-cluster of galaxies at $z =4.05$ using the Expanded Very Large Array (EVLA). This group of galaxies is the ideal laboratory for studying the formation of massive galaxies via luminous, gas-rich starbursts within 1.6 Gyr of the Big Bang. We detect three galaxies in the proto-cluster in CO 2-1 emission, with gas masses (H$_2$) between $10^10$ and $10^11 (\alpha/0.8)$ M$_ødot$. The emission from the brightest source, GN20, is resolved with a size $2"$, and has a clear north-south velocity gradient, possibly indicating ordered rotation. The gas mass in GN20 is comparable to the stellar mass ($1.310^11 \times (\alpha/0.8)$ M$_ødot$ and $2.310^11$ M$_ødot$, respectively), and the sum of gas plus stellar mass is comparable to the dynamical mass of the system ($3.410^11 sin(i)/sin(45^o)^-2$ M$_ødot$), within a 5kpc radius. There is also evidence for a tidal tail extending another $2"$ north of the galaxy with a narrow velocity dispersion. GN20 may be a massive, gas rich disk that is gravitationally disturbed, but not completely disrupted. There is one Lyman-break galaxy (BD29079) in the GN20 proto-cluster with an optical spectroscopic redshift within our search volume, and we set a 3$\sigma$ limit to the molecular gas mass of this galaxy of $1.110^10 \times (\alpha/0.8)$ M$_ødot$.

@misc{Carilli2011, abstract = { We present observations of the molecular gas in the GN20 proto-cluster of galaxies at $z =4.05$ using the Expanded Very Large Array (EVLA). This group of galaxies is the ideal laboratory for studying the formation of massive galaxies via luminous, gas-rich starbursts within 1.6 Gyr of the Big Bang. We detect three galaxies in the proto-cluster in CO 2-1 emission, with gas masses (H$_2$) between $10^{10}$ and $10^{11} \times (\alpha/0.8)$ M$_\odot$. The emission from the brightest source, GN20, is resolved with a size $\sim 2"$, and has a clear north-south velocity gradient, possibly indicating ordered rotation. The gas mass in GN20 is comparable to the stellar mass ($1.3\times 10^{11} \times (\alpha/0.8)$ M$_\odot$ and $2.3\times 10^{11}$ M$_\odot$, respectively), and the sum of gas plus stellar mass is comparable to the dynamical mass of the system ($\sim 3.4\times 10^{11} [sin(i)/sin(45^o)]^{-2}$ M$_\odot$), within a 5kpc radius. There is also evidence for a tidal tail extending another $2"$ north of the galaxy with a narrow velocity dispersion. GN20 may be a massive, gas rich disk that is gravitationally disturbed, but not completely disrupted. There is one Lyman-break galaxy (BD29079) in the GN20 proto-cluster with an optical spectroscopic redshift within our search volume, and we set a 3$\sigma$ limit to the molecular gas mass of this galaxy of $1.1\times 10^{10} \times (\alpha/0.8)$ M$_\odot$. }, added-at = {2011-05-14T22:31:34.000+0200}, author = {Carilli, C. L. and Hodge, J. and Walter, F. and Riechers, D. and Daddi, E. and Dannerbauer, H. and Morrison, G.}, biburl = {https://www.bibsonomy.org/bibtex/2edca1b210b36cafd99a7474718196de2/miki}, description = {[1105.2451] EVLA observations of a proto-cluster of molecular gas rich galaxies at z = 4.05}, interhash = {555813255c3d428429bfd365d258fcd1}, intrahash = {edca1b210b36cafd99a7474718196de2}, keywords = {CO cluster high-z}, note = {cite arxiv:1105.2451 Comment: AAStex format, 4 figures; prepared for the ApJ Letters EVLA special issue}, timestamp = {2011-05-14T22:31:34.000+0200}, title = {EVLA observations of a proto-cluster of molecular gas rich galaxies at z = 4.05}, url = {http://arxiv.org/abs/1105.2451}, year = 2011 }