%0 Generic %1 thomson2015tracing %A Thomson, A. P. %A Ivison, R. J. %A Owen, Frazer N. %A Danielson, A. L. R %A Swinbank, A. M. %A Smail, Ian %D 2015 %K clump gas high-z molecular star %T Tracing cool molecular gas and star formation on $100$pc scales within a $z=2.3$ galaxy %U http://arxiv.org/abs/1501.04624 %X We present new, high-angular resolution interferometric observations with the Karl G. Jansky Very Large Array of $^12$CO $J=1-0$ line emission and 4-8 GHz continuum emission in the strongly lensed, $z=2.3$ submillimetre galaxy, SMM J21352-0102. Using these data, we identify and probe the conditions in $\sim 100$pc clumps within this galaxy, which we consider to be potential giant molecular cloud complexes, containing up to half of the total molecular gas in this system. In combination with far-infrared and submillimetre data, we investigate the far-infrared/radio correlation, measuring $q_IR = 2.39 \pm 0.17$ across SMM J21352. We search for variations in the properties of the interstellar medium throughout the galaxy by measuring the spatially-resolved $q_IR$ and radio spectral index, $\alpha_radio$, finding ranges $q_IR = 2.1, 2.6$ and $\alpha_radio = -1.5, -0.7$. We argue that these ranges in $\alpha_radio$ and $q_IR$ may reflect variations in the age of the ISM material. Using multi-$J$ $^12$CO data, we quantitatively test a recent theoretical model relating the star-formation rate surface density to the excitation of $^12$CO, finding good agreement between the model and the data. Lastly, we study the Schmidt-Kennicutt relation, both integrated across the system and within the individual clumps. We find small offsets between SMM J21352 and its clumps relative to other star-forming galaxy populations on the Schmidt-Kennicutt plot - such offsets have previously been interpreted as evidence for a bi-modal star-formation law, but we argue that they can be equally-well explained as arising due to a combination of observational uncertainties and systematic biases in the choice of model used to interpret the data.

@misc{thomson2015tracing, abstract = {We present new, high-angular resolution interferometric observations with the Karl G. Jansky Very Large Array of $^{12}$CO $J=1-0$ line emission and 4-8 GHz continuum emission in the strongly lensed, $z=2.3$ submillimetre galaxy, SMM J21352-0102. Using these data, we identify and probe the conditions in $\sim 100$pc clumps within this galaxy, which we consider to be potential giant molecular cloud complexes, containing up to half of the total molecular gas in this system. In combination with far-infrared and submillimetre data, we investigate the far-infrared/radio correlation, measuring $q_{IR} = 2.39 \pm 0.17$ across SMM J21352. We search for variations in the properties of the interstellar medium throughout the galaxy by measuring the spatially-resolved $q_{IR}$ and radio spectral index, ${\alpha}_{\rm radio}$, finding ranges $q_{IR} = [2.1, 2.6]$ and ${\alpha}_{\rm radio} = [-1.5, -0.7]$. We argue that these ranges in ${\alpha}_{\rm radio}$ and $q_{IR}$ may reflect variations in the age of the ISM material. Using multi-$J$ $^{12}$CO data, we quantitatively test a recent theoretical model relating the star-formation rate surface density to the excitation of $^{12}$CO, finding good agreement between the model and the data. Lastly, we study the Schmidt-Kennicutt relation, both integrated across the system and within the individual clumps. We find small offsets between SMM J21352 and its clumps relative to other star-forming galaxy populations on the Schmidt-Kennicutt plot - such offsets have previously been interpreted as evidence for a bi-modal star-formation law, but we argue that they can be equally-well explained as arising due to a combination of observational uncertainties and systematic biases in the choice of model used to interpret the data.}, added-at = {2015-01-21T10:09:42.000+0100}, author = {Thomson, A. P. and Ivison, R. J. and Owen, Frazer N. and Danielson, A. L. R and Swinbank, A. M. and Smail, Ian}, biburl = {https://www.bibsonomy.org/bibtex/24ea5ac39a66bfb0c8c994c0a18b9e595/miki}, description = {[1501.04624] Tracing cool molecular gas and star formation on $\sim 100$pc scales within a $z=2.3$ galaxy}, interhash = {7e5a02d014bd70ca6ceb5ba84f57829a}, intrahash = {4ea5ac39a66bfb0c8c994c0a18b9e595}, keywords = {clump gas high-z molecular star}, note = {cite arxiv:1501.04624Comment: 15 pages, 5 colour figures; accepted for publication in MNRAS}, timestamp = {2015-01-21T10:09:42.000+0100}, title = {Tracing cool molecular gas and star formation on $\sim 100$pc scales within a $z=2.3$ galaxy}, url = {http://arxiv.org/abs/1501.04624}, year = 2015 }