An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: Source catalogue and properties
| Autor: | Stach, S. M., Dudzevičiūtė, U., Smail, I., Swinbank, A. M., Geach, J. E., Simpson, J. M., An, F. X., Almaini, O., Arumugam, V., Blain, A. W., Chapman, S. C., Chen, C. -C., Conselice, C. J., Cooke, E. A., Coppin, K. E. K., da Cunha, E., Dunlop, J. S., Farrah, D., Gullberg, B., Hodge, J. A., Ivison, R. J., Kocevski, Dale D., Michałowski, M. J., Miyaji, Takamitsu, Scott, D., Thomson, A. P., Wardlow, J. L., Weiss, Axel, van der Werf, P. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stz1536 |
| Popis: | We present the catalogue and properties of sources in AS2UDS, an 870-$\mu$m continuum survey with the Atacama Large Millimetre/sub-millimetre Array (ALMA) of 716 single-dish sub-millimetre sources detected in the UKIDSS/UDS field by the SCUBA-2 Cosmology Legacy Survey. In our sensitive ALMA follow-up observations we detect 708 sub-millimetre galaxies (SMGs) at $>$\,4.3$\sigma$ significance across the $\sim$\,1-degree diameter field. We combine our precise ALMA positions with the extensive multi-wavelength coverage in the UDS field to fit the spectral energy distributions of our SMGs to derive a median redshift of $z_{\rm phot}=$\,2.61$\pm$0.09. This large sample reveals a statistically significant trend of increasing sub-millimetre flux with redshift suggestive of galaxy downsizing. 101 ALMA maps do not show a $>$\,4.3$\sigma$ SMG, but we demonstrate from stacking {\it Herschel} SPIRE observations at these positions, that the vast majority of these blank maps correspond to real single-dish sub-millimetre sources. We further show that these blank maps contain an excess of galaxies at $z_{\rm phot}=$\,1.5--4 compared to random fields, similar to the redshift range of the ALMA-detected SMGs. In addition, we combine X-ray and mid-infrared active galaxy nuclei activity (AGN) indicators to yield a likely range for the AGN fraction of 8--28\,\% in our sample. Finally, we compare the redshifts of this population of high-redshift, strongly star-forming galaxies with the inferred formation redshifts of massive, passive galaxies being found out to $z\sim$\,2, finding reasonable agreement -- in support of an evolutionary connection between these two classes of massive galaxy. Comment: Submitted to MNRAS; Comments welcome. Full catalogue will be made publicly available on acceptance of paper |
| Databáze: | arXiv |
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