تقرير
The East Asian Observatory SCUBA--2 survey of the COSMOS field: unveiling 1147 bright sub-millimeter sources across 2.6 square degrees
| العنوان: | The East Asian Observatory SCUBA--2 survey of the COSMOS field: unveiling 1147 bright sub-millimeter sources across 2.6 square degrees |
|---|---|
| المؤلفون: | Simpson, J. M., Smail, Ian, Swinbank, A. M., Chapman, S. C., Chen, Chian-Chou, Geach, J. E., Matsuda, Y., Wang, R., Wang, Wei-Hao, Yang, Y., Ao, Y., Asquith, R., Bourne, N., Coogan, R. T., Coppin, K., Gullberg, B., Hine, N. K., Ho, L. C., Hwang, H. S., Ivison, R. J., Kato, Y., Lacaille, K., Lewis, A. J. R., Liu, D., Michałowski, M. J., Oteo, I., Sawicki, M., Scholtz, J., Smith, D., Thomson, A. P., Wardlow, J. L. |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We present sensitive 850$\mu$m imaging of the COSMOS field using 640hr of new and archival observations taken with SCUBA-2 at the East Asian Observatory's James Clerk Maxwell Telescope. The SCUBA-2 COSMOS survey (S2COSMOS) achieves a median noise level of $\sigma_{850\mu{\mathrm{m}}}$=1.2mJy/beam over an area of 1.6 sq. degree (MAIN; HST/ACS footprint), and $\sigma_{850\mu{\mathrm{m}}}$=1.7mJy/beam over an additional 1 sq. degree of supplementary (SUPP) coverage. We present a catalogue of 1020 and 127 sources detected at a significance level of >4$\sigma$ and >4.3$\sigma$ in the MAIN and SUPP regions, respectively, corresponding to a uniform 2% false-detection rate. We construct the single-dish 850$\mu$m number counts at $S_{850}$>2mJy and show that these S2COSMOS counts are in agreement with previous single-dish surveys, demonstrating that degree-scale fields are sufficient to overcome the effects of cosmic variance in the $S_{850}$=2-10mJy population. To investigate the properties of the galaxies identified by S2COSMOS sources we measure the surface density of near-infrared-selected galaxies around their positions and identify an average excess of 2.0$\pm$0.2 galaxies within a 13$''$ radius (~100kpc at $z$~2). The bulk of these galaxies represent near-infrared-selected SMGs and/or spatially-correlated sources and lie at a median photometric redshift of $z$=2.0$\pm$0.1. Finally, we perform a stacking analysis at sub-millimeter and far-infrared wavelengths of stellar-mass-selected galaxies ($M_{\star}$=10$^{10}$-10$^{12}{\rm M_{\odot}}$) from $z$=0-4, obtaining high-significance detections at 850um in all subsets (SNR=4-30), and investigate the relation between far-infrared luminosity, stellar mass, and the peak wavelength of the dust SED. The publication of this survey adds a new deep, uniform sub-millimeter layer to the wavelength coverage of this well-studied COSMOS field. Comment: Published in ApJ July 2019 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/ab23ff |
| URL الوصول: | http://arxiv.org/abs/1912.02229 |
| رقم الأكسشن: | edsarx.1912.02229 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/ab23ff |
|---|