SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES): Faint-end Counts at 450 μm
| Autor: | James E. Geach, Linhua Jiang, Wei-Hao Wang, Christopher J. Conselice, Chian-Chou Chen, Helmut Dannerbauer, Yu-Yen Chang, Yoshiki Toba, Junxian Wang, Ian Smail, Andrew Bunker, Ran Wang, Chen-Fatt Lim, James Dunlop, Douglas Scott, Nathan Bourne, Kotaro Kohno, Rob Ivison, Tomotsugu Goto, W. I. Cowley, Hyung Mok Lee, Elisabetta Valiante, Tadayuki Kodama, Omar Almaini, Chien-Hsu Lee, Julie Wardlow, James Simpson, Michał J. Michałowski, Yiping Ao, X. W. Shu, Xianzhong Zheng, Woong-Seob Jeong, Wei-Leong Tee, Xu Kong, Hyunjin Shim, Andrew Blain, Wei-Ching Lin, David L. Clements, Minju Lee, Marcin Sawicki, Ivan Oteo, Scott Chapman, Dani C.-Y. Chao |
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| Přispěvatelé: | Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
submillimeter: galaxies
0306 Physical Chemistry (Incl. Structural) REDSHIFT SUBMILLIMETER GALAXIES Population FOS: Physical sciences Astrophysics cosmic background radiation Astronomy & Astrophysics 01 natural sciences Power law 0305 Organic Chemistry Luminosity galaxies: high-redshift galaxies - cosmology 0103 physical sciences galaxies STAR-FORMING GALAXIES Surface brightness Noise level education DUSTY GALAXIES NUMBER COUNTS 010303 astronomy & astrophysics evolution - submillimeter Spatial density Physics education.field_of_study FORMATION HISTORY Science & Technology 010308 nuclear & particles physics Center (category theory) Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy 0201 Astronomical And Space Sciences high-redshift - galaxies Space and Planetary Science cosmology: cosmic background radiation LUMINOSITY FUNCTION Astrophysics of Galaxies (astro-ph.GA) FIELD-SOUTH Physical Sciences LENSING CLUSTERS P(D) FLUCTUATION ANALYSIS galaxies: evolution COSMOLOGY LEGACY SURVEY |
| Zdroj: | Astrophysical journal, 2017, Vol.850(1), pp.37 [Peer Reviewed Journal] Wang, W H, Lin, W C, Lim, C F, Smail, I, Chapman, S C, Zheng, X Z, Shim, H, Kodama, T, Almaini, O, Ao, Y, Blain, A W, Bourne, N, Bunker, A J, Chang, Y Y, Chao, D C Y, Chen, C C, Clements, D L, Conselice, C J, Cowley, W I, Dannerbauer, H, Dunlop, J S, Geach, J E, Goto, T, Jiang, L, Ivison, R J, Jeong, W S, Kohno, K, Kong, X, Lee, C H, Lee, H M, Lee, M, Michałowski, M J, Oteo, I, Sawicki, M, Scott, D, Shu, X W, Simpson, J M, Tee, W L, Toba, Y, Valiante, E, Wang, J X, Wang, R & Wardlow, J L 2017, ' SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) : Faint-end Counts at 450 μm ', Astrophysical Journal, vol. 850, no. 1, 37 . https://doi.org/10.3847/1538-4357/aa911b The Astrophysical Journal, 850(1). IOP PUBLISHING LTD |
| ISSN: | 0004-637X |
| DOI: | 10.3847/1538-4357/aa911b |
| Popis: | The SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) is a three-year JCMT Large Program aiming at reaching the 450 $\mu$m confusion limit in the COSMOS-CANDELS region, to study a representative sample of the high-redshift far-infrared galaxy population that gives rise to the bulk of the far-infrared background. We present the first-year data from STUDIES. We have reached a 450 $\mu$m noise level of 0.91~mJy for point sources at the map center, covered an area of 151 arcmin$^2$, and detected 98 and 141 sources at 4.0 and 3.5 $\sigma$, respectively. Our derived counts are best constrained in the 3.5-25 mJy regime using directly detected sources. Below the detection limits, our fluctuation analysis further constrains the slope of the counts down to 1 mJy. The resulting counts at 1-25 mJy are consistent with a power law having a slope of $-2.59$ ($\pm0.10$ for 3.5-25 mJy, and $^{+0.4}_{-0.7}$ for 1-3.5 mJy). There is no evidence of a faint-end termination or turn-over of the counts in this flux density range. Our counts are also consistent with previous SCUBA-2 blank-field and lensing cluster surveys. The integrated surface brightness from our counts down to 1 mJy is $90.0\pm17.2$ Jy deg$^{-2}$, which can account for up to $83^{+15}_{-16}\%$ of the COBE 450 $\mu$m background. We show that Herschel counts at 350 and 500 $\mu$m are significantly higher than our 450 $\mu$m counts, likely caused by its large beam and source clustering. High-angular resolution instruments like SCUBA-2 at 450 $\mu$m are therefore highly beneficial for measuring the luminosity and spatial density of high-redshift dusty galaxies. Comment: ApJ accepted. revised version uploaded |
| Databáze: | OpenAIRE |
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