تقرير
Identification of z~>2 Herschel 500 micron sources using color-deconfusion
| العنوان: | Identification of z~>2 Herschel 500 micron sources using color-deconfusion |
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| المؤلفون: | Shu, X. W., Elbaz, D., Bourne, N., Schreiber, C., Wang, T., Dunlop, J. S., Fontana, A., Leiton, R., Pannella, M., Okumura, K., Michalowski, M. J., Santini, P., Merlin, E., Buitrago, F., Bruce, V. A., Amorin, R., Castellano, M., Derriere, S., Comastri, A., Cappelluti, N., Wang, J. X., Ferguson, H. C. |
| سنة النشر: | 2015 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We present a new method to search for candidate z~>2 Herschel 500{\mu}m sources in the GOODS-North field, using a S500{\mu}m/S24{\mu}m "color deconfusion" technique. Potential high-z sources are selected against low-redshift ones from their large 500{\mu}m to 24{\mu}m flux density ratios. By effectively reducing the contribution from low-redshift populations to the observed 500{\mu}m emission, we are able to identify counterparts to high-z 500{\mu}m sources whose 24{\mu}m fluxes are relatively faint. The recovery of known z~4 starbursts confirms the efficiency of this approach in selecting high-z Herschel sources. The resulting sample consists of 34 dusty star-forming galaxies at z~>2. The inferred infrared luminosities are in the range 1.5x10^12-1.8x10^13 Lsun, corresponding to dust-obscured star formation rates (SFRs) of ~260-3100 Msun/yr for a Salpeter IMF. Comparison with previous SCUBA 850{\mu}m-selected galaxy samples shows that our method is more efficient at selecting high-z dusty galaxies with a median redshift of z=3.07+/-0.83 and 10 of the sources at z~>4. We find that at a fixed luminosity, the dust temperature is ~5K cooler than that expected from the Td-LIR relation at z<1, though different temperature selection effects should be taken into account. The radio-detected subsample (excluding three strong AGN) follows the far-infrared/radio correlation at lower redshifts, and no evolution with redshift is observed out to z~5, suggesting that the far-infrared emission is star formation dominated. The contribution of the high-z Herschel 500{\mu}m sources to the cosmic SFR density is comparable to that of SMG populations at z~2.5 and at least 40% of the extinction-corrected UV samples at z~4 (abridged). Comment: 33 pages in emulateapj format, 24 figures, 2 tables, accepted for publication in the ApJS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/0067-0049/222/1/4 |
| URL الوصول: | http://arxiv.org/abs/1512.00167 |
| رقم الأكسشن: | edsarx.1512.00167 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/0067-0049/222/1/4 |
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