Ultradeep Near-Infrared Observations of GOODS 850-5
| dc.creator | Wang, Wei-Hao | |
| dc.creator | Barger, Amy J. | |
| dc.creator | Cowie, Lennox L. | |
| dc.date | 2008-05-22 | |
| dc.date | 2008-08-26 | |
| dc.date.accessioned | 2026-07-07T12:14:33Z | |
| dc.date.available | 2026-07-07T12:14:33Z | |
| dc.description | GOODS 850-5 is a hyperluminous radio-faint submillimeter source in the GOODS-N. Although it is generally agreed that GOODS 850-5 is at a high redshift z>~4, its exact redshift is unknown. While its stellar SED suggests z~6, its radio/FIR SED suggests a lower redshift of z~4. To better constrain its stellar SED and redshift, we carried out nano-Jansky sensitivity ultradeep NIR observations between 1.2 and 2.1 um with the HST and the 8 m Subaru Telescope. Even with such great depths we did not detect GOODS 850-5, and the results show that it is an extremely curious source. Between the Ks and 3.6 um bands its spectral slope is >3x that of an ERO, and the flux ratio between the two bands is >8x that of Lyman breaks. It is quite challenging to explain this unusually red color without a Lyman break (which would imply z>17). It requires a large amount (M* ~ 10^11.5 Msun) of reddened old stars at z~6, coexisting with an even more extinguished violent ~2400-4400 Msun/yr starburst, which does not have any associated detectable rest-frame UV radiation. We discuss the discrepancy between the NIR and radio/FIR photometric redshifts. We conclude that GOODS 850-5 is at least at z>4 and is more likely at z>~6. We describe the unusual properties of GOODS 850-5, including its SED and formation history, and we discuss the implications of such massive z>6 galaxies. | |
| dc.description | 12 pages, 9 figures, ApJ accepted | |
| dc.identifier | https://arxiv.org/abs/0805.3503 | |
| dc.identifier | http://arxiv.org/abs/0805.3503 | |
| dc.identifier | Astrophys.J.690:319-329,2009 | |
| dc.identifier | doi:10.1088/0004-637X/690/1/319 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/211232 | |
| dc.subject | Astrophysics | |
| dc.title | Ultradeep Near-Infrared Observations of GOODS 850-5 | |
| dc.type | text |