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18 April 2024 |
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Ultradeep Near-Infrared Observations of GOODS 850-5 | | Wei-Hao Wang
; Amy J. Barger
; Lennox L. Cowie
; | | Date: |
22 May 2008 | | Abstract: | 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. | | Source: | arXiv, 0805.3503 | | Services: | Forum | Review | PDF | Favorites | |
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