ﻻ يوجد ملخص باللغة العربية
We present new near-IR and optical spectroscopic observations which confirm the redshift of the z=1.44 extremely red object ERO J164502+4626.4 (object 10 of Hu & Ridgway 1994) and a HST image which reveals a reflected-S-shaped morphology at (rest-frame) near-UV wavelengths. The contrast between the rest-frame far-red (8200-9800A) and near-UV (2900-3900A) morphologies suggests that the central regions of the galaxy are heavily obscured by dust and that the galaxy is most likely an interacting or disturbed system. We also present new photometry of this object at 450, 850 and 1350 microns obtained using SCUBA on the JCMT. The rest-frame SED of this ERO is best understood in terms of a highly reddened stellar population with ongoing star formation, as originally suggested by Graham & Dey (1996). The new sub-mm data presented here indicate that the remarkable similarity to ultraluminous infrared galaxies (ULIRGs) such as Arp220 extends into the rest-frame far-IR which bears the signature of thermal emission from dust. ERO J164502+4626.4 is extremely luminous (7E12 Lsun) and dusty (M[dust] = 7E8 Msun). If its luminosity is powered by young hot stars, then ERO J164502+4626.4 is forming stars at the prodigious rate of 1000-2000 Msun/yr. We conclude that it is a distant analogue of the nearby ULIRG population, the more distant or less luminous counterparts of which may be missed by even the deepest existing optical surveys. The sub-mm emitters recently discovered by deep SCUBA surveys may be galaxies similar to ERO J164502+4626.4 (but perhaps more distant). This population of extremely dusty galaxies may also contribute significantly to the cosmic sub-mm background emission.
We measure the local galaxy far-infrared (FIR) 60-to-100 um colour-luminosity distribution using an all-sky IRAS survey. This distribution is an important reference for the next generation of FIR--submillimetre surveys that have and will conduct deep
At the center of the Milky Way, with a distance of ~8 kpc, the compact source Sagittarius A* (SgrA*) can be associated with a super massive black hole of ~4x10^6 solar masses. SgrA* shows strong variability from the radio to the X-ray wavelength doma
Deep surveys of the sky at millimeter wavelengths have revealed a population of ultra-luminous infrared galaxies (ULIRGs) at high redshifts. These appear similar to local objects of similar luminosities (such as Arp220) but are much more ``important
Deep surveys in the far-infrared and sub-millimeter wavebands are revealing a new phase of galactic evolution hidden by dust. Observations with SCUBA on the JCMT show that 25% of the COBE/FIRAS background at 850 microns is being produced by high lumi
We study the environments of 49 WISE/NVSS-selected dusty, hyper-luminous, z~2 quasars using the Atacama Large Millimeter/Sub-millimeter Array (ALMA) 345GHz images. We find that 17 of the 49 WISE/NVSS sources show additional sub-mm galaxies within the