Kwok Yung Lo

Learn More
As part of a 4-year Cosmology and Particle Astrophysics (CosPA) Research Excellence Initiative in Taiwan, AMiBA − a 19-element dual-channel 85-105 GHz interferometer array is being specifically built to search for high redshift clusters of galaxies via the Sunyaev-Zeldovich Effect (SZE). In addition, AMiBA will have full polarization capabilities, in order(More)
The Submillimeter Array (SMA), a collaborative project of the Smithsonian Astrophysical Observatory (SAO) and the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), has begun operation on Mauna Kea in Hawaii. A total of eight 6-m telescopes comprise the array, which will cover the frequency range of 180-900 GHz. All eight telescopes have been(More)
Observations of molecular hydrogen in quasar host galaxies at high redshifts provide fundamental constraints on galaxy evolution, because it is out of this molecular gas that stars form. Molecular hydrogen is traced by emission from the carbon monoxide molecule, CO; cold H2 itself is generally not observable. Carbon monoxide has been detected in about ten(More)
Although it is widely accepted that most galaxies have supermassive black holes at their centres, concrete proof has proved elusive. Sagittarius A* (Sgr A*), an extremely compact radio source at the centre of our Galaxy, is the best candidate for proof, because it is the closest. Previous very-long-baseline interferometry observations (at 7 mm wavelength)(More)
It has long been recognized that interactions between galaxies are important in determining their evolution. The distribution of gas--out of which new stars are formed--is strongly affected; in particular, gas may be concentrated near the nucleus, leading to a burst of star formation. Here we present a map of atomic hydrogen (H I) in the nearest interacting(More)
We present CO(J=1→0) observations of the high–redshift quasi–stellar objects (QSOs) BR12020725 (z = 4.69), PSSJ2322+1944 (z = 4.12), and APM08279+5255 (z = 3.91) using the NRAO Green Bank Telescope (GBT) and the MPIfR Effelsberg 100m telescope. We detect, for the first time, the CO ground–level transition in BR1202-0725. For PSS J2322+1944 and(More)
Sagittarius (Sgr) A(*) is a unique radio source located at the center of our galaxy. The radiation from Sgr A(*) may be generated in matter accreting onto a massive black hole. In observations at long wavelengths, the apparent angular size of Sgr A(*) decreases in the manner expected for emission from a point source scattered by electron density(More)
We report here a factor of 5.7 higher total CO flux in Arp 244 (the “Antennae” galaxies) than that previously accepted in the literature (thus a total molecular gas mass of 1.5×10 M⊙), based on our fully sampled CO(1-0) observations at the NRAO 12m telescope. Currently, much of the understanding and modeling of the star formation in Arp 244 has been derived(More)
We have detected emission by the CO(5–4) and (6–5) rotational transitions at from the z p 5.7722 0.0006 host galaxy of the SDSS quasar J0927 2001 using the Plateau de Bure Interferometer. The peak line flux density for the CO(5–4) line is mJy, with a line FWHM p 610 110 km s . The implied molecular gas 1 0.72 0.09 mass is M . We also detect the 90 GHz(More)