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Full-Text Articles in Physical Sciences and Mathematics
Neutral Hydrogen Clouds In The M81/M82 Group, Katie M. Chynoweth, Glen I. Langston, Min S. Yun, Felix J. Lockman, K H R Rubin, Sarah A. Scoles
Neutral Hydrogen Clouds In The M81/M82 Group, Katie M. Chynoweth, Glen I. Langston, Min S. Yun, Felix J. Lockman, K H R Rubin, Sarah A. Scoles
Min S. Yun
We have observed a 3° × 3° area centered on the M81/M82 group of galaxies using the Robert C. Byrd Green Bank Telescope in a search for analogs to the high-velocity clouds of neutral hydrogen found around our Galaxy. The velocity range from –605 to –85 km s–1 and from 25 to 1970 km s–1 was searched for H I clouds. Over the inner 2° × 2° the 7σ detection threshold was 9.6 × 105 M sun. We detect five previously unknown H I clouds associated with the group, as well as numerous associated filamentary H I structures, all lying …
Influences Of Cadmium And Zinc Interaction And Humic Acid On Metal Accumulation In Ceratophyllum Demersum, S Bunluesin, P Pokethitiyook, Gr Lanza, Jf Tyson, M Kruatrachue, Bs Xing, S Upatham
Influences Of Cadmium And Zinc Interaction And Humic Acid On Metal Accumulation In Ceratophyllum Demersum, S Bunluesin, P Pokethitiyook, Gr Lanza, Jf Tyson, M Kruatrachue, Bs Xing, S Upatham
Chemistry Department Faculty Publication Series
No abstract provided.
Morphological Transformation From Galaxy Harassment, B Moore, G Lake, N Katz
Morphological Transformation From Galaxy Harassment, B Moore, G Lake, N Katz
Astronomy Department Faculty Publication Series
Galaxy morphologies in clusters have undergone a remarkable transition over the past several billion yr. Distant clusters at z ~ 0.4 are filled with small spiral galaxies, many of which are disturbed and show evidence of multiple bursts of star formation. This population is absent from nearby clusters, where spheroidals comprise the faint end of the luminosity function. Our numerical simulations follow the evolution of disk galaxies in a rich cluster resulting from encounters with brighter galaxies and the cluster's tidal field, or "galaxy harassment." After a bursting transient phase, they undergo a complete morphological transformation from "disks" to "spheroidals." …
The Formation Of Quasars In Low-Luminosity Hosts Via Galaxy Harassment, G Lake, N Katz, B Moore
The Formation Of Quasars In Low-Luminosity Hosts Via Galaxy Harassment, G Lake, N Katz, B Moore
Astronomy Department Faculty Publication Series
We have simulated disk galaxies undergoing continual bombardment by other galaxies in a rich cluster. "Galaxy harassment" leads to dramatic evolution of smaller disk galaxies and provides an extremely effective mechanism for fueling a central quasar. Within a few billion years after a small disk galaxy enters the cluster environment, up to 90% of its gas can be driven into the inner 500 pc. Up to half of the mass can be transferred in a burst lasting just 100-200 Myr. This transport of gas to the center of galaxy is far more efficient than any mechanism proposed before. Galaxy harassment …
Extended Molecular Gas Distribution In Mrk 273 And Merger-Luminosity Evolution, Min S. Yun, N Z. Scoville
Extended Molecular Gas Distribution In Mrk 273 And Merger-Luminosity Evolution, Min S. Yun, N Z. Scoville
Min S. Yun
We present the first interferometric measurement of CO emission (θ ~ 2'') from the ultraluminous infrared galaxy Mrk 273. A total H2 mass of 3.6 × 1010 Msun is inferred from the CO observations, half of which belongs to an extended component with deconvolved size 5.1 × 2.5 kpc. In addition, an unresolved molecular gas complex is found to be coincident with the optical nucleus. The inferred H2 mass, size (R ~ 380 pc), and mean surface mass density (ΣH2 ≥ 4 × 104 Msun pc-3) of this complex, as well as the IR luminosity, are very similar to those …