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Full-Text Articles in Physical Sciences and Mathematics
Pressure Support Versus Thermal Broadening In The Lyman Alpha Forest - I. Effects Of The Equation Of State On Longitudinal Structure, Ms Peeples, Dh Weinberg, R Dave, Ma Fardal, N Katz
Pressure Support Versus Thermal Broadening In The Lyman Alpha Forest - I. Effects Of The Equation Of State On Longitudinal Structure, Ms Peeples, Dh Weinberg, R Dave, Ma Fardal, N Katz
Astronomy Department Faculty Publication Series
In the low-density intergalactic medium that gives rise to the Lyman α (Lyα) forest, gas temperature and density are tightly correlated. The velocity scale of thermal broadening and the Hubble flow across the gas Jeans scale are of similar magnitude (HλJ∼σth). To separate the effects of gas pressure support and thermal broadening on the Lyα forest, we compare spectra extracted from two smoothed particle hydrodynamics simulations evolved with different photoionization heating rates (and thus different Jeans scales) and from the pressureless dark matter distribution, imposing different temperature–density relations on the evolved particle distributions. The …
Aztec Half Square Degree Survey Of The Shades Fields - I. Maps, Catalogues And Source Counts, Je Austermann, Min Yun, Et. Al.
Aztec Half Square Degree Survey Of The Shades Fields - I. Maps, Catalogues And Source Counts, Je Austermann, Min Yun, Et. Al.
Astronomy Department Faculty Publication Series
We present the first results from the largest deep extragalactic mm-wavelength survey undertaken to date. These results are derived from maps covering over 0.7 deg2, made at λ= 1.1 mm, using the AzTEC continuum camera mounted on the James Clerk Maxwell Telescope. The maps were made in the two fields originally targeted at λ= 850 μm with the Submillimetre Common-User Bolometer Array (SCUBA) in the SCUBA Half-Degree Extragalactic Survey (SHADES) project, namely the Lockman Hole East (mapped to a depth of 0.9–1.3 mJy rms) and the Subaru/XMM–Newton Deep Field (mapped to a depth of 1.0–1.7 mJy rms). …