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Observations of Dense Molecular Gas in a Quasar Host Galaxy at z=6.42: Further Evidence for a Non-Linear Dense Gas - Star Formation Relation at Early Cosmic Times
Dominik A. Riechers, Fabian Walter, Christopher L. Carilli +1
We report a sensitive search for the HCN(J=2-1) emission line towards SDSS J1148+5251 at z=6.42 with the VLA. HCN emission is a star formation indicator, tracing dense molecular hy…
New insights on the dense molecular gas in NGC253 as traced by HCN and HCO+
K. K. Knudsen, F. Walter, A. Weiss +3
We have imaged the central ~1kpc of the circumnuclear starburst disk in the galaxy NGC253 in the HCN(1-0), HCO+(1-0), and CO(1-0) transitions at 60pc resolution using the Owens Val…
Black hole masses and enrichment of z ~ 6 SDSS quasars
Jaron D. Kurk, Fabian Walter, Xiaohui Fan +7
We present sensitive near-infrared spectroscopic observations for a sample of five z ~ 6 quasars. These are amongst the most distant, currently known quasars in the universe. The s…
High Sensitivity Array Observations of the QSO BRI 1335-0417
E. Momjian, C. L. Carilli, D. A. Riechers +1
We present sensitive phase-referenced VLBI results on the radio continuum emission from the QSO BRI 1335--0417. The observations were carried out at 1.4 GHz using the High…
Detection of Emission from the CN Radical in the Cloverleaf Quasar at z=2.56
Dominik A. Riechers, Fabian Walter, Pierre Cox +4
We report the detection of CN(N=3-2) emission towards the Cloverleaf quasar (z=2.56) based on observations with the IRAM Plateau de Bure Interferometer. This is the first clear det…