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Improved Modeling of the Mass Distribution of Disk Galaxies by the Einasto Halo Model
Laurent Chemin, W. J. G. de Blok, Gary A. Mamon
(Abridged) The analysis of the rotation curves (RCs) of spiral galaxies provides an efficient diagnostic for studying the properties of dark matter halos and their relations with t…
A Molecular Star Formation Law in the Atomic Gas Dominated Regime in Nearby Galaxies
Andreas Schruba, Adam K. Leroy, Fabian Walter +11
We use the IRAM HERACLES survey to study CO emission from 33 nearby spiral galaxies down to very low intensities. Using atomic hydrogen (HI) data, mostly from THINGS, we predict th…
Quantified HI Morphology III: Merger Visibility Times from HI in Galaxy Simulations
B. W. Holwerda, N. Pirzkal, T. J. Cox +5
Major mergers of disk galaxies are thought to be a substantial driver in galaxy evolution. To trace the fraction and the rate galaxies are in mergers over cosmic times, several obs…
Quantified HI Morphology V: HI Disks in the Virgo Cluster
B. W. Holwerda, N. Pirzkal, W. J. G. de Blok +1
We explore the quantified morphology of atomic hydrogen (HI) disks in the Virgo cluster. These galaxies display a wealth of phenomena in their Hi morphology, e.g., tails, truncatio…
Quantified HI Morphology IV: The Merger Fraction and Rate in WHISP
B. W. Holwerda, N. Pirzkal, W. J. G. de Blok +3
The morphology of the atomic hydrogen (HI) disk of a spiral galaxy is the first component to be disturbed by a gravitational interaction such as a merger between two galaxies. We u…
Quantified HI Morphology II : Lopsidedness and Interaction in WHISP Column Density Maps
B. W. Holwerda, N. Pirzkal, W. J. G. de Blok +4
Lopsidedness of the gaseous disk of spiral galaxies is a common phenomenon in disk morphology, profile and kinematics. Simultaneously, the asymmetry of a galaxy's stellar disk, in…
Quantified HI Morphology I: Multi-Wavelengths Analysis of the THINGS Galaxies
B. W. Holwerda, N. Pirzkal, W. J. G. de Blok +4
Galaxy evolution is driven to a large extent by interactions and mergers with other galaxies and the gas in galaxies is extremely sensitive to the interactions. One method to measu…
A Constant Molecular Gas Depletion Time in Nearby Disk Galaxies
F. Bigiel, A. K. Leroy, F. Walter +8
We combine new sensitive, wide-field CO data from the HERACLES survey with ultraviolet and infrared data from GALEX and Spitzer to compare the surface densities of H2, Sigma_H2, an…