Publications (13)
Keck spectroscopy and Spitzer Space Telescope analysis of the outer disk of the Triangulum Spiral Galaxy M33
David L. Block, Francoise Combes, Ivanio Puerari +11
In an earlier study of the spiral galaxy M33, we photometrically identified arcs or outer spiral arms of intermediate age (0.6 Gyr - 2 Gyr) carbon stars precisely at the commenceme…
The Large Magellanic Cloud: A power spectral analysis of Spitzer images
Ivanio Puerari, David L. Block, Bruce G. Elmegreen +1
We present a power spectral analysis of Spitzer images of the Large Magellanic Cloud. The power spectra of the FIR emission show two different power laws. At larger scales (kpc) th…
Gravitational torques in spiral galaxies: gas accretion as a driving mechanism of galactic evolution
David L. Block, Frederic Bournaud, Francoise Combes +2
The distribution of gravitational torques and bar strengths in the local Universe is derived from a detailed study of 163 galaxies observed in the near-infrared. The results are co…
The detection of spiral arm modulation in the mass distribution of an optically flocculent galaxy
Ivanio Puerari, David L. Block, Bruce G. Elmegreen +2
Spiral arm modulation in NGC 4062 (an optical flocculent) is detected for the first time; the Fourier spectra of NGC 4062 and NGC 5248 (a classic grand design in optical images) ar…
Dust penetrated arm classes: insight from rising and falling rotation curves
Marc S. Seigar, David L. Block, Ivanio Puerari
We present near-infrared K-band images of 15 galaxies. We have performed a Fourier analysis on the spiral structure of these galaxies in order to determine their pitch angles and d…
Variation of Galactic Bar Length with Amplitude and Density as Evidence for Bar Growth over a Hubble Time
Bruce G. Elmegreen, Debra Meloy Elmegreen, Johan H. Knapen +3
K_s-band images of 20 barred galaxies show an increase in the peak amplitude of the normalized m=2 Fourier component with the R_25-normalized radius at this peak. This implies that…