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The thick disk in the galaxy NGC 4244 from S4G imaging
Sébastien Comerón, Johan H. Knapen, Kartik Sheth +16
If thick disks are ubiquitous and a natural product of disk galaxy formation and/or evolution processes, all undisturbed galaxies which have evolved during a significant fraction o…
A New Method for Measuring the Upper End of the IMF
Daniela Calzetti, Rupali Chandar, Janice C. Lee +3
A method is presented here for investigating variations in the upper end of the stellar Initial Mass Function (IMF) by probing the production rate of ionizing photons in unresolved…
The Spitzer Survey of Stellar Structure in Galaxies (S^4G)
Kartik Sheth, Michael Regan, Joannah L. Hinz +35
The Spitzer Survey of Stellar Structure in Galaxies S^4G is an Exploration Science Legacy Program approved for the Spitzer post-cryogenic mission. It is a volume-, magnitude-, and…
Tadpole Galaxies in the Hubble Ultra Deep Field
Bruce G. Elmegreen, Debra Meloy Elmegreen
Tadpole galaxies have a head-tail shape with a large clump of star formation at the head and a diffuse tail or streak of stars off to one side. We measured the head and tail masses…
Mass Functions in Fractal Clouds: The Role of Cloud Structure in the Stellar Initial Mass Function
Mohsen Shadmehri, Bruce G. Elmegreen
The possibility that the stellar initial mass function (IMF) arises mostly from cloud structure is investigated with fractal Brownian motion (fBm) clouds that have power-law power…
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…