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Infrared Emission by Dust Around lambda Bootis Stars: Debris Disks or Thermally Emitting Nebulae?
J. R. Martínez-Galarza, I. Kamp, K. Y. L. Su +3
We present a model that describes stellar infrared excesses due to heating of the interstellar (IS) dust by a hot star passing through a diffuse IS cloud. This model is applied to…
The IR Luminosity Functions of Rich Clusters
Lei Bai, George H. Rieke, Marcia J. Rieke +2
We present MIPS observations of the cluster A3266. About 100 spectroscopic cluster members have been detected at 24 micron. The IR luminosity function in A3266 is very similar to t…
Spitzer Observations of L429: A Near-collapse or Collapsing Starless Core
Amelia M. Stutz, Tyler L. Bourke, George H. Rieke +4
We present Spitzer infrared observations of the starless core L429. The IR images of this core show an absorption feature, caused by the dense core material, at wavelengths <= 70 m…
Photoevaporation of Protoplanetary Disks
Z. Balog, G. H. Rieke, J. Muzerolle +4
We present HST/NICMOS Paschen alpha images and low and high resolution IRS spectra of photoevaporating disk-tail systems originally detected at 24 micron near O stars. We find no P…
BH Accretion in Low-Mass Galaxies Since z~1
Yong Shi, George Rieke, Jennifer Donley +3
We have selected a sample of X-ray emitting active galactic nuclei (AGNs) in low-mass host galaxies (5e9-2e10 Msun) out to z~1. By comparing to AGNs in more massive hosts, we have…
Spitzer 24 micron detections of starburst galaxies in Abell 851
A. Dressler, J. Rigby, A. Oemler +4
Spitzer-MIPS 24 micron and ground-based observations of the rich galaxy cluster Abell 851 at z=0.41 are used to derive star formation rates from the mid-IR 24 micron and from [O II…