A Caltech Library Service

Observations of ULIRGs with the IRS on Spitzer

Armus, L. (2009) Observations of ULIRGs with the IRS on Spitzer. In: AKARI, a light to illuminate the misty universe. ASP Conference Series. No.418. Astronomical Society of the Pacific , San Francisco, CA, pp. 207-216. ISBN 978-1-58381-716-2.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


Ultraluminous Infrared Galaxies (ULIRGs), those systems with L_(IR) ≥ 10^(12)L_⊙, have the power output of quasars, yet (re-)emit the vast majority of their energy in the far-infrared part of the spectrum. Because this energy is reprocessed by dust, the origin of the power is often hidden from view. With the Infrared Spectrograph on the Spitzer Space Telescope, we have observed a large number of low-redshift ULIRGs in order to better understand the source of their power, the conditions in the dusty interstellar medium, and their relationship to optically selected quasi-stellar objects (QSOs), effectively increasing the number of ULIRGs with rest-frame mid-infrared spectra by two orders of magnitude. The IRS has also been used to obtain the first mid-infrared spectra of samples of ULIRGs at redshifts of z > 2. In this paper, we summarize the key findings from the IRS studies of ULIRGs at low and high redshifts, and look toward the future of far-infrared spectroscopy from space.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Armus, L.0000-0003-3498-2973
Additional Information:© 2009 Astronomical Society of the Pacific. We wish to thank the conference organizers for a stimulating meeting, and an enjoyable visit to Tokyo. We look forward to many more exciting results from the AKARI mission.
Series Name:ASP Conference Series
Issue or Number:418
Record Number:CaltechAUTHORS:20100913-155107694
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19920
Deposited By: Tony Diaz
Deposited On:16 Sep 2010 22:56
Last Modified:24 Feb 2020 10:30

Repository Staff Only: item control page