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The luminous, the massive and the dusty: a near- to mid-infrared spectroscopic study of submillimeter galaxies

Citation

Menendez-Delmestre, Karin (2009) The luminous, the massive and the dusty: a near- to mid-infrared spectroscopic study of submillimeter galaxies. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-09102008-170617

Abstract

Submillimeter (submm) surveys have uncovered a population of dust-enshrouded ultra-luminous galaxies that are inconspicuous in deep surveys at shorter wavelengths. Inferred to have high star-formation rates (up to more than 1000 Msun/yr), submm-selected galaxies (SMGs) contribute significantly to the global star-formation rate density at z~2-3 and are thus critical players in building up stars in galaxies. Many SMGs have been shown to display X-ray, optical and near-infrared (IR) signatures of active galactic nuclei (AGN), prompting the question: how significant is the AGN contribution to their total luminosity? Central to understanding SMGs is the study of the nature of their power source, their internal dynamics, their SFRs and their masses. We study mid-IR and near-IR spectra of SMGs to investigate these aspects.

We have obtained the largest sample of 24 SMGs to date with the mid-IR Spitzer Infrared Spectrograph (IRS) at z ~ 0.65 - 3.2. Broad PAH emission features -- typically associated to intense star-formation -- are almost ubiquitous in the sample and the composite spectrum is well fit by a combination of a starburst component with an additional power law representing less than a 35% AGN contribution to the bolometric luminosity. We find weak silicate absorption in contrast to local ultra-luminous IR galaxies (ULIRGs), suggesting that the mid-IR visible star formation in SMGs occurs in a more extended component.

We also study the near-IR emission of SMGs with the OH-Suppressing Infrared Imaging Spectrograph (OSIRIS), together with the Keck Laser-Guide Star Adaptive Optics system, to investigate the distribution and dynamics of the ionized gas. The two-dimensional insight of these observations allow us to distinguish and quantify the compact AGN emission, which allows us to refine estimates of dynamical masses, SFRs and gas masses for the population. With a spatially-resolved spectroscopic insight into the kpc-scale structure of these galaxies, we find that the H-alpha emission in SMGs extends over scales ~4-17 kpc, setting SMGs apart from local ULIRGs, where intense emission is confined to the central 1 kpc.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:high-redshift galaxies; Keck NIRSPEC; Keck OSIRIS; Spitzer IRS; submillimeter galaxies
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Astronomy
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Blain, Andrew W.
Thesis Committee:
  • Scoville, Nicholas Zabriskie (chair)
  • Benson, Andrew J.
  • Blain, Andrew W.
  • Cohen, Judith G.
  • Armus, Lee
Defense Date:26 August 2008
Record Number:CaltechETD:etd-09102008-170617
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-09102008-170617
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3448
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:21 Oct 2008
Last Modified:26 Dec 2012 03:00

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