Journal ArticleDOI
Mid-Infrared Properties of Low-Metallicity Blue Compact Dwarf Galaxies from the Spitzer Infrared Spectrograph
Yanling Wu,Vassilis Charmandaris,Vassilis Charmandaris,Lei Hao,Bernhard R. Brandl,Jeronimo Bernard-Salas,H. W. W. Spoon,J. R. Houck +7 more
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TLDR
In this article, a Spitzer-based mid-infrared (MIR) study of a large sample of blue compact dwarfs (BCDs) using the InfraredSpectrograph (IRS), including the firstMIRspectrumof IZw18,thearchetypefortheBCDclass and among the most metal-poor galaxies known.Abstract:
We present a Spitzer-based mid-infrared (MIR) study of a large sample of blue compact dwarfs (BCDs) using the InfraredSpectrograph(IRS),includingthefirstMIRspectrumof IZw18,thearchetypefortheBCDclassandamong the most metal-poor galaxies known. We show the spectra of polycyclic aromatic hydrocarbon (PAH) emission in a low-metallicity environment. We find that the equivalent widths (EWs) of PAHs at 6.2, 7.7, 8.6, and 11.2 � ma re generally weaker in BCDs than in typical starburst galaxies and that the fine-structure line ratio, [Ne iii]/[Ne ii], has a weak anticorrelation with the PAH EW. A much stronger anticorrelation is shown between the PAH EW and the product of the [Ne iii]/[Ne ii] ratio and the UV luminosity density divided by the metallicity. We conclude that the PAH EWin metal-poor high-excitation environments is determined by a combination of PAH formation and destruction effects. Subject headings: dust, extinction — galaxies: abundances — galaxies: dwarf — galaxies: starburst — infrared: galaxiesread more
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Journal ArticleDOI
Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
Bruce T. Draine,Aigen Li +1 more
TL;DR: In this paper, the authors calculated IR emission spectra for dust heated by starlight, for mixtures of amorphous silicate and graphitic grains, including varying amounts of PAH particles.
Journal ArticleDOI
Interstellar Polycyclic Aromatic Hydrocarbon Molecules
TL;DR: In this paper, a review of the observed mid-IR spectral properties of polycyclic aromatic hydrocarbons (PAHs) is presented, emphasizing the contribution of these species to photoelectric heating and the ionization balance of the interstellar gas and to the formation of small hydrocarbon radicals and carbon chains.
Journal ArticleDOI
Dust Masses, PAH Abundances, and Starlight Intensities in the SINGS Galaxy Sample
Bruce T. Draine,Daniel A. Dale,George J. Bendo,Karl D. Gordon,J. D. T. Smith,Lee Armus,Charles W. Engelbracht,George Helou,Robert C. Kennicutt,Robert C. Kennicutt,Aigen Li,Helene Roussel,Fabian Walter,Daniela Calzetti,John Moustakas,John Moustakas,Eric J. Murphy,George H. Rieke,Caroline Bot,David Hollenbach,Kartik Sheth,Harry I. Teplitz +21 more
TL;DR: Physical dust models for 65 galaxies in SINGS that are strongly detected in the four IRAC bands and three MIPS bands were presented for each galaxy as discussed by the authors, estimating the total dust mass, the fraction of the dust mass contributed by PAHs, and the intensity of the starlight heating the dust grains.
Journal ArticleDOI
The Calibration of Mid-Infrared Star Formation Rate Indicators
Daniela Calzetti,Daniela Calzetti,Robert C. Kennicutt,C. W. Engelbracht,Claus Leitherer,Bruce T. Draine,Lisa J. Kewley,John Moustakas,M. Sosey,Daniel A. Dale,Karl D. Gordon,George Helou,David Hollenbach,Lee Armus,George J. Bendo,Caroline Bot,Brent A. Buckalew,Thomas H. Jarrett,Aigen Li,Martin Meyer,Eric J. Murphy,Moire K. M. Prescott,Michael W. Regan,George H. Rieke,Helene Roussel,Kartik Sheth,J. D. T. Smith,Michele D. Thornley,Fabian Walter +28 more
TL;DR: In this paper, the authors analyzed Spitzer 8 and 24 μm data of star-forming regions in a sample of 33 nearby galaxies with available HST NICMOS images in the Paα (1.8756 μm) emission line.
Journal ArticleDOI
The mid-infrared spectrum of star-forming galaxies: Global properties of polycyclic aromatic hydrocarbon emission
Jd Smith,Bruce T. Draine,Daniel A. Dale,John Moustakas,Robert C. Kennicutt,Robert C. Kennicutt,George Helou,Lee Armus,Helene Roussel,Kartik Sheth,George J. Bendo,Brent A. Buckalew,Daniela Calzetti,Charles W. Engelbracht,Karl D. Gordon,David Hollenbach,Aigen Li,Sangeeta Malhotra,Eric J. Murphy,Fabian Walter +19 more
TL;DR: In this article, a sample of low-resolution 5-38 μm Spitzer IRS spectra of the inner few square kiloparsecs of 59 nearby galaxies spanning a large range of star formation properties was used to explore the behavior of PAH emission and the prevalence of silicate dust extinction.
References
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Journal ArticleDOI
The Spitzer Space Telescope mission
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TL;DR: In this article, the authors survey the observed properties of interstellar dust grains: the wavelength-dependent extinction of starlight, including absorption features, from UV to infrared; optical luminescence; and optical luminance.
Journal ArticleDOI
The infrared spectrograph (irs) on the spitzer space telescope
J. R. Houck,T. L. Roellig,J. van Cleve,William J. Forrest,Terry Herter,Charles R. Lawrence,Keith Matthews,Harold J. Reitsema,B. T. Soifer,Dan M. Watson,Daniel W. Weedman,Marty Huisjen,J. Troeltzsch,Donald J. Barry,Jeronimo Bernard-Salas,C. Blacken,Bernhard R. Brandl,Vassilis Charmandaris,Daniel Devost,George E. Gull,Peter Hall,Chuck Henderson,Sarah J.U. Higdon,Bruce Pirger,Justin Schoenwald,Gregory C. Sloan,K. I. Uchida,P. N. Appleton,Lee Armus,Martin Burgdorf,Sergio Fajardo-Acosta,Carl J. Grillmair,J. Ingalls,Patrick W. Morris,Harry I. Teplitz +34 more
TL;DR: The Infrared Spectrograph (IRS) as discussed by the authors is one of the three science instruments on the Spitzer Space Telescope and is optimized to take full advantage of the very low background in the space environment.
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The Infrared Spectrograph on the Spitzer Space Telescope
TL;DR: The Infrared Spectrograph (IRS) is one of the three science instruments on the Spitzer Space Telescope as mentioned in this paper, which is optimized to take full advantage of the very low background in the space environment.
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