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Title:
Spitzer Space Telescope Infrared Imaging and Spectroscopy of the Crab Nebula [ Erratum: 2009AJ....137.5155T ]
Authors:
Temim, Tea; Gehrz, Robert D.; Woodward, Charles E.; Roellig, Thomas L.; Smith, Nathan; Rudnick, Lawrence; Polomski, Elisha F.; Davidson, Kris; Yuen, Lunming; Onaka, Takashi
Affiliation:
AA(Department of Astronomy, School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455; , , , , , .), AB(Department of Astronomy, School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455; , , , , , .), AC(Department of Astronomy, School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455; , , , , , .), AD(NASA Ames Research Center, MS 245-6, Moffett Field, CA 94035-1000 .), AE(Center for Astrophysics and Space Astronomy, University of Colorado, 389 UCB, Boulder, CO 80309; .; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.), AF(Department of Astronomy, School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455; , , , , , .), AG(Department of Astronomy, School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455; , , , , , .), AH(Department of Astronomy, School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455; , , , , , .), AI(Technosciences Corporation, MS 245-6, Moffett Field, CA 94035; .), AJ(University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; .)
Publication:
The Astronomical Journal, Volume 132, Issue 4, pp. 1610-1623. (AJ Homepage)
Publication Date:
10/2006
Origin:
UCP
AJ Keywords:
acceleration of particles, ISM: Cosmic Rays, ISM: Individual: Name: Crab Nebula, Stars: Pulsars: Individual: Name: Crab Nebula, radiation mechanisms: nonthermal, ISM: Supernova Remnants
DOI:
10.1086/507076
Bibliographic Code:
2006AJ....132.1610T

Abstract

We present 3.6, 4.5, 5.8, 8.0, 24, and 70 μm images of the Crab Nebula obtained with the Spitzer Space Telescope IRAC and MIPS cameras, low- and high-resolution Spitzer IRS spectra of selected positions within the nebula, and a near-infrared ground-based image made in the light of [Fe II] 1.644 μm. The 8.0 μm image, made with a bandpass that includes [Ar II] 7.0 μm, resembles the general morphology of visible Hα and near-IR [Fe II] line emission, while the 3.6 and 4.5 μm images are dominated by continuum synchrotron emission. The 24 and 70 μm images show enhanced emission that may be due to line emission or the presence of a small amount of warm dust in the nebula on the order of less than 1% of a solar mass. The ratio of the 3.6 and 4.5 μm images reveals a spatial variation in the synchrotron power-law index ranging from approximately 0.3 to 0.8 across the nebula. Combining this information with optical and X-ray synchrotron images, we derive a broadband spectrum that reflects the superposition of the flatter spectrum of the jet and torus with the steeper spectrum of the diffuse nebula. We also see suggestions of the expected pileup of relativistic electrons just before the exponential cutoff in the X-ray. The pulsar, and the associated equatorial toroid and polar jet structures seen in Chandra and Hubble Space Telescope images (Hester et al. 2002), can be identified in all of the IRAC images. We present the IR photometry of the pulsar. The forbidden lines identified in the high-resolution IR spectra are all double due to Doppler shifts from the front and back of the expanding nebula and give an expansion velocity of ~1264 km s-1.

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