Spitzer observations of the supergiant shell region in Ic 2574

John M Cannon; Fabian Walter; Eric J Murphy; Michele D Thornley; Lee Armus; David J Hollenbach; Claus Leitherer; Michael W Regan; Hélène Roussel; Kartik Sheth; George J Bendo; Daniela Calzetti; Daniel A Dale; Bruce T Draine; Charles W Engelbracht; Karl D Gordon; George Helou; Robert C Kennicutt

doi:10.1086/491671

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Spitzer observations of the supergiant shell region in Ic 2574

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Spitzer observations of the supergiant shell region in Ic 2574

John M Cannon, Fabian Walter, Eric J Murphy, Michele D Thornley, Lee Armus, David J Hollenbach, Claus Leitherer, Michael W Regan, Hélène Roussel, Kartik Sheth, …

The Astrophysical journal, Vol.630(1), pp.L37-L40

09/01/2005

DOI: 10.1086/491671

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Abstract

We present spatially resolved Spitzer Space Telescope imaging of the supergiant shell region of the M81 group dwarf galaxy IC 2574 obtained as part of the Spitzer Infrared Nearby Galaxies Survey. This region harbors one of the best nearby examples of a kinematically distinct H I shell, with an associated remnant stellar cluster; the shell is initiating sequential star formation as it interacts with the surrounding interstellar medium. This region dominates the infrared luminosity of IC 2574 and is spatially resolved in all Spitzer imaging bands. We study the differences in dust temperature as a function of local environment and compare local star formation rates as inferred from Hα and total infrared luminosities. We find that the strong Hα sources are associated with regions of warm dust; however, the most luminous infrared and Hα sources are not necessarily cospatial. The coolest dust is found in the regions farthest from the rim of the shell; these regions show the best agreement between star formation rates derived from Hα and from total infrared luminosities (although discrepancies at the factor of 3-4 level still exist). There is considerable variation in the radio-far-infrared correlation in different regions surrounding the shell. The low dust content of the region may influence the scatter seen in these relations; these data demonstrate that the expanding shell is dramatically affecting its surroundings by triggering star formation and altering the dust temperature.

Supergiant stars

galaxies: dwarf-galaxies: individual (IC 2574)-galaxies: irregular-galaxies: ISM- infrared: galaxies

Infrared galaxies

Dwarf galaxies

Irregular galaxies

Details

Title: Subtitle: Spitzer observations of the supergiant shell region in Ic 2574
Creators: John M Cannon - Max Planck Institute for Astronomy
Fabian Walter - Max Planck Institute for Astronomy
Eric J Murphy - Yale University
Michele D Thornley - Bucknell University
Lee Armus - California Institute of Technology
David J Hollenbach - Ames Research Center
Claus Leitherer - Space Telescope Science Institute
Michael W Regan - Space Telescope Science Institute
Hélène Roussel - California Institute of Technology
Kartik Sheth - California Institute of Technology
George J Bendo - University of Arizona
Daniela Calzetti - Space Telescope Science Institute
Daniel A Dale - University of Wyoming
Bruce T Draine - Princeton University
Charles W Engelbracht - University of Arizona
Karl D Gordon - University of Arizona
George Helou - California Institute of Technology
Robert C Kennicutt - University of Arizona
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.630(1), pp.L37-L40
Publisher: University of Chicago Press
DOI: 10.1086/491671
ISSN: 0004-637X
eISSN: 1538-4357
Language: English
Date published: 09/01/2005
Academic Unit: Physics and Astronomy
Record Identifier: 9984627318502771

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