PACS and SPIRE photometer maps of M33: First results of the Herschel M33 extended survey (HERM33ES)
PACS and SPIRE photometer maps of M33: First results of the Herschel M33 extended survey (HERM33ES)
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M33 的 PACS 和 SPIRE 光度计图:Herschel M33 扩展勘测 (HERM33ES) 的第一个结果
DOI:
10.1051/0004-6361/201014613
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发表时间:
2010
影响因子:
6.5
通讯作者:
Kramer
中科院分区:
文献类型:
--
作者:
Kramer
ContextWithin the framework of the HERM33ES key program, we are studying the star forming interstellar medium in the nearby, metal-poor spiral galaxy M 33, exploiting the high resolution and sensitivity ofHerschel.AimsWe use PACS and SPIRE maps at 100, 160, 250, 350, and 500μm wavelength, to study the variation of the spectral energy distributions (SEDs) with galacto-centric distance.MethodsDetailed SED modeling is performed using azimuthally averaged fluxes in elliptical rings of 2 kpc width, out to 8 kpc galacto-centric distance. Simple isothermal and two-component grey body models, with fixed dust emissivity index, are fitted to the SEDs between 24μm and 500μm using also MIPS/Spitzerdata, to derive first estimates of the dust physical conditions.ResultsThe far-infrared and submillimeter maps reveal the branched, knotted spiral structure of M 33. An underlying diffuse disk is seen in all SPIRE maps (250–500μm). Two component fits to the SEDs agree better than isothermal models with the observed, total and radially averaged flux densities. The two component model, withβfixed at 1.5, best fits the global and the radial SEDs. The cold dust component clearly dominates; the relative mass of the warm component is less than 0.3% for all the fits. The temperature of the warm component is not well constrained and is found to be about 60 K±10 K. The temperature of the cold component drops significantly from ~24 K in the inner 2 kpc radius to 13 K beyond 6 kpc radial distance, for the best fitting model. The gas-to-dust ratio forβ= 1.5, averaged over the galaxy, is higher than the solar value by a factor of 1.5 and is roughly in agreement with the subsolar metallicity of M 33.
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影响因子:
6.5
作者:
A. Misiriotis;E. Xilouris;J. Papamastorakis;P. Boumis;C. Goudis
通讯作者:
A. Misiriotis;E. Xilouris;J. Papamastorakis;P. Boumis;C. Goudis
影响因子:
6.5
作者:
C. Kramer;J. Richer;B. Mookerjea;J. Alves;C. Lada
通讯作者:
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DOI:
10.1086/168997
发表时间:
1990
期刊:
The Astrophysical Journal
影响因子:
--
作者:
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通讯作者:
W. Freedman
DOI:
--
发表时间:
2010
期刊:
Astronomical Journal 139
影响因子:
--
作者:
Liu;G.;Kohno;K.;Ezawa;H.;et. al.
通讯作者:
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影响因子:
6.5
作者:
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通讯作者:
S. Verley