| Type |
Journal Article |
| Names |
M. Meixner, F. Galliano, S. Hony, J. Roman-Duval, T. Robitaille, P. Panuzzo, M. Sauvage, K. Gordon, C. Engelbracht, K. Misselt, K. Okumura, T. Beck, J.-P. Bernard, A. Bolatto, C. Bot, M. Boyer, S. Bracker, L. R. Carlson, G. C. Clayton, C.-H. R. Chen, |
| Publication |
Astronomy and Astrophysics Letters |
| Volume |
518 |
| Pages |
L71 |
| Date |
July 1, 2010 |
| Short Title |
HERschel Inventory of The Agents of Galaxy Evolution (HERITAGE) |
| URL |
http://adsabs.harvard.edu/abs/2010A%26A...518L..71M |
| Library Catalog |
NASA ADS |
| Abstract |
The HERschel Inventory of The Agents of Galaxy Evolution (HERITAGE) of
the Magellanic Clouds will use dust emission to investigate the life
cycle of matter in both the Large and Small Magellanic Clouds (LMC and
SMC). Using the Herschel Space Observatory's PACS and SPIRE photometry
cameras, we imaged a 2° × 8° strip through the LMC, at a
position angle of ~22.5° as part of the science demonstration phase
of the Herschel mission. We present the data in all 5 Herschel bands:
PACS 100 and 160 μm and SPIRE 250, 350 and 500 μm. We present two
dust models that both adequately fit the spectral energy distribution
for the entire strip and both reveal that the SPIRE 500 μm emission
is in excess of the models by ~6 to 17%. The SPIRE emission follows the
distribution of the dust mass, which is derived from the model. The
PAH-to-dust mass (fPAH) image of the strip reveals a possible
enhancement in the LMC bar in agreement with previous work. We compare
the gas mass distribution derived from the HI 21 cm and CO J = 1-0 line
emission maps to the dust mass map from the models and derive
gas-to-dust mass ratios (GDRs). The dust model, which uses the standard
graphite and silicate optical properties for Galactic dust, has a very
low GDR = 65-18+15 making it an unrealistic dust
model for the LMC. Our second dust model, which uses amorphous carbon
instead of graphite, has a flatter emissivity index in the submillimeter
and results in a GDR = 287-42+25 that is more
consistent with a GDR inferred from extinction.
Herschel is an ESA space observatory with science instruments provided
by European-led Principal Investigator consortia and with important
participation from NASA. |
| Tags |
DUST, MAGELLANIC CLOUDS, extinction, submillimeter: ISM, submillimeter: galaxies |