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The earliest phases of high-mass star formation, as seen in NGC 6334 by <i>Herschel</i>-HOBYS
Tigé,, J.,Motte, F.,Russeil, D.,Zavagno, A.,Hennemann, M.,Schneider, N.,Hill, T.,Nguyen Luong, Q.,Di Francesco, J.,Bontemps, S.,Louvet, F.,Didelon, P.,Kö,nyves, V.,André,, Ph.,Leuleu, Springer-Verlag 2017 Astronomy and astrophysics Vol.602 No.-
Far-infrared observations of a massive cluster forming in the Monoceros R2 filament hub
Rayner, T. S. M.,Griffin, M. J.,Schneider, N.,Motte, F.,Kö,nyves, V.,André,, P.,Di Francesco, J.,Didelon, P.,Pattle, K.,Ward-Thompson, D.,Anderson, L. D.,Benedettini, M.,Bernard, J.-P.,Bonte Springer-Verlag 2017 Astronomy and astrophysics Vol.607 No.-
Young Stellar Objects in the Massive Star-forming Regions W51 and W43
Saral, G.,Hora, J. L.,Audard, M.,Koenig, X. P.,Martí,nez-Galarza, J. R.,Motte, F.,Nguyen-Luong, Q.,Saygac, A. T.,Smith, H. A. American Astronomical Society 2017 The Astrophysical journal Vol.839 No.2
<P>We present the results of our investigation of the star-forming complexes W51 and W43, two of the brightest in the first Galactic quadrant. In order to determine the young stellar object (YSO) populations in W51 and W43 we used color-magnitude relations based on Spitzer mid-infrared and 2MASS/UKIDSS near-infrared data. We identified 302 Class I YSOs and 1178 Class II/transition disk candidates in W51, and 917 Class I YSOs and 5187 Class II/transition disk candidates in W43. We also identified tens of groups of YSOs in both regions using the Minimal Spanning Tree (MST) method. We found similar cluster densities in both regions, even though Spitzer was not able to probe the densest part of W43. By using the Class II/I ratios, we traced the relative ages within the regions and, based on the morphology of the clusters, we argue that several sites of star formation are independent of one another in terms of their ages and physical conditions. We used spectral energy distribution-fitting to identify the massive YSO (MYSO) candidates since they play a vital role in the star formation process, and then examined them to see if they are related to any massive star formation tracers such as UCH II regions, masers, or dense fragments. We identified 17 MYSO candidates in W51, and 14 in W43, respectively, and found that groups of YSOs hosting MYSO candidates are positionally associated with H II regions in W51, though we do not see any MYSO candidates associated with previously identified massive dense fragments in W43.</P>
N. Chevalier,F. Chandezon,J. Bleuse,J.C. Woehl,J.F. Motte,M. Stark,M.J. Nasse,P. Reiss,S. Huant 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
We present a method to realize active optical tips for use in near-field optics that can operate at room temperature. A metal-coated optical tip is covered with a thin polymer layer stained with CdSe nanocrystals at low density. The time analysis of the emission rate of the active tip and the analysis of its emission spectra reveal that a very small number of particles - possibly down to only one nanocrystal - can be made active at the tip apex. This opens the way to optics with a single nanocrystal as a light source.