A candidate protostellar object in the L1457 - MBM12 cloud - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado




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Abstract: The association of young T Tauri stars, MBM12A, indicates that L1457 wasforming stars not too long ago. With our study we want to find out whether ornot there are still signs for ongoing star formation in that cloud. Using theMax-Planck-Millimeter-Bolometer MAMBO at the IRAM 30m telescope we obtained amap of about 8- by 8- centered on L1457 in the dust continuum emission at 230GHz. Towards the most intense regions in our bolometer map we obtained spectraat high angular resolution in the CS 2-1 and the N2H+1-0 lines using theIRAM 30m telescope. We find that the cold dust in L1457 is concentrated inseveral small cores with high H2 column densities and solar masses. The densityprofiles of the cores are inconsistent with a sphere with constant density.These cores are closer to virial equilibrium than the cloud as a whole. Datafrom the VLA and Spitzer archives reveal two point sources in the direction ofone dust core. One of the sources is probably a distant quasar, whereas theother source is projected right on a local maximum of our dust map and showscharacteristics of a protostellar object.



Autor: Andreas Heithausen, Christoph Böttner

Fuente: https://arxiv.org/







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