Astronomy and Astrophysics, volume 563A, 125-125 (2014/3-1)
Multiwavelength study of the high-latitude cloud L1642: chain of star formation.
MALINEN J., JUVELA M., ZAHORECZ S., RIVERA-INGRAHAM A., MONTILLAUD J., ARIMATSU K., BERNARD J.-P., DOI Y., HAIKALA L.K., KAWABE R., MARTON G., McGEHEE P., PELKONEN V.-M., RISTORCELLI I., SHIMAJIRI Y., TAKITA S., TOTH L.V., TSUKAGOSHI T. and YSARD N.
Abstract (from CDS):
L1642 is one of the two high galactic latitude (|b|>30°) clouds confirmed to have active star formation. We examine the properties of this cloud, especially the large-scale structure, dust properties, and compact sources at different stages of star formation. We present high-resolution far-infrared and submillimetre observations with the Herschel and AKARI satellites and millimetre observations with the AzTEC/ASTE telescope, which we combined with archive data from near- and mid-infrared (2MASS, WISE) to millimetre wavelength observations (Planck). The Herschel observations, combined with other data, show a sequence of objects from a cold clump to young stellar objects (YSOs) at different evolutionary stages. Source B-3 (2MASS J04351455-1414468) appears to be a YSO forming inside the L1642 cloud, instead of a foreground brown dwarf, as previously classified. Herschel data reveal striation in the diffuse dust emission around the cloud L1642. The western region shows striation towards the NE and has a steeper column density gradient on its southern side. The densest central region has a bow-shock like structure showing compression from the west and has a filamentary tail extending towards the east. The differences suggest that these may be spatially distinct structures, aligned only in projection. We derive values of the dust emission cross-section per H nucleon of σe(250 µm)=0.5-1.5x10–25cm2/H for different regions of the cloud. Modified black-body fits to the spectral energy distribution of Herschel and Planck data give emissivity spectral index β values 1.8-2.0 for the different regions. The compact sources have lower β values and show an anticorrelation between T and β. Markov chain Monte Carlo calculations demonstrate the strong anticorrelation between β and T errors and the importance of millimetre wavelength Planck data in constraining the estimates. L1642 reveals a more complex structure and sequence of star formation than previously known.
ISM: structure - ISM: clouds - stars: formation - submillimeter: ISM - ISM: individual objects: L1642
VizieR on-line data:
<Available at CDS (J/A+A/563/A125): list.dat maps/*>
Fig. 2: [MJZ2014] A-N (Nos B-1 to B-4, E, G, N).
Fig.6, Table 3 sources B-1 to B-4 not in SIMBAD.
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