---++ Rosie Chen's Current Research

---+++ *Seemingly Quiescent GMC N159-S -- is it forming massive stars or not?* %BR%
   * No massive stars/YSOs are found in the GMC N159-S, opposing to its northern neighbors GMCs N159-E+W. 
   * Is N159-S just beginning to form massive stars or not capable to do it?

    <img src="%ATTACHURLPATH%/n159_md1m.jpg" alt="YSOs in N159"  width="400"  />

---+++ *Searching for earliest star formation in N159-S* %BR%
   * Are there massive stars just being formed but not yet detectable with Spitzer?
   * Massive YSOs at earliest evolutionary stages are associated with dense gas clumps -- are there such clumps in N159-S?
   * (preliminary) ATCA HCO+ map of N159-S

    <img src="%ATTACHURLPATH%/m1_2hco.jpg" alt="HCO+ map"  width="800"  />
   * Obvious HCO+ detection along a dust filament in 24 um image, but not in the molecular core.
   * HCO+ clump in N159-S has brightness similar to the fainter clumps in N159-E+W.  The bright clumps in N159-E+W are all associated with massive YSOs, while there are no bright clumps nor massive YSOs in N159-S.

   * Any very embedded YSOs in the molecular core of GMC N159-S?
   * Herschel PACS 160 um image of N159-S (still no obvious sign of massive YSOs...)


    <img src="%ATTACHURLPATH%/n159_pacs160.jpg" alt="160 map"  width="400"  />


-- Main.RosieChen - 18 Jun 2010