Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...661l.135m&link_type=abstract
The Astrophysical Journal, Volume 661, Issue 2, pp. L135-L138.
Astronomy and Astrophysics
Astronomy
3
Galaxies: Abundances, Galaxies: Individual: Ngc Number: Ngc 253, Galaxies: Ism, Galaxies: Starburst, Stars: Formation
Scientific paper
The H2S 22, 0-21, 1 and SO 55-44 transitions were observed simultaneously toward the starburst galaxy NGC 253 using the Submillimeter Array. Two H2S emission peaks are found at positions ~2" northeast (30 pc) and ~5" southwest (80 pc) from the galactic center, associated with the circumnuclear disk and coinciding with the inner ring structure seen on the SiO map by García-Burillo and coworkers. SO emission is detected, weakly, only toward the northeast. By combining data in the literature, we estimate H2S rotational temperatures of 130 K toward the northeast H2S peak and 46 K toward the southwest peak and derive H2S column densities of ~3 and ~1×1015 cm-2 and SO column densities of ~4 and <=3×1014 cm-2 toward the northeast and southwest peaks, respectively. The fractional abundances, relative to molecular hydrogen, are f~(1-3)×10-8 and 4×10-9 for H2S and SO, comparable with the values observed in Galactic massive star forming cores. The H2S emission is supposed to trace the ongoing star formation through hot core activity, and a rough comparison with the massive star forming region Orion KL indicates that several thousands of Orion KL-like cores may exist toward each of the H2S peaks.
Chol Minh Young
Liu Shen-Ye
Müller Samuel
Seog Yoon Tae
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