Extending the limits of globule detection -- ISOPHOT Serendipity Survey Observations of interstellar clouds
L.V. Toth, Cs. Kiss, M. Juvela, M. Stickel, U. Liesenfeld, S. Hotzel

TL;DR
This paper reports the discovery and detailed analysis of a faint, cold bipolar globule using the ISOPHOT Serendipity Survey, revealing its physical properties and chemical composition, and highlighting a new class of small, low-brightness interstellar clouds.
Contribution
It extends the detection limits of globules by identifying a new class of small, faint interstellar clouds through multiwavelength observations and detailed chemical analysis.
Findings
Discovered a faint bipolar globule with specific temperature and size.
Determined the globule's density and chemical composition.
Identified an overabundance of 13CO likely due to isotope-selective processes.
Abstract
A faint MJysr bipolar globule was discovered with the ISOPHOT 170 m Serendipity Survey (ISOSS). ISOSS J 20246+6541 is a cold ( K) FIR source without an IRAS pointsource counterpart. In the Digitized Sky Survey B band it is seen as a 3\arcmin size bipolar nebulosity with an average excess surface brightness of mag/\arcsec . The CO column density distribution determined by multi-isotopic, multi-level CO measurements with the IRAM-30m telescope agrees well with the optical appearance. An average hydrogen column density of cm was derived from both the FIR and CO data. Using a kinematic distance estimate of 400 pc the NLTE modelling of the CO, HCO, and CS measurements gives a peak density of cm. The multiwavelength data characterise ISOSS 20246+6541 as a representative…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Atmospheric Ozone and Climate
