Query : 2006A&A...450..193H

2006A&A...450..193H - Astronomy and Astrophysics, volume 450, 193-197 (2006/4-4)

An unbiased deep search for small-area molecular structures.


Abstract (from CDS):

Small-area molecular structures (SAMS) resembling clumpuscules proposed as candidates for baryonic dark matter, have been detected in an area where the shielding is too low for them to survive for a long time. I present the results of an unbiased deep search for molecular clumpuscules to study the frequency of occurence of such structures. The area surrounding these structures has been surveyed using the FCRAO 14m telescope in the CO (1-0) transition. The field covered is 20' by 20'. The resulting rms of the data is only 0.04K in a 0.127km/s wide channel. Additionally, high-angular resolution observations of the 13CO and C18O (J=1-0) transitions were obtained with the IRAM Plateau-de-Bure Interferometer. 3 new SAMS have been detected. The structures have very low intensities which makes it impossible to detect them in large scale CO surveys conducted to map the molecular gas of the Milky Way. Their radial velocity is similar to that of the surrounding HI gas. The clouds follow the same size-linewidth relation as found for giant molecular clouds or Galactic cirrus clouds. The observations clearly show that most of the large linewidths observed at low angular resolution are caused by a large velocity difference between the clumps seen at highest angular resolution. The non-detection of the structures in the high-angular resolution observations of the 13CO and C18O (J=1-0) transitions shows that the 12CO

Abstract Copyright:

Journal keyword(s): dark matter - ISM: abundances - ISM: clouds - ISM: molecules

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4288 3
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5703 6
3 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 744 0
4 NGC 3269 GiG 10 29 57.0426202656 -35 13 27.888395700   13.24 13.51 11.73   ~ 40 0

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