Maximum Entropy Image Restoration by Evolutionary Algorithm

Promislov, V. G.

doi:10.1007/978-1-4471-0819-1_31

Cited by 2 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We used the variant of the method, described by Wilchek and Drapatz (1985), except the computational algorithm to solve the optimization problem. The evolutionary algorithm, employed here, is described by Promislov (1999). The latter algorithm is more expensive computationally than that from Wilchek and Drapatz (1985), but in the case of a poor signal-to-noise ratio or insufficient grid spacing this algorithm may converge even if the algorithm from Wilchek and Drapatz (1985) fails.…”

Section: The Technique Of Mappingmentioning

confidence: 99%

Parameters of warm molecular clouds from methyl acetylene observations

et al. 2002

View full text Add to dashboard Cite

Abstract. The results of a survey of 63 galactic star-forming regions in the 6K − 5K and 5K − 4K methyl acetylene lines at 102 and 85 GHz, respectively, are presented. Fourty-three sources were detected at 102 GHz, and twentyfive at 85 GHz. Emission was detected towards molecular clouds with kinetic temperatures 20-60 K (so-called "warm clouds"). The CH3CCH abundances in these clouds appeared to be about several units × 10 −9 . Five mapped sources were analyzed using the maximum entropy method. The sizes of the mapped clouds fall within the range between 0.1 and 1.7 pc, virial masses -between 90 -6200 M , and densities -between 6 × 10 4 and 6 × 10 5 cm −3 . The CH3CCH sources spatially coincide with the CO and CS sources. Chemical evolution simulations showed that the typical methyl acetylene abundance in the observed clouds corresponds to an age of ≈ 6 × 10 4 years.

show abstract

Section: The Technique Of Mappingmentioning

confidence: 99%

Parameters of warm molecular clouds from methyl acetylene observations

et al. 2002

View full text Add to dashboard Cite

show abstract

“…The method used is similar to that described by Wilczek & Drapatz (1985) except the computational algorithm to solve the optimization problem. The evolutionary algorithm, used here, is described in Promislov (1999). We estimated the effective HPBW of the reconstruction in a manner, similar to that used by Moriarty-Schieven et al (1987).…”

Section: Observationsmentioning

confidence: 99%

Determination of molecular gas properties using methyl cyanide lines

et al. 2000

View full text Add to dashboard Cite

A survey of 27 galactic star-forming regions in the 6 K −5 K , 5 K − 4 K , and 8 K − 7 K CH 3 CN lines at 110, 92, and 147 GHz, respectively, was made. Twenty-five sources were detected at 110 GHz, nineteen at 92 GHz, and three at 147 GHz. The strongest CH 3 CN emission arise in hot cores in the regions of massive star formation. CH 3 CN abundance in these objects is larger than 10 −9 due to grain mantle evaporation. Weaker CH 3 CN lines were found in a number of sources. They may arise either in warm (30-50 K) dense (10 5 -10 7 cm −3 ) clouds, or in hot regions accompanied by colder gas.

show abstract

Maximum Entropy Image Restoration by Evolutionary Algorithm

Cited by 2 publications

References 4 publications

Parameters of warm molecular clouds from methyl acetylene observations

Parameters of warm molecular clouds from methyl acetylene observations

Determination of molecular gas properties using methyl cyanide lines

Contact Info

Product

Resources

About