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2 Acta Astronomica

2 2003

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Extinction in the Galaxy from Surface Brightnesses of ESO-LV Galaxies: Testing ''Standard'' Extinction Maps

Chołoniewski J., Valentijn E. A.

Acta Astronomica

2003

Vol. 56, No. 3

265--280

The relative extinction in the Galaxy computed with new method by Chołoniewski and Valentijn is compared with three patterns: Schlegel, Finkbeiner and Davis, Burstein and Heiles and the cosecans law. It is shown that extinction of SFD is more reliable than that of BH since it stronger correlates with our new extinction. The smallest correlation coefficient was obtained for the cosecans law. Linear regression analysis show that SFD overestimate the extinction by a factor of 1.4. Our results clearly indicate that there is non-zero extinction at the Galactic South pole and that the extinction near the Galactic equator (|b|<40°) is significantly larger in the Southern than in the Northern hemisphere.

Extinction in the Galaxy from Surface Brightnesses of ESO-LV Galaxies: Determination of AR/AB ratio

Chołoniewski J., Valentijn E. A.

Acta Astronomica

2003

Vol. 56, No. 3

249--264

A new method for the determination of the extinction in the Galaxy is proposed. The method uses surface brightnesses of external galaxies in the B and R-bands. The observational data have been taken from the ESO-LV galaxy catalog. As a first application of our model we derive the ratio of R-band to B-band extinction. We introduce two methods for computing the ratio which give: 0.62±0.05 (the first method) and 0.64±0.06 (the second method) which is in agreement with the recent literature value of 0.61. This agreement confirms the validity and efficiency of our model and is an independent verification for the standard value of the "total to selective extinction". The method of extinction determination introduced in this paper will be explored in subsequent publication.