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Date and Time of the Query: 2019-06-19 T03:27:58 PDT
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For refcode 1990A&A...233...16C:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1990A&A...233...16C Research Note The influence of absorption on galaxy diameters and magnitudes L. M. Cameron Astronomisches Institut der Universitat Basel, Venusstrasse 7, CH-4102 Binningen, Switzerland Received June 29, accepted September 28, 1989 Abstract. Galaxies lying very close to the galactic plane, i.e. with |b| < 10^deg^, face a reduction of their angular diameter due to front absorption. In the case of isophotal magnitudes there is, on top of the simple absorption correction, an additional dimming caused by the loss of the outer regions of the galaxy. A sample of spiral and elliptical galaxies with known surface photometry was artificially absorbed. The newly calculated intensity profiles, resulting from an ever increasing artificial absorption, where then compared with the original ones and relationships between the absorption and a diameter reduction factor as well as a magnitude correction factor were established. These relationships differ according to galaxian type. For absorptions larger than one magnitude this additional correction due to the diameter reduction is significant. At an absorption of 3.5 mag, an elliptical galaxy will be additionally dimmed by 0.8 mag, a spiral galaxy by as much as 1.6 mag. Thus, within their 25 mag arcsec^-2^ isophote, especially galaxies at latitudes of |b| < 10^deg^ are actually brighter than their - only absorption corrected - magnitudes would suggest. Key words: galaxies - cosmology - interstellar medium: extinction distances
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