{"title":"Spin parity of spiral galaxies. IV. Differential reddening of globular cluster systems of nearby spiral galaxies","authors":"Masanori Iye, Masafumi Yagi","doi":"10.1093/pasj/psae064","DOIUrl":null,"url":null,"abstract":"The north-west side of the disk of M 31 is known as the near side because of the differential reddening of globular clusters found from their photographic photometry. This paper reports a simple geometric model to evaluate the visibility of the effect and its application to published CCD photometry on globular cluster systems of three spiral galaxies, M 31, M 33, and NGC 253. The color difference of globular cluster systems due to differential reddening was confirmed for M 31 and NGC 253; however, the data for M 33 were insufficient. The analysis reaffirms the currently adopted interpretation that the side on the minor axis of the galactic disk, where more conspicuous dust features and interstellar reddening are visible, is the nearer side to us and provides an additional basis for using spiral galaxies with identified spiral windings, S-wise or Z-wise, to study the large-scale spin distribution of galaxies in the universe.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":null,"pages":null},"PeriodicalIF":2.2000,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Publications of the Astronomical Society of Japan","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1093/pasj/psae064","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
The north-west side of the disk of M 31 is known as the near side because of the differential reddening of globular clusters found from their photographic photometry. This paper reports a simple geometric model to evaluate the visibility of the effect and its application to published CCD photometry on globular cluster systems of three spiral galaxies, M 31, M 33, and NGC 253. The color difference of globular cluster systems due to differential reddening was confirmed for M 31 and NGC 253; however, the data for M 33 were insufficient. The analysis reaffirms the currently adopted interpretation that the side on the minor axis of the galactic disk, where more conspicuous dust features and interstellar reddening are visible, is the nearer side to us and provides an additional basis for using spiral galaxies with identified spiral windings, S-wise or Z-wise, to study the large-scale spin distribution of galaxies in the universe.
M 31圆盘的西北侧被称为近侧，因为从其摄影测光中发现了球状星团的不同变红现象。本文报告了一个简单的几何模型，用于评估该效应的可见度，并将其应用于已发表的关于三个螺旋星系（M 31、M 33 和 NGC 253）球状星团系统的 CCD 摄影测量。在 M 31 和 NGC 253 中，球状星团系统的色差是由不同的变红引起的，这一点得到了证实；但是 M 33 的数据不够充分。分析结果再次证实了目前所采用的解释，即星系盘小轴线上的一侧是离我们较近的一侧，在这一侧可以看到更明显的尘埃特征和星际变红现象，并为利用具有已识别螺旋缠绕（S 向或 Z 向）的螺旋星系来研究宇宙中星系的大尺度自旋分布提供了新的依据。
期刊介绍：
Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.
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