WEKO3
アイテム
Galaxy structures and external perturbations in gravitational lenses
https://ir.soken.ac.jp/records/3293
https://ir.soken.ac.jp/records/3293581ddf0e-2cdd-42b2-a80c-9261429010cb
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
56022559 (119.9 kB)
|
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2012-12-13 | |||||
| タイトル | ||||||
| タイトル | Galaxy structures and external perturbations in gravitational lenses | |||||
| タイトル | ||||||
| タイトル | Galaxy structures and external perturbations in gravitational lenses | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| 著者 |
KAWANO, Yozo
× KAWANO, Yozo× OGURI, Masamune× MATSUBARA, Takahiko× IKEUCHI, Satoru |
|||||
| 著者別名 |
池内, 了
× 池内, 了 |
|||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In modeling strong gravitational lens systems, one often adopts simple models, such as singular isothermal elliptical density plus lowest-order external perturbation. However, such simple models may mislead us if the real mass distribution is more complicated than that in the assumed models. In particular, assumptions on mass models are crucial in studying flux ratio anomalies that have been suggested as evidence for a cold dark-matter substructure. We reinvestigated four quadruple lens systems using power-law Fourier models, which have advantages of clear physical meanings and the applicability of a linear method, as well as a simple singular isothermal elliptical density model. We also investigated the effect of external perturbations, including a singular isothermal sphere, lowest-order expansion, and next-order expansion. We have found that the $\cos3\theta$ terms of the primary galaxy and/or of external perturbation significantly reduce the \chi^2 in PG 1115+080 and B1422+231. In particular, we could reproduce the flux ratios of B1422+231 with next-order external perturbation assuming 5% flux uncertainties, suggesting that external perturbation cannot be described by a simple singular isothermal sphere approximation. On the other hand, we could not fit B0712+472 and B2045+265 very well even with our models, although the \chi^2 were reduced compared with the case of using simple models. Our results clearly demonstrate that both the primary lens galaxy and the external perturbation are often more complicated than we usually assume. | |||||
| 書誌情報 |
Publications of the Astronomical Society of Japan en : Publications of the Astronomical Society of Japan 巻 56, 号 2, p. 253-260, 発行日 2004 |
|||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00046264 | |||||
| DOI | ||||||
| 関連タイプ | isVersionOf | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | https://doi.org/10.1093/pasj/56.2.253 | |||||
| 関連名称 | 10.1093/pasj/56.2.253 | |||||
| 権利 | ||||||
| 権利情報 | © Y. Kawano et al. | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://arxiv.org/help/general | |||||
| 関連名称 | Copyright | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 著者版フラグ | ||||||
| 出版タイプ | AM | |||||
| 出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
