Total magnitudes of Virgo galaxies - III. Scale errors in the Reference Catalogue of Bright Galaxies T system and light-profile distortion by resolution-degrading and differential-distance effects
文献类型：期刊论文
| 作者 | Young, CK |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2004-11-11 |
| 卷号 | 354期号:4页码:1011-1019 |
| 关键词 | catalogues galaxies : clusters : individual : Virgo galaxies : distances and redshifts galaxies : fundamental parameters galaxies : photometry |
| 英文摘要 | We investigate the B-T magnitude scales of the Second and Third Reference Catalogues of Bright Galaxies, finding both scales to be reasonably reliable for 11.5 less than or similar to B-t less than or similar to 14.0. However, large-scale errors of 0.26 and 0.24 mag per unit mag interval respectively are uncovered for early-type galaxies at the bright ends, whilst even larger ones of 0.74 and 0.36 mag per unit mag interval are found for galaxies of all morphological types at the faint ends. We attribute this situation to several effects already discussed by Young et al. and Young (Paper I), including the application of relatively inflexible growth-curve models that are only in a few specific cases appropriate to the galaxies concerned. Of particular interest to this study though, we find that the apparent profile shapes of giant galaxies in the Virgo direction of cz < 15 000 km s(-1) tend to be less centrally concentrated the greater their distance. This demonstrates that even for relatively nearby galaxies, the distortion of the overall shapes of light profiles by resolution-degrading effects such as seeing and data smoothing, as originally predicted and modelled by Young & Currie and Young et al., is a significant effect. It is, therefore, not good practice simply to extrapolate the profiles of galaxies of identical intrinsic size and intrinsic profile shape (i.e. identical morphology) by means of the same growth-curve model, unless the galaxies are known a priori to be at the same distance and unless their photometry is of the same angular resolution. We also investigate the total-magnitude scale of the catalogue of photometric types of Prugniel & Heraudeau, finding it to be much more reliable than the B-T one. However, we argue that photometric type is really a measure of apparent profile shape (i.e. intrinsic profile shape after scale reduction on account of distance followed by convolution with a seeing disc and often a smoothing function as well). Strictly, it should therefore only be applicable to comparisons between galaxies that are already known to be at similar distances provided that their photometry is also of similar angular resolution. Clearly, this must complicate attempts to construct quantitative morphological classification schemes for galaxies. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DWARF-ELLIPTIC GALAXIES ; BAND SURFACE PHOTOMETRY ; SERSIC PROFILES ; SPIRAL GALAXIES ; FORNAX CLUSTER ; COLOR INDEXES ; PARAMETERS ; INDICATOR ; BULGES ; ZWICKY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000224922600010 |
| 源URL | [http://119.78.226.72/handle/331011/18327]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China 4.Univ New S Wales, Sch Phys, Dept Astrophys & Opt, Sydney, NSW 2052, Australia |
| 推荐引用方式 GB/T 7714 | Young, CK. Total magnitudes of Virgo galaxies - III. Scale errors in the Reference Catalogue of Bright Galaxies T system and light-profile distortion by resolution-degrading and differential-distance effects[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2004,354(4):1011-1019. |
| APA | Young, CK.(2004).Total magnitudes of Virgo galaxies - III. Scale errors in the Reference Catalogue of Bright Galaxies T system and light-profile distortion by resolution-degrading and differential-distance effects.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,354(4),1011-1019. |
| MLA | Young, CK."Total magnitudes of Virgo galaxies - III. Scale errors in the Reference Catalogue of Bright Galaxies T system and light-profile distortion by resolution-degrading and differential-distance effects".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 354.4(2004):1011-1019. |
入库方式： OAI收割
来源：上海天文台
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