A Principle Component Analysis of Galaxy Properties from a Large, Gas-Selected Sample
Disney et al. (2008) have found a striking correlation among global parameters of Hi-selected galaxies and concluded that this is in conflict with the CDM model. Considering the importance of the issue, we reinvestigate the problem using the principal component analysis on a fivefold larger sample a...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2012/208901 |
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| author | Yu-Yen Chang Rikon Chao Wei-Hao Wang Pisin Chen |
| author_facet | Yu-Yen Chang Rikon Chao Wei-Hao Wang Pisin Chen |
| author_sort | Yu-Yen Chang |
| collection | DOAJ |
| description | Disney et al. (2008) have found a striking correlation among global parameters of Hi-selected galaxies and
concluded that this is in conflict with the CDM model. Considering the importance of the issue, we reinvestigate the problem using the principal component analysis on a fivefold larger sample and additional near-infrared data. We use databases from the Arecibo Legacy Fast Arecibo L-band Feed Array Survey for the gas properties, the Sloan Digital Sky Survey for the optical properties, and the Two Micron All Sky Survey for the near-infrared properties. We confirm that the parameters are indeed correlated where a single physical parameter can explain 83% of the variations. When color (g-i) is included, the first component still dominates but it develops a second principal component. In addition, the near-infrared color (i-J) shows an obvious second principal component that might provide evidence of the complex old star formation. Based on our data, we suggest that it is premature to pronounce the failure of the CDM model and it motivates more theoretical work. |
| format | Article |
| id | doaj-art-44980fd31cd4493db244f91de5911abf |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-44980fd31cd4493db244f91de5911abf2025-02-03T07:24:08ZengWileyAdvances in Astronomy1687-79691687-79772012-01-01201210.1155/2012/208901208901A Principle Component Analysis of Galaxy Properties from a Large, Gas-Selected SampleYu-Yen Chang0Rikon Chao1Wei-Hao Wang2Pisin Chen3Department of Physics and Graduate Institute of Astrophysics, National Taiwan University, Taipei 10617, TaiwanLeung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei 10617, TaiwanInstitute of Astronomy and Astrophysics, Academia Sinica, Taipei 10617, TaiwanDepartment of Physics and Graduate Institute of Astrophysics, National Taiwan University, Taipei 10617, TaiwanDisney et al. (2008) have found a striking correlation among global parameters of Hi-selected galaxies and concluded that this is in conflict with the CDM model. Considering the importance of the issue, we reinvestigate the problem using the principal component analysis on a fivefold larger sample and additional near-infrared data. We use databases from the Arecibo Legacy Fast Arecibo L-band Feed Array Survey for the gas properties, the Sloan Digital Sky Survey for the optical properties, and the Two Micron All Sky Survey for the near-infrared properties. We confirm that the parameters are indeed correlated where a single physical parameter can explain 83% of the variations. When color (g-i) is included, the first component still dominates but it develops a second principal component. In addition, the near-infrared color (i-J) shows an obvious second principal component that might provide evidence of the complex old star formation. Based on our data, we suggest that it is premature to pronounce the failure of the CDM model and it motivates more theoretical work.http://dx.doi.org/10.1155/2012/208901 |
| spellingShingle | Yu-Yen Chang Rikon Chao Wei-Hao Wang Pisin Chen A Principle Component Analysis of Galaxy Properties from a Large, Gas-Selected Sample Advances in Astronomy |
| title | A Principle Component Analysis of Galaxy Properties from a Large, Gas-Selected Sample |
| title_full | A Principle Component Analysis of Galaxy Properties from a Large, Gas-Selected Sample |
| title_fullStr | A Principle Component Analysis of Galaxy Properties from a Large, Gas-Selected Sample |
| title_full_unstemmed | A Principle Component Analysis of Galaxy Properties from a Large, Gas-Selected Sample |
| title_short | A Principle Component Analysis of Galaxy Properties from a Large, Gas-Selected Sample |
| title_sort | principle component analysis of galaxy properties from a large gas selected sample |
| url | http://dx.doi.org/10.1155/2012/208901 |
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