تقرير
The Environments of Local Luminous Infrared Galaxies: Star Formation Rates increase with Density
| العنوان: | The Environments of Local Luminous Infrared Galaxies: Star Formation Rates increase with Density |
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| المؤلفون: | Tekola, Abiy G., Vaisanen, Petri, Berlind, Andreas |
| سنة النشر: | 2011 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | This work studies the environments and star formation relationships of local luminous infrared galaxies (LIRG) in comparison to other types of local and distant (z~1) galaxies. The infrared (IR) galaxies are drawn from the IRAS sample. The density of the environment is quantified using 6dF and Point Source Catalogue redshift survey (PSCz) galaxies in a cylinder of 2h^-1 Mpc radius and 10h^-1 Mpc length. Our most important result shows the existence of a dramatic density difference between local LIRGs and local non-LIRG IR galaxies. LIRGs live in denser environments than non-LIRG IR galaxies implying that L_IR=10^11 h^-2 L_sun marks an important transition point among IR-selected local galaxies. We also find that there is a strong correlation between the densities around LIRGs and their L_IR luminosity, while the IR-activity of non-LIRG IR galaxies does not show any dependence on environment. This trend is independent of mass-bin selection. The SF-density trend in local LIRGs is similar to that found in some studies of blue cloud galaxies at z~1 which show a correlation between star formation and local density (the reversal of the relation seen for local galaxies). This, together with the rapid decline of the number count of LIRGs since z~1, could mean that local LIRGs are survivors of whatever process transformed blue cloud galaxies at z~1 to the present day or local LIRGs came into existence by similar process than high redshift LIRGs but at later stage. Comment: 13 pages with 6 figures. Discussion expanded and references added to match accepted MNRAS version, results unchanged |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2011.19773.x |
| URL الوصول: | http://arxiv.org/abs/1101.3495 |
| رقم الأكسشن: | edsarx.1101.3495 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1111/j.1365-2966.2011.19773.x |
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