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Optical Imaging of Very Luminous Infrared Galaxy Systems: Photometric Properties and Late Evolution
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Optical Imaging of Very Luminous Infrared Galaxy Systems: Photometric Properties and Late Evolution
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Optical Imaging of Very Luminous Infrared Galaxy Systems: Photometric Properties and Late Evolution
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Paper
Optical Imaging of Very Luminous Infrared Galaxy Systems: Photometric Properties and Late Evolution
2004
Overview
A sample of 19 low redshift (0.03\\(<\\)z\\(<\\)0.07) very luminous infrared galaxy (VLIRG: \\(10^{11}L_\\odot< \\) L[8-1000 \\(\\mu\\)m] \\( < 10^{12} L_\\odot\\)) systems (30 galaxies) has been imaged in \\(B\\), \\(V\\), and \\(I\\). These objects cover a luminosity range that is key to linking the most luminous infrared galaxies with the population of galaxies at large. We have obtained photometry for all of these VLIRG systems, the individual galaxies (when detached), and their nuclei, and the relative behavior of these classes has been studied in optical color-magnitude diagrams. The photometric properties of the sample are also compared with previously studied samples of ULIRGs. The mean observed photometric properties of VLIRG and ULIRG samples, considered as a whole, are indistinguishable at optical wavelengths. This suggests that not only ULIRG, but also the more numerous population of VLIRGs, have similar rest-frame optical photometric properties as the submillimeter galaxies (SMG), reinforcing the connection between low-{\\it z} LIRGs -- high-{\\it z} SMGs. When the nuclei of the {\\it young} and {\\it old} interacting systems are considered separately, some differences between the VLIRG and the ULIRG samples are found. In particular, the old VLIRGs are less luminous and redder than old ULIRG systems. If confirmed with larger samples, this behavior suggests that the late-stage evolution is different for VLIRGs and ULIRGs. Specifically, as suggested from spectroscopic data, the present photometric observations support the idea that the activity during the late phases of VLIRG evolution is dominated by starbursts, while a higher proportion of ULIRGs could evolve into a QSO type of object.
Publisher
Cornell University Library, arXiv.org
