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Spectral Energy Distributions of Local Luminous and Ultraluminous Infrared Galaxies
| Content Provider | Semantic Scholar |
|---|---|
| Author | Vivian, U. Armus, Lee Iwasawa, Kazushi Kim, Dae Choul Chan, Ben Ping-Shing Haan, Sebastian Inami, Hanae |
| Copyright Year | 2012 |
| Abstract | Luminous (LIRGs; log (LIR/L ) = 11.00–11.99) and ultraluminous infrared galaxies (ULIRGs; log (LIR/L ) = 12.00–12.99) are the most extreme star-forming galaxies in the universe. The local (U)LIRGs provide a unique opportunity to study their multi-wavelength properties in detail for comparison with their more numerous counterparts at high redshifts. We present common large aperture photometry at radio through X-ray wavelengths and spectral energy distributions (SEDs) for a sample of 53 nearby (z < 0.083) LIRGs and 11 ULIRGs spanning log (LIR/L ) = 11.14–12.57 from the flux-limited (f60 μm > 5.24 Jy) Great Observatories All-sky LIRG Survey. The SEDs for all objects are similar in that they show a broad, thermal stellar peak (∼0.3–2 μm), and a dominant FIR (∼40–200 μm) thermal dust peak, where νLν(60 μm)/νLν(V ) increases from ∼2 to 30 with increasing LIR. When normalized at IRAS 60 μm, the largest range in the luminosity ratio, R(λ) ≡ log[νLν(λ)/νLν(60 μm)], observed over the full sample is seen in the hard X-rays (HX = 2–10 keV), where ΔRHX = 3.73 (R̄HX = −3.10). A small range is found in the radio (1.4 GHz), ΔR1.4 GHz = 1.75, where the mean ratio is largest, (R̄1.4 GHz = −5.81). Total infrared luminosities, LIR(8–1000 μm), dust temperatures, and dust masses were computed from fitting thermal dust emission modified blackbodies to the mid-infrared (MIR) through submillimeter SEDs. The new results reflect an overall ∼0.02 dex lower luminosity than the original IRAS values. Total stellar masses were computed by fitting stellar population synthesis models to the observed near-infrared (NIR) through ultraviolet (UV) SEDs. Mean stellar masses are found to be log(M /M ) = 10.79 ± 0.40. Star formation rates have been determined from the infrared (SFRIR ∼ 45 M yr−1) and from the monochromatic UV luminosities (SFRUV ∼ 1.3 M yr−1), respectively. Multi-wavelength active galactic nucleus (AGN) indicators have be used to select putative AGNs: About 60% of the ULIRGs would have been classified as an AGN by at least one of the selection criteria. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://authors.library.caltech.edu/36268/1/0067-0049_203_1_9.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Active galactic nucleus CD300C gene Cell Nucleus Classification Dex Diagnostic radiologic examination File spanning Finite impulse response GUCY2C protein, human Hardware-based full disk encryption Kiloelectronvolt Largest Luminous Studio Monochrome NISCH gene Numerous Photometry Physical object Quantum well infrared photodetector Radiation Spectroscopy, Near-Infrared Stellar (payment network) wavelength |
| Content Type | Text |
| Resource Type | Article |
