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Chandra observations of the luminous infrared galaxy NGC 3256
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lira, Paulina Ward, Mike Zezas, Andreas Alonso-Herrero, Almudena Ueno, Shiro |
| Copyright Year | 2002 |
| Abstract | We present a detailed analysis of high-resolution Chandra observations of the merger system NGC 3256, the most infrared-luminous galaxy in the nearby universe. The X-ray data show that several discrete sources embedded in complex diffuse emission contribute * 20 per cent of the total emission ðLtot X , 8 £ 10 erg s in the 0:5–10 keV energy range). The compact sources are hard and extremely bright and their emission is probably dominated by accretiondriven processes. Both galaxy nuclei are detected with LX , 3–10 £ 10 erg s. No evidence is found for the presence of an active nucleus in the southern nucleus, contrary to previous speculation. Once the discrete sources are removed, the diffuse component has a soft spectrum that can be modelled by the superposition of three thermal plasma components with temperatures kT 1⁄4 0:6, 0.9 and 3.9 keV. Alternatively, the latter component can be described as a power law with index G , 3. Some evidence is found for a radial gradient of the amount of absorption and temperature of the diffuse component. We compare the X-ray emission with optical, Ha and NICMOS images of NGC 3256 and find a good correlation between the inferred optical/near-infrared and X-ray extinctions. Although inverse Compton scattering could be important in explaining the hard X-rays seen in the compact sources associated with the nuclei, the observed diffuse emission is probably of thermal origin. The observed X-ray characteristics support a scenario in which the powerful X-ray emission is driven solely by the current episode of star formation. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://repositorio.uchile.cl/bitstream/handle/2250/126067/Lira_P_Chandra_observations.pdf;jsessionid=3E48A13CB98664E8B03A6A9EECFFBD57?sequence=1 |
| Alternate Webpage(s) | http://dro.dur.ac.uk/1311/1/1311.pdf?DDD25+ |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Active galactic nucleus Cell Nucleus Diagnostic radiologic examination Embedded system Embedding GUCY2C protein, human Gradient Image resolution Inference Kiloelectronvolt Luminous Studio New General Catalogue Plasma Active Quantum superposition Radial (radio) Radial basis function Radiation X-Ray (Amazon Kindle) |
| Content Type | Text |
| Resource Type | Article |
