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High Resolution Tip / Tilt Near-Infrared Imaging of Warm Ultraluminous Infrared Galaxies
| Content Provider | Semantic Scholar |
|---|---|
| Copyright Year | 1998 |
| Abstract | We present high spatial resolution (FWHM ≈ 0.3–0.5) H (1.6μm) and K (2.1μm) images of a complete sample (12) of ultraluminous infrared galaxies (ULIGs) chosen to have “warm” mid-infrared colors (f25/f60 > 0.2) known to be characteristic of active galaxies. The extended underlying galaxy is detected in each system at H and K , as are tidal features and many of the star forming knots seen at optical wavelengths. While some of these knots have a considerable near-infrared excess, we show that they are likely to have bolometric luminosities more similar to that of the extended starbursts with similar optical morphology seen in less far-infrared luminous interacting systems. We find that each ULIG has increasing contributions at long wavelengths by a very compact source which we identify as an active galactic nucleus (AGN). We show that the optical/nearinfrared colors of these putative nuclei are much more extreme than the most active starburst IRAS galaxies, yet are identical to “far-infrared loud” quasars which are in turn similar to optical quasars combined with large quantities of hot (≈800 K) dust. Half of the ULIGs have nuclei with dereddened near-infrared luminosities comparable to those of QSOs, while the other half have dereddened luminosities more similar to Seyferts, although this may be an effect of patchy extinction and scattering. Subject headings: infrared: galaxies—galaxies: star clusters—galaxies: galaxies: active—galaxies: starburst Author’s note — due to space considerations in this pre-print, the figure quality has been downgraded. A higher quality preprint can be obtained from http://spider.ipac.caltech.edu/~jason or by writing the author directly. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/9809184v2.pdf |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/9809184v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Active galactic nucleus Cell Nucleus Color Full Width at Half Maximum GUCY2C protein, human Galaxy morphological classification Interaction Knot (unit) Luminous Studio Medical Subject Headings Offset binary Quantity Spectroscopy, Near-Infrared Star Wars Galaxies wavelength |
| Content Type | Text |
| Resource Type | Article |
