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http://hdl.handle.net/2289/6872Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Saripalli, Lakshmi | - |
| dc.contributor.author | Roberts, David H | - |
| dc.date.accessioned | 2018-05-01T18:06:16Z | - |
| dc.date.available | 2018-05-01T18:06:16Z | - |
| dc.date.issued | 2018-01 | - |
| dc.identifier.citation | Astrophysical Journal, 2018, Vol. 852, p48 | en_US |
| dc.identifier.issn | 0004-637X | - |
| dc.identifier.issn | 1538-4357-(Online) | - |
| dc.identifier.uri | http://hdl.handle.net/2289/6872 | - |
| dc.description | Open Access | en_US |
| dc.description.abstract | In an earlier paper, we presented Jansky Very Large Array multi-frequency, multi-array continuum imaging of a unique sample of low-axial ratio radio galaxies. In this paper, the second in the series, we examine the images to learn the phenomenology of how the off-axis emission relates to the main radio source. Inversion-symmetric offset emission appears to be bimodal and to originate from one of two strategic locations: outer ends of radio lobes (outer-deviation) or from inner ends (inner-deviation). The latter sources are almost always associated with edge-brightened sources. With S- and Z-shaped sources being a subset of outer-deviation sources, this class lends itself naturally to explanations involving black hole axis precession. Our data allow us to present a plausible model for the more enigmatic inner-deviation sources with impressive wings; as for outer-deviation sources these too require black hole axis shifts, although they also require plasma backflows into relic channels. Evolution in morphology over time relates the variety in structures in inner-deviation sources including XRGs. With features such as non-collinearities, central inner-S "spine," corresponding lobe emission peaks, double and protruding hotspots not uncommon, black hole axis precession, drifts, or flips could be active in a significant fraction of radio sources with prominent off-axis emission. At least 4% of radio galaxies appear to undergo black hole axis rotation. Quasars offer a key signature for recognizing rotating axes. With a rich haul of sources that have likely undergone axis rotation, our work shows the usefulness of low-axial ratio sources in pursuing searches for binary supermassive black holes. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | IOP Sciences for The American Astronomical Society | en_US |
| dc.relation.uri | http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1710.01652 | en_US |
| dc.relation.uri | http://arxiv.org/abs/1710.01652 | en_US |
| dc.relation.uri | http://dx.doi.org/10.3847/1538-4357/aa9c4b | en_US |
| dc.rights | 2018 American Astronomical Society | en_US |
| dc.subject | radio continuum | en_US |
| dc.subject | galaxies | en_US |
| dc.title | What Are "X-Shaped" radio sources telling Us? II. properties of a sample of 87 | en_US |
| dc.type | Article | en_US |
| Appears in Collections: | Research Papers (A&A) | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2018_AsPJ_852_48.pdf | Open Access | 940 kB | Adobe PDF | View/Open |
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