The Gaia-WISE Extragalactic Astrometric Catalog
| Autor: | Paine, Jennie, Darling, Jeremy, Truebenbach, Alexandra |
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| Rok vydání: | 2018 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-4365/aabe2d |
| Popis: | The Gaia mission has detected a large number of active galactic nuclei (AGN) and galaxies, but these objects must be identified among the 1000-fold more numerous stars. Extant astrometric AGN catalogs do not have the uniform sky coverage required to detect and characterize the all-sky low-multipole proper motion signals produced by the barycenter motion, gravitational waves, and cosmological effects. To remedy this, we present an all-sky sample of 567,721 AGN in Gaia Data Release 1, selected using WISE two-color criteria. The catalog has fairly uniform sky coverage beyond the Galactic plane, with a mean density of 12.8 AGN per square degree. The objects have magnitudes ranging from $G=8.8$ down to Gaia's magnitude limit, $G=20.7$. The catalog is approximately 50% complete but suffers from low stellar contamination, roughly 0.2%. We predict that the end-of-mission Gaia proper motions for this catalog will enable detection of the secular aberration drift to high significance (23$\sigma$) and will limit the anisotropy of the Hubble expansion to about 2%. Comment: 11 pages, 7 figures; Submitted to ApJS |
| Databáze: | arXiv |
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