Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.0227y&link_type=abstract
American Astronomical Society Meeting 210, #02.27; Bulletin of the American Astronomical Society, Vol. 39, p.97
Astronomy and Astrophysics
Astronomy
Scientific paper
HotGAS (http://hotgas.pha.jhu.edu) contains high-level data products from Chandra observations using the High Energy Grating Spectrometer (HETGS). Products are available from the archive in various formats and are suitable for use by non-experts and experts alike. Easy and user-friendly access for non X-ray astronomers to reprocessed, publishable quality grating data products lend themselves to promote inter-disciplinary and multi-wavelength research on active galactic nuclei (AGN). Absorption and emission features can be used to study mass outflows, signatures of the accretion flow, as well as the IGM. We show some results from one of the most intriguing data sets, a HETG observation of the z=0.297 quasar E1821+643. This source is the highest luminosity quasar to show a relativistically broadened Fe K emission line (likely from the accretion disk), as well as a highly redshifted absorption line. The latter could be due to inflow or to an outflow originating in the strong gravity regime of the black hole. We derive a general result that if an absorption line is unresolved with an upper limit width of W, then for outflows more compact than c/W gravitational radii, a robust lower limit on the mass outflow rate is implied. HotGAS will also be useful for proposal preparation and observation planning for future missions, as well as for training students in high-resolution X-ray spectroscopy and for providing a resource for projects. Theoreticians may find HotGAS useful for testing their models without having to deal with the fine details of data processing and reduction. Contingent upon funding, we plan to eventually expand HotGAS to include all the HETG and LETG AGN data, as well XMM RGS data. Further in the future we plan to include data from X-ray binaries. The initial phase of HotGAS has been funded by an archival Chandra grant.
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