Sgr A* X-ray Visionary Project --- The First High Resolution X-ray Spectrum of Sgr A* and the Central Parsec

Details Sgr A* X-ray Visionary Project --- The First High Resolution X-ray Spectrum of Sgr A* and the Central Parsec Sgr A* X-ray Visionary Project --- The First High Resolution X-ray Spectrum of Sgr A* and the Central Parsec

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932104b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #321.04

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Scientific paper

Over the past dozen years, Chandra has performed extensive imaging spectroscopy of Sgr A* and its environment. The images, photometry, light curves and CCD-quality spectra of Sgr A* have revolutionized our understanding of ultra-sub-Eddington accretion onto our galaxy's supermassive black hole/quiescent AGN. In 2012, we will take these observations to the next level with an approved Chandra X-ray Visionary Project (XVP) to perform a 3-Ms HETG exposure to spatially and spectrally resolve the accretion flow within the Bondi radius of Sgr A*. This will provide the first high spectral resolution data on Sgr A* and diffuse emission from the central parsec of the galaxy. The spectrum will measure the energy and velocity width of the known Fe line from matter within the Bondi radius. It will also detect plasma line emission (e.g., Si & S), if present at levels predicted by RIAF models. Polarization measurements suggest most of the matter crossing the Bondi radius does not reach the event horizon. Understanding the dynamics and thermal structure of this plasma will tell us how this matter flows in and how much and where some of it flows back out. We will present a detailed simulation of the expected spectrum, and discuss how it relates to other LLAGN as a function of accretion rate. This project will permit extensive multiwavelength monitoring of Sgr A* flares that will provide stringent broadband spectral and temporal constraints on 3D GRMHD simulations of the Sgr A* accretion flow and its flaring activity. It will also produce light curves with increased cadence of faint X-ray transients, placing further constraints on the population of stellar remnants near Sgr A*. We are currently proposing for ground-based monitoring using observatories in the radio through gamma-rays. Absolutely no other current or planned X-ray mission can perform this science.

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