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Chandra Source Catalog Counterparts Classified via SDSS Spectroscopy

Presentation #105.25 in the session Missions and Instruments - Poster Session.

Published onMay 03, 2024
Chandra Source Catalog Counterparts Classified via SDSS Spectroscopy

The Chandra Source Catalog version 2.1 (CSC2.1) contains nearly four hundred thousand X-ray sources observed by Chandra from launch (1999) through 2021, covering about 800 square degrees. Optical and infrared spectra of about 20k counterparts are already public in the North, along with their pipeline classifications and velocities. The great majority are AGN, in part due to past SDSS targeting programs, but many of the X-ray sources with IR spectra are YSOs or X-ray binaries in the Galactic Plane, in regions too crowded for secure counterpart identification with most X-ray observatories. Meanwhile, the Sloan Digital Sky Survey V (SDSS-V) is obtaining new spectroscopy of tens of thousands more Chandra source counterparts across the entire sky, unbiased as to source type. We report on the public cross-matched catalog already made available by the Chandra X-ray Center, and the outlook for results of the ongoing SDSS-V campaign.

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