X-rays From The Exciting Region Of Cepheus A

Details X-rays From The Exciting Region Of Cepheus A X-rays From The Exciting Region Of Cepheus A

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.181p&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

Computer Science

Stellar Spectroscopy

Scientific paper

We report an observation of X-ray emission from the exciting region of Cepheus A with the Chandra/ACIS instrument. What had been an unresolved X-ray source comprising the putative power sources is now resolved into at least 3 point-like sources, each with similar X-ray properties and differing radio and submillimeter properties. They each have inferred X-ray luminosities ≥ 10^{31} erg s^{-1} with hard spectra, T ≥ 10^7 K, and high low-energy absorption equivalent to tens to as much as a hundred magnitudes of visual absorption. The star usually assumed to be the most massive and energetic, HW2, is not detected with an upper limit about 7 times lower than the detections. The X-rays may arise via thermal bremsstrahlung in diffuse emission regions associated with a gyrosynchrotron source for the radio emission, or they could arise from powerful stellar winds. We also analyzed the Spitzer/IRAC mid-IR observation from this star-formation region and present the X-ray results and mid-IR classifications of the nearby stars. The X-ray emission from HH 168 is confirmed and it is not as underluminous in X-rays as previously believed. Copyright 2009 California Institute of Technology. Government sponsorship acknowledged.

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