X-Ray Emission from Young Stars in the Massive Star-forming Region IRAS 20126+4104

• Published in: The Astronomical journal 2011-11, Vol.142 (5), p.158-jQuery1323896838864='48'
• Main Authors: Anderson, C. N, Hofner, P, Shepherd, D, Creech-Eakman, M
• Format: Article
• Language: English
• Subjects: Absorption; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC RAY SOURCES; COSMIC X-RAY SOURCES; Counting; ELEMENTS; EMISSION; HYDROGEN; IRON; LUMINOSITY; MAIN SEQUENCE STARS; METALS; NONMETALS; OPTICAL PROPERTIES; PHOTON EMISSION; PHYSICAL PROPERTIES; PROTOSTARS; Radio; SPECTRA; Spectral emissivity; STARS; TRANSITION ELEMENTS; X-RAY SPECTRA; X-rays
• ISSN: 1538-3881; 0004-6256; 1538-3881
• DOI: 10.1088/0004-6256/142/5/158

We present a 40 ks Chandra observation of the IRAS 20126+4104 core region. In the inner 6'' two X-ray sources were detected, which are coincident with the radio jet source Delta *b0S and the variable radio source Delta *b0Var. No X-ray emission was detected from the nearby massive protostar Delta *b0N. The spectra of both detected sources are hard and highly absorbed, with no emission below 3 keV. For Delta *b0S, the measured 0.5-8 keV count rate was 4.3 counts ks--1. The X-ray spectrum was fitted with an absorbed 1T APEC model with an energy of kT =10 keV and an absorbing column of N H = 1.2 X 1023 cm--2. An unabsorbed X-ray luminosity of about 1.4 X 1032 erg s--1 was estimated. The spectrum shows broad line emission between 6.4 and 6.7 keV, indicative of emission from both neutral and highly ionized iron. The X-ray light curve indicates that Delta *b0S is marginally variable; however, no flare emission was observed. The variable radio source Delta *b0Var was detected with a count rate of 0.9 counts ks--1 but there was no evidence of X-ray variability. The best-fit spectral model is a 1T APEC model with an absorbing hydrogen column of N H = 1.1 X 1023 cm--2 and a plasma energy of kT = 6.0 keV. The unabsorbed X-ray luminosity is about 3 X 1031 erg s--1.