A deep chandra observation of the giant HII REGION N11. I. X-Ray sources in the field

Yaël Nazé, Q. Daniel Wang, You Hua Chu, Robert Gruendl, Lida Oskinova

Research output: Contribution to journalArticle

Abstract

A very sensitive X-ray investigation of the giant H II region N11 in the Large Megallanic Cloud was performed using the Chandra X-ray Observatory. The 300 ks observation reveals X-ray sources with luminosities down to 10 32 erg s-1, increasing the number of known point sources in the field by more than a factor of five. Among these detections are 13 massive stars (3 compact groups of massive stars, 9 O stars, and one early B star) with log (L X/L BOL) -6.5 to -7, which may suggest that they are highly magnetic or colliding-wind systems. On the other hand, the stacked signal for regions corresponding to undetected O stars yields log (L X/L BOL) -7.3, i.e., an emission level comparable to similar Galactic stars despite the lower metallicity. Other point sources coincide with 11 foreground stars, 6 late-B/A stars in N11, and many background objects. This observation also uncovers the extent and detailed spatial properties of the soft, diffuse emission regions, but the presence of some hotter plasma in their spectra suggests contamination by the unresolved stellar population.

Original languageEnglish (US)
Article number23
JournalAstrophysical Journal, Supplement Series
Volume213
Issue number2
DOIs
StatePublished - Aug 1 2014

Keywords

  • ISM: individual objects (LMC N11)
  • Magellanic Clouds
  • X-rays: stars
  • galaxies: star clusters: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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