A DEEP CHANDRA OBSERVATION OF THE GIANT H II REGION N11. I. X-RAY SOURCES IN THE FIELD

Journal Article · Fri Aug 01 04:00:00 EDT 2014 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/213/2/23· OSTI ID:22340187

Nazé, Yaël ^[1]; Wang, Q. Daniel ^[2]; Chu, You-Hua; Gruendl, Robert ^[3]; Oskinova, Lida ^[4]

---

1. GAPHE, Department AGO, Université de Liège, Allée du 6 Août 17 Bat. B5C, B-4000 Liège (Belgium)
2. Department of Astronomy, B619E-LGRT, University of Massachusetts, Amherst, MA 01003 (United States)
3. Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801 (United States)
4. Institute for Physics and Astronomy, University of Potsdam, D-14476 Potsdam (Germany)

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{sup 32} erg s{sup –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 {sub X}/L {sub 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 {sub X}/L {sub 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.

• OSTI ID: 22340187
• Journal Information: Astrophysical Journal, Supplement Series, Journal Name: Astrophysical Journal, Supplement Series Journal Issue: 2 Vol. 213; ISSN 0067-0049; ISSN APJSA2
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CHANDRASEKHAR THEORY
DETECTION
EMISSION
HOT PLASMA
LUMINOSITY
MAGELLANIC CLOUDS
METALLICITY
POINT SOURCES
SIGNALS
STARS
X RADIATION
X-RAY SOURCES