Suzaku Observation of Diffuse X-Ray Emission from a Southwest Region of the Carina Nebula
arXiv:1909.00501 · doi:10.1093/pasj/psz107
Abstract
A southwest region of the Carina nebula was observed with the Suzaku observatory for 47 ks in 2010 December. This region shows distinctively soft X-ray emission in the Chandra campaign observations. Suzaku clearly detects the diffuse emission above known foreground and background components between 0.4-5 keV at the surface brightness of 3.3x10^-14 erg s^{-1} arcmin^{-2}. The spectrum requires two plasma emission components with kT~0.2 and 0.5 keV, which suffer interstellar absorption of N_H~1.9x10^{21} cm^{-2}. Multiple absorption models assuming two temperature plasmas at ionization equilibrium or non-equilibrium are tested but there is no significant difference in terms of chi^2/d.o.f.. These plasma temperatures are similar to those of the central and eastern parts of the Carina nebula measured in earlier Suzaku observations, but the surface brightness of the hot component is significantly lower than those of the other regions. This means that these two plasma components are physically separated and have different origins. The elemental abundances of O, Ne and Mg with respect to Fe favor that the diffuse plasma originates from core-collapsed supernovae or massive stellar winds.
arXiv comment26 pages, 11 figures, accepted for publication in PASJ
References in corpus (23)
- Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
- The Relation Between Optical Extinction and Hydrogen Column Density in the Galaxy
- Hard X-ray Detector (HXD) on Board Suzaku
- Monte-Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis
- Chandra Orion Ultradeep Project: Observations and Source Lists
- XMM-Newton Observation of Solar Wind Charge Exchange Emission
- Nucleosynthesis in Type II Supernovae
- Study of the X-Ray Background Spectrum and its Large-Scale Fluctuation with ASCA
- Ten Million Degree Gas in M 17 and the Rosette Nebula: X-ray Flows in Galactic H II Regions
- Million-Degree Plasma Pervading the Extended Orion Nebula
- An Introduction to the Chandra Carina Complex Project
- A Catalog of Chandra X-ray Sources in the Carina Nebula
- High-Mass Cloud Cores in the eta Carinae Giant Molecular Cloud
- The Integrated Diffuse X-ray Emission of the Carina Nebula Compared to Other Massive Star-forming Regions
- The Chandra Carina Complex Project: Deciphering the Enigma of Carina's Diffuse X-ray Emission
- Investigation of Diffuse Hard X-ray Emission from the Massive Star-Forming Region NGC 6334
- A Smoking Gun in the Carina Nebula
- Supernova Remnants in the Magellanic Clouds. VI. The DEML316 Supernova Remnants
- Suzaku Observation of Diffuse X-ray Emission from the Carina Nebula
- Enhancement of Terrestrial Diffuse X-ray Emission Associated With Coronal Mass Ejection and Geomagnetic Storm
- Suzaku Spectroscopy of the Extended X-Ray Emission in M17
- The X-ray spectrum of delta Orionis observed by LETGS aboard Chandra
- Discovery of Diffuse X-ray Emission in One of the Nearest Massive Star-Forming Regions NGC 2024