Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1210t&link_type=abstract
American Astronomical Society Meeting 210, #12.10; Bulletin of the American Astronomical Society, Vol. 39, p.110
Mathematics
Logic
Scientific paper
We present ongoing results from the Chandra ACIS Survey of M33 (ChASeM33), a 1.4Ms deep survey to investigate the small and large-scale distribution of the Hot Ionized Medium (HIM), the source populations that shape it, and their mutual interaction. ChASeM33 (Sasaki et al., 2007) provides the highest angular resolution yet achievable in X-ray astronomy (1") and has a limiting luminosity for point sources (0.35-8.0keV bandpass) of 1E35 erg/s. In this study we focus on the diffuse extended X-ray emission from the giant HII-region NGC604. We present deep (300ks) ACIS-I X-ray images in different energy bands that show an unprecedented level of detail. The most striking results concern the spatial extent of the soft X-ray emission and the remarkably good morphological anti-correlation between soft X-rays (0.35-1.1keV) and Halpha. The soft X-ray emission is substantially more extended along the N-S axis of NGC604 than previous measurements indicate, almost reaching the full extent of the Halpha-emitting gas. A morphological comparison between X-ray, FUV, optical, and FIR emission suggests that the various (super)bubbles visible in Halpha are filled with hot X-ray emitting gas and are powered by the massive OB and WR-star associations in their centers. Provided that the prominent Halpha-structures confine and shape the HIM, it appears reasonable to consider NGC604 to be a giant "boiling" HII-region whose superbubbles haven't reached the critical breakout-stage. Spectra we have extracted of the faint diffuse emission within and around these superbubbles should enable us to obtain the first estimates of the filling factors for these regions. These poorly constrained parameters, together with measured gas temperatures, densities, and cooling times, will enter into the first detailed non-ionization-equilibrium simulations of NGC604, to cross-check our current understanding on the formation and evolution of such superbubbles.
This work was supported by NASA Chandra award number GO6-7073A.
Blair William Patrick
Breitschwerdt Dieter
ChASeM33-team
de Avillez Miguel A.
Gaetz Terrance J.
No associations
LandOfFree
Chandra ACIS Survey of M33 (ChASeM33): Investigating the Hot Ionized Medium of NGC604 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chandra ACIS Survey of M33 (ChASeM33): Investigating the Hot Ionized Medium of NGC604, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chandra ACIS Survey of M33 (ChASeM33): Investigating the Hot Ionized Medium of NGC604 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1028420