Constraining the Galactic Structure with Stellar Clusters in Obscured Hii Regions

2009 ◽  
pp. 321-326
Author(s):  
M. Messineo ◽  
M. Petr-Gotzens ◽  
K. M. Menten ◽  
F. Schuller ◽  
H. J. Habing
Keyword(s):  
Hii Regions ◽  
Galactic Structure ◽  
Stellar Clusters

scholarly journals A 12CO Survey of the LMC with NANTEN

1999 ◽  
Vol 190 ◽  
pp. 61-66
Author(s):  
Y. Fukui ◽  
R. Abe ◽  
A. Hara ◽  
T. Hayakawa ◽  
S. Kato ◽  
...  
Keyword(s):  
Molecular Clouds ◽  
Cluster Formation ◽  
Hii Regions ◽  
Stellar Clusters ◽  
Giant Molecular Clouds

We have made a 12CO(J = 1−0) survey of the LMC with NANTEN. A sample of 55 giant molecular clouds has been identified and comparisons with stellar clusters, HII regions and SNRs are presented. The connection between the clouds and cluster formation is discussed.

scholarly journals Interpretation of the apparent anomalies of the Galactic structure

1985 ◽  
Vol 106 ◽  
pp. 305-308
Author(s):  
T. Jaakkola ◽  
N. Holsti ◽  
P. Teerikorpi
Keyword(s):  
Spiral Structure ◽  
Neutral Hydrogen ◽  
Hii Regions ◽  
Galactic Structure ◽  
Circular Motion ◽  
The Sun ◽  
The South ◽  
The North ◽  
Perseus Arm ◽  
Strong Curvature

In maps of the galactic structure based on the kinematical method (Fig. 1) several systematically heliocentric anomalies are found: 1. Assuming purely circular motion, the spiral arms are more tightly wound and the extent of neutral hydrogen is smaller in the northern galactic hemisphere than in the southern one. 2. With separate rotation curves for the north and the south, the arms become anomalously circular. 3. Consequently, there is a striking discrepancy with the stellar spiral structure. 4. There are long straight portions in the arms pointing towards the Sun. 5. There are abrupt knee-like features in the south. 6. Some arms seem to affect the structure of other, outer arms. 7. Conspicuously strong curvature of the arms is found in the north. 8. The HI-density is enhanced at symmetric longitudes on the far side. 9. With the northern rotation model HII-regions and HI avoid the southern tangential circle. 10. The Perseus Arm is displaced at 1 = 180°.

scholarly journals Clusters in Extragalactic HII Regions and their Modelling

2002 ◽  
Vol 207 ◽  
pp. 428-438
Author(s):  
Rosa María González Delgado
Keyword(s):  
Hii Regions ◽  
Starburst Galaxies ◽  
Stellar Clusters ◽  
Stellar Content ◽  
Evolutionary State ◽  
Optical Wavelengths

This review deals with properties of very young (≤ 10–20 Myr) stellar clusters which are in the nebular phase and are embedded in photoionized regions (classical extragalactic HII regions (RHIIs) or starburst galaxies). Based on the analysis of the integrated light of these clusters at the UV and optical wavelengths, different techniques are discussed that allow to estimate in consistent the stellar content and the evolutionary state of the ionizing clusters. Figures illustrating this contribution can be found in: http://www.iaa.csic.es/∼rosa/

scholarly journals Formaldehyde observations at XAO

2012 ◽  
Vol 8 (S292) ◽  
pp. 62-62
Author(s):  
Gang Wu ◽  
Jarken Esimbek ◽  
Jian-Jun Zhou ◽  
Wei-Guang Ji
Keyword(s):  
Hii Regions ◽  
Galactic Structure ◽  
Astronomical Observatory

AbstractIn recent years our team has performed H2CO(110 − 111) observations towards GMCs and HII regions with the Xinjiang Astronomical Observatory, CAS. Here, we provide a summary of these observations. More than 200 new formaldehyde sources are detected, 8 extended GMC have been mapped, kinetic distances, Galactic structure and a related discussion are provided.

A New Interpretation of the Galactic Structure from HII Regions

1970 ◽  
pp. 209-212 ◽  
Author(s):  
G. Courtès ◽  
Y. P. Georgelin ◽  
Y. M. Georgelin ◽  
G. Monnet
Keyword(s):  
Hii Regions ◽  
Galactic Structure ◽  
New Interpretation

scholarly journals Molecular Clouds in the LMC Observed with NANTEN: III. Comparison with HII Regions

1999 ◽  
Vol 190 ◽  
pp. 130-131
Author(s):  
R. Abe ◽  
A. Hara ◽  
T. Hayakawa ◽  
S. Kato ◽  
A. Kawamura ◽  
...  
Keyword(s):  
Molecular Clouds ◽  
Hii Regions ◽  
Stellar Clusters ◽  
Giant Molecular Clouds

We have made 12CO(J=1-0) observations in the LMC with NANTEN, and compared the detected giant molecular clouds (GMCs) with HII regions and stellar clusters. It is found that ~ 80% of the GMCs are associated with HII regions. The results of comparisons of the GMCs with the HII regions and the stellar clusters are presented.

scholarly journals Galactic structure and stellar clusters in obscured Hll regions.

2006 ◽  
Vol 54 ◽  
pp. 238-242 ◽  
Author(s):  
Maria Messineo ◽  
Monika Petr-Gotzens ◽  
Karl M Menten ◽  
Frédéric Schuller ◽  
Harm J Habing
Keyword(s):  
Galactic Structure ◽  
Stellar Clusters

scholarly journals Age Effects in Giant Extragalactic HII Regions

1989 ◽  
Vol 120 ◽  
pp. 369-369
Author(s):  
J. Masegosa ◽  
M. Moles
Keyword(s):  
Hii Regions ◽  
Age Effects ◽  
The Other ◽  
Stellar Clusters ◽  
Other Hand ◽  
Observational Errors ◽  
Spatial Inhomogeneities

Spatial inhomogeneities for a sample of Giant Extragalactic HII Regions (GEHR) have been analyzed. The results indicate that, whitin the observational errors, the O/H and He/H abundance ratios are constant for a given GEHR. The Ne/O ratio on the other hand shows a trend with the evolution of the ionizing stellar clusters.

scholarly journals Determination of Galactic spiral structure at radiofrequencies

1985 ◽  
Vol 106 ◽  
pp. 283-300 ◽  
Author(s):  
H. S. Liszt
Keyword(s):  
Spiral Structure ◽  
Hii Regions ◽  
Galactic Structure ◽  
Spiral Pattern ◽  
Galactic Spiral Structure ◽  
Galactic Spiral ◽  
Adequate Method

We consider some results of attempts to trace the pattern of galactic spiral structure in HII regions, HI, and CO. There is really no adequate method available for solving this problem, a fact reflected in the lack of consensus regarding the “correct” spiral pattern. The newly-begun process of deriving galactic structure in CO seems to be recapitulating the history laid down by HI observers.

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