scholarly journals Subarcsecond Resolution Mid-Infrared Observations of Super Star Clusters in the Antennae (NGC 4038/4039)

2006 ◽  
Vol 648 (1) ◽  
pp. L25-L28 ◽  
Author(s):  
L. Snijders ◽  
P. P. van der Werf ◽  
B. R. Brandl ◽  
S. Mengel ◽  
D. Schaerer ◽  
...  
Keyword(s):  
Star Clusters ◽  
Mid Infrared ◽  
Infrared Observations ◽  
Super Star Clusters

scholarly journals The Mid-Infrared Properties of Embedded Super Star Clusters in He2-10 and IIZw40

2006 ◽  
Vol 2 (S235) ◽  
pp. 329-329
Author(s):  
I. Sakon ◽  
T. Onaka ◽  
H. Takahashi ◽  
T. Miyata ◽  
S. Sako ◽  
...  
Keyword(s):  
Star Clusters ◽  
Infrared Camera ◽  
Infrared Images ◽  
Mid Infrared ◽  
The Galaxy ◽  
Western Border ◽  
Polycyclic Aromatic ◽  
Imaging And Spectroscopy ◽  
Band Spectra ◽  
Super Star Clusters

We observed embedded super-star clusters (SSCs) in blue compact dwarf galaxies (BCDs) IIZw40 and He2-10 with N-band and Q-band imaging and spectroscopy using the Cooled Mid-Infrared Camera and Spectrometer (COMICS) on board the 8m Subaru Telescope. Our infrared images of Henize 2–10 resolve the radio knots (knots I-V; Kobulnicky & Johnson 1999) and the N- and Q-band spectra show the strong [NeII] 12.8 μm and the [SIII] 18.71 μm together with relatively weak [SIV] 10.51 μm and [ArIII] 8.99 μm as well as the distinct unidentified infrared (UIR) bands at 8.6, 11.2 and 12.7 μm. We find the typical stellar spectral type of the members in the SSCs is O9 using the CoStar model (Stasinska & Schaerer 1997) and that the ionization environment in the most deeply embedded SSC(POS/#D) is the softest among those SSCs. The UIR bands exhibit a flat distribution over the galaxy and do not show a correlation with the MIR continuum, suggesting that polycyclic aromatic hydrocarbons (PAHs) are not strongly associated with the SSCs. We also find a possible decrease in the UIR 12.7 μm/11.2 μm ratio inside the embedded SSCs, suggesting that smooth-edged large PAHs are dominant (Hony et al. 2001) there. The small UIR to continuum ratio inside the embedded SSCs also suggests that the size distribution of the carbonaceous dust is skewed to the larger ones inside the embedded SSCs. Possible destruction of smaller species by harsh radiation field in the vicinity of massive stars due to the smaller heat capacity and/or the coagulation process that have been undertaken in dense dusty embedded SSCs would explain our results consistently. From the mid-infrared spectroscopy of IIZw40, the UIR bands are detected only in the south-western border of the mid-infrared peaks, suggesting the uneven distribution of PAHs within 4×106yr (Vanzi et al. 1996) after the nuclear starburst triggered in the merging of two small original galaxies.

scholarly journals Super star clusters and their emission lines

2009 ◽  
Vol 5 (S266) ◽  
pp. 555-555
Author(s):  
Richard Wünsch ◽  
Jan Palouš ◽  
Guillermo Tenorio–Tagle ◽  
Sergiy Silich ◽  
Casiana Muñoz–Tuñón
Keyword(s):  
Rarefied Gas ◽  
Star Clusters ◽  
Emission Lines ◽  
Cluster Center ◽  
Strong Emission ◽  
Infrared Observations ◽  
Narrow Component ◽  
Component Line ◽  
Super Star Clusters ◽  
2D And 3D

AbstractSuper star clusters (SSCs) are young massive objects typically observed in starburst galaxies. They consist of millions of stars occupying volumes only several parsecs across. Recent infrared observations of SSCs reveal strong emission lines with moderately supersonic widths (FWHM ~ 50 – 100 km s−1). An additional, much broader and weaker line component is present in some cases. Using 2D and 3D hydrodynamic simulations, we study models of SSCs in the so-called bimodal regime, which occurs if the stellar density inside the cluster exceeds a certain limit. We confirm the existence of the bimodal solution predicted analytically and suggest an explanation for double-component line profiles: the narrow component is formed close to the cluster center by repressurizing shocks compressing the rarefied gas cooled down due to the thermal instability into dense cold clumps, while the broad component is created by the wind, which cools down at a certain distance from the cluster.

Cycles of Variability in Jupiter's Atmosphere from Ground-Based Mid-Infrared Observations

2021 ◽  
Author(s):  
Arrate Antunano ◽  
Leigh N Fletcher ◽  
Glenn S Orton ◽  
Henrik Melin ◽  
Padraig T. Donnelly ◽  
...  
Keyword(s):  
Mid Infrared ◽  
Infrared Observations

scholarly journals Bulge Formation from Super Star Clusters in a Responding Cuspy Dark Matter Halo

2007 ◽  
Vol 662 (1) ◽  
pp. 250-258
Author(s):  
Yan‐Ning Fu ◽  
Wen‐Hao Liu ◽  
Jie‐Hao Huang ◽  
Zu‐Gan Deng
Keyword(s):  
Dark Matter ◽  
Star Clusters ◽  
Dark Matter Halo ◽  
Super Star Clusters ◽  
Bulge Formation

scholarly journals The Molecular Interstellar Medium in the Super Star Clusters of the Starburst NGC 253

2020 ◽  
Vol 897 (2) ◽  
pp. 176 ◽  
Author(s):  
Nico Krieger ◽  
Alberto D. Bolatto ◽  
Adam K. Leroy ◽  
Rebecca C. Levy ◽  
Elisabeth A. C. Mills ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Star Clusters ◽  
Super Star Clusters
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