scholarly journals Modeling the Near‐Infrared Luminosity Functions of Young Stellar Clusters

2000 ◽  
Vol 533 (1) ◽  
pp. 358-371 ◽  
Author(s):  
August A. Muench ◽  
Elizabeth A. Lada ◽  
Charles J. Lada
Keyword(s):  
Near Infrared ◽  
Stellar Clusters ◽  
Luminosity Functions

scholarly journals NEAR-INFRARED SPECTRA OF GALACTIC STELLAR CLUSTERS DETECTED ONSPITZER/GLIMPSE IMAGES

2009 ◽  
Vol 697 (1) ◽  
pp. 701-712 ◽  
Author(s):  
Maria Messineo ◽  
Ben Davies ◽  
Valentin D. Ivanov ◽  
Donald F. Figer ◽  
Frederic Schuller ◽  
...  
Keyword(s):  
Infrared Spectra ◽  
Near Infrared ◽  
Stellar Clusters ◽  
Near Infrared Spectra

scholarly journals Comparing ALMA, VLT, and HST data for Massive, Young Clusters in Grand-Design Spirals

2015 ◽  
Vol 12 (S316) ◽  
pp. 141-142
Author(s):  
Preben Grosbøl ◽  
Horacio Dottori
Keyword(s):  
Near Infrared ◽  
Detailed Comparison ◽  
Stellar Clusters ◽  
Giant Molecular Clouds ◽  
Cluster Complexes ◽  
Stellar Cluster ◽  
Grand Design ◽  
Nearby Galaxies ◽  
Massive Clusters ◽  
Co Emission

AbstractA population of young, massive stellar cluster complexes with near-infrared (NIR) colors indicating high extinction (i.e. Av ~ 7m) was identified on HAWK-I/VLT images of several nearby, grand-design spiral galaxies. Models suggest that they are very young cluster complexes still embedded in a dust/gas envelope which will be expelled after 5-7 Myr. This type of very young, embedded clusters are not seen in optical studies using HST data.A detailed comparison of HST and HAWK-I images was done to better understand the discrepancy between the optical and NIR detection of stellar clusters in nearby galaxies. More than 70% of the NIR clusters are located close to dust lanes which would make an optical detection difficult. A comparison of the ALMA CO(1-0)-map of NGC 4321 and the young, massive clusters shows that 60% of them have CO emission within 2“ indicating a correlation between giant molecular clouds and formation of massive clusters.

scholarly journals Radio observations of Galactic Center massive stars

2003 ◽  
Vol 212 ◽  
pp. 497-504
Author(s):  
Cornelia C. Lang
Keyword(s):  
Near Infrared ◽  
Galactic Center ◽  
Stellar Winds ◽  
Radio Sources ◽  
Stellar Clusters ◽  
X Ray ◽  
Spatial Properties ◽  
Gc Clusters ◽  
Infrared Sources ◽  
Massive Clusters

High-resolution multi-frequency observations made with the VLA have revealed the presence of stellar winds in two of the three known massive stellar clusters at the Galactic Center (GC). At a distance of only 8.0 kpc, we are able to resolve radio sources associated with individual near-infrared sources known to be losing mass at high rates. Herein, I discuss the spectral and spatial properties of the radio sources and their near-infrared counterparts, their inferred mass-loss rates, variability and the prospects for detecting stellar winds sources in the Central Cluster, near the supermassive blackhole SgrA*. Such massive clusters as these three GC clusters have a profound impact on the interstellar medium, as evidenced by radio and X-ray observations of the surrounding regions.

scholarly journals Young stellar clusters triggered by a density wave in NGC 2997

2006 ◽  
Vol 2 (S237) ◽  
pp. 417-417
Author(s):  
P. Grosbøl ◽  
H. Dottori ◽  
R. Gredel
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Density Wave ◽  
Star Formation History ◽  
Stellar Clusters ◽  
Star Forming ◽  
Continuous Formation ◽  
Grand Design ◽  
K Band ◽  
Design Spiral

AbstractBright knots along the arms of grand-design spiral galaxies are frequently seen on near-infrared K-band images. To investigate their nature, low resolution K-band spectra of a string of knots in the southern arm of the grand design, spiral galaxy NGC 2997 were obtained with ISAAC/VLT. Most of the knots show strong Brγ emission while some have H2 and HeI emission. A few knots show indications of CO absorption. Their spectra and absolute K magnitudes exceeding -12 mag suggest them to be very compact, young stellar clusters with masses up to 5 × 104 M. The knots' azimuthal distance from the K-band spiral correlates well with their Brγ strength, indicating that they are located inside the co-rotation of the density wave, which triggered them through a large-scale, star-forming front. These relative azimuthal distances suggest an age spread of more than 1.6 Myr, which is incompatible with standard models for an instantaneous star burst. This indicates a more complex star-formation history, such as several bursts or continuous formation.

scholarly journals A near-infrared view of AGB stars in nearby dwarf galaxies

2009 ◽  
Vol 5 (S262) ◽  
pp. 345-346
Author(s):  
M. Gullieuszik ◽  
E. V. Held ◽  
L. Girardi ◽  
L. Rizzi ◽  
P. Marigo ◽  
...  
Keyword(s):  
Near Infrared ◽  
Dwarf Galaxies ◽  
Theoretical Models ◽  
Stellar Populations ◽  
Agb Stars ◽  
Dwarf Spheroidal Galaxies ◽  
Luminosity Functions ◽  
Spheroidal Galaxies

AbstractAs part of our near-infrared photometric survey of nearby dwarf galaxies, we present recent results for Leo I and Leo II dwarf spheroidal galaxies. We selected O- and C-rich AGB stellar populations using two-color diagrams and compared their luminosity functions and star counts with the predictions of the most recent AGB theoretical models.

scholarly journals Erratum: Near-infrared and optical luminosity functions from the 6dF Galaxy Survey

2006 ◽  
Vol 370 (3) ◽  
pp. 1583-1584 ◽  
Author(s):  
D. Heath Jones ◽  
Bruce A. Peterson ◽  
Matthew Colless ◽  
Will Saunders
Keyword(s):  
Near Infrared ◽  
Luminosity Functions

scholarly journals The range of validity of cluster masses and ages derived from broad-band photometry

2009 ◽  
Vol 5 (S266) ◽  
pp. 100-105
Author(s):  
J. Maíz Apellániz
Keyword(s):  
Near Infrared ◽  
Classical Method ◽  
Broad Band ◽  
Mass Function ◽  
Initial Mass Function ◽  
Stellar Clusters ◽  
Stochastic Effects ◽  
Stellar Initial Mass Function ◽  
The Individual ◽  
Wavelength Filters

AbstractI analyze the stochastic effects introduced by sampling the stellar initial mass function (SIMF) in the derivation of the individual masses and the cluster mass function (CMF) from broad-band visible/near-infrared unresolved photometry. The classical method of using unweighted U BV photometry to simultaneously establish ages and extinctions of stellar clusters is found to be unreliable for clusters older than ≈30 Myr, even for relatively large cluster masses. On the other hand, augmenting the filter set to include longer-wavelength filters and using weights for each filter increases the range of masses and ages that can be measured accurately with unresolved photometry. Nevertheless, a relatively large range of masses and ages is found to be dominated by SIMF sampling effects that render the observed masses useless, even when using U BV RI JHK photometry.

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