نتایج جستجو برای: galaxies stellar content
تعداد نتایج: 532426 فیلتر نتایج به سال:
Aims. The aim is to study the stellar content of the bar region to constrain its formation and evolution. Methods. Line-strength indices in the bar region of a sample of 6 barred galaxies were employed to derive age and metallicity gradients along the bars using stellar population models. Results. We find clear radial gradients in the line-strength indices for all the galaxies. We find positive...
We discuss the nature of faint 6.7μm galaxies detected with the mid-infrared camera ISOCAM on board the Infrared Space Observatory (ISO). The 23hour integration on the Hawaii Deep Field SSA13 has provided a sample of 65 sources down to 6μJy at 6.7μm. For 57 sources, optical or near-infrared counterparts were found with a statistical method. All four Chandra sources, three SCUBA sources, and one...
We present our catalog of U , B, V , and I stellar photometry of the central 64 deg area of the Large Magellanic Cloud. Internal and external astrometric and photometric tests using existing optical photometry (U , B, and V from Massey’s bright star catalog and I from the near-infrared sky survey DENIS) are used to confirm our observational uncertainty estimates. We fit stellar atmosphere model...
We present the integrated properties of the stellar populations in the Universidad Complutense de Madrid (UCM) Survey galaxies. Applying the techniques described in the first paper of this series, we derive ages, burst masses and metallicities of the newly-formed stars in our sample galaxies. The population of young stars is responsible for the Hα emission used to detect the objects in the UCM ...
We present the integrated properties of the stellar populations in the Universidad Complutense de Madrid (UCM) Survey galaxies. Applying the techniques described in the first paper of this series, we derive ages, burst masses and metallicities of the newly-formed stars in our sample galaxies. The population of young stars is responsible for the Hα emission used to detect the objects in the UCM ...
We present UBV I CCD photometry of the stellar contents and globular cluster(GC) candidates in the spiral galaxy NGC 300 in the Sculptor group. Color-magnitude diagrams for 18 OB associations having more than 30 member stars are presented. The slope of the initial mass function for the bright stars in NGC 300 is estimated to be Γ = −2.6±0.3. Assuming the distance to NGC 300 of (m−M)0 = 26.53± 0...
We present UBV I CCD photometry of the stellar contents and globular cluster(GC) candidates in the spiral galaxy NGC 300 in the Sculptor group. Color-magnitude diagrams for 18 OB associations having more than 30 member stars are presented. The slope of the initial mass function for the bright stars in NGC 300 is estimated to be Γ = −2.6±0.3. Assuming the distance to NGC 300 of (m−M)0 = 26.53± 0...
We present the integrated properties of the stellar populations in the Universidad Complutense de Madrid (UCM) Survey galaxies. Applying the techniques described in the first paper of this series, we derive ages, burst masses and metallicities of the newly-formed stars in our sample galaxies. The population of young stars is responsible for the Hα emission used to detect the objects in the UCM ...
We present the stellar population content of early-type galaxies from the ATLAS3D survey. Using spectra integrated within apertures covering up to one effective radius, we apply two methods: one based on measuring line-strength indices and applying single stellar population (SSP) models to derive SSP-equivalent values of stellar age, metallicity, and alpha enhancement; and one based on spectral...
We present the stellar population content of early-type galaxies from the ATLAS survey. Using spectra integrated within apertures covering up to one effective radius, we apply two methods: one based on measuring line-strength indices and applying single stellar population (SSP) models to derive SSP-equivalent values of stellar age, metallicity, and alpha enhancement; and one based on spectral f...
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