scholarly journals On the Nature of Dwarf Galaxies in the Interacting Group HCG 31

2004 ◽  
Vol 217 ◽  
pp. 568-569
Author(s):  
Ángel R. López-Sánchez ◽  
César Esteban ◽  
Mónica Rodríguez
Keyword(s):  
Chemical Composition ◽  
Compact Group ◽  
Dwarf Galaxies ◽  
Ionized Gas ◽  
Origin And Evolution ◽  
Global View

We have analysed the morphology, kinematics, colors and chemical composition of the ionized gas of the different objects belonging to the interacting compact group HCG 31 in order to get a global view of the origin and evolution of the dwarf galaxies present in it.

scholarly journals Ionized gas in dwarf galaxies: Abundance indicators

2008 ◽  
Vol 4 (S255) ◽  
pp. 375-380 ◽  
Author(s):  
Grażyna Stasińska
Keyword(s):  
Chemical Composition ◽  
Unsolved Problem ◽  
Dwarf Galaxies ◽  
Temperature Fluctuations ◽  
Hii Regions ◽  
Ionized Gas ◽  
Hii Region

AbstractWe discuss the four basic methods to derive HII region abundances in metal-poor galaxies by presenting a few recent results obtained with these methods. We end up by commenting on the yet unsolved problem of temperature fluctuations in HII regions, which may plague abundance determinations, as well as the discrepancy between abundances derived from recombination lines and collisionally excited lines, to which inhomogeneous chemical composition might be the explanation.

scholarly journals The ionized gas in and around the Wolf-Rayet galaxy NGC 1741

2003 ◽  
Vol 212 ◽  
pp. 728-729
Author(s):  
Ángel R. López-Sánchez ◽  
César Esteban ◽  
Mónica Rodríguez
Keyword(s):  
Star Formation ◽  
Chemical Composition ◽  
Compact Group ◽  
Main Mechanism ◽  
Ionized Gas ◽  
Physical Conditions

Interaction can be the main mechanism that triggers star formation in Wolf-Rayet galaxies. The compact group HCG 31 has one of this objects, NGC 1741. We present new observations of this compact interacting group, in order to analyse the physical conditions and chemical composition of the ionized gas, as well as to estimate the ages of the starbursts.

scholarly journals Is there any pristine gas in nearby starburst galaxies?

2008 ◽  
Vol 4 (S255) ◽  
pp. 278-282
Author(s):  
Vianney Lebouteiller ◽  
Daniel Kunth
Keyword(s):  
Chemical Composition ◽  
Starburst Galaxies ◽  
Lower Threshold ◽  
Ionized Gas ◽  
Neutral Gas

AbstractWe derive the chemical composition of the neutral gas in the blue compact dwarf (BCD) Pox 36 observed with FUSE. Metals (N, O, Ar, and Fe) are underabundant as compared to the ionized gas associated with H ii regions by a factor ~7. The neutral gas, although it is not pristine, is thus probably less chemically evolved than the ionized gas. This could be due to different dispersal and mixing timescales. Results are compared to those of other BCDs observed with FUSE. The metallicity of the neutral gas in BCDs seems to reach a lower threshold of ~1/50 Z⊙ for extremely-metal poor galaxies.

scholarly journals Chemical composition and constraints on mass loss for globular clusters in dwarf galaxies: WLM and IKN

2014 ◽  
Vol 565 ◽  
pp. A98 ◽  
Author(s):  
Søren S. Larsen ◽  
Jean P. Brodie ◽  
Duncan A. Forbes ◽  
Jay Strader
Keyword(s):  
Chemical Composition ◽  
Mass Loss ◽  
Globular Clusters ◽  
Dwarf Galaxies

scholarly journals The Interstellar Medium of Dwarf Galaxies

Galaxies ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 11
Author(s):  
Christian Henkel ◽  
Leslie K. Hunt ◽  
Yuri I. Izotov
Keyword(s):  
Interstellar Medium ◽  
Dwarf Galaxies ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Ionized Gas ◽  
Green Pea ◽  
Physical And Chemical ◽  
The Impact ◽  
The Universe ◽  
And Chemical Properties

Dwarf galaxies are by far the most numerous galaxies in the Universe, showing properties that are quite different from those of their larger and more luminous cousins. This review focuses on the physical and chemical properties of the interstellar medium of those dwarfs that are known to host significant amounts of gas and dust. The neutral and ionized gas components and the impact of the dust will be discussed, as well as first indications for the existence of active nuclei in these sources. Cosmological implications are also addressed, considering the primordial helium abundance and the similarity of local Green Pea galaxies with young, sometimes protogalactic sources in the early Universe.

scholarly journals A kinematic study of the neutral and ionized gas in the irregular dwarf galaxies IC 4662 and NGC 5408★

2010 ◽  
Vol 407 (1) ◽  
pp. 113-132 ◽  
Author(s):  
Janine Van Eymeren ◽  
Bärbel S. Koribalski ◽  
Ángel R. López-Sánchez ◽  
Ralf-Jürgen Dettmar ◽  
Dominik J. Bomans
Keyword(s):  
Dwarf Galaxies ◽  
Ionized Gas ◽  
Kinematic Study

Chemical composition of globular clusters in dwarf galaxies

2019 ◽  
Vol 14 (S351) ◽  
pp. 317-320
Author(s):  
Søren S. Larsen
Keyword(s):  
Chemical Composition ◽  
Globular Clusters ◽  
Milky Way ◽  
Local Group ◽  
Dwarf Galaxies ◽  
Chemical Abundances ◽  
Preliminary Results ◽  
Detailed Chemical

AbstractThis contribution gives an update on on-going efforts to characterise the detailed chemical abundances of Local Group globular clusters (GCs) from integrated-light spectroscopy. Observations of a sample of 20 GCs so far, located primarily within dwarf galaxies, show that at low metallicities the [α/Fe] ratios are generally indistinguishable from those in Milky Way GCs. However, the “knee” above which [α/Fe] decreases towards Solar-scaled values occurs at lower metallicities in the dwarfs, implying that GCs follow the same trends seen in field stars. Efforts are underway to establish NLTE corrections for integrated-light abundance measurements, and preliminary results for Mn are discussed.

scholarly journals Modeling and analysis of medium-resolution integrated-light spectra of globular clusters in dwarf galaxies

2019 ◽  
Vol 14 (S351) ◽  
pp. 165-169
Author(s):  
Margarita E. Sharina ◽  
Vladislav V. Shimansky
Keyword(s):  
Chemical Composition ◽  
Globular Clusters ◽  
Dwarf Galaxies ◽  
Synthesis Method ◽  
Host Galaxies ◽  
Modeling And Analysis ◽  
Physical Conditions ◽  
Light Spectra ◽  
Medium Resolution ◽  
Key Points

AbstractThe study of ages, helium mass fraction (Y) and chemical composition of globular clusters in dwarf galaxies is important for understanding the physical conditions at the main evolutionary stages of the host galaxies and for constraining the build-up histories of large galaxies. We present the analysis of integrated-light spectra of 8 extragalactic and 20 Galactic globular clusters (GCs) using our population synthesis method. We calculate synthetic spectra of GCs according to the defined stellar mass functions using model atmospheres and stellar parameters ([Fe/H], Teff, and logg) set by theoretical isochrones. The main advantage of our method is the ability to determine not only chemical composition but also the age and mean Y in a cluster by modelling and analysis of Balmer absorption lines. The knowledge of Y and anomalies of light elements in star clusters is one of the key points for understanding the phenomenon of multiple stellar populations.

Candidate Tidal Dwarf Galaxies in the Compact Group CG J1720−67.8

2003 ◽  
Vol 587 (2) ◽  
pp. 660-671 ◽  
Author(s):  
S. Temporin ◽  
R. Weinberger ◽  
G. Galaz ◽  
F. Kerber
Keyword(s):  
Compact Group ◽  
Dwarf Galaxies
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