The age of blue LSB galaxies - Astronomy & Astrophysics
these systems may be younger than their high surface brightness ... wide range for the ages of blue LSB galaxies: from 1–2 Gyr ... 2001). The comparison of measured spectral energy distri- ... In high surface brightness (HSB) galaxies, mixing of heavy el- ... whether these radial abundance fluctuations can be used to con-.
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Stellar Populations and the Star Formation Histories of LSB Galaxies
Jul 25, 2014 ... population, one where all the stars are a single age and chemical ... A dilemma is posed by LSB galaxies, for their gas fractions are high, .... This increases the amount of mixing and results in fewer metal-poor stars. ..... As Hα emission is a measure of the SFR over short timescales, we can alter the constant.
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Galactic Chemical Evolution - Astronomy Program
Models for the chemical evolution of galaxies need to account for the ... sequent release of metal-enriched gas as stars lose mass and die. .... but their kinematics, chemical abundances, and ages. A ... 4 A generic comparison of massive star yields can be found in Gibson, ..... be measured (e.g. Wyse & Gilmore 1988).
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astro-ph/9311003 PDF - arXiv.org
with a young mean age stemming from late formation and subsequent slow evolution. .... of enough calibration data to accurately measure the extinction coe cients ... diameter will obviously be less for the lower surface brightness disk simply ..... One possible reason for the blue colors of LSB galaxies is that their IMF is ...
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Low-Surface-Brightness Galaxies: Hidden Galaxies Revealed - JStor
In 20 years, low-surface-brightness (LSB) galaxies have evolved from being an ... surveys have uncovered a population of red LSB disks that may be related to the excess of faint blue ..... 1). In principle, the surface-brightness profiles of galaxies can be traced to ... There are three conceivable ways of measuring the surface.
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The VRI colours of HII galaxies
Oct 17, 1996 ... To infer ages and mix of stellar populations of HII galaxies through broad band ob- servations one can compare the observed colours with ...
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Hidden Galaxies Revealed
Feb 18, 1997 ... LSB galaxies have a number of remarkable properties which ... condition one can easily conceive of observing environments that would ... brightness of the galactic disk is ∼ 24 mag arcsec−2 in the blue .... There are three conceivable ways of measuring the surface ..... star formation and metal production.
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Element Abundances in Nearby Galaxies
Nov 7, 2002 ... The measurement of element abundances in galaxies other than ... tions depend on both age and metallicity; metallicity measurements thus reduce degen ... nated by metals (ions of metals in X-ray and ionized gas, ... One can think of an H II region as an efficient machine for converting the ...... LSB galaxies.
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What will blue compact dwarf galaxies evolve into? - ARI
Nov 14, 2013 ... and that of their underlying low surface brightness (LSB) host. The latter ... luminosity-weighted stellar ages among galaxies in clusters, re- sulting in red colours. ... prise star-forming dwarf galaxies such as blue compact dwarfs .... 2 Note: The LSB-component of BCDs should not be mixed up with the galaxy ...
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An Optical and Infrared Analysis of Blue Compact Dwarf Galaxies
This thesis presents an investigation into their physical conditions, kinematics, chemical abundances ... List of Tables xx. 1 Introduction. 1. 1.1 What are blue compact dwarf galaxies? ... 1.4 What can emission lines tell us about BCDs? ..... 2.12 EW(Hβ) as a function of age, as predicted by the STARBURST99 code for metal-.
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here - NED
tions depend on both age and metallicity; metallicity measurements thus reduce ... nated by metals (ions of metals in X-ray and ionized gas, singly-ionized ... One can think of an H II region as an efficient machine for converting the ... of PNs offer a means of measuring abundances across galaxies and their ...... LSB galaxies.
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HST observations of the cometary blue compact dwarf galaxy UGC
Nov 15, 2001 ... measured magnitude I = 23.65 ± 0.10 mag of the red giant branch tip results in ... –2.4 like the most metal-deficient globular clusters) and an old age of 10 Gyr, or ... The dwarf irregular galaxy UGC 4483 can also be classified as a cometary ... the “head” of the comet while its low-surface-brightness (LSB) ...
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The red halos of SDSS low surface brightness disk galaxies
measurement of surface brightness, since it is sensitive both ... which requires that the sky flux can be subtracted with ex- ... tures in the halo of the galaxy that, when mixed with scat- .... 1. They show that there is a large difference in age of the stellar population ... blue LSB galaxies due to a larger fraction of star forming.
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Galaxy Structure, Dark Matter, and Galaxy Formation
Oct 1, 1996 ... ing highlights and discuss their implications for the structure and formation of .... These blue galaxies must have been either more luminous or more numer- ... Metals in the Lyman-alpha Forest – The traditional view of quasar ab- .... vide a theoretical framework within which one can quickly assess the effect.
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What will blue compact dwarf galaxies evolve into?
Nov 15, 2013 ... and that of their underlying low surface brightness (LSB) host. The latter ... luminosity-weighted stellar ages among galaxies in clusters, re- sulting in red ... galaxies into ETGs as one approaches the cluster center, and iii) .... 2 Note: The LSB-component of BCDs should not be mixed up with the galaxy type ...
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Proposal - Canada France Hawaii Telescope
Feb 28, 2012 ... formation of galaxies from the blue cloud to the red se- quence (through the ... very low surface brightness, which will fade with age, or may be ...
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The Star Formation History of Low Surface Brightness Galaxies
star formation rate, suggesting that the mean age of their stellar population is relatively ... function of time, perhaps due in part to the slow build up of metals and dust. ... one made my life easier than Woong-Tae Kim and Jong-Won Kim. As a ..... subject and measured oxygen abundances in 22 LSB disk galaxies using optical.
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The Genesis of the Milky Way's Thick Disk via Stellar Migration
Oct 1, 2010 ... stars are older and metal poor relative to their thin .... radial mixing for stellar populations for a variety of stel- ... nor can this scenario explain thick disks in all galaxies. However .... Figure 1. Star particles that fall within the solar cylinder at the ... R ≤ 9 kpc while in the LSB simulation it corresponds to 11 kpc.
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On the age of the nearby blue compact dwarf galaxy SBS 0335-052
On the age of the nearby blue compact dwarf galaxy SBS 0335-052 ... can significantly influence the observed colour distribution of ... presently undergoing one of their very first bursts of star for- ... imaging shows the extended underlying LSB component of the ... Analyzing the stellar metal absorption lines in the UV spec-.
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The ATLAS3D project – XXIX. The new look of early-type galaxies
Oct 27, 2015 ... trace the present and past mass assembly of ETGs are one of the prime goals of the project. .... ages, i.e. images in which the galaxy has been modelled and sub- tracted. .... case, there will be a slight overcorrection of the background, leaving ... tidal tails formed in major mergers, composed of mixed, metal-.
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