The mean ages of S0 disks - Evidence for star formation 5 gigayears ago

Bothun, G. D.; Gregg, Michael D.

doi:10.1086/168361

Cited by 71 publications

(72 citation statements)

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“…2. The host galaxy in all PRGs of the sample, but AM 2020-504, has overall bluer B − H colors than the average values observed in early-type galaxies (Bothun & Gregg 1990); on average, they are very similar to those of spirals (by Bothun et al 1984). We can then expect a younger age for the central component of PRGs than those predicted for early-type systems.…”

Section: Nir Colorsmentioning

confidence: 65%

“…We select a sample of S0 and spiral galaxies for the comparison. The sample of earlytype galaxies were studied by Bothun and Gregg (in 1990). The structural parameters for these objects where obtained by fitting the light distribution with the super-position of a de Vaucouleurs law (n = 4) and an exponential disk, for the bulge and disk component respectively, in the B band.…”

Section: Study Of the Host Galaxy Light Distributionmentioning

confidence: 99%

“…The structural parameters for these objects where obtained by fitting the light distribution with the super-position of a de Vaucouleurs law (n = 4) and an exponential disk, for the bulge and disk component respectively, in the B band. The surface brightness parameters in the K band are derived by considering the average B − K color of these objects (Bothun & Gregg 1990). The sample of spiral galaxies include objects studied by Möllenhoff & Heidt (2001) and by .…”

Section: Study Of the Host Galaxy Light Distributionmentioning

confidence: 99%

“…Light dotted and light dashed lines indicate loci of constant age for the different models; different ages are reported on the plot. Open circles and asterisks correspond to bulges and disks respectively from a sample of S0 galaxies (Bothun & Gregg 1990). …”

Section: Bulge Scale Parameters: Log N-log R E Planementioning

confidence: 99%

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Near-Infrared photometry in $\vec{J}$ $\vec{H}$ and $\vec{Kn}$ bands for polar ring galaxies

Iodice

Arnaboldi

Sparke³

et al. 2002

A&A

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Abstract.We discuss the properties of the host galaxy and ring light distributions in the optical and near infrared bands for a sample of Polar Ring Galaxies (PRGs), presented in Paper I (Iodice et al. 2002b). The goal of this work is to test different formation scenarios for PRGs, proposed by different authors in the last decades, by comparing their predictions with these new data. The strategy is twofold: i) the integrated colors of the main components in these systems are compared with those of standard morphological galaxy types, to investigate whether differences in colors are caused by dust absorption or difference in stellar populations. We then derived an estimate of the stellar population ages in PRGs, which can be used to set constrains on the dynamical modeling and the time evolution of these systems; ii) we analyse the structural parameters of the host galaxy in order to understand whether this component is a standard early-type system as its morphology suggests, and the light distribution in the polar ring to measure its radial extension. These observational results indicate that the global properties of PRGs are better explained by dissipative merging of disks with un-equal masses as proposed by Bekki (1998), rather than the accretion-or stripping-of gas by a pre-existing early-type galaxy.

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Section: Nir Colorsmentioning

confidence: 65%

Section: Study Of the Host Galaxy Light Distributionmentioning

confidence: 99%

Section: Study Of the Host Galaxy Light Distributionmentioning

confidence: 99%

Section: Bulge Scale Parameters: Log N-log R E Planementioning

confidence: 99%

See 2 more Smart Citations

Near-Infrared photometry in $\vec{J}$ $\vec{H}$ and $\vec{Kn}$ bands for polar ring galaxies

Iodice

Arnaboldi

Sparke³

et al. 2002

A&A

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“…The Bulge-to-Disk (B/D) ratio obtained for ESO 235-G58 (B/D = 0.7), shown in Fig. 15 (left panel), Iodice et al (2002b), for early-type galaxies (continuous line), by Bothun & Gregg (1990), and for spiral galaxies (dashed line), by Möllenhoff & Heidt (2001); Khosroshahi et al (2000). The dotted line indicates the value of B/D derived for ESO 235-G58 (Table 5).…”

Section: Parametermentioning

confidence: 99%

Photometric structure of the peculiar galaxy ESO 235-G58

Iodice

Arnaboldi

Sparke³

et al. 2004

A&A

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Abstract. We present the near-infrared and optical properties of the peculiar galaxy ESO 235-G58, which resembles a late-type ringed barred spiral seen close to face-on. However, the apparent bar of ESO 235-G58 is in reality an edge-on disk galaxy of relatively low luminosity. We have analyzed the light and color distributions of ESO 235-G58 in the NIR and optical bands and compared them with the typical properties observed for other morphological galaxy types, including polar ring galaxies. Similar properties are observed for ESO 235-G58, polar ring galaxies, and spiral galaxies, which leads us to conclude that this peculiar system is a polar-ring-related galaxy, characterized by a low inclined ring/disk structure, as pointed out by Buta & Crocker in an earlier study, rather than a barred galaxy.

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On the Origin of S0 Galaxies

Alvensleben

2004

Astrophysics and Space Science Library

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I will review the basic properties of S0 galaxies in the local Universe in relation to both elliptical and spiral galaxies, their neighbours on the Hubble sequence, and also in relation to dwarf spheroidal (dSph) galaxies. This will include colours, luminosities, spectral features, information about the age and metallicity composition of their stellar populations and globular clusters, about their ISM content, as well as kinematic signatures and their implications for central black hole masses and past interaction events, and the number ratios of S0s to other galaxy types in relation to environmental galaxy density. I will point out some caveats as to their morphological discrimination against other classes of galaxies, discuss the role of dust and the wavelength dependence of bulge/disk light ratios. These effects are of importance for investigations into the redshift evolution of S0 galaxies -both as individual objects and as a population. The various formation and transformation scenarios for S0 and dSph galaxies will be presented and confronted with the available observations.

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The mean ages of S0 disks - Evidence for star formation 5 gigayears ago

Cited by 71 publications

References 0 publications

Near-Infrared photometry in $\vec{J}$ $\vec{H}$ and $\vec{Kn}$ bands for polar ring galaxies

Near-Infrared photometry in $\vec{J}$ $\vec{H}$ and $\vec{Kn}$ bands for polar ring galaxies

Photometric structure of the peculiar galaxy ESO 235-G58

On the Origin of S0 Galaxies

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