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Pascale Jablonka

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Related publications (140)

Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans

Pierre North, Martin Tafelmeyer, Pascale Jablonka

We present the results of a dedicated search for extremely metal-poor stars in the Fornax, Sculptor, and Sextans dSphs. Five stars were selected from two earlier VLT/Giraffe and HET/HRS surveys and subsequently followed up at high spectroscopic resolution ...

2010

The fundamental plane of EDisCS galaxies The effect of size evolution

Pascale Jablonka

We study the evolution of spectral early-type galaxies in clusters, groups, and the field up to redshift 0.9 using the ESO Distant Cluster Survey (EDisCS) dataset. We measure structural parameters (circularized half-luminosity radii R-e, surface brightness ...

2010

The NIR Ca II triplet at low metallicity Searching for extremely low-metallicity stars in classical dwarf galaxies

Martin Tafelmeyer, Pascale Jablonka

The NIR Ca II triplet absorption lines have proven to be an important tool for quantitative spectroscopy of individual red giant branch stars in the Local Group, providing a better understanding of metallicities of stars in the Milky Way and dwarf galaxies ...

2010

THE REST-FRAME OPTICAL LUMINOSITY FUNCTION OF CLUSTER GALAXIES AT z < 0.8 AND THE ASSEMBLY OF THE CLUSTER RED SEQUENCE

Pascale Jablonka, Anja Von der Linden

We present the rest-frame optical luminosity function (LF) of red-sequence galaxies in 16 clusters at 0.4 < z < 0.8 drawn from the ESO Distant Cluster Survey (EDisCS). We compare our clusters to an analogous sample from the Sloan Digital Sky Survey (SDSS) ...

2009

Evolution of red-sequence cluster galaxies from redshift 0.8 to 0.4: ages, metallicities, and morphologies

Pascale Jablonka

We present a comprehensive analysis of the stellar population properties and morphologies of red-sequence galaxies in 24 clusters and groups from z similar to 0.75 to z similar to 0.45. The dataset, consisting of 215 spectra drawn from the ESO Distant Clus ...

2009

Resolving The Stellar Outskirts Of M81: Evidence For A Faint, Extended Structural Component

Pascale Jablonka

We present a wide field census of resolved stellar populations in the northern half of M81, conducted with Suprime-Cam on the 8 m Subaru telescope and covering an area similar to 0.3 deg(2). The resulting color-magnitude diagram reaches over one magnitude ...

2009

Evolution of the early-type galaxy fraction in clusters since z=0.8

Pascale Jablonka, Anja Von der Linden

We study the morphological content of a large sample of high-redshift clusters to determine its dependence on cluster mass and redshift. Quantitative morphologies are based on PSF-convolved, 2D bulge+disk decompositions of cluster and field galaxies on dee ...

2009

Chemical composition of extremely metal-poor stars in the Sextans dwarf spheroidal galaxy

Martin Tafelmeyer, Pascale Jablonka

Context. Individual stars in dwarf spheroidal galaxies around the Milky Way Galaxy have been studied both photometrically and spectroscopically. Extremely metal-poor stars among them are very valuable because they should record the early enrichment in the ...

2009

THE ENVIRONMENTS OF STARBURST AND POST-STARBURST GALAXIES AT z=0.4-0.8

Pascale Jablonka, Anja Von der Linden

Post-starburst (E+A or k+a) spectra, characterized by their exceptionally strong Balmer lines in absorption and the lack of emission lines, belong to galaxies in which the star formation (SF) activity ended abruptly sometime during the past Gyr. We perform ...

2009

Frequency and properties of bars in cluster and field galaxies at intermediate redshifts

Pascale Jablonka

We present a study of large-scale bars in field and cluster environments out to redshifts of similar to 0.8 using a final sample of 945 moderately inclined disk galaxies drawn from the EDisCS project. We characterize bars and their host galaxies and look f ...

2009

Photometric redshifts and cluster tomography in the ESO Distant Cluster Survey

Pascale Jablonka, Anja Von der Linden

Context. This paper reports the results obtained on the photometric redshifts measurement and accuracy, and cluster tomography in the ESO Distant Cluster Survey (EDisCS) fields. ...

2009

The dynamical and chemical evolution of dwarf spheroidal galaxies

Yves Revaz, Pascale Jablonka

We present a large sample of fully self-consistent hydrodynamical Nbody/Tree-SPH simulations of isolated dwarf spheroidal galaxies (dSphs). It has enabled us to identify the key physical parameters and mechanisms at the origin of the observed variety in th ...

2009

Analysis and calibration of CaII triplet spectroscopy of red giant branch stars from VLT/FLAMES observations

Pascale Jablonka

We demonstrate that low-resolution Ca II triplet (CaT) spectroscopic estimates of the overall metallicity ([Fe/H]) of individual red giant branch (RGB) stars in two nearby dwarf spheroidal galaxies (dSphs) agree to +/- 0.1-0.2 dex with detailed high-resolu ...

Blackwell Publishing Ltd, Oxford2008

Spectroscopy of clusters in the ESO distant cluster survey (EDisCS). II. Redshifts, velocity dispersions, and substructure for clusters in the last 15 fields

Pascale Jablonka, Anja Von der Linden

Aims. We present spectroscopic observations of galaxies in 15 survey fields as part of the ESO Distant Cluster Survey ( EDisCS). We determine the redshifts and velocity dispersions of the galaxy clusters located in these fields, and we test for possible su ...

2008

The relation between star formation, morphology, and local density in high-redshift clusters and groups

Pascale Jablonka, Anja Von der Linden

We investigate how the [O II] properties and the morphologies of galaxies in clusters and groups at z = 0.4-0.8 depend on projected local galaxy density, and compare with the field at similar redshifts and clusters at low z. In both nearby and distant clus ...

2008

The kinematic status and mass content of the sculptor dwarf spheroidal galaxy

Pascale Jablonka

We present VLT FLAMES spectroscopic observations (R similar to 6500) in the Ca II triplet region for 470 probable kinematic members of the Sculptor (Scl) dwarf spheroidal galaxy. The accurate velocities (+/- 2 km s(-1)) and large area coverage of Scl allow ...

2008

Evidence for metallicity spreads in three massive M31 globular clusters

Georges Meylan, Pascale Jablonka

Aims. We quantify the intrinsic width of the red giant branches of three massive globular clusters in M31 in a search for metallicity spreads within these objects. ...

2008

The evolution of the brightest cluster galaxies since z similar to 1 from the ESO Distant Cluster Survey (EDisCS)

Pascale Jablonka, Anja Von der Linden

We present K-band data for the brightest cluster galaxies (BCGs) from the ESO Distant Cluster Survey (EDisCS). These data are combined with the photometry published by Aragon Salamanca, Baugh & Kauffmann and a low-redshift comparison sample built from the ...

Blackwell Publishing Ltd, Oxford2008

The build-up of the colour–magnitude relation in galaxy clusters since z∼ 0.8

Pascale Jablonka, Anja Von der Linden

Oxford, Blackwell Publishing Ltd2007

On-axis spectroscopy of the host galaxies of 20 optically luminous quasars at z ∼ 0.3

Georges Meylan, Frédéric Courbin, Pascale Jablonka

Oxford, Blackwell Publishing Ltd2007

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