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136 papers · 1 filter
On correlations between diffuse interstellar bands
C. Moutou, J. Krelowski, L. d'Hendecourt +1
One way to better apprehend the problem of diffuse interstellar bands (DIBs) is to search for correlations between the bands in a large sample of spectra towards various lines of s…
The Internal Dynamics of Globular Clusters
G. Meylan
Galactic globular clusters are ancient building blocks of our Galaxy. They represent a very interesting family of stellar systems in which some fundamental dynamical processes have…
Eta Carinae: Binarity Confirmed
Augusto Damineli, Andreas Kaufer, Bernhard Wolf +3
We report the recovery of a spectroscopic event in eta Carinae in 1997/98 after a prediction by Damineli (1996). A true periodicity with P = 2020+-5 days (0.2% uncertainty) is obta…
The ROSAT Deep Cluster Survey: Constraints on Cosmology
S. Borgani, P. Rosati, R. Della Ceca +2
We use the ROSAT Deep Cluster Survey (RDCS) to trace the evolution of the cluster abundance out to and constrain cosmological models. We resort to a phenomenological…
Finding typical high redshift galaxies with the NOT
J. U. Fynbo, P. Moller, B. Thomsen
We present results from an ongoing search for galaxy counterparts of a subgroup of Quasar Absorption Line Systems called Damped Ly-alpha Absorbers (DLAs). DLAs have several charact…
A new IR-Array photometric survey of Galactic Globular Clusters: A detailed study of the RGB sequence as a step towards the global testing of stellar models
Francesco R. Ferraro, Paolo Montegriffo, Livia Origlia +1
We present high quality near infrared Color Magnitude Diagrams of 10 Galactic Globular Clusters (GCs) spanning a wide metallicity range (-2.15<[Fe/H]<-0.2). This homogeneous data-b…
Redshift-Distance Survey of Early-type Galaxies. I. Sample Selection, Properties and Completeness
L. N. da Costa, M. Bernardi, M. V. Alonso +5
This is the first in a series of papers describing the recently completed all-sky redshift-distance survey of nearby early-type galaxies (ENEAR) carried out for peculiar velocity a…
The late-type stellar component in the ROSAT All-Sky Survey at high galactic latitude
F. -J. Zickgraf, J. M. Alcala, E. Covino +4
We investigated the properties of the late-type stellar component in the RASS at high-galactic latitude |b| based on an optically identified sample of ROSAT All-Sky Survey (RASS) X…
Building a Sample of Distant Clusters of Galaxies
L. da Costa, M. Scodeggio, L. F. Olsen +1
Candidate clusters of galaxies drawn from the sample identified from the moderately deep I-band data of the ESO Imaging Survey (EIS), have been used for follow-up optical/infrared…
Tidal Tails around 20 Galactic Globular Clusters
Georges Meylan, Stephane Leon, Francoise Combes
We present our study of the 2-D structures of the tidal tails associated with 20 galactic globular clusters, structures obtained by using the wavelet transform to detect weak struc…
The thermal history of the intergalactic medium
Joop Schaye, Tom Theuns, Michael Rauch +2
At redshifts z >~ 2, most of the baryons reside in the smooth intergalactic medium which is responsible for the low column density Lyman-alpha forest. This photoheated gas follows…
Detecting the Gravitational Redshift of Cluster Gas
Tom Broadhurst, Evan Scannapieco
We examine the gravitational redshift of radiation emitted from within the potential of a cluster. Spectral lines from the intracluster medium (ICM) are redshifted in proportion to…
Redshift-Distance Survey of Early-Type Galaxies. IV. Dipoles of the Velocity Field
L. N. da Costa, M. Bernardi, M. V. Alonso +5
We use the recently completed redshift-distance survey of nearby early-type galaxies (ENEAR) to measure the dipole component of the peculiar velocity field to a depth of cz ~ 6000…
The Low End of the Initial Mass Function in Young LMC Clusters: I. The Case of R136
Marco Sirianni, Antonella Nota, Claus Leitherer +2
We report the result of a study in which we have used very deep broadband V and I WFPC2 images of the R136 cluster in the Large Magellanic Cloud from the HST archive, to sample the…
On the Globular Cluster IMF below 1 Solar Mass
Francesco Paresce, Guido De Marchi
(Abridged) Accurate luminosity functions (LF) for a dozen globular clusters have now been measured at or just beyond their half-light radius using HST. They span almost the entire…
The redshift-space two-point correlation function of galaxy groups in the CfA2 and SSRS2 surveys
M. Girardi, W. Boschin, L. da Costa +1
We measure the two-point redshift-space correlation function of loose groups of galaxies, xi_GG, for the combined CfA2 and SSRS2 surveys. Our combined group catalog constitutes the…
The ROSAT Deep Survey: III. Optical spectral properties of X-ray sources in the Lockman Hole
I. Lehmann, G. Hasinger, M. Schmidt +6
The ROSAT Deep Survey in the Lockman Hole contains a complete sample of 50 X-ray sources with fluxes in the 0.5-2.0 keV band larger than 5.5E-15 erg/cm2/s. Previous work has provid…
1.65 micrometers (H-band) surface photometry of galaxies. III: observations of 558 galaxies with the TIRGO 1.5m telescope
G. Gavazzi, P. Franzetti, M. Scodeggio +5
We present near-infrared H-band (1.65 micron) surface photometry of 558 galaxies in the Coma Supercluster and in the Virgo cluster. This data set, obtained with the Arcetri NICMOS3…
1.65 micrometers (H-band) surface photometry of galaxies. IV:observations of 170 galaxies with the Calar Alto 2.2m telescope
A. Boselli, G. Gavazzi, P. Franzetti +2
We present near-infrared (H band) surface photometry of 170 galaxies, obtained in 1997 using the Calar Alto 2.2m telescope equipped with the NICMOS3 camera MAGIC. The majority of o…
Extragalactic large-scale structures behind the southern Milky Way. - III. Redshifts obtained at the SAAO in the Great Attractor region
Patrick A. Woudt, Renee C. Kraan-Korteweg, Anthony P. Fairall
(abbreviated) In the third of a series of papers on large-scale structures behind the southern Milky Way, we report here on redshifts obtained at the South African Astronomical Obs…
On the ionizing continuum in active galactic nuclei: clues from ISO
M. Almudena Prieto, Sueli M. Viegas
The ISO coronal line spectrum of the brightest Seyfert galaxies from the CfA sample is presented and modeled. ISO observations of [O IV] 25.9 , [Ne V] 14.3 , [Mg VIII] 3.02 $…
The Observed Probability Distribution Function, Power Spectrum, and Correlation Function of the Transmitted Flux in the Lyman-alpha Forest
Patrick McDonald, Jordi Miralda-Escude, Michael Rauch +4
A sample of eight quasars observed at high resolution and signal-to-noise is used to determine the probability distribution function (PDF), the power spectrum, and the correlation…
Ly-alpha Emission from a Lyman Limit Absorber at z=3.036
J. U. Fynbo, B. Thomsen, P. Moller
Deep, 17.8 hours, narrow band imaging obtained at the ESO 3.5m New Technology Telescope has revealed extended (galaxy sized) Ly-alpha emission from a high redshift Lyman limit abso…
Rayleigh scattering and laser spot elongation problems at ALFA
E. Viard, F. Delplancke, N. Hubin +2
This paper describes the qualitative effects of LGS spot elongation and Rayleigh scattering on ALFA wavefront sensor images. An analytical model of Rayleigh scattering and a numeri…