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364 papers · 1 filter
Beryllium abundance in turn-off stars of NGC 6752
Luca Pasquini, Piercarlo Bonifacio, Sofia Randich +3
Aims: To measure the beryllium abundance in two TO stars of the Globular Cluster NGC 6752, one oxygen rich and sodium poor, the other presumably oxygen poor and sodium rich. Be abu…
Near-IR integral-field spectroscopy of the companion to GQ Lup
Andreas Seifahrt, Ralph Neuhaeuser, Peter H. Hauschildt +1
The first substellar companion of possibly planetary mass around a normal star, GQ Lup, has been directly imaged (Neuhaeuser et al., 2005). Besides the unknown formation history, t…
Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. V: Final Measurement for Fornax
Slawomir Piatek, Carlton Pryor, Paul Bristow +5
The measured proper motion of Fornax, expressed in the equatorial coordinate system, is mas century. This proper motion is a weighted…
Early-type stars in the core of the young open cluster Westerlund2
G. Rauw, J. Manfroid, E. Gosset +5
Aims. The properties of the early-type stars in the core of the Westerlund2 cluster are examined in order to establish a link between the cluster and the very massive Wolf-Rayet bi…
The Multiwavelength Survey by Yale-Chile (MUSYC): Deep Near-Infrared Imaging and the Selection of Distant Galaxies
Ryan Quadri, Danilo Marchesini, Pieter van Dokkum +18
We present deep near-infrared JHK imaging of four 10'x10' fields. The observations were carried out as part of the Multiwavelength Survey by Yale-Chile (MUSYC) with ISPI on the CTI…
The ACS Survey of Galactic Globular Clusters. I. Overview and Clusters Without Previous HST Photometry
Ata Sarajedini, L. Bedin, B. Chaboyer +10
We present the first results of a large ACS Survey of Galactic globular clusters. This Hubble Space Telescope (HST) Treasury project is designed to obtain photometry with S/N > ~10…
Simultaneous multiwavelength observations of the Low/Hard State of the X-ray transient source SWIFT J1753.5-0127
M. Cadolle Bel, M. Ribo, J. Rodriguez +11
We report the results of simultaneous multiwavelength observations of the X-ray transient source SWIFT J1753.5-0127 performed with INTEGRAL, RXTE, NTT, REM and VLA on 2005 August 1…
Dynamical masses of ultra-compact dwarf galaxies in Fornax
M. Hilker, H. Baumgardt, L. Infante +3
Aims. We determine masses and mass-to-light ratios of five ultra-compact dwarf galaxies and one dwarf elliptical nucleus in the Fornax cluster from high resolution spectroscopy. Me…
Internal Properties of Ultra-Compact Dwarf Galaxies in the Virgo Cluster
E. A. Evstigneeva, M. D. Gregg, M. J. Drinkwater +1
We present new imaging and spectroscopic observations of six ultra-compact dwarf (UCD) galaxies in the Virgo Cluster, along with re-analysed data for five Fornax Cluster UCDs. Thes…
Imaging of star clusters in unperturbed spiral galaxies with the Advanced Camera for Surveys. I. The low luminosity galaxy NGC 45
Marcelo D. Mora, Soeren S. Larsen, Markus Kissler-Patig
We present results from ACS and WFPC observations in the low luminosity galaxy NGC 45. We identified 28 young star cluster candidates. While the exact values of age, mass, and exti…
Spectroscopy of z~6 i-dropout Galaxies: Frequency of Ly-alpha Emission and the Sizes of Ly-alpha Emitting Galaxies
C. C. Dow-Hygelund, B. P. Holden, R. Bouwens +8
We report on deep spectroscopy using LRIS on Keck I and FORS2 on the VLT of a sample of 22 candidate z~6 Lyman Break galaxies (LBGs) selected by the i-z> 1.3 dropout criterion. Red…
A detection of the donor star of Aquila X-1 during its 2004 outburst?
R. Cornelisse, J. Casares, D. Steeghs +4
Phase-resolved high resolution optical spectroscopy has revealed narrow N III and He II emission lines from the soft X-ray transient Aquila X-1 during its 2004 outburst that move a…
The XMM-Newton wide-field survey in the COSMOS field. IV: X-ray spectral properties of Active Galactic Nuclei
V. Mainieri, G. Hasinger, N. Cappelluti +25
We present a detailed spectral analysis of point-like X-ray sources in the XMM-COSMOS field. Our sample of 135 sources only includes those that have more than 100 net counts in the…
The XMM-Newton wide-field survey in the COSMOS field: VI. Statistical properties of clusters of galaxies
A. Finoguenov, L. Guzzo, G. Hasinger +30
We present the results of a search for galaxy clusters in the first 36 XMM-Newton pointings on the COSMOS field. We reach a depth for a total cluster flux in the 0.5-2 keV band of…
A Potential Galaxy Threshing System in the Cosmos Field
S. S. Sasaki, Y. Taniguchi, N. Scoville +26
We report on the discovery of a new potential galaxy threshing system in the COSMOS 2 square degree field using the prime-focus camera, Suprime-Cam, on the 8.2 m Subaru Telescope.…
The XMM-Newton wide-field survey in the COSMOS field: I. Survey description
G. Hasinger, N. Cappelluti, H. Brunner +21
We present the first set of XMM-Newton EPIC observations in the 2 square degree COSMOS field. The strength of the COSMOS project is the unprecedented combination of a large solid a…
The Cosmic Evolution Survey (COSMOS) -- Overview
N. Scoville, H. Aussel, M. Brusa +19
The Cosmic Evolution Survey (COSMOS) is designed to probe the correlated evolution of galaxies, star formation, active galactic nuclei (AGN) and dark matter (DM) with large-scale s…
The Cosmic Evolution Survey (COSMOS): Subaru Observations of the HST COSMOS Field
Y. Taniguchi, N. Scoville, T. Murayama +27
We present deep optical imaging observations of 2 square degree area, covered by the Cosmic Evolution Survey (COSMOS), made by the prime-focus Camera (Supreme-Cam) on the 8.2m Suba…
zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
S. J. Lilly, O. Le Fevre, A. Renzini +42
zCOSMOS is a large redshift survey that is being undertaken in the COSMOS field using 600 hours of observation with the VIMOS spectrograph on the 8-m VLT. The survey is designed to…
Rotation and chemical abundances of Ap/Bp stars in the open cluster NGC 6475
C. P. Folsom, G. A. Wade, S. Bagnulo +1
The connection between age, rotation and chemical abundance of magnetic Ap stars is poorly understood. Using open clusters, we are able to study samples of stars that are both co-e…
Near-IR properties of 24 Globular Clusters in the Galactic Bulge
E. Valenti, F. R. Ferraro, L. Origlia
We present near-IR Color-Magnitude Diagrams and physical parameters for a sample of 24 Galactic Globular Clusters toward the Bulge direction. In this paper we discuss the propertie…
A comparison of density structures of a star forming and a non-star-forming globule. DCld303.8-14.2 and Thumbprint Nebula
J. Kainulainen, K. Lehtinen, P. Vaisanen +2
We present a study of radial density structure of the star forming globule, DCld303.8-14.2 (DC303), and a non-star forming globule, Thumbprint Nebula (TPN), using near-infrared dat…
Black holes: from stars to galaxies
I. F. Mirabel
While until recently they were often considered as exotic objects of dubious existence, in the last decades there have been overwhelming observational evidences for the presence of…
SN 1987A at the end of its second decade
Karina Kjaer, Per Groeningsson, Rubina Kotak +2
After nearly two decades at least five emission mechanisms can be found in SN 1987A. The ejecta continue to glow as a result of the radioactive decay of long-lived nuclei (mostly 4…