14.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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- National Institute for AstrophysicsIT971 papers
93 papers · 1 filter
Evolution of the Ionizing Background and the Epoch of Reionization from the Spectra of z~6 Quasars
Xiaohui Fan, Vijay K. Narayanan, Michael A. Strauss +4
We study the process of cosmic reionization and estimate the ionizing background in the IGM using the Lyman series absorption in the spectra of the four quasars at 5.7<z<6.3 discov…
A 2.4-80 micron spectrophotometric study of SS433 with ISO
Yael Fuchs, Lydie Koch-Miramond, Peter Abraham
We present ISOPHOT spectrophotometric observations of SS433 at four different orbital phases in 1996 and 1997. The HeI+HeII lines in both spectra of SS433 and the Wolf-Rayet star W…
The KPNO International Spectroscopic Survey. III. [O III]-selected Survey List
John J. Salzer, Caryl Gronwall, Vicki L. Sarajedini +8
The KPNO International Spectroscopic Survey (KISS) is an objective-prism survey for extragalactic emission-line objects. It combines many of the features of previous slitless spect…
An HST Census of Nuclear Star Clusters in Late-Type Spiral Galaxies: I. Observations and Image Analysis
Torsten Boeker, Seppo Laine, Roeland P. van der Marel +4
We present new HST I-band images of a sample of 77 nearby, late-type spiral galaxies with low inclination. The main purpose of this catalog is to study the frequency and properties…
Far-Infrared Emission from Intracluster Dust in Abell Clusters
M. Stickel, U. Klaas, D. Lemke +1
The ISOPHOT instrument aboard ISO has been used to observe extended FIR emission of six Abell clusters. The raw profiles of the I_(120 um) / I_(180 um) surface brightness ratio inc…
Spatially resolved imaging spectroscopy of T Tauri
M. E. Kasper, M. Feldt, T. M. Herbst +3
The small separation of the individual stellar components in the TTau system has prevented spectroscopy of the individual components in the near-infrared (NIR) in the past. We pres…
VLT observations of the z=6.28 quasar SDSS 1030+0524
L. Pentericci, X. Fan, H. W. Rix +9
We present new VLT spectroscopic observations of the most distant quasar known, SDSS J1030+0524 at z=6.28 which was recently discovered by the Sloan Digital Sky Survey. We confirm…
NGC 6994 - clearly not a physical stellar ensemble
M. Odenkirchen, C. Soubiran
The sparse stellar ensemble NGC 6994 = M73 has recently been discussed as a possible remnant of an old open cluster. In order to solve the controversy on the nature of this object…
The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
Heidi Jo Newberg, Brian Yanny, Constance M. Rockosi +16
We identify new structures in the halo of the Milky Way Galaxy from positions, colors and magnitudes of five million stars detected in the Sloan Digital Sky Survey. Most of these s…
ISOPHOT - Photometric Calibration of Point Sources
B. Schulz, S. Huth, R. J. Laureijs +14
All observations by the aperture photometer (PHT-P) and the far-infrared (FIR) camera section (PHT-C) of ISOPHOT included reference measurements against stable internal fine calibr…
The Stellar Populations of the Cetus Dwarf Spheroidal Galaxy
A. Sarajedini, E. K. Grebel, A. E. Dolphin +7
We present Hubble Space Telescope Wide Field Planetary Camera 2 photometry in the V and I passbands of the recently discovered Local Group dwarf spheroidal galaxy in Cetus. Our col…
Probing the distribution of dark matter in the Abell 901/902 supercluster with weak lensing
M. E. Gray, A. N. Taylor, K. Meisenheimer +3
We present a weak shear analysis of the Abell 901/902 supercluster, composed of three rich clusters at z=0.16. Using a deep R-band image from the 0.5 x 0.5 degree MPG/ESO Wide Fiel…
Strategies for prompt searches for GRB afterglows: the discovery of the GRB 001011 optical/near-infrared counterpart using colour-colour selection
J. Gorosabel, J. U. Fynbo, J. Hjorth +25
We report the discovery of the optical and near-infrared counterparts to GRB 001011. The GRB 001011 error box determined by Beppo-SAX was simultaneously imaged in the near-infrared…
Far-infrared and molecular line observations of Lynds 183 - studies of cold gas and dust
M. Juvela, K. Mattila, K. Lehtinen +3
We have mapped the dark cloud L183 in the far-infrared at 100um and 200um with the ISOPHOT photometer aboard the ISO satellite. The observations make it possible for the first time…
The X-ray -- radio alignment in the z = 2.2 radio galaxy PKS 1138--262
C. L. Carilli, D. E. Harris, L. Pentericci +4
We present high resolution X-ray observations of the narrow line radio galaxy PKS 1138-262 at z = 2.156 with the ACIS-S detector on the Chandra observatory. These observations show…
Cold dust in late-type Virgo Cluster galaxies
Cristina C. Popescu, Richard J. Tuffs, Heinrich J. Voelk +2
We have statistically analyzed the spatially integrated far-infrared (FIR) emissions of the complete volume- and luminosity-limited sample of late-type (later than S0) Virgo cluste…
Limits on the Mass of the Central Black Hole in 16 Nearby Bulges
Marc Sarzi, Hans-Walter Rix, Joseph C. Shields +6
We report upper limits on the masses of black holes that can be present in the centers of 16 nearby galaxy bulges. These limits for our statistically complete sample were derived f…
The Magellanic Clouds Photometric Survey: The Small Magellanic Cloud Stellar Catalog and Extinction Map
Dennis Zaritsky, Jason Harris, Ian B. Thompson +2
We present our catalog of U, B, V, and I stellar photometry of the central 18 sq. degree area of the Small Magellanic Cloud. We combine our data with the 2MASS and DENIS catalogs t…
The Munich Near-Infrared Cluster Survey (MUNICS) - Number density evolution of massive field galaxies to z ~ 1.2 as derived from the K-band selected survey
N. Drory, R. Bender, J. Snigula +5
We derive the number density evolution of massive field galaxies in the redshift range 0.4 < z < 1.2 using the K-band selected field galaxy sample from the Munich Near-IR Cluster S…
Interstellar Media in the Magellanic Clouds and other Local Group Dwarf Galaxies
Eva K. Grebel
I review the properties of the interstellar medium in the Magellanic Clouds and Local Group dwarf galaxies. The more massive, star-forming galaxies show a complex, multi-phase ISM…
The structure of self-gravitating clouds
Volker Ossenkopf, Ralf Klessen, Fabian Heitsch
To study the interaction of star-formation and turbulent molecular cloud structuring, we analyse numerical models and observations of self-gravitating clouds using the Delta-varian…
Are dwarf spheroidal galaxies dark matter dominated or remnants of disrupted larger satellite galaxies? -- A possible test
Ralf Klessen, HongSheng Zhao
The failure of standard cosmolocical models in accounting for the statistics of dwarf satellites and the rotation curve of gas-rich dwarf galaxies in detail has led us to examine w…
The population of galaxies in the forming cluster around the radio galaxy MRC 1138-262 at z=2.2
L. Pentericci, J. D. Kurk, H. J. A. Rottgering +2
We have recently discovered a forming cluster around the radio galaxy MRC 1138-262 at redshift 2.2. Besides the population of Ly alpha emitting galaxies that have been confirmed sp…
Infrared to millimetre photometry of ultra-luminous IR galaxies: new evidence favouring a 3-stage dust model
U. Klaas, M. Haas, S. A. H. Mueller +7
Infrared to millimetre spectral energy distributions have been obtained for 41 bright ultra-luminous infrared galaxies. The observations were carried out with ISOPHOT between 10 an…