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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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164 papers · 1 filter
PMAS: The Potsdam Multi Aperture Spectrophotometer. II. The Wide Integral Field Unit PPak
Andreas Kelz, Marc A. W. Verheijen, Martin M. Roth +6
PPak is a new fiber-based Integral Field Unit (IFU), developed at the Astrophysical Institute Potsdam, implemented as a module into the existing PMAS spectrograph. The purpose of P…
Modeling Tidal Streams in evolving dark matter halos
Jorge Penarrubia, Andrew J. Benson, David Martinez-Delgado +1
We explore whether stellar tidal streams can provide information on the secular, cosmological evolution of the Milky Way's gravitational potential and on the presence of subhalos.…
MAMBO 1.2 Millimeter observations of BzK-selected star-forming Galaxies at z~2
H. Dannerbauer, E. Daddi, M. Onodera +9
We present MAMBO 1.2 mm observations of five BzK-pre-selected vigorous starburst galaxies at z~2. Two of these were detected at more than 99.5% confidence levels, with 1.2 mm fluxe…
Two-dimensional models of layered protoplanetary discs - II. The effect of a residual viscosity in the dead zone
R. Wunsch, A. Gawryszczak, H. Klahr +1
We study axisymmetric models of layered protoplanetary discs taking radiative transfer effects into account, and allowing for a residual viscosity in the dead zone. We also explore…
Submillimeter emission from the hot molecular jet HH 211
A. Palau, P. T. P. Ho, Q. Zhang +7
We observed the HH 211 jet in the submillimeter continuum and the CO(3-2) and SiO(8-7) transitions with the Submillimeter Array. The continuum source detected at the center of the…
Multiplicity of very low-mass objects in the Upper Scorpius OB association: a possible wide binary population
H. Bouy, E. L. Martin, W. Brandner +5
We report the initial results of a VLT/NACO high spatial resolution imaging survey for multiple systems among 58 M-type members of the nearby Upper Scorpius OB association. Nine pa…
Detecting Faint Galaxies by Stacking at 24 micron
X. Z. Zheng, E. F. Bell, H. -W. Rix +4
We stack Spitzer 24 micron images for ~7000 galaxies with 0.1<z<1 in the Chandra Deep Field South to probe the thermal dust emission in low-luminosity galaxies over this redshift r…
Multiband photometric detection of a huge flare on the M9 dwarf 2MASSW J1707183+643933
Boris Rockenfeller, Coryn A. L. Bailer-Jones, Reinhard Mundt +1
We present simultaneous UV-G-R-I monitoring of 19 M dwarfs that revealed a huge flare on the M9 dwarf 2MASSW J1707183+643933 with an amplitude in the UV of at least 6 magnitudes. T…
Very Small-Scale Clustering and Merger Rate of Luminous Red Galaxies
Morad Masjedi, David W. Hogg, Richard J. Cool +8
We present the small-scale (0.01<r<8 h^{-1} Mpc) projected correlation function w_p(r_p) and real space correlation function xi(r) of 24520 luminous early-type galaxies from the Sl…
The low-mass pre-main sequence population of the stellar association LH 52 in the Large Magellanic Cloud discovered with Hubble Space Telescope WFPC2 Observations
D. Gouliermis, W. Brandner, Th. Henning
We report on the serendipitous discovery of ~ 500 low-mass candidate PMS stars in the vicinity of the stellar association LH 52 in the Large Magellanic Cloud. We present evidence t…
Cannonballs in the context of Gamma Ray Bursts: Formation sites ?
Jan E. Staff, Christian Fendt, Rachid Ouyed
We investigate possible formation sites of the cannonballs (in the gamma ray bursts context) by calculating their physical parameters, such as density, magnetic field and temperatu…
The design and performance of the Gaia photometric system
C. Jordi, E. Hoeg, A. G. A. Brown +32
The European Gaia astrometry mission is due for launch in 2011. Gaia will rely on the proven principles of ESA's Hipparcos mission to create an all-sky survey of about one billion…
Nature and completeness of galaxies detected in the Two Micron All Sky Survey
Daniel H. McIntosh, Eric F. Bell, Martin D. Weinberg +1
We cross correlate the well-defined and very complete spectroscopic Main Galaxy Sample (MGS) of 156,000 bright (r<17.5 mag) galaxies from the SDSS with 2MASS sources to explore the…
The very low-mass population of the Corona Australis and Chamaeleon II star forming regions
Belén López Martí, Jochen Eislöffel, Reinhard Mundt
We present the results of a deep optical survey in the Corona Australis and Chamaeleon II star forming regions. Our optical photometry is combined with available near- and mid-infr…
Variability and periodicity of field M dwarfs revealed by multichannel monitoring
Boris Rockenfeller, Coryn A. L. Bailer-Jones, Reinhard Mundt
We present simultaneous, multiband monitoring of 19 field M dwarfs (spectral types M2-M9). Significant variability was found in seven objects in at least one out of the three chann…
An Initial Look at the Far Infrared-Radio Correlation within Nearby Star-forming Galaxies using the Spitzer Space Telescope
E. J. Murphy, R. Braun, G. Helou +25
(Abridged) We present an initial look at the far infrared-radio correlation within the star-forming disks of four nearby, nearly face-on galaxies (NGC 2403, NGC 3031, NGC 5194, and…
The Evolution of Rest-Frame K-band Properties of Early-Type Galaxies from z=1 to the Present
A. van der Wel, M. Franx, P. G. van Dokkum +3
We measure the evolution of the rest-frame K-band Fundamental Plane from z=1 to the present by using IRAC imaging of a sample of early-type galaxies in the Chandra Deep Field-South…
The Birth-Cluster of the Galactic Luminous Blue Variable WRA751
A. Pasquali, F. Comeron, A. Nota
We present the results of NTT/VLT UBV imaging of a 260 square arcmin region containing the Galactic Luminous Blue Variable WRA751, in search for its birth-cluster, i.e. a cluster o…
The Onset of Planet Formation in Brown Dwarf Disks
D. Apai, I. Pascucci, J. Bouwman +3
The onset of planet formation in protoplanetary disks is marked by the growth and crystallization of sub-micron-sized dust grains accompanied by dust settling toward the disk mid-p…
Proper motion Pleiades candidate L-type brown dwarfs
G. Bihain, R. Rebolo, V. J. S. Bejar +3
We present results of an optical and near-infrared (IR) 1.8 deg^2 survey in the Pleiades open cluster to search for substellar objects. From optical I-band images from the CFHT and…
Oxygen Gas Abundances at z~1.4: Implications for the Chemical Evolution History of Galaxies
C. Maier, S. J. Lilly, C. M. Carollo +3
The 1<z<2 redshift window hosts the peak of the star formation and metal production rates. Studies of the metal content of the star forming galaxies at these epochs are however spa…
Formation and Evolution of Planetary Systems (FEPS): Primordial Warm Dust Evolution From 3-30 Myr around Sun-like Stars
M. D. Silverstone, M. R. Meyer, E. E. Mamajek +14
We present data obtained with the Infrared Array Camera (IRAC) aboard the Spitzer Space Telescope (Spitzer) for a sample of 74 young (t < 30 Myr old) Sun-like (0.7 < M(star)/M(Sun)…
Bispectrum speckle interferometry of the massive protostellar outflow source IRAS 23151+5912
G. Weigelt, H. Beuther, K. -H. Hofmann +5
We present bispectrum speckle interferometry of the massive protostellar object IRAS 23151+5912 in the near-infrared K' band. The reconstructed image shows the diffuse nebulosity n…
Ultra low-mass star and substellar formation in sigma Orionis
J. A. Caballero
The nearby young sigma Orionis cluster (~360 pc, ~3 Ma) is becoming one of the most important regions for the study of ultra low-mass star formation and its extension down to the m…