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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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62 papers · 2 filters
The 2dF Galaxy Redshift Survey: Wiener Reconstruction of the Cosmic Web
Pirin Erdogdu, Ofer Lahav, Saleem Zaroubi +27
We reconstruct the underlying density field of the 2 degree Field Galaxy Redshift Survey (2dFGRS) for the redshift range 0.035<z<0.200 using the Wiener Filtering method. The Wiener…
ISO observations of four active galaxies
Michel Dennefeld, Thomas Boller, Dimitra Rigopoulou +1
We present ISO PHOT-S spectra of four galaxies known or suspected to host a central AGN, selected from the initial Iras/Rosat sample of Boller et al. (1992). Two of them had no obv…
The detailed optical light curve of GRB 030329
Y. M. Lipkin, E. O. Ofek, A. Gal-Yam +22
(Abridged) We present densely sampled BVRI light curves of the optical transient associated with the gamma-ray burst GRB 030329, the result of a coordinated observing campaign cond…
Toward a detailed view on the kinematics of intermediate luminosity early-type galaxies no dark matter candidates
G. Covone, N. R. Napolitano
In several nearby intermediate luminosity early-type galaxies, recent observations at large radii have shown a indications of a lack of dark matter, substantially at odds with the…
A hierarchy of voids: Much ado about nothing
Ravi K. Sheth, Rien van de Weygaert
We present a model for the distribution of void sizes and its evolution in the context of hierarchical scenarios of gravitational structure formation. We find that at any cosmic ep…
OASIS High-Resolution Integral Field Spectroscopy of the SAURON Ellipticals and Lenticulars
R. McDermid, E. Emsellem, M. Cappellari +12
We present a summary of high-spatial resolution follow-up observations of the elliptical (E) and lenticular (S0) galaxies in the SAURON survey using the OASIS integral field spectr…
Tracing the Star Stream Through M31 Using Planetary Nebula Kinematics
H. R. Merrett, K. Kuijken, M. R. Merrifield +12
We present a possible orbit for the Southern Stream of stars in M31, which connects it to the Northern Spur. Support for this model comes from the dynamics of planetary nebulae (PN…
A SAURON look at galaxy bulges
J. Falcón-Barroso, R. Bacon, M. Bureau +8
Kinematic and population studies show that bulges are generally rotationally flattened systems similar to low-luminosity ellipticals. However, observations with state-of-the-art in…
HI absorption in a gravitational lens at
N. Kanekar, F. H. Briggs
We have used the Westerbork Synthesis Radio Telescope to detect HI 21cm absorption at in the gravitational lens system towards PMN J0134-0931. The 21cm profile has…
Void Hierarchy and Cosmic Structure
Rien van de Weygaert, Ravi Sheth
Within the context of hierarchical scenarios of gravitational structure formation we describe how an evolving hierarchy of voids evolves on the basis of {\em two} processes, the {\…
Holes and high velocity HI in NGC 6946
Rense Boomsma, Tom Oosterloo, Thijs van der Hulst +2
We are studying the properties of the holes and the high velocity gas in NGC 6946. Here we present some puzzling results.
Constraining the variation of fundamental constants using 18cm OH lines
Jayaram N. Chengalur, Nissim Kanekar
We describe a new technique to estimate variations in the fundamental constants using 18cm OH absorption lines. This has the advantage that all lines arise in the same species, all…
Detection of OH and wide HI absorption toward B0218+357
N. Kanekar, J. N. Chengalur, A. G. de Bruyn +1
We present deep GMRT OH and WSRT HI absorption spectra of the gravitational lens toward B0218+357. Both the 1665 MHz and 1667 MHz OH lines are clearly detected for the…
Mid-infrared spectral evidence for a luminous dust enshrouded source in Arp220
H. W. W. Spoon, A. F. M. Moorwood, D. Lutz +3
We have re-analyzed the 6-12 micron ISO spectrum of the ultra-luminous infrared galaxy Arp220 with the conclusion that it is not consistent with that of a scaled up version of a ty…
Redshift estimation of clusters by wavelet decomposition of their Sunyaev-Zel'dovich morphology
Bjoern Malte Schaefer, Christoph Pfrommer, Saleem Zaroubi
A method for estimating redshifts of galaxy clusters based solely on resolved Sunyaev-Zel'dovich (SZ) images is proposed. Given a high resolution SZ cluster image (with FWHM of app…
Isocurvature Fluctuations Induce Early Star Formation
Naoshi Sugiyama, Saleem Zaroubi, Joseph Silk
The early reionisation of the Universe inferred from the WMAP polarisation results, if confirmed, poses a problem for the hypothesis that scale-invariant adiabatic density fluctuat…
Mid-infrared emission of galactic nuclei: TIMMI2 versus ISO observations and models
R. Siebenmorgen, E. Kr"ugel, H. W. W. Spoon
We investigate the mid-infrared radiation of galaxies that are powered by a starburst or by an AGN. For this end, we compare the spectra obtained at different spatial scales in a s…
The use of OH "main" lines to constrain the variation of fundamental constants
Nissim Kanekar, Jayaram N Chengalur
We describe a new technique to measure variations in the fundamental parameters and , using the sum of the frequencies of cm-wave OH ``main'' lines. The techn…
The temperature of the WNM in the Milky Way
Nissim Kanekar, Ravi Subrahmanyan, Jayaram N. Chengalur +1
We report high spectral resolution Australia Telescope Compact Array HI 21 cm observations resulting in the detection of the warm neutral medium (WNM) of the Galaxy in absorption a…
The AGN Content of Ultraluminous IR Galaxies: High Resolution VLA Imaging of the IRAS 1Jy ULIRG Sample
Neil M. Nagar, Andrew S. Wilson, Heino Falcke +2
This paper presents the results of a high resolution radio imaging survey of 83 of the 118 ultraluminous infrared galaxies (ULIRGs) in the IRAS 1 Jy ULIRG sample. We have observed…
MOND and the "Dearth of Dark Matter in Ordinary Elliptical Galaxies"
Mordehai Milgrom, Robert H. Sanders
The recent findings of Romanowsky et al., of an ``unexpectedly'' small mass discrepancy within 5 effective radii in several elliptical galaxies, are not surprising in the context o…
Anomalous Evolution of the Dwarf Galaxy HIPASS J1321-31
Barton J. Pritzl, Patricia M. Knezek, John S. Gallagher +6
We present HST/WFPC2 observations of the dwarf galaxy HIPASS J1321-31. This unusual galaxy lies in the direction of the Centaurus A group of galaxies, and has a color-magnitude dia…
Outburst and Post-Outburst Active Phase of the Black Hole X-ray Binary V4641 Sgr in 2002
M. Uemura, T. Kato, R. Ishioka +19
The black hole X-ray binary V4641 Sgr experienced an outburst in 2002 May which was detected at X-ray, optical, and radio wavelengths. The outburst lasted for only 6 days, but the…
The European Large Area ISO Survey (ELAIS): The Final Band-merged Catalogue
ELAIS Consortium, :, M. Rowan-Robinson +16
We present the final band-merged ELAIS catalogue at 6.7, 15, 90, and 175 m, and the associated data at u,g,r,i,z,J,H,K, and 20cm. The origin of the survey, infrared and radio ob…