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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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236 papers · 1 filter
Distant Cluster Hunting I: A Comparison Between the Optical and X-ray Luminosity Functions from an Optical/X-ray Survey
Megan Donahue, Jennifer Mack, Caleb Scharf +6
We present a comparison of X-ray and optical luminosities and luminosity functions of cluster candidates from a joint optical/X-ray survey, the ROSAT Optical X-Ray Survey. Complete…
Distant Cluster Hunting II: A comparison of X-ray and optical cluster detection techniques and catalogs from the ROX Survey
Megan Donahue, Caleb Scharf, Jennifer Mack +6
We present and analyze the optical and X-ray catalogs of moderate-redshift cluster candidates from the ROSAT Optical X-ray Survey, or ROXS. The survey covers 4.8 square degrees (23…
Spectroscopy of SN 1987A at 0.9-2.4 microns: Days 1348-3158
A. Fassia, W. P. S. Meikle, J. Spyromilio
We present near-infrared spectroscopic observations of SN 1987A covering the period 1358 to 3158 days post-explosion. This is the first time that IR spectra of a supernova have bee…
From old Globular Clusters to early Structures in the Universe: the Formation of old, metal-poor Halos around early-type Galaxies
Markus Kissler-Patig
Old, metal-poor globular clusters trace the formation and evolution of early-type galaxies. Their are the best probes, at low redshift, of the building-up of galaxy halos at high r…
The Large Zenith Telescope Survey: a deep survey using a 6-m liquid mirror telescope
Remi A. Cabanac, Paul Hickson, Valerie de Lapparent
The Large Zenith Telescope Survey whose construction is almost completed (first light expected in spring 2002) near Vancouver (Canada) is designed to observed a total strip of ~17'…
The different Clustering of red and blue galaxies: a robust signal from w(theta)
Remi A. Cabanac, Valerie de Lapparent, P. Hickson
A sample of ~20,000 galaxies covering 0.76 deg2 were observed with the CFHT-UH8K up to V<23.5 and I<22.5. The angular correlation analysis of the red selected sample (V-I>1.4) show…
Near Infrared Observations of Galactic Black Hole Candidates
S. Chaty, I. F. Mirabel, P. Goldoni +4
We report on several European Southern Observatory (ESO) near-infrared (NIR) observational campaigns aimed at understanding the nature of galactic black hole candidates. Our result…
A new 21-cm absorber identified with an galaxy
Nissim Kanekar, Ramana M. Athreya, Jayaram N. Chengalur
We present Giant Metrewave Radio Telescope (GMRT) observations of redshifted 21-cm absorption from the metal line absorption system towards PKS 1243-072. HI absorption is…
Exploring the intergalactic medium with VLT/UVES
S. Cristiani, S. Bianchi, S. D'Odorico +1
The remarkable efficiency of the UVES spectrograph at the VLT has made it possible to push high-resolution, high-S/N ground observations of the Ly-a forest down to z~1.5, gaining n…
Hidden star-formation in the cluster of galaxies Abell 1689
P. -A. Duc, B. Poggianti, D. Fadda. D. Elbaz +5
At a redshift of 0.18, Abell 1689 is so far the most distant cluster of galaxies for which substantial mid-infrared (MIR) data have been published. We present here the follow-up op…
An Optical Time-Delay for the Lensed BAL Quasar HE2149-2745
I. Burud, F. Courbin, P. Magain +11
We present optical V and i-band light curves of the gravitationally lensed BAL quasar HE2149-2745. The data, obtained with the 1.5m Danish Telescope (ESO-La Silla) between October…
Associated absorption in radio quasars. I. C IV absorption and the growth of radio sources
J. C. Baker, R. W. Hunstead, R. M. Athreya +4
We assess the global properties of associated C IV 1548,1550 absorption lines measured in the spectra of radio-loud quasars drawn from a near-complete, low-frequency selected sampl…
The CORALS Survey II: Clues to Galaxy Clustering Around QSOs from z_abs ~ z_em Damped Lyman Alpha Systems
Sara L. Ellison, Lin Yan, Isobel M. Hook +3
We present a list of z_abs ~ z_em (Delta v < 3000 km/s) DLAs discovered during the CORALS survey for absorbers in a radio-selected QSO sample. On the assumption that z_abs ~ z_em D…
The host galaxy of GRB010222: The strongest damped Lyman-alpha system known
I. Salamanca, L. Kaper, P. M. Vreeswijk +6
Analysis of the absorption lines in the afterglow spectrum of the gamma-ray burst GRB010222 indicates that its host galaxy (at a redshift of z=1.476) is the strongest damped Lyman-…
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…
Ongoing massive star formation in the bulge of M51
H. J. G. L. M. Lamers, N. Panagia, S. Scuderi +4
We studied the HST-WFPC2 observations of the inner kpc of the interacting galaxy M51 in six bands from 2550 to 8140 Angstrom. The images show an oval shaped area ("bulge") of 11x16…
The evolution of disk galaxies in clusters
A. Aragon-Salamanca, B. Milvang-Jensen, G. Hau +2
We are carrying out a programme to measure the evolution of the stellar and dynamical masses and M/L ratios for a sizeable sample of morphologically-classified disk galaxies in ric…
The cosmic microwave background radiation temperature at z = 3.025 toward QSO 0347--3819
P. Molaro, S. A. Levshakov, M. Dessauges-Zavadsky +1
From the analysis of the CII fine-structure population ratio in the damped Ly_alpha system at z = 3.025 toward the quasar Q0347--3819 we derive an upper bound of 14.6 (+/- 0.2) K o…
Dynamical Masses of Young Star Clusters in NGC 4038/4039
Sabine Mengel, Matthew D. Lehnert, Niranjan Thatte +1
In order to estimate the masses of the compact, young star clusters in the merging galaxy pair, NGC 4038/4039 (``the Antennae''), we have obtained medium and high resolution spectr…
An unusually massive stellar black hole in the Galaxy
J. Greiner, J. G. Cuby, M. J. McCaughrean
Here we report a measurement of the orbital period and mass function of GRS 1915+105 which allow us to deduce a mass of 14 +- 4 solar masses for its black hole. This large mass pro…
Lyman Continuum Escape from Inhomogeneous ISM
B. Ciardi, S. Bianchi, A. Ferrara
We have studied the effects of gas density inhomogeneities on the escape of ionising Lyman continuum (Lyc) photons from Milky Way-type galaxies via 3D numerical simulations using t…
The K20 survey. I. Disentangling old and dusty star-forming galaxies in the ERO population
A. Cimatti, E. Daddi, M. Mignoli +12
We present the results of VLT optical spectroscopy of a complete sample of 78 EROs with R-Ks\geq5 over a field of 52 arcmin^2. About 70% of the 45 EROs with Ks\leq19.2 have been sp…
The Spectral Energy Distribution of the Seyfert galaxy Ton S180
T. J. Turner, P. Romano, S. B. Kraemer +14
We present spectral results from a multi-satellite, broad-band campaign on the Narrow-line Seyfert 1 galaxy Ton S180 performed at the end of 1999. We discuss the spectral-energy di…
Chandra Detection of a TypeII Quasar at z=3.288
Daniel Stern, Edward C. Moran, Alison L. Coil +16
We report on observations of a TypeII quasar at redshift z=3.288, identified as a hard X-ray source in a 185 ks observation with the Chandra X-ray Observatory and as a high-redshif…