Now showing items 31-40 of 104
Compact massive objects in Virgo galaxies: the black hole population
(Blackwell Publishing Ltd, 2008-03-11)
We investigate the distribution of massive black holes (MBHs) in the Virgo cluster. Observations suggest that active galactic nuclei activity is widespread in massive galaxies ( M * > 10 10 M ⊙ ), while at lower galaxy ...
Expectations for an interferometric Sunyaev-Zeldovich effect survey for galaxy clusters
(Univ Chicago Press, 2000-12-01)
We estimate the expected yield of a nontargeted survey for galaxy clusters using the Sunyaev-Zeldovich effect (SZE). Estimating survey yields requires a detailed model for both cluster properties and the survey strategy. ...
A cold front in a preheated galaxy cluster
(Univ Chicago Press, 2002-10-10)
We present a simulated cluster of galaxies, modeled with a preheated intracluster medium, that exhibits X-ray features similar to the cold fronts seen in Chandra observations. Mock observations at a particular epoch show ...
Frequency-dependent time delays for strong outbursts in selected blazars from the MetsÄhovi and UMRAO monitoring data bases – II
(Blackwell Publishing Ltd, 2007-10-21)
We analyse the radio light curves of the blazars 1308+326, 2223−052 and 2251+158 using University of Michigan Radio Observatory and MetsÄhovi Radio Observatory multifrequency monitoring data combined with high-resolution ...
Protostellar Disk Formation and Early Evolution
(Kluwer Academic Publishers; Springer Science+Business Media, 2000-03)
This contribution describes the formation of circumstellar disks and their earliest evolutionary phases when self-gravity in the disk plays a crucial role in eliciting the transport of mass and angular momentum. We first ...
The X-ray size-temperature relation for intermediate-redshift galaxy clusters
(Univ Chicago Press, 2000-11-20)
We present the first measurements of the X-ray size-temperature (ST) relation in intermediate-redshift (z similar to 0.30) galaxy clusters. We interpret the local ST relation (z similar to 0.06) in terms of underlying ...
Unusual optical quiescence of the classical BL Lac object PKS 0735+178 on intranight time-scale
(Blackwell Publishing Ltd, 2009-11-01)
We present the result of our extensive intranight optical monitoring of the well-known low-energy peaked BL Lac (LBL) object PKS 0735+178. This long-term follow-up consists of R -band monitoring for a minimum duration of ...
Correlated multiwavelength emission from the X-ray-bright Seyfert galaxy III Zw 2
(Blackwell Science Ltd, 2002-09)
The X-ray-bright Seyfert 1 galaxy III Zw 2 was observed with XMM–Newton in 2000 July. Its X-ray spectrum can be described by a power law of photon index Γ= 1.7 and an extremely broad (FWHM∼ 140 000 km s −1 ) Fe KΑ line at ...
Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: a new challenge for our understanding of HgMn stars ★
(Blackwell Publishing Ltd, 2006-10-01)
We present the results of a high spectral resolution study of the eclipsing binary AR Aur. AR Aur is the only known eclipsing binary with a HgMn primary star exactly on the zero-age main sequence (ZAMS) and a secondary ...
The SDSS-C4 DR2 Galaxy Cluster Catalog
(2005-09-01)
We present the C4 Cluster Catalog, a new sample of 748 clusters of galaxies identified in the spectroscopic sample of the Second Data Release (DR2) of the Sloan Digital Sky Survey (SDSS). The C4 cluster-finding algorithm ...