The LINER galaxies NGC2911, NGC 3079, NGC3998, and NGC6500 were observed at 5 GHz with the European VLBI Network at a resolution of 5 milliarcsecond and found to possess flat-spectrum, variable, highbrightness temperature (TB > 10 8 K) radio cores. These radio characteristics reinforce the view that these LINERs host central engines associated with active galactic nuclei.

ABSTRACT The Planck list of high-redshift source candidates (the PHz catalogue) contains 2151 peaks in the cosmic infrared background, unresolved by Planck’s 5 arcmin beam. Follow-up spectroscopic observations have revealed that some these objects are $z\, {\approx }\, 2$ protoclusters and strong gravitational lenses but an unbiased survey has not yet been carried out. To this end, we used arch...

We consider the properties of the warped accretion disc in NGC 4258 which is delineated by maser emission. We use our analytical models to consider whether the disc could be warped by Lense-Thirring precession. We show that such models fit the shape of the disc well and we determine the goodness of fit for various combinations of the warp radius and the disc and black hole configurations. Thoug...

Using available kinematical data for a sub-sample of NLTT stars from the HIPPARCOS mission we confirm the existence of a previously reported local anomaly in the (u, v) plane: the mean motion u for our sample is largely positive (+20 km s −1). With the use of the newest global self-consistent numerical models of our Galaxy (Fux 1997), we show that a bar could be responsible for this observed ve...

We derive the spectral energy distribution (SED) of the nucleus of the Seyfert galaxy NGC 4565. The nuclear source is substantially unabsorbed. The absorption we find from Chandra data is NH = 2.5× 10 cm is consistent with that produced by material in the galactic disk of the host galaxy. HST images show a nuclear unresolved source in all of the available observations, from the near-IR H band t...

tbe International AGN Watch, an informal consortium of over 100 astronomers, was established to coordinate multiwavelength monitoring of a limited number of active galactic nuclei ' and thus obtain comprehensive continuum and emission-tine variability data with unprecedented temporal and wavelength coverage. In this review, we summarize the principal scientific results from two completed space-...

We report the results of a spectropolarimetric survey of the CfA and 12μm samples of Seyfert 2 galaxies (S2s). Polarized (hidden) broad line regions (HBLRs) are confirmed in a number of galaxies, and several new cases (F02581–1136, MCG -3-58-7, NGC 5995, NGC 6552, NGC 7682) are reported. The 12μm S2 sample shows a significantly higher incidence of HBLR (50%) than its CfA counterpart (30%), sugg...

Corresponding Author: Muhammad Arif Saifudin Satellite Technology Center, Indonesian National Institute of Aeronautics and Space, Bogor, Indonesia Email: [email protected] Abstract: A new method to generate star catalog using density-based clustering is proposed. It identifies regions of a high star density by using Density-Based Spatial Clustering of Application with Noise (DBSCAN) alg...

The Romanian Astronomical Plate Archive consists of 10550 plates of which 8169 are of ast roids observations. A total of 850 asteroids and 78 comets were observed in the 1930-2005 period. After a careful investigation of the whole plate archive we discovered that a series of observations were not capitalized, such as a set of minor planets which were observed during 1930-1955. The lack of accur...