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ar X iv : a st ro - p h / 99 02 06 2 v 1 4 F eb 1 99 9 SOURCES OF RELATIVISTIC JETS IN THE GALAXY

ar X iv : a st ro - p h / 98 02 08 2 v 1 6 F eb 1 99 8 What is the True Covering Factor of Absorbing Matter in BALQSO ’ s ?

ar X iv : a st ro - p h / 97 02 07 4 v 1 7 F eb 1 99 7 The hosts of z = 2 QSOs

We present results of the hosts of four high-redshift (z ≈ 2) and high luminosity (MB ∼ −28 mag) QSOs, three radio-quiet one radio-loud, imaged in R and K bands. The extensions to the nuclear unresolved source are most likely due to the hosts galaxies of these QSOs, with luminosities at rest-frame 2300Å of at least 3−7 per cent of the QSO luminosity, and most likely around 6−18 per cent of the ...

ar X iv : a st ro - p h / 98 02 02 7 v 1 3 F eb 1 99 8 Recalibration of Luminosity –

A recalibration of the luminosity–linewidth technique is discussed which introduces (i) new cluster calibration data, (ii) new corrections for reddening as a function of inclination, and (iii) a new zero-point calibration using 13 galaxies with distances determined via the cepheid period– luminosity method. It is found that H 0 = 82 ± 16 km s −1 Mpc −1 (95% confidence).

ar X iv : a st ro - p h / 98 02 02 8 v 1 3 F eb 1 99 8 Phase Transitions in Neutron Stars

Phase transitions in neutron stars due to formation of quark matter, kaon condensates, etc. are discussed with particular attention to the order of these transitions. Observational consequences of phase transitions in pulsar angular velocities are examined.