ar X iv : a st ro - p h / 97 10 18 3 v 1 1 6 O ct 1 99 7 A MODEL OF THE BROAD - BAND CONTINUUM OF NGC 5548

ar X iv : a st ro - p h / 97 07 20 2 v 1 1 7 Ju l 1 99 7 Broad - band continuum and variability of NGC 5548

We analyze a composite broad-band optical/UV/Xγ-ray spectrum of the Seyfert 1 galaxy NGC 5548. The spectrum consists of an average of simultaneous optical/IUE/Ginga observations accompanied by ROSAT and GRO/OSSE data from non-simultaneous observations. We show that the broad-band continuum is inconsistent with simple disk models extending to the soft X-rays. Instead, the soft-excess is well des...

ar X iv : a st ro - p h / 97 10 18 1 v 1 1 6 O ct 1 99 7 Note on a ’ hint ’ for an annual modulation signature of a 60 GeV WIMP

ar X iv : a st ro - p h / 95 10 10 0 v 1 1 9 O ct 1 99 5 Kinematics of the Broad Emission Line Region in NGC 5548

We derive both total flux and velocity-resolved response functions for the CIV 1549 emission line from the data obtained in the 1993 NGC 5548 monitoring campaign. These response functions imply: 1.) the emission region stretches from inside 1 lt-d to outside 10 lt-d, and is probably better described as round than flat; 2.) the velocity field is dominated by a red/blue symmetric component (e.g. ...

ar X iv : a st ro - p h / 97 10 36 7 v 1 3 1 O ct 1 99 7 Geometrical parametrization of warps for edge - on galaxies

ar X iv : a st ro - p h / 97 10 24 9 v 1 2 2 O ct 1 99 7 Searches for galaxies at z > ∼ 4 through Lyman – limit imaging

We present preliminary results of a search for galaxies at z > ∼ 4 through Lyman–limit imaging of the fields of known high–redshift radio–galaxies. Objects were selected by means of their broad–band colours, and spectroscopy of candidate objects in one of the fields has been performed through multi–slit spectroscopy at the 4.2m William Her-schel Telescope. These spectra show some of the first z...