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  1. No Access

    Chapter and Conference Paper

    Map** cool gas in the ISM with ROSAT

    We have investigated the distribution of cool gas within the local interstellar medium (<150 pc) using data derived from both the ROSAT X-ray and EUV all-sky surveys. The EUV/X-ray spectra for a sample of 89 w...

    I. B. Hutchinson, R. S. Warwick… in The Local Bubble and Beyond Lyman-Spitzer-… (1998)

  2. No Access

    Chapter and Conference Paper

    Small-scale 1/4keV fluctuations due to the local hot bubble

    To determine fluctuations in the 1/4 keV emission due to the LHB, without contamination due to sources within the galactic disk, the Galactic halo or the extragalactic background, we have formed a mosaic of PS...

    K. D. Kuntz, S. L. Snowden, R. S. Warwick in The Local Bubble and Beyond Lyman-Spitzer-… (1998)

  3. No Access

    Chapter and Conference Paper

    Features of the Soft X-ray Background and Implications for the EUV Background

    A series of eight overlap** ROSAT PSPC observations situated in the Lockman hole region have been analysed in the 0.1 – 0.4 keV band. The total exposure of ∼ 137 ks and the ultra-low interstellar column density...

    C. R. Barber, R. S. Warwick in Astrophysics in the Extreme Ultraviolet (1996)

  4. No Access

    Chapter and Conference Paper

    The X-ray variability of active galactic nuclei

    Recent results relating to the X-ray variability exhibited by active galactic nuclei are reviewed. EXOSAT observations have established, contrary to earlier indications, that X-ray variability on a timescale of a...

    R. S. Warwick in The Physics of Accretion onto Compact Objects (1986)

  5. No Access

    Chapter and Conference Paper

    A New View of the Galactic Plane with Exosat

    Anew X-ray image of the galactic plane has been produced using the 45 arcmin square field of view of the Medium Energy Instrument on EXOSAT. This image shows a total of 64 sources including 18 new ones which i...

    M. J. L. Turner, R. S. Warwick, M. G. Watson… in X-Ray Astronomy in the Exosat Era (1985)

  6. No Access

    Chapter and Conference Paper

    EXOSAT Observations of the BL Lac Object MKN 421

    The BL Lac object Mkn 421 was observed by EXOSAT four times over a period of six days in February 1984. Significant X-ray variability was apparent on a timescale of less than a day, but with no accompanying sp...

    R. S. Warwick, I. McHardy, K. A. Pounds in X-Ray Astronomy in the Exosat Era (1985)

  7. No Access

    Chapter and Conference Paper

    The Soft X-Ray Spectrum of NGC 4151

    EXOSAT observations of the Seyfert galaxy NGC 4151 over the period July 1983 to April 1984 have revealed a decreasing flux in the 2 – 10 keV band. In accord with previous measurements a power law spectrum atte...

    K. A. Pounds, R. S. Warwick, J. L. Culhane… in X-Ray Astronomy in the Exosat Era (1985)

  8. No Access

    Chapter and Conference Paper

    Exosat Observations of the X-Ray Pulsar 4U1145-619

    EXOSAT observations of the X-ray pulsar 4U1145-619 during June and July 1983 and July 1984 confirm that this source shows a regular 187 day outburst cycle in X-rays. The results from pulse timing and X-ray spe...

    R. S. Warwick, M. G. Watson, R. Willingale in X-Ray Astronomy in the Exosat Era (1985)

  9. No Access

    Chapter and Conference Paper

    Periodic X-Ray Outbursts from A0535+26, 2S1145-619 and GX301-2

    We report Ariel V(SSI) observations of three X-ray pulsars A0535+26, 2S1145-619 and GX301-2 (2S1223-624). These sources exhibit X-ray outbursts which appear, on the basis of observations extending over ∿ 5 yea...

    R. S. Warwick, M. G. Watson, M. R. Sims in X-Ray Astronomy (1981)

  10. No Access

    Chapter and Conference Paper

    Ultraviolet, Optical and X-Ray Monitoring of the Continuum of NGC 4151

    The nucleus of the Seyfert galaxy NGC 4151 has been extensively monitored with the International Ultraviolet Explorer (IUE) in the wave- length range 1200–3000 Å, a region of the spectrum where the contaminati...

    G. C. Perola, A. Boksenberg, G. E. Bromage, J. Clavel, M. Elvis… in X-Ray Astronomy (1981)