Publications

  • What do we really know about Spiral Galaxy Morphology

    stronomers have long learned to classify spirals in terms of their morphological features, primarily their bulges, discs, and bars. In addition other properties of discs are used in classification, notably spiral arms, warps and truncations. In this paper we show how with modern techniques parts of the basis of these standard classifications are

    Beckman, J. E. et al.

    Advertised on:

    12
    2006
  • What is the Milky Way outer halo made of?. High resolution spectroscopy of distant red giants

    In a framework where galaxies form hierarchically, extended stellar haloes are predicted to be an ubiquitous feature around Milky Way-like galaxies and to consist mainly of the shredded stellar component of smaller galactic systems. The type of accreted stellar systems are expected to vary according to the specific accretion and merging history of

    Battaglia, G. et al.

    Advertised on:

    12
    2017
  • What Is the Redshift of the Gamma-ray BL Lac Source S4 0954+65?

    High signal-to-noise ratio spectroscopic observations of the BL Lac object S4 0954+65 at the alleged redshift z = 0.367 are presented. This source was detected at gamma frequencies by the MAGIC (TeV) and FERMI (GeV) telescopes during a remarkable outburst that occurred in 2015 February, making the determination of its distance particularly relevant

    Landoni, M. et al.

    Advertised on:

    12
    2015
  • Wide-field Precision Kinematics of the M87 Globular Cluster System

    We present the most extensive combined photometric and spectroscopic study to date of the enormous globular cluster (GC) system around M87, the central giant elliptical galaxy in the nearby Virgo Cluster. Using observations from DEIMOS and the Low Resolution Imaging Spectrometer at Keck, and Hectospec on the Multiple Mirror Telescope, we derive new

    Strader, Jay et al.

    Advertised on:

    12
    2011
  • Widely separated binary systems of very low-mass stars

    In this paper we review some recent detections of wide binary brown dwarf systems and discuss them in the context of the multiplicity properties of very low-mass stars and brown dwarfs.

    Phan-Bao, N. et al.

    Advertised on:

    12
    2005
  • Wind Accretion and State Transitions in the Black Hole Binary Cyg X-1

    The black hole binary, Cyg X-1, is generally observed in one of two long duration X-ray states: a low flux, hard spectrum state (most common) and a high flux, soft spectrum state (rare). Models predict that the high/ soft state corresponds to a high mass transfer phase in the binary, and since the X-ray source is fueled by accretion from the

    Gies, D. R. et al.

    Advertised on:

    12
    2003