Skip to main content
SpringerLink
Log in

VLT Optical Spectroscopy of BL Lac Objects

  • Observations of Supermassivbe Black Holes at Higher Redshift
  • Conference paper
  • First Online:
Growing Black Holes: Accretion in a Cosmological Context

Part of the book series: ESO Astrophysics Symposia ((ESO))

  • 75 Accesses

Abstract

We report here the first results of a program aimed at obtaining high signal to noise (up to ~ 500) optical spectroscopy of a large sample of BL Lac objects using ESO VLT+FORS1. New spectroscopic observations have been obtained for 31 objects, which allows us to obtain new redshift for 13 targets and provide better classification for others. In a number of cases no lines are detected and lower limits to the redshift can be estimated.

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Log in via an institution

Institutional subscriptions

Author information

Authors and Affiliations

  1. Università dell’Insubria, Dip. di Fisica, Via Valleggio 11 I-22100 Como, Italy

    B. Sbarufatti & A. Treves

  2. INAF, Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5 I-35122 Padova, Italy

    R. Falomo

  3. Lanenssterwarte Heidelberg, Königstuhl D-69117 Heidelberg, Germany

    J. Heidt

  4. Tuorla Observatory, University of Turku Väisäläntie 20 FIN-21500 Piikkiö, Finland

    J. Kotilainen

  5. European Southern Observatory, 3107 Alonso de Cordova Santiago, Chile

    R. Scarpa

Authors
  1. B. Sbarufatti
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. Treves
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. R. Falomo
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. J. Heidt
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. J. Kotilainen
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. R. Scarpa
    View author publications

    You can also search for this author in PubMed Google Scholar

Editor information

Andrea Merloni Sergei Nayakshin Rashid A. Sunyaev

Rights and permissions

Reprints and permissions

About this paper

Cite this paper

Sbarufatti, B., Treves, A., Falomo, R., Heidt, J., Kotilainen, J., Scarpa, R. VLT Optical Spectroscopy of BL Lac Objects. In: Merloni, A., Nayakshin, S., Sunyaev, R.A. (eds) Growing Black Holes: Accretion in a Cosmological Context. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11403913_23

Download citation

  • DOI: https://doi.org/10.1007/11403913_23

  • Published:

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-25275-7

  • Online ISBN: 978-3-540-31639-8

  • eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)

Publish with us

Policies and ethics

Search

Navigation