Skip to main content

Advertisement

SpringerLink
Log in

Application of the MST clustering to the high energy \(\gamma\)-ray sky. I—New possible detection of high-energy \(\gamma\)-ray emission associated with BL Lac objects

  • Original Article
  • Published:
Astrophysics and Space Science Aims and scope Submit manuscript

Abstract

In this paper we show an application of the Minimum Spanning Tree (MST) clustering method to the high-energy \(\gamma\)-ray sky observed at energies higher than 10 GeV in 6.3 years by the Fermi-Large Area Telescope. We report the detection of 19 new high-energy \(\gamma\)-ray clusters with good selection parameters whose centroid coordinates were found matching the positions of known BL Lac objects in the 5th Edition of the Roma-BZCAT catalogue. A brief summary of the properties of these sources is presented.

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

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7

Similar content being viewed by others

Notes

  1. http://www.slac.stanford.edu/exp/glast/groups/canda/lat_Performance.htm.

  2. http://fermi.gsfc.nasa.gov/ssc/data/access/.

  3. The fact that some sources are faint in the radio is typical of HBL objects. The 3LAC catalogue, for instance, includes 48 sources with a radio flux at 1.4 GHz lower than 10 mJy (about all of HSP type). Considering the fact that we are searching for faint gamma-ray sources (the bright ones are already in the 3FGL catalogue!) it reasonable to assume they could be also faint in the radio band.

  4. http://www.cv.nrao.edu/nvss/.

  5. http://sundog.stsci.edu/first/catalogs/readme.html.

  6. The Denoised, Deconvolved, and Decomposed Fermi \(\gamma\)-ray Sky, http://www.mpa-garching.mpg.de/ift/fermi/.

References

  • Abdo, A.A., Ackermann, M., Ajello, M., Allafort, A., Antolini, E., Atwood, W.B., Axelsson, M., Baldini, L., et al.: Astrophys. J. 715, 429 (2010)

    Article  ADS  Google Scholar 

  • Acero, F., Ackermann, M., Ajello, M., Albert, A., Atwood, W.B., Axelsson, M., Baldini, L., Ballet, J., et al.: Astrophys. J. Suppl. Ser. 218, 23 (2015)

    Article  ADS  Google Scholar 

  • Ackermann, M., Ajello, M., Allafort, A., Asano, K., Atwood, W.B., Baldini, L., Ballet, J., Barbiellini, G., et al.: Astrophys. J. 765, 54 (2013a)

    Article  ADS  Google Scholar 

  • Ackermann, M., Ajello, M., Allafort, A., Atwood, W.B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., et al.: Astrophys. J. Suppl. Ser. 209, 34 (2013b)

    Article  ADS  Google Scholar 

  • Bernieri, E., Campana, R., Massaro, E., Paggi, A., Tramacere, A.: Astron. Astrophys. 551, 5 (2013)

    Article  ADS  Google Scholar 

  • Campana, R., Massaro, E., Gasparrini, D., Cutini, S., Tramacere, A.: Mon. Not. R. Astron. Soc. 383, 1166 (2008)

    Article  ADS  Google Scholar 

  • Campana, R., Bernieri, E., Massaro, E., Tinebra, F., Tosti, G.: Astrophys. Space Sci. 347, 169 (2013)

    Article  ADS  Google Scholar 

  • Colafrancesco, S.: Astron. Astrophys. 396, 31 (2002)

    Article  ADS  Google Scholar 

  • Cutri, R.M., et al.: VizieR Online Data Catalog, vol. 2328 (2014)

    Google Scholar 

  • D’Abrusco, R., Massaro, F., Paggi, A., Smith, H.A., Masetti, N., Landoni, M., Tosti, G.: Astrophys. J. Suppl. Ser. 215, 14 (2014)

    Article  ADS  Google Scholar 

  • Hartman, R.C., Bertsch, D.L., Bloom, S.D., Chen, A.W., Deines-Jones, P., Esposito, J.A., Fichtel, C.E., Friedlander, D.P., et al.: Astrophys. J. Suppl. Ser. 123, 79 (1999)

    Article  ADS  Google Scholar 

  • Massaro, E., Nesci, R., Piranomonte, S.: Mon. Not. R. Astron. Soc. 422, 2322 (2012)

    Article  ADS  Google Scholar 

  • Massaro, E., Maselli, A., Leto, C., et al.: Multifrequency Catalogue of Blazars, 5th edn. Aracne Editrice, Rome (2014)

    Google Scholar 

  • Massaro, E., Maselli, A., Leto, C., Marchegiani, P., Perri, M., Giommi, P., Piranomonte, S.: Astrophys. Space Sci. 357, 75 (2015)

    Article  ADS  Google Scholar 

  • Massaro, F., D’Abrusco, R., Ajello, M., Grindlay, J.E., Smith, H.A.: Astrophys. J. Lett. 740, 48 (2011)

    Article  ADS  Google Scholar 

  • Massaro, F., D’Abrusco, R., Tosti, G., Ajello, M., Gasparrini, D., Grindlay, J.E., Smith, H.A.: Astrophys. J. 750, 138 (2012)

    Article  ADS  Google Scholar 

  • Neronov, A., Semikoz, D., Vovk, I.: Astron. Astrophys. 529, 59 (2011)

    Article  ADS  Google Scholar 

  • Nolan, P.L., Abdo, A.A., Ackermann, M., Ajello, M., Allafort, A., Antolini, E., Atwood, W.B., Axelsson, M., Baldini, L., Ballet, J., et al.: Astrophys. J. Suppl. Ser. 199, 31 (2012)

    Article  ADS  Google Scholar 

  • Selig, M., Vacca, V., Oppermann, N., Enßlin, T.A.: (2014). arXiv:1410.4562

  • Titov, O., Malkin, Z.: Astron. Astrophys. 506, 1477 (2009). arXiv:0911.3221

    Article  ADS  Google Scholar 

  • Tramacere, A., Vecchio, C.: Astron. Astrophys. 549, 138 (2013)

    Article  ADS  Google Scholar 

Download references

Acknowledgements

We acknowledge use of archival Fermi data. We made large use of the online version of the Roma-BZCAT and of the scientific tools developed at the ASI Science Data Center (ASDC), of the Sloan Digital Sky Survey (SDSS) archive, of the NED database and other astronomical catalogues distributed in digital form (Vizier and Simbad) at Centre de Dates astronomiques de Strasbourg (CDS) at the Louis Pasteur University.

Author information

Authors and Affiliations

  1. INAF–IASF-Bologna, via Piero Gobetti 101, 40129, Bologna, Italy

    R. Campana

  2. INAF–IAPS, via del Fosso del Cavaliere 100, 00133, Roma, Italy

    E. Massaro

  3. In Unam Sapientiam, Roma, Italy

    E. Massaro

  4. INFN–Sezione di Roma Tre, via della Vasca Navale 84, 00146, Roma, Italy

    E. Bernieri

  5. Dipartimento di Matematica e Fisica, Università di Roma Tre, via della Vasca Navale 84, 00146, Roma, Italy

    Q. D’Amato

Authors
  1. R. Campana
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. E. Massaro
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. E. Bernieri
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Q. D’Amato
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to R. Campana.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Campana, R., Massaro, E., Bernieri, E. et al. Application of the MST clustering to the high energy \(\gamma\)-ray sky. I—New possible detection of high-energy \(\gamma\)-ray emission associated with BL Lac objects. Astrophys Space Sci 360, 65 (2015). https://doi.org/10.1007/s10509-015-2570-6

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s10509-015-2570-6

Keywords

Search

Navigation