BL Lacertae identifications in a ROSAT-selected sample of Fermi unidentified objects

N. Masetti, Boris Sbarufatti, P. Parisi, E. Jiménez-Bailón, V. Chavushyan, F. P.A. Vogt, V. Sguera, J. B. Stephen, E. Palazzi, L. Bassani, A. Bazzano, M. Fiocchi, G. Galaz, R. Landi, A. Malizia, D. Minniti, L. Morelli, P. Ubertini

Research output: Contribution to journalArticle

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Abstract

The optical spectroscopic followup of 27 sources belonging to a sample of 30 high-energy objects selected by positionally cross correlating the first Fermi/LAT Catalog and the ROSAT All-Sky Survey Bright Source Catalog is presented here. It has been found or confirmed that 25 of them are BL Lacertae objects (BL Lacs), while the remaining two are Galactic cataclysmic variables (CVs). This strongly suggests that the sources in the first group are responsible for the GeV emission detected with Fermi, while the two CVs most likely represent spurious associations. We thus find an 80% a posteriori probability that the sources selected by matching GeV and X-ray catalogs belong to the BL Lac class. We also show suggestions that the BL Lacs selected with this approach are probably high-synchrotron-peaked sources and in turn good candidates for the detection of ultra-high-energy (TeV) photons from them.

Original languageEnglish (US)
Article numberA58
JournalAstronomy and Astrophysics
Volume559
DOIs
StatePublished - Nov 21 2013

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BL Lacertae objects
catalogs
cataclysmic variables
energy
suggestion
synchrotrons
photons
x rays
detection

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Masetti, N., Sbarufatti, B., Parisi, P., Jiménez-Bailón, E., Chavushyan, V., Vogt, F. P. A., ... Ubertini, P. (2013). BL Lacertae identifications in a ROSAT-selected sample of Fermi unidentified objects. Astronomy and Astrophysics, 559, [A58]. https://doi.org/10.1051/0004-6361/201322611
Masetti, N. ; Sbarufatti, Boris ; Parisi, P. ; Jiménez-Bailón, E. ; Chavushyan, V. ; Vogt, F. P.A. ; Sguera, V. ; Stephen, J. B. ; Palazzi, E. ; Bassani, L. ; Bazzano, A. ; Fiocchi, M. ; Galaz, G. ; Landi, R. ; Malizia, A. ; Minniti, D. ; Morelli, L. ; Ubertini, P. / BL Lacertae identifications in a ROSAT-selected sample of Fermi unidentified objects. In: Astronomy and Astrophysics. 2013 ; Vol. 559.
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Masetti, N, Sbarufatti, B, Parisi, P, Jiménez-Bailón, E, Chavushyan, V, Vogt, FPA, Sguera, V, Stephen, JB, Palazzi, E, Bassani, L, Bazzano, A, Fiocchi, M, Galaz, G, Landi, R, Malizia, A, Minniti, D, Morelli, L & Ubertini, P 2013, 'BL Lacertae identifications in a ROSAT-selected sample of Fermi unidentified objects', Astronomy and Astrophysics, vol. 559, A58. https://doi.org/10.1051/0004-6361/201322611

BL Lacertae identifications in a ROSAT-selected sample of Fermi unidentified objects. / Masetti, N.; Sbarufatti, Boris; Parisi, P.; Jiménez-Bailón, E.; Chavushyan, V.; Vogt, F. P.A.; Sguera, V.; Stephen, J. B.; Palazzi, E.; Bassani, L.; Bazzano, A.; Fiocchi, M.; Galaz, G.; Landi, R.; Malizia, A.; Minniti, D.; Morelli, L.; Ubertini, P.

In: Astronomy and Astrophysics, Vol. 559, A58, 21.11.2013.

Research output: Contribution to journalArticle

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T1 - BL Lacertae identifications in a ROSAT-selected sample of Fermi unidentified objects

AU - Masetti, N.

AU - Sbarufatti, Boris

AU - Parisi, P.

AU - Jiménez-Bailón, E.

AU - Chavushyan, V.

AU - Vogt, F. P.A.

AU - Sguera, V.

AU - Stephen, J. B.

AU - Palazzi, E.

AU - Bassani, L.

AU - Bazzano, A.

AU - Fiocchi, M.

AU - Galaz, G.

AU - Landi, R.

AU - Malizia, A.

AU - Minniti, D.

AU - Morelli, L.

AU - Ubertini, P.

PY - 2013/11/21

Y1 - 2013/11/21

N2 - The optical spectroscopic followup of 27 sources belonging to a sample of 30 high-energy objects selected by positionally cross correlating the first Fermi/LAT Catalog and the ROSAT All-Sky Survey Bright Source Catalog is presented here. It has been found or confirmed that 25 of them are BL Lacertae objects (BL Lacs), while the remaining two are Galactic cataclysmic variables (CVs). This strongly suggests that the sources in the first group are responsible for the GeV emission detected with Fermi, while the two CVs most likely represent spurious associations. We thus find an 80% a posteriori probability that the sources selected by matching GeV and X-ray catalogs belong to the BL Lac class. We also show suggestions that the BL Lacs selected with this approach are probably high-synchrotron-peaked sources and in turn good candidates for the detection of ultra-high-energy (TeV) photons from them.

AB - The optical spectroscopic followup of 27 sources belonging to a sample of 30 high-energy objects selected by positionally cross correlating the first Fermi/LAT Catalog and the ROSAT All-Sky Survey Bright Source Catalog is presented here. It has been found or confirmed that 25 of them are BL Lacertae objects (BL Lacs), while the remaining two are Galactic cataclysmic variables (CVs). This strongly suggests that the sources in the first group are responsible for the GeV emission detected with Fermi, while the two CVs most likely represent spurious associations. We thus find an 80% a posteriori probability that the sources selected by matching GeV and X-ray catalogs belong to the BL Lac class. We also show suggestions that the BL Lacs selected with this approach are probably high-synchrotron-peaked sources and in turn good candidates for the detection of ultra-high-energy (TeV) photons from them.

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SN - 0004-6361

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