Looking for blazars in a sample of unidentified high-energy emitting Fermi sources

E. J. Marchesini, N. Masetti, V. Chavushyan, S. A. Cellone, I. Andruchow, L. Bassani, A. Bazzano, E. Jiménez-Bailón, R. Landi, A. Malizia, E. Palazzi, V. Patiño-Álvarez, G. A. Rodríguez-Castillo, J. B. Stephen, P. Ubertini

Resultado de la investigación: Article

9 Citas (Scopus)

Resumen

Context. Based on their overwhelming dominance among associated Fermi γ-ray catalogue sources, it is expected that a large fraction of the unidentified Fermi objects are blazars. Through crossmatching between the positions of unidentified γ-ray sources from the First Fermi Catalog of γ-ray sources emitting above 10 GeV (1FHL) and the ROSAT and Swift/XRT catalogues of X-ray objects and between pointed XRT observations, a sample of 36 potential associations was found in previous works with less than 15 arcsec of positional offset. One-third of them have recently been classified; the remainder, though believed to belong to the blazar class, still lack spectroscopic classifications. Aims. We study the optical spectrum of the putative counterparts of these unidentified gamma-ray sources in order to find their redshifts and to determine their nature and main spectral characteristics. Methods. An observational campaign was carried out on the putative counterparts of 13 1FHL sources using medium-resolution optical spectroscopy from the Osservatorio Astronomico di Bologna in Loiano, Italy; the Telescopio Nazionale Galileo and the Nordic Optical Telescope, both in the Canary Islands, Spain; and the Observatorio Astronómico Nacional San Pedro Mártir in Baja California, Mexico. Results. We were able to classify 14 new objects based on their continuum shapes and spectral features. Conclusions. Twelve new blazars were found, along with one new quasar and one new narrow line Seyfert 1 (NLS1) to be potentially associated with the 1FHL sources of our sample. Redshifts or lower limits were obtained when possible alongside central black hole mass and luminosity estimates for the NLS1 and the quasar.

Idioma originalEnglish
Número de artículoA10
PublicaciónAstronomy and Astrophysics
Volumen596
DOI
EstadoPublished - 1 dic 2016

Huella dactilar

blazars
spectroscopy
catalogs
rays
energy
quasars
Lower California (Mexico)
Canary Islands
Mexico
Spain
Italy
optical spectrum
luminosity
method
telescopes
continuums
estimates
x rays

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Marchesini, E. J., Masetti, N., Chavushyan, V., Cellone, S. A., Andruchow, I., Bassani, L., ... Ubertini, P. (2016). Looking for blazars in a sample of unidentified high-energy emitting Fermi sources. Astronomy and Astrophysics, 596, [A10]. https://doi.org/10.1051/0004-6361/201629028
Marchesini, E. J. ; Masetti, N. ; Chavushyan, V. ; Cellone, S. A. ; Andruchow, I. ; Bassani, L. ; Bazzano, A. ; Jiménez-Bailón, E. ; Landi, R. ; Malizia, A. ; Palazzi, E. ; Patiño-Álvarez, V. ; Rodríguez-Castillo, G. A. ; Stephen, J. B. ; Ubertini, P. / Looking for blazars in a sample of unidentified high-energy emitting Fermi sources. En: Astronomy and Astrophysics. 2016 ; Vol. 596.
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abstract = "Context. Based on their overwhelming dominance among associated Fermi γ-ray catalogue sources, it is expected that a large fraction of the unidentified Fermi objects are blazars. Through crossmatching between the positions of unidentified γ-ray sources from the First Fermi Catalog of γ-ray sources emitting above 10 GeV (1FHL) and the ROSAT and Swift/XRT catalogues of X-ray objects and between pointed XRT observations, a sample of 36 potential associations was found in previous works with less than 15 arcsec of positional offset. One-third of them have recently been classified; the remainder, though believed to belong to the blazar class, still lack spectroscopic classifications. Aims. We study the optical spectrum of the putative counterparts of these unidentified gamma-ray sources in order to find their redshifts and to determine their nature and main spectral characteristics. Methods. An observational campaign was carried out on the putative counterparts of 13 1FHL sources using medium-resolution optical spectroscopy from the Osservatorio Astronomico di Bologna in Loiano, Italy; the Telescopio Nazionale Galileo and the Nordic Optical Telescope, both in the Canary Islands, Spain; and the Observatorio Astron{\'o}mico Nacional San Pedro M{\'a}rtir in Baja California, Mexico. Results. We were able to classify 14 new objects based on their continuum shapes and spectral features. Conclusions. Twelve new blazars were found, along with one new quasar and one new narrow line Seyfert 1 (NLS1) to be potentially associated with the 1FHL sources of our sample. Redshifts or lower limits were obtained when possible alongside central black hole mass and luminosity estimates for the NLS1 and the quasar.",
keywords = "BL Lacertae objects: general, Galaxies: active, Gamma rays: general, X-rays: general",
author = "Marchesini, {E. J.} and N. Masetti and V. Chavushyan and Cellone, {S. A.} and I. Andruchow and L. Bassani and A. Bazzano and E. Jim{\'e}nez-Bail{\'o}n and R. Landi and A. Malizia and E. Palazzi and V. Pati{\~n}o-{\'A}lvarez and Rodr{\'i}guez-Castillo, {G. A.} and Stephen, {J. B.} and P. Ubertini",
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Marchesini, EJ, Masetti, N, Chavushyan, V, Cellone, SA, Andruchow, I, Bassani, L, Bazzano, A, Jiménez-Bailón, E, Landi, R, Malizia, A, Palazzi, E, Patiño-Álvarez, V, Rodríguez-Castillo, GA, Stephen, JB & Ubertini, P 2016, 'Looking for blazars in a sample of unidentified high-energy emitting Fermi sources', Astronomy and Astrophysics, vol. 596, A10. https://doi.org/10.1051/0004-6361/201629028

Looking for blazars in a sample of unidentified high-energy emitting Fermi sources. / Marchesini, E. J.; Masetti, N.; Chavushyan, V.; Cellone, S. A.; Andruchow, I.; Bassani, L.; Bazzano, A.; Jiménez-Bailón, E.; Landi, R.; Malizia, A.; Palazzi, E.; Patiño-Álvarez, V.; Rodríguez-Castillo, G. A.; Stephen, J. B.; Ubertini, P.

En: Astronomy and Astrophysics, Vol. 596, A10, 01.12.2016.

Resultado de la investigación: Article

TY - JOUR

T1 - Looking for blazars in a sample of unidentified high-energy emitting Fermi sources

AU - Marchesini, E. J.

AU - Masetti, N.

AU - Chavushyan, V.

AU - Cellone, S. A.

AU - Andruchow, I.

AU - Bassani, L.

AU - Bazzano, A.

AU - Jiménez-Bailón, E.

AU - Landi, R.

AU - Malizia, A.

AU - Palazzi, E.

AU - Patiño-Álvarez, V.

AU - Rodríguez-Castillo, G. A.

AU - Stephen, J. B.

AU - Ubertini, P.

PY - 2016/12/1

Y1 - 2016/12/1

N2 - Context. Based on their overwhelming dominance among associated Fermi γ-ray catalogue sources, it is expected that a large fraction of the unidentified Fermi objects are blazars. Through crossmatching between the positions of unidentified γ-ray sources from the First Fermi Catalog of γ-ray sources emitting above 10 GeV (1FHL) and the ROSAT and Swift/XRT catalogues of X-ray objects and between pointed XRT observations, a sample of 36 potential associations was found in previous works with less than 15 arcsec of positional offset. One-third of them have recently been classified; the remainder, though believed to belong to the blazar class, still lack spectroscopic classifications. Aims. We study the optical spectrum of the putative counterparts of these unidentified gamma-ray sources in order to find their redshifts and to determine their nature and main spectral characteristics. Methods. An observational campaign was carried out on the putative counterparts of 13 1FHL sources using medium-resolution optical spectroscopy from the Osservatorio Astronomico di Bologna in Loiano, Italy; the Telescopio Nazionale Galileo and the Nordic Optical Telescope, both in the Canary Islands, Spain; and the Observatorio Astronómico Nacional San Pedro Mártir in Baja California, Mexico. Results. We were able to classify 14 new objects based on their continuum shapes and spectral features. Conclusions. Twelve new blazars were found, along with one new quasar and one new narrow line Seyfert 1 (NLS1) to be potentially associated with the 1FHL sources of our sample. Redshifts or lower limits were obtained when possible alongside central black hole mass and luminosity estimates for the NLS1 and the quasar.

AB - Context. Based on their overwhelming dominance among associated Fermi γ-ray catalogue sources, it is expected that a large fraction of the unidentified Fermi objects are blazars. Through crossmatching between the positions of unidentified γ-ray sources from the First Fermi Catalog of γ-ray sources emitting above 10 GeV (1FHL) and the ROSAT and Swift/XRT catalogues of X-ray objects and between pointed XRT observations, a sample of 36 potential associations was found in previous works with less than 15 arcsec of positional offset. One-third of them have recently been classified; the remainder, though believed to belong to the blazar class, still lack spectroscopic classifications. Aims. We study the optical spectrum of the putative counterparts of these unidentified gamma-ray sources in order to find their redshifts and to determine their nature and main spectral characteristics. Methods. An observational campaign was carried out on the putative counterparts of 13 1FHL sources using medium-resolution optical spectroscopy from the Osservatorio Astronomico di Bologna in Loiano, Italy; the Telescopio Nazionale Galileo and the Nordic Optical Telescope, both in the Canary Islands, Spain; and the Observatorio Astronómico Nacional San Pedro Mártir in Baja California, Mexico. Results. We were able to classify 14 new objects based on their continuum shapes and spectral features. Conclusions. Twelve new blazars were found, along with one new quasar and one new narrow line Seyfert 1 (NLS1) to be potentially associated with the 1FHL sources of our sample. Redshifts or lower limits were obtained when possible alongside central black hole mass and luminosity estimates for the NLS1 and the quasar.

KW - BL Lacertae objects: general

KW - Galaxies: active

KW - Gamma rays: general

KW - X-rays: general

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U2 - 10.1051/0004-6361/201629028

DO - 10.1051/0004-6361/201629028

M3 - Article

AN - SCOPUS:84997822149

VL - 596

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

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Marchesini EJ, Masetti N, Chavushyan V, Cellone SA, Andruchow I, Bassani L y otros. Looking for blazars in a sample of unidentified high-energy emitting Fermi sources. Astronomy and Astrophysics. 2016 dic 1;596. A10. https://doi.org/10.1051/0004-6361/201629028