TeV candidate BL Lac objects

Costamante, L.; Ghisellini, G.

doi:10.1051/0004-6361:20011749

Cited by 235 publications

(309 citation statements)

References 75 publications

(70 reference statements)

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“…The discovery of this source as VHE γ-ray emitter demonstrates the importance of combining data at different wavelengths, namely radio, optical, X-ray, and the recently opened Fermi-LAT energy range, to help identify potential VHE γ-ray emitters. The MAGIC detection confirms the prediction made by Costamante & Ghisellini (2002) and Donato et al (2001) more than ten years ago, using X-ray, optical, and radio data. Of the 33 sources in the list they compiled, 21 have been already detected.…”

Section: Discussionsupporting

confidence: 87%

“…The BL Lac object 1ES 1727+502, which we discuss in this paper, is the latest in a long list of MAGIC discoveries of objects selected from X-ray catalogues (e.g. ), for 1ES 1727+502 Costamante & Ghisellini 2002, and for other sources, Donato et al 2001). Among those are 1ES 1218+30.4 (Albert et al 2006a), PG 1553+113 (Albert et al 2007a), 1ES 1741+196 ) and 1ES 0033+595 (Mariotti et al 2011).…”

Section: Introductionmentioning

confidence: 87%

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Discovery of very high energy gamma-ray emission from the blazar 1ES 1727+502 with the MAGIC Telescopes

Aleksić¹,

Antonelli²,

Antoranz³

et al. 2014

A&A

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Motivated by the prediction of a high TeV luminosity we investigated whether the blazar 1ES 1727+502 (z = 0.055) is emitting very high energy (VHE, E > 100 GeV) γ rays. We observed the BL Lac object 1ES 1727+502 in stereoscopic mode with the two MAGIC telescopes for 14 nights between May 6th and June 10th 2011, for a total effective observing time of 12.6 h. To study the multiwavelength spectral energy distribution (SED), we used simultaneous optical R-band data from the KVA telescope, archival UV/optical and X-ray observations from instruments UVOT and XRT on board of the Swift satellite, and high energy (HE, 0.1 GeV-100 GeV) γ-ray data from the Fermi-LAT instrument. We detected, for the first time, VHE γ-ray emission from 1ES 1727+502 at a statistical significance of 5.5σ. The integral flux above 150 GeV is estimated to be (2.1 ± 0.4)% of the Crab nebula flux and the de-absorbed VHE spectrum has a photon index of (2.7 ± 0.5). No significant short-term variability was found in any of the wavebands presented here. We model the SED using a one-zone synchrotron self-Compton model obtaining parameters typical for this class of sources.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 87%

Discovery of very high energy gamma-ray emission from the blazar 1ES 1727+502 with the MAGIC Telescopes

Aleksić¹,

Antonelli²,

Antoranz³

et al. 2014

A&A

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“…This catalogue specifically selected HBLs and thus presented an obvious choice for the extension of the list of VHE BL Lac candidates. 1RXS J101015.9−311909 also fulfilled the criteria proposed in Costamante & Ghisellini (2002), where BL Lac candidates are considered interesting targets if they exhibit high levels of both X-ray and radio emission.…”

Section: Introductionmentioning

confidence: 94%

Discovery of VHEγ-ray emission and multi-wavelength observations of the BL Lacertae object 1RXS J101015.9 − 311909

Abramowski¹,

Acero²,

Aharonian³

et al. 2012

A&A

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ABSTRACT1RXS J101015.9−311909 is a galaxy located at a redshift of z = 0.14 hosting an active nucleus (called AGN) belonging to the class of bright BL Lac objects. Observations at high (HE, E > 100 MeV) and very high (VHE, E > 100 GeV) energies provide insights into the origin of very energetic particles present in such sources and the radiation processes at work. We report on results from VHE observations performed between 2006 and 2010 with the H.E.S.S. instrument, an array of four imaging atmospheric Cherenkov telescopes. H.E.S.S. data have been analysed with enhanced analysis methods, making the detection of faint sources more significant. VHE emission at a position coincident with 1RXS J101015.9−311909 is detected with H.E.S.S. for the first time. In a total good-quality livetime of about 49 h, we measure 263 excess counts, corresponding to a significance of 7.1 standard deviations. The photon spectrum above 0.2 TeV can be described by a power-law with a photon index of Γ = 3.08 ± 0.42 stat ± 0.20 sys . The integral flux above 0.2 TeV is about 0.8% of the flux of the Crab nebula and shows no significant variability over the time reported. In addition, public Fermi/LAT data are analysed to search for high energy emission from the source. The Fermi/LAT HE emission in the 100 MeV to 200 GeV energy range is significant at 8.3 standard deviations in the chosen 25-month dataset. UV and X-ray contemporaneous observations with the Swift satellite in May 2007 are also reported, together with optical observations performed with the atom telescope located at the H.E.S.S. site. Swift observations reveal an absorbed X-ray flux of F (0.3−7) keV = 1.04 +0.04 −0.05 × 10 −11 erg cm −2 s −1 in the 0.3−7 keV range. Finally, all the available data are used to study the multi-wavelength properties of the source. The spectral energy distribution (SED) can be reproduced using a simple one-zone Synchrotron Self Compton (SSC) model with emission from a region with a Doppler factor of 30 and a magnetic field between 0.025 and 0.16 G. These parameters are similar to those obtained for other sources of this type.

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“…In Beckmann et al(2002) and Costamante & Ghisellini (2002), they also mention that the observed bolometric luminosity is thought to be well traced by the radio luminosity.…”

Section: Introductionmentioning

confidence: 98%

On estimators of the jet bolometric luminosity of Fermi 2LAC blazars

Wang

Xue

et al. 2017

Astrophys Space Sci

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Bolometric luminosity is a basic physical parameter that is widely used in the study of blazars. Due to the lack of simultaneous full wavelength data, several estimators of the bolometric luminosity are being used in practice. In this paper, we study and evaluate the reliability and significance of six estimators, the 5GHz luminosity, the 1keV luminosity, the γ-ray luminosity, the 5GHz luminosity+the 1keV luminosity, the 5GHz luminosity+the γ-ray luminosity and the 1keV luminosity+the γ-ray luminosity, by analyzing the linear correlations between the integrated bolometric luminosity and them. Our main results are as follows. (i) All the six estimators are reliable in the sense that they are all significant correlated with the bolometric luminosity. (ii) Ranking from the higher significance of the reliability to lower one the six estimators are the the 5GHz luminosity+the γ-ray luminosity, the 1keV luminosity+the γ-ray luminosity, γ-ray luminosity, the 5GHz luminosity+the 1keV luminosity, the 5GHz lu- Department of Physics, Yunnan Normal University, Kunming 650500, China † email:leiming du@ynao.ac.cn minosity and the 1keV luminosity. (iii) We suggest that the bolometric luminosity can be well estimated by the γ-ray luminosity using the best linear equation that given in this paper for Fermi FSRQs. (iv) According to the linear regressions obtained in the analysis, we provide calibration for each estimator.

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TeV candidate BL Lac objects

Cited by 235 publications

References 75 publications

Discovery of very high energy gamma-ray emission from the blazar 1ES 1727+502 with the MAGIC Telescopes

Discovery of very high energy gamma-ray emission from the blazar 1ES 1727+502 with the MAGIC Telescopes

Discovery of VHEγ-ray emission and multi-wavelength observations of the BL Lacertae object 1RXS J101015.9 − 311909

On estimators of the jet bolometric luminosity of Fermi 2LAC blazars

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