Identification of the Infrared Non-Thermal Emission in Blazars

Massaro, F.; D’Abrusco, R.; Ajello, M.; Grindlay, Jonathan E.; Smith, H. A.

doi:10.1088/2041-8205/740/2/l48

Cited by 171 publications

(225 citation statements)

References 14 publications

(27 reference statements)

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“…This source is also positionally well consistent with the IR counterpart AllWISE J194455.16−214319.2, detected in all the four bandpasses with the following magnitudes: µm colour-colour diagram is consistent with a High-synchrotron-peaked BL Lac (HBL) as described in Massaro et al (2011) for the TeV BL Lac objects.…”

Section: The Cluster Mst 1945−2143 / 2fhlsupporting

confidence: 80%

“…The advantage of MST is the capability to quickly find potential γ-ray sources by examining only the incoming directions of the photons, regardless of their energy distribution. In the specific application of MST to the γ-ray sky we defined (and successfully tested on simulated and real fields) various selection parameters, useful to assess the significance of the detected clusters and therefore their possible nature as genuine astrophysical sources (Campana et al 2008;Massaro et al 2009;Campana et al 2013). In particular, we found that the cluster magnitude M is a very good indicator of the detection significance; it is defined as M = ng, where n is the number of photons in a cluster, and g is the clustering degree, i.e.…”

Section: Mst Detection Of γ-Ray Clustersmentioning

confidence: 99%

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Two new high-energy γ-ray blazar candidates

Campana

Maselli

Bernieri

et al. 2016

Mon. Not. R. Astron. Soc.

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We report the detection of two new γ-ray sources in the Fermi-LAT sky (Pass 8) at energies higher than 20 GeV, and confirmed at lower energies, using a source detection tool based on the Minimum Spanning Tree algorithm. One of these sources, at a Galactic latitude of about −4 • , is a new discovery, while the other was previously reported above 50 GeV in the 2FHL catalogue. We searched for archival multi-wavelength data of possible counterparts and found interesting candidates. Both objects are radio sources and their WISE infrared colours are typical of blazars. While for the former source no optical spectra are available, for the latter a puzzling optical spectrum corresponding to a white dwarf star is found in the 6dF database. We discuss the spectral energy distributions of both sources and possible interpretations.

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Section: The Cluster Mst 1945−2143 / 2fhlsupporting

confidence: 80%

Section: Mst Detection Of γ-Ray Clustersmentioning

confidence: 99%

Two new high-energy γ-ray blazar candidates

Campana

Maselli

Bernieri

et al. 2016

Mon. Not. R. Astron. Soc.

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“…The BL Lac contribution considered together with that arising from other γ-ray emitters as for example radiogalaxies (see e.g. Inoue 2011; Massaro & Ajello 2011b;Di Mauro et al 2014) and/or star forming galaxies (see e.g., Ackermann et al 2012a) could help searching for a potential dark matter signature in the EGB spectrum (Ackermann et al 2015a, Di Mauro & Donato 2015, Fermi Collaboration 2015. Moreover optical spectroscopic campaign are also useful to obtain new redshifts necessary to estimate the imprint of the extragalactic background light in their spectra (see e.g., Ackermann et al 2012b).…”

Section: Future Perspectivesmentioning

confidence: 99%

“…Using the WISE all-sky survey (Wright et al 2010), we showed that in the IR color-color diagrams the γ-ray blazars, dominated by non-thermal emission, lie in a distinct region well separated from that occupied by other extragalactic sources (Massaro et al 2011a;D'Abrusco et al 2012;Massaro & D'Abrusco 2016). On the basis of this discovery, we built new procedures to recognize γ-ray blazar candidates lying within the positional uncertainty regions of the UGSs Massaro et al 2013b;D'Abrusco et al 2014).…”

mentioning

confidence: 95%

The gamma-ray blazar quest: new optical spectra, state of art and future perspectives

Massaro

Crespo

D’Abrusco³

et al. 2016

Astrophys Space Sci

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We recently developed a procedure to recognize γ-ray blazar candidates within the positional uncertainty regions of the unidentified/unassociated γ-ray sources (UGSs). Such procedure was based on the discovery that Fermi blazars show peculiar infrared colors. However, to confirm the real nature of the selected candidates, optical spectroscopic data are necessary. Thus, we performed an extensive archival search for spectra available in the literature in parallel with an optical spectroscopic campaign aimed to reveal and confirm the nature of the selected γ-ray blazar candidates. Here, we first search for optical spectra of a selected sample of γ-ray blazar candidates that can be potential counterparts of UGSs using the Sloan Digital Sky Survey (SDSS DR12). This search enables us to update the archival search carried out to date. We also describe the state-of-art and the future perspectives of our campaign to discover previously unknown γ-ray blazars.

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“…New, complementary approaches to the blazar classification come from the evaluation of their color indices in the infrared (Massaro et al 2011b) as well as in the optical-UV bands . The discovery of peculiar infrared colors of γ-ray emitting 1 http://www.asdc.asi.it/bzcat4/ blazars led to the parametrization of the region that they occupy in the color space of the Wide-field Infrared Survey Explorer (WISE, Wright et al 2010), named the WISE blazar locus ).…”

Section: Introductionmentioning

confidence: 99%

New blazars from the cross-match of recent multi-frequency catalogs

Maselli

Massaro

D’Abrusco

et al. 2015

Astrophys Space Sci

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Blazars are radio-loud active galactic nuclei well known for their non thermal emission spanning a wide range of frequencies. The Roma-BZCAT is, to date, the most comprehensive list of these sources. We performed the cross-match of several catalogs obtained from recent surveys at different frequencies to search for new blazars. We cross-matched the 1 st Swift XRT Point Source catalog with the spectroscopic sample of the 9 th Data Release of the Sloan Digital Sky Survey. Then, we performed further cross-matches with the catalogs corresponding to the Faint Images of the Radio Sky at Twenty cm survey and to the AllWISE Data re- lease, focusing on sources with infrared colors similar to those of confirmed γ-ray blazars included in the Second Fermi-LAT catalog. As a result, we obtained a preliminary list of objects with all the elements needed for a proper blazar classification according to the prescriptions of the Roma-BZCAT. We carefully investigated additional properties such as their morphology and the slope of their spectral energy distribution in the radio domain, the features shown in their optical spectrum, and the luminosity in the soft X rays to exclude generic active galactic nuclei and focus on authentic blazar-like sources. At the end of our screening we obtained a list of 15 objects with firmly established blazar properties.

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Identification of the Infrared Non-Thermal Emission in Blazars

Cited by 171 publications

References 14 publications

Two new high-energy γ-ray blazar candidates

Two new high-energy γ-ray blazar candidates

The gamma-ray blazar quest: new optical spectra, state of art and future perspectives

New blazars from the cross-match of recent multi-frequency catalogs

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