THE
                    <i>WISE</i>
                    BLAZAR-LIKE RADIO-LOUD SOURCES: AN ALL-SKY CATALOG OF CANDIDATE γ-RAY BLAZARS

D’Abrusco, R.; Massaro, F.; Paggi, A.; Smith, H. A.; Masetti, N.; Landoni, M.; Tosti, G.

doi:10.1088/0067-0049/215/1/14

Cited by 135 publications

(88 citation statements)

References 45 publications

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“…The separation between the mid-IR colors of the Fermi blazars and that of other sources randomly chosen appears evident. The presence of BZBs in the region of the "WISE Gamma-ray Strip" occupied by the BZQs is only limited to a handful of sources (see e.g., D 'Abrusco et al 2013;D'Abrusco et al 2014, for more details). The dashed polygon marks the region used to select potential RWBLs.…”

Section: Bzbs Wds and Welqs At Mid-ir Wavelengthsmentioning

confidence: 99%

RADIO-WEAK BL LAC OBJECTS IN THEFERMIERA

Massaro

Marchesini

D’Abrusco

et al. 2017

ApJ

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The existence of "radio weak BL Lac objects" (RWBLs) has been an open question, still unsolved, since the discovery that quasars could be radio-quiet or radio-loud. Recently several groups identified RWBL candidates, mostly found while searching for low energy counterparts of the unidentified/unassociated gamma-ray sources listed in the Fermi catalogs. Confirming RWBLs is a challenging task since they could be confused with white dwarfs or weak emission line quasars when there are not sufficient data to precisely draw their broad band spectral energy distribution and their classification is mainly based on a featureless optical spectra. Motivated by the recent discovery that Fermi BL Lacs appear to have very peculiar mid-IR emission, we show that it is possible to distinguish between WDs, WELQs and BL Lacs using the [3.4]-[4.6]-[12]µm color-color plot built using the WISE magnitudes when the optical spectrum is available. On the basis of this analysis, we identify WISE J064459.38+603131 and WISE J141046.00+740511.2 as the first two genuine RWBLs, both potentially associated with Fermi sources. Finally, to strengthen our identification of these objects as true RWBLs, we present multifrequency observations for these two candidates to show that their spectral behavior is indeed consistent with those of the BL Lac population.

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Section: Bzbs Wds and Welqs At Mid-ir Wavelengthsmentioning

confidence: 99%

RADIO-WEAK BL LAC OBJECTS IN THEFERMIERA

Massaro

Marchesini

D’Abrusco

et al. 2017

ApJ

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“…A compact radio core is detected. This radio galaxy has been previously classified as a possible BL Lac object (D'Abrusco et al 2014).…”

Section: Notes On Candidate Hymorsmentioning

confidence: 99%

Radio Galaxy Zoo: A Search for Hybrid Morphology Radio Galaxies

Kapińska

Terentev²,

Wong

et al. 2017

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Hybrid morphology radio sources (HyMoRS) are a rare type of radio galaxy that display different Fanaroff-Riley classes on opposite sides of their nuclei. To enhance the statistical analysis of HyMoRS, we embarked on a largescale search of these sources within the international citizen science project, Radio Galaxy Zoo (RGZ). Here, we present 25 new candidate hybrid morphology radio galaxies. Our selected candidates are moderate power radio galaxies (L 4.7 10 median 24=´W Hz −1 sr −1 ) at redshifts z 0.14 1.0 < < . Hosts of nine candidates have spectroscopic observations, of which six are classified as quasars, one as high-and two as low-excitation galaxies. Two candidate HyMoRS are giant ( 1 > Mpc) radio galaxies, one resides at the center of a galaxy cluster, and one is hosted by a rare green bean galaxy. Although the origin of the hybrid morphology radio galaxies is still unclear, this type of radio source starts depicting itself as a rather diverse class. We discuss hybrid radio morphology formation in terms of the radio source environment (nurture) and intrinsically occurring phenomena (nature; activity cessation and amplification), showing that these peculiar radio galaxies can be formed by both mechanisms. While high angular resolution follow-up observations are still necessary to confirm our candidates, we demonstrate the efficacy of the RGZ in the pre-selection of these sources from all-sky radio surveys, and report the reliability of citizen scientists in identifying and classifying complex radio sources.

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“…Several sources were already reported as blazar candidates in WIBRaLS (D'Abrusco et al 2014, marked as WBR in the following Table 2) or as QSO by Brescia et al (2015, B15 in Table 2), or their flat radio spectrum was confirmed by low frequency data Massaro et al (2014, M14 in Table 2); one is in the 1WHSP sample (1WH in Table 2), but not reported in Paper II because the cluster has 5 photons, lower than the minimum number considered in that paper. Only for one source we found a possible correspondence with a high energy source reported in the 3EG catalogue (Hartman et al 1999), but up to now undetected in the Fermi sky.…”

Section: Mstmentioning

confidence: 99%

Application of the MST clustering to the high energy γ $\gamma $ -ray sky. IV—Blazar candidates found as possible counterparts of photon clusters

Campana

Massaro

Bernieri

2016

Astrophys Space Sci

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We present the results of a cluster search in the Fermi -LAT Pass 8 γ-ray sky by means of the Minimum Spanning Tree algorithm, at energies higher than 10 GeV and at Galactic latitudes higher than 25• . The selected clusters have a minimum number of photons higher than or equal to 5, a high degree of concentration, and are without a clear corresponding counterpart in blazar catalogues. A sample of 30 possible γ-ray sources was obtained. These objects were verified by applying the standard Maximum Likelihood analysis on the Fermi -LAT data. A search for possible radio counterparts in a circle having a radius of 6 was performed, finding several interesting objects, the majority of them without optical spectroscopical data. These can be considered as new blazar candidates. Some of them were already noticed as possible blazars or Active Galactic Nuclei in previous surveys, but never associated with high energy emission. These possible counterparts are reported and their properties are discussed.

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THE WISE BLAZAR-LIKE RADIO-LOUD SOURCES: AN ALL-SKY CATALOG OF CANDIDATE γ-RAY BLAZARS

Cited by 135 publications

References 45 publications

RADIO-WEAK BL LAC OBJECTS IN THEFERMIERA

RADIO-WEAK BL LAC OBJECTS IN THEFERMIERA

Radio Galaxy Zoo: A Search for Hybrid Morphology Radio Galaxies

Application of the MST clustering to the high energy γ $\gamma $ -ray sky. IV—Blazar candidates found as possible counterparts of photon clusters

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