SEARCHING FOR NEW γ-RAY BLAZAR CANDIDATES IN THE THIRD PALERMO BAT HARD X-RAY CATALOG WITH
                    <i>WISE</i>

Maselli, A.; Massaro, F.; Cusumano, G.; D’Abrusco, R.; Parola, V. La; Paggi, A.; Segreto, A.; Smith, H. A.; Tosti, G.

doi:10.1088/0067-0049/206/2/17

Cited by 20 publications

(18 citation statements)

References 58 publications

(68 reference statements)

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“…In addition, we also adopted the criterion developed by Massaro et al (2013c) to classify BL Lac object based on the SDSS (u-r) color, that supersedes the one based on the Ca H&K break contrast originally introduced by Stoke et al (1991). Thus, for each source, we computed the absorption corrected (ur) color equal to (u − r) obs − 0.81 * A r , where A r is the Galactic extinction in the R band, and we considered BL Lac objects only those sources with (u−r) < 1.4 (see also Maselli et al 2013). We assign a BZB classification only to sources having both a "featureless" spectra and the (u − r) color lower than 1.4.…”

Section: Resultsmentioning

confidence: 99%

OPTICAL SPECTROSCOPIC OBSERVATIONS OF BLAZARS AND Γ-Ray BLAZAR CANDIDATES IN THE SLOAN DIGITAL SKY SURVEY DATA RELEASE NINE

Massaro¹,

Masetti²,

D’Abrusco³

et al. 2014

The Astronomical Journal

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We present an analysis of the optical spectra available in the Sloan Digital Sky survey data release nine (SDSS DR9) for the blazars listed in the ROMA-BZCAT and for the γ-ray blazar candidates selected according to their IR colors. First, we adopt a statistical approach based on MonteCarlo simulations to find the optical counterparts of the blazarslisted in the ROMA-BZCAT catalog. Then we crossmatched the SDSS spectroscopic catalog with our selected samples of blazars and γ-ray blazar candidates searching for those with optical spectra available to classify our blazar-like sources and, whenever possible, to confirm their redshifts. Our main objectives are determining the classification of uncertain blazars listed in the ROMA-BZCAT and discovering new gamma-ray blazars. For the ROMA-BZCAT sources we investigated a sample of 84 blazars confirming the classification for 20 of them and obtaining 18 new redshift estimates. For the γ-ray blazars, indicated as potential counterparts of unassociated Fermi sources or with uncertain nature, we established the blazar-like nature of 8 out the 27 sources analyzed and confirmed 14 classifications.

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Section: Resultsmentioning

confidence: 99%

OPTICAL SPECTROSCOPIC OBSERVATIONS OF BLAZARS AND Γ-Ray BLAZAR CANDIDATES IN THE SLOAN DIGITAL SKY SURVEY DATA RELEASE NINE

Massaro¹,

Masetti²,

D’Abrusco³

et al. 2014

The Astronomical Journal

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“…Moreover, Maselli et al (2013) have used WISE candidate γ-ray emitting blazars to associate 24 unidentified…”

Section: Discussionmentioning

confidence: 99%

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

D’Abrusco

Massaro

Paggi

et al. 2014

ApJS

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134

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We present a catalog of radio-loud candidate γ-ray emitting blazars with WISE mid-infrared colors similar to the colors of confirmed γ-ray blazars. The catalog is assembled from WISE sources detected in all four WISE filters, with colors compatible with the three-dimensional locus of the WISE γ-ray emitting blazars, and which can be spatially cross-matched with radio sources from either one of the three radio surveys: NVSS, FIRST and/or SUMSS. Our initial WISE selection uses a slightly modified version of previously successful algorithms. We then select only the radio-loud sources using a measure of the radio-to-IR flux, the q 22 parameter, which is analogous to the q 24 parameter known in the literature but which instead uses the WISE band-four flux at 22 µm. Our final catalog contains 7855 sources classified as BL Lacs, FSRQs or mixed candidate blazars; 1295 of these sources can be spatially re-associated with confirmed blazars. We describe the properties of the final catalog of WISE blazar-like radio-loud sources and consider possible contaminants. Finally, we discuss why this large catalog of candidate γ-ray emitting blazars represents a new and useful resource to address the problem of finding low energy counterparts to currently unidentified high-energy sources.

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“…We flagged all blazars in our sample according to the latest release (5.0.0; Massaro et al 2015) of the Roma BZCAT 26 catalog (Massaro et al 2009) and using the results of recent works on BAT-detected blazars (Ajello et al 2009;Maselli et al 2013). Overall 105 objects are classified as blazars.…”

Section: Samplementioning

confidence: 99%

BAT AGN Spectroscopic Survey. V. X-Ray Properties of the Swift /BAT 70-month AGN Catalog

Ricci

Trakhtenbrot

Koss

et al. 2017

ApJS

457

719

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Hard X-ray (10 keV) observations of active galactic nuclei (AGNs) can shed light on some of the most obscured episodes of accretion onto supermassive black holes. The 70-month Swift/BAT all-sky survey, which probes the 14-195 keV energy range, has currently detected 838 AGNs. We report here on the broadband X-ray (0.3-150 keV) characteristics of these AGNs, obtained by combining XMM-Newton, Swift/XRT, ASCA, Chandra, and Suzaku observations in the soft X-ray band ( 10  keV) with 70-month averaged Swift/BAT data. The nonblazar AGNs of our sample are almost equally divided into unobscured (N 10 cm H 22 2 < -) and obscured (N 10 cm H 22 2  -) AGNs, and their Swift/BAT continuum is systematically steeper than the 0.3-10 keV emission, which suggests that the presence of a high-energy cutoff is almost ubiquitous. We discuss the main X-ray spectral parameters obtained, such as the photon index, the reflection parameter, the energy of the cutoff, neutral and ionized absorbers, and the soft excess for both obscured and unobscured AGNs.

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SEARCHING FOR NEW γ-RAY BLAZAR CANDIDATES IN THE THIRD PALERMO BAT HARD X-RAY CATALOG WITH WISE

Cited by 20 publications

References 58 publications

OPTICAL SPECTROSCOPIC OBSERVATIONS OF BLAZARS AND Γ-Ray BLAZAR CANDIDATES IN THE SLOAN DIGITAL SKY SURVEY DATA RELEASE NINE

OPTICAL SPECTROSCOPIC OBSERVATIONS OF BLAZARS AND Γ-Ray BLAZAR CANDIDATES IN THE SLOAN DIGITAL SKY SURVEY DATA RELEASE NINE

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

BAT AGN Spectroscopic Survey. V. X-Ray Properties of the Swift /BAT 70-month AGN Catalog

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