On the Radio and Near-Infrared Jet of PKS 2155–304 and Its Close Environment

Liuzzo, E.; Falomo, R.; Treves, A.; Arcidiacono, Carmelo; Torresi, E.; Uslenghi, M.; Farinato, Jacopo; Moretti, Alessia; Ragazzoni, Roberto; Diolaiti, Emiliano; Lombini, Matteo; Brast, R.; Donaldson, Rob; Kolb, Johann; Marchetti, Enrico; Tordo, Sebastien

doi:10.1088/0004-6256/145/3/73

Cited by 6 publications

(7 citation statements)

References 34 publications

(53 reference statements)

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“…Optical imaging of the field of PKS 2155-304 revealed the presence of a moderated overdensity of galaxies (Falomo et al 1991;Falomo, Pesce, & Treves 1993;Wurtz et al 1997). This finding is corroborated by the detection in high-resolution NIR images of 5 galaxies located within ∼20 ′′ (∼40 kpc at z=0.116) from PKS 2155-304 (Liuzzo et al 2013) and by spectroscopic observations of some of the sources (Falomo et al 1991;Falomo, Pesce, & Treves 1993). We here present a comprehensive study of the field of PKS 2155-304 using new spectra gathered with the Magellan Telescope and archival data from Prochaska et al (2011).…”

Section: Introductionsupporting

confidence: 69%

“…In addition to multi-object spectroscopy, we acquired a long-slit spectrum of the two closest galaxies to PKS 2155-304 (i.e., G1 and G5; Falomo, Pesce, & Treves 1993;Liuzzo et al 2013). Data were gathered during the same night of the multi-object spectroscopy with a seeing of ∼0.…”

Section: Long-slit Spectroscopymentioning

confidence: 99%

“…This corresponds to prioritise for bright elliptical galaxies, that are expected to be the dominant population of a putative low redshift cluster. In addition to this list of targets we considered also the four galaxies G1, G2, G5, and G6 (following the labels assigned by Treves 1993 andLiuzzo et al 2013) observed in high resolution NIR images by Liuzzo et al (2013). These sources are positioned at less than ∼20 ′′ from PKS 2155-304 and we assigned them a priority of 1.…”

Section: Multi-object Spectroscopymentioning

confidence: 99%

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The cluster-scale environment of PKS 2155−304

Farina

Fumagalli

Decarli

et al. 2015

Mon. Not. R. Astron. Soc.

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PKS 2155-304 is one of the brightest extragalactic source in the X-ray and EUV bands, and is a prototype for the BL Lac class of objects. In this paper we investigate the large-scale environment of this source using new multi-object as well as longslit spectroscopy, together with archival spectra and optical images. We find clear evidence of a modest overdensity of galaxies at z = 0.11610 ± 0.00006, consistent with previous determinations of the BL Lac redshift. The galaxy group has a radial velocity dispersion of 250 +80 −40 km s −1 and a virial radius of 0.22 Mpc, yielding a role-of-thumb estimate of the virial mass of M vir ∼1.5×10 13 M ⊙ , i.e., one order of magnitude less than what observed in other similar objects. This result hints toward a relatively wide diversity in the environmental properties of BL Lac objects.

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Section: Introductionsupporting

confidence: 69%

Section: Long-slit Spectroscopymentioning

confidence: 99%

Section: Multi-object Spectroscopymentioning

confidence: 99%

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The cluster-scale environment of PKS 2155−304

Farina

Fumagalli

Decarli

et al. 2015

Mon. Not. R. Astron. Soc.

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“…The grey points are the data from the 2008 observation campaign (Aharonian et al 2009) shown for comparison. Black points are the radio data from Abdo et al (2010) and Liuzzo et al (2013). The dashed blue line is the synchrotron emission and the orange line is the IC emission.…”

Section: Broad-band X-ray Spectrummentioning

confidence: 98%

“…The modelling was performed on the epochs presented in this work (1-5) with UV, X-ray, GeV, and TeV data. Radio data from Abdo et al (2010) and Liuzzo et al (2013) were taken from the NED 10 . The radio emission could originate from another location in the jet, or from the emission zone, and is therefore considered as an upper limit in the model.…”

Section: Leptonic Modelling: One Zone Synchrotron Self-comptonmentioning

confidence: 99%

Simultaneous observations of the blazar PKS 2155−304 from ultra-violet to TeV energies

Abdalla

Adam

Aharonian

et al. 2020

A&A

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Here we report the results of the first ever contemporaneous multi-wavelength observation campaign on the BL Lac object PKS 2155−304 involving Swift, NuSTAR, Fermi-LAT, and H.E.S.S. The use of these instruments allows us to cover a broad energy range, which is important for disentangling the different radiative mechanisms. The source, observed from June 2013 to October 2013, was found in a low flux state with respect to previous observations but exhibited highly significant flux variability in the X-rays. The high-energy end of the synchrotron spectrum can be traced up to 40 keV without significant contamination by high-energy emission. A one-zone synchrotron self-Compton model was used to reproduce the broadband flux of the source for all the observations presented here but failed for previous observations made in April 2013. A lepto-hadronic solution was then explored to explain these earlier observational results.

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Soft γ-ray selected radio galaxies: favouring giant size discovery

Bassani¹,

Venturi²,

Molina³

et al. 2016

Mon. Not. R. Astron. Soc.

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Using the recent INTEGRAL/IBIS and Swift/BAT surveys we have extracted a sample of 64 confirmed plus 3 candidate radio galaxies selected in the soft gamma-ray band. The sample covers all optical classes and is dominated by objects showing a FR II radio morphology; a large fraction (70%) of the sample is made of "radiative mode" or High Excitation Radio Galaxies (HERG). We have measured the source size on NVSS, FIRST and SUMSS images and have compared our findings with data in the literature obtaining a good match. We surprisingly found that the soft gamma-ray selection favours the detection of large size radio galaxies: 60% of objects in the sample have size greater than 0.4 Mpc while around 22% reach dimension above 0.7 Mpc at which point they are classified as Giant Radio Galaxies or GRGs, the largest and most energetic single entities in the Universe. Their fraction among soft gamma ray selected radio galaxies is significantly larger than typically found in radio surveys, where only a few percent of objects (1-6%) are GRGs. This may partly be due to observational biases affecting radio surveys more than soft gamma ray surveys, thus disfavouring the detection of GRGs at lower frequencies. The main reasons and/or conditions leading to the formation of these large radio structures are still unclear with many parameters such as high jet power, long activity time and surrounding environment all playing a role; the first two may be linked to the type of AGN discussed in this work and partly explain the high fraction of GRGs found in the present sample. Our result suggests that high energy surveys may be a more efficient way than radio surveys to find these peculiar objects.

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On the Radio and Near-Infrared Jet of PKS 2155–304 and Its Close Environment

Cited by 6 publications

References 34 publications

The cluster-scale environment of PKS 2155−304

The cluster-scale environment of PKS 2155−304

Simultaneous observations of the blazar PKS 2155−304 from ultra-violet to TeV energies

Soft γ-ray selected radio galaxies: favouring giant size discovery

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