Multiwavelength Observations of the Previously Unidentified Blazar Rx J0648.7+1516

Aliu, E.; Aune, T.; Beilicke, M.; Benbow, W.; Böttcher, M.; Bouvier, A.; Bradbury, S. M.; Buckley, J. H.; Bugaev, V.; Cannon, A.; Cesarini, A.; Ciupik, L.; Connolly, Michael; Cui, Wei; Decerprit, G.; Dickherber, R.; Duke, C.; Errando, M.; Falcone, A.; Feng, Q.; Finnegan, G.; Fortson, L.; Furniss, A.; Galante, N.; Gall, D.; Gillanders, G. H.; Godambe, S.; Griffin, S.; Grube, J.; Gyuk, G.; Hanna, D.; Hivick, B.; Holder, J.; Huan, Hao; Hughes, G.; Hui, C. M.; Humensky, T. B.; Kaaret, P.; Karlsson, N.; Kertzman, M.; Kieda, D.; Krawczynski, H.; Krennrich, F.; Maier, G.; Majumdar, P.; McArthur, S.; McCann, A.; Moriarty, P.; Mukherjee, R.; Nelson, Thomas; Ong, R. A.; Orr, M.; Otte, A. N.; Park, N.; Perkins, J. S.; Pichel, A.; Pohl, M.; Prokoph, H.; Quinn, J.; Ragan, K.; Reyes, Luis; Reynolds, P. T.; Roache, E.; Rose, H. J.; Ruppel, J.; Saxon, D. B.; Sembroski, G. H.; Skole, C.; Smith, A. W.; Staszak, D.; Tešić, G.; Theiling, M.; Thibadeau, S.; Tsurusaki, K.; Tyler, J.; Varlotta, A.; Vassiliev, V. V.; Wakely, S. P.; Weekes, T. C.; Weinstein, A. J.R.; Williams, D. A.; Zitzer, B.; Ciprini, S.; Fumagalli, Michele; Kaplan, Kyle; Paneque, D.; Prochaska, J. Xavier

doi:10.1088/0004-637x/742/2/127

Cited by 37 publications

(19 citation statements)

References 29 publications

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“…It is worth noting that our results concerning 1FGL J0648.8+1516 (in Table 3) are consistent with those of Aliu et al (2011); moreover, eight of the BL Lac objects in our sample (indicated with an asterisk in Table 2) are also present in the large sample of BL Lac spectra published by Shaw et al (2013).…”

Section: Resultssupporting

confidence: 88%

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BL Lacertae identifications in a ROSAT-selected sample ofFermiunidentified objects

Masetti

Sbarufatti

Parisi

et al. 2013

A&A

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The optical spectroscopic followup of 27 sources belonging to a sample of 30 high-energy objects selected by positionally cross correlating the first Fermi/LAT Catalog and the ROSAT All-Sky Survey Bright Source Catalog is presented here. It has been found or confirmed that 25 of them are BL Lacertae objects (BL Lacs), while the remaining two are Galactic cataclysmic variables (CVs). This strongly suggests that the sources in the first group are responsible for the GeV emission detected with Fermi, while the two CVs most likely represent spurious associations. We thus find an 80% a posteriori probability that the sources selected by matching GeV and X-ray catalogs belong to the BL Lac class. We also show suggestions that the BL Lacs selected with this approach are probably high-synchrotron-peaked sources and in turn good candidates for the detection of ultra-high-energy (TeV) photons from them.

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Section: Resultssupporting

confidence: 88%

“…One of the sources in our sample, 1FGL J0648.8+1516, has been detected up to the TeV range (Aliu et al 2011); it is also among the ones with the largest Table 2 on the α ox -α ro plane. The thick solid line indicates the region described in Sect.…”

Section: Discussionmentioning

confidence: 79%

BL Lacertae identifications in a ROSAT-selected sample ofFermiunidentified objects

Masetti

Sbarufatti

Parisi

et al. 2013

A&A

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“…The broadband spectral data were modeled with an equilibrium version of the single-zone SSC model from Böttcher & Chiang (2002) and Böttcher et al (2013). This model has been used to describe the broadband emission from various other VHE-detected blazars (e.g., Acciari et al 2009a;Abdo et al 2011b;Aliu et al 2011Aliu et al , 2013.…”

Section: Modeling the Broadband Sedmentioning

confidence: 99%

“…The sub-equipartition magnetic fields that are often found in blazar SED modeling might therefore favor this latter scenario. Sub-equipartition states are a common result in the application of single-zone SSC emission scenarios to VHE blazars, as in Aliu et al (2011Aliu et al ( , 2012aAliu et al ( , 2012b, Acciari et al (2008bAcciari et al ( , 2009aAcciari et al ( , 2009bAcciari et al ( , 2009c and Abdo et al (2011c).…”

Section: Modeling the Broadband Sedmentioning

confidence: 99%

FIRSTNuSTAROBSERVATIONS OF MRK 501 WITHIN A RADIO TO TeV MULTI-INSTRUMENT CAMPAIGN

Furniss

Noda

Boggs

et al. 2015

ApJ

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We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 2013 April 1 and August 10, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign, the nearby BL Lac object was observed in both a quiescent and an elevated state. The broadband campaign includes observations with NuSTAR, MAGIC, VERITAS, the Fermi Large Area Telescope, Swift X-ray Telescope and UV Optical Telescope, various ground-based optical instruments, including the GASP-WEBT program, as well as radio observations by OVRO, Metsähovi, and the F-Gamma consortium. Some of the MAGIC observations were affected by a sand layer from the Saharan desert, and had to be corrected using eventby-event corrections derived with a Light Detection and Ranging (LIDAR) facility. This is the first time that LIDAR information is used to produce a physics result with Cherenkov Telescope data taken during adverse atmospheric conditions, and hence sets a precedent for the current and future ground-based gamma-ray instruments. The NuSTAR instrument provides unprecedented sensitivity in hard X-rays, showing the source to display a spectral energy distribution (SED) between 3 and 79 keV consistent with a log-parabolic spectrum and hard X-ray variability on hour timescales. None (of the four extended NuSTAR observations) show evidence of the onset of inverse-Compton emission at hard X-ray energies. We apply a single-zone equilibrium synchrotron selfCompton (SSC) model to five simultaneous broadband SEDs. We find that the SSC model can reproduce the observed broadband states through a decrease in the magnetic field strength coinciding with an increase in the luminosity and hardness of the relativistic leptons responsible for the high-energy emission.

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“…In practice, these fits do not allow for the presence of additional gas in the blazar host galaxy. There have, however, been a limited number of blazars which, when fit with an absorbed power-law model with a free column density, show a fitted value in excess to that measured in the Milky Way (e.g., Aliu et al 2011Aliu et al , 2012. However, some ambiguity in the interpretation of the data remain.…”

Section: Introductionmentioning

confidence: 99%

The Blazar Emission Environment: Insight From Soft X-Ray Absorption

Furniss

Fumagalli

Falcone

et al. 2013

ApJ

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Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACT Collecting experimental insight into the relativistic particle populations and emission mechanisms at work within TeV-emitting blazar jets, which are spatially unresolvable in most bands and have strong beaming factors, is a daunting task. New observational information has the potential to lead to major strides in understanding the acceleration site parameters. Detection of molecular carbon monoxide (CO) in TeV emitting blazars, however, implies the existence of intrinsic gas, a connection often found in photo-dissociated region models and numerical simulations. The existence of intrinsic gas within a blazar could provide a target photon field for Compton upscattering of photons to TeV energies by relativistic particles. We investigate the possible existence of intrinsic gas within the three TeV emitting blazars RGB J0710+591, W Comae, and 1ES 1959+650 which have measurements or upper limits on molecular CO line luminosity using an independent technique that is based on the spectral analysis of soft X-rays. Evidence for X-ray absorption by additional gas beyond that measured within the Milky Way is searched for in Swift X-ray Telescope (XRT) data between 0.3 and 10 keV. Without complementary information from another measurement, additional absorption could be misinterpreted as an intrinsically curved X-ray spectrum since both models can frequently fit the soft X-ray data. After breaking this degeneracy, we do not find evidence for intrinsically curved spectra for any of the three blazars. Moreover, no evidence for intrinsic gas is evident for RGB J0710+591 and W Comae, while the 1ES 1959+650 XRT data support the existence of intrinsic gas with a column density of ∼1 × 10 21 cm −2 . THE BLAZAR EMISSION ENVIRONMENT: INSIGHT FROM SOFT X-RAY ABSORPTION

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Multiwavelength Observations of the Previously Unidentified Blazar Rx J0648.7+1516

Cited by 37 publications

References 29 publications

BL Lacertae identifications in a ROSAT-selected sample ofFermiunidentified objects

BL Lacertae identifications in a ROSAT-selected sample ofFermiunidentified objects

FIRSTNuSTAROBSERVATIONS OF MRK 501 WITHIN A RADIO TO TeV MULTI-INSTRUMENT CAMPAIGN

The Blazar Emission Environment: Insight From Soft X-Ray Absorption

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