Optical observations of PSR J2021+3651 in the dragonfly nebula with the GTC

Aida Kirichenko, Andrey Danilenko, Peter Shternin, Yuriy Shibanov, Elizaveta Ryspaeva, Dima Zyuzin, Martin Durant, Oleg Kargaltsev, George Pavlov, Antonio Cabrera-Lavers

Research output: Contribution to journalArticle

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Abstract

PSR J2021+3651 is a 17 kyr old rotation powered pulsar detected in the radio, X-rays, and γ-rays. It powers a torus-like pulsar wind nebula with jets, dubbed the Dragonfly, which is very similar to that of the Vela pulsar. The Dragonfly is likely associated with the extended TeV source VER J2019+368 and extended radio emission. We conducted first deep optical observations with the Gran Telescopio Canarias in the Sloan r′ band to search for optical counterparts of the pulsar and its nebula. No counterparts were detected down to r′ 27.2 and 24. 8 for the point-like pulsar and the compact X-ray nebula, respectively. We also reanalyzed Chandra archival X-ray data taking into account an interstellar extinction-distance relation, constructed by us for the Dragonfly line of sight using the red-clump stars as standard candles. This allowed us to constrain the distance to the pulsar, kpc at 90% confidence. It is much smaller than the dispersion measure distance of ∼ 12 kpc but compatible with a γ-ray "pseudo-distance" of 1 kpc. Based on that and the optical upper limits, we conclude that PSR J2021+3651, similar to the Vela pulsar, is a very inefficient nonthermal emitter in the optical and X-rays, while its γ-ray efficiency is consistent with an average efficiency for γ-pulsars of similar age. Our optical flux upper limit for the pulsar is consistent with the long-wavelength extrapolation of its X-ray spectrum while the nebula flux upper limit does not constrain the respective extrapolation.

Original languageEnglish (US)
Article number17
JournalAstrophysical Journal
Volume802
Issue number1
DOIs
StatePublished - Mar 20 2015

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dragonfly
nebulae
pulsars
radio
rays
x rays
extrapolation
extinction
interstellar extinction
wavelength
clumps
radio emission
line of sight
confidence
emitters
stars

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kirichenko, A., Danilenko, A., Shternin, P., Shibanov, Y., Ryspaeva, E., Zyuzin, D., ... Cabrera-Lavers, A. (2015). Optical observations of PSR J2021+3651 in the dragonfly nebula with the GTC. Astrophysical Journal, 802(1), [17]. https://doi.org/10.1088/0004-637X/802/1/17
Kirichenko, Aida ; Danilenko, Andrey ; Shternin, Peter ; Shibanov, Yuriy ; Ryspaeva, Elizaveta ; Zyuzin, Dima ; Durant, Martin ; Kargaltsev, Oleg ; Pavlov, George ; Cabrera-Lavers, Antonio. / Optical observations of PSR J2021+3651 in the dragonfly nebula with the GTC. In: Astrophysical Journal. 2015 ; Vol. 802, No. 1.
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Kirichenko, A, Danilenko, A, Shternin, P, Shibanov, Y, Ryspaeva, E, Zyuzin, D, Durant, M, Kargaltsev, O, Pavlov, G & Cabrera-Lavers, A 2015, 'Optical observations of PSR J2021+3651 in the dragonfly nebula with the GTC', Astrophysical Journal, vol. 802, no. 1, 17. https://doi.org/10.1088/0004-637X/802/1/17

Optical observations of PSR J2021+3651 in the dragonfly nebula with the GTC. / Kirichenko, Aida; Danilenko, Andrey; Shternin, Peter; Shibanov, Yuriy; Ryspaeva, Elizaveta; Zyuzin, Dima; Durant, Martin; Kargaltsev, Oleg; Pavlov, George; Cabrera-Lavers, Antonio.

In: Astrophysical Journal, Vol. 802, No. 1, 17, 20.03.2015.

Research output: Contribution to journalArticle

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T1 - Optical observations of PSR J2021+3651 in the dragonfly nebula with the GTC

AU - Kirichenko, Aida

AU - Danilenko, Andrey

AU - Shternin, Peter

AU - Shibanov, Yuriy

AU - Ryspaeva, Elizaveta

AU - Zyuzin, Dima

AU - Durant, Martin

AU - Kargaltsev, Oleg

AU - Pavlov, George

AU - Cabrera-Lavers, Antonio

PY - 2015/3/20

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N2 - PSR J2021+3651 is a 17 kyr old rotation powered pulsar detected in the radio, X-rays, and γ-rays. It powers a torus-like pulsar wind nebula with jets, dubbed the Dragonfly, which is very similar to that of the Vela pulsar. The Dragonfly is likely associated with the extended TeV source VER J2019+368 and extended radio emission. We conducted first deep optical observations with the Gran Telescopio Canarias in the Sloan r′ band to search for optical counterparts of the pulsar and its nebula. No counterparts were detected down to r′ 27.2 and 24. 8 for the point-like pulsar and the compact X-ray nebula, respectively. We also reanalyzed Chandra archival X-ray data taking into account an interstellar extinction-distance relation, constructed by us for the Dragonfly line of sight using the red-clump stars as standard candles. This allowed us to constrain the distance to the pulsar, kpc at 90% confidence. It is much smaller than the dispersion measure distance of ∼ 12 kpc but compatible with a γ-ray "pseudo-distance" of 1 kpc. Based on that and the optical upper limits, we conclude that PSR J2021+3651, similar to the Vela pulsar, is a very inefficient nonthermal emitter in the optical and X-rays, while its γ-ray efficiency is consistent with an average efficiency for γ-pulsars of similar age. Our optical flux upper limit for the pulsar is consistent with the long-wavelength extrapolation of its X-ray spectrum while the nebula flux upper limit does not constrain the respective extrapolation.

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Kirichenko A, Danilenko A, Shternin P, Shibanov Y, Ryspaeva E, Zyuzin D et al. Optical observations of PSR J2021+3651 in the dragonfly nebula with the GTC. Astrophysical Journal. 2015 Mar 20;802(1). 17. https://doi.org/10.1088/0004-637X/802/1/17