University of Hertfordshire

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From the same journal

By the same authors

Optical detection of the Pictor A jet and tidal tail: evidence against an IC/CMB jet

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Optical detection of the Pictor A jet and tidal tail : evidence against an IC/CMB jet. / Gentry, Eric S.; Marshall, Herman L.; Hardcastle, M.J.; Perlman, Eric S.; Birkinshaw, Mark; Worrall, Diana M.; Lenc, Emil; Siemiginowska, Aneta; Urry, C. Megan.

In: The Astrophysical Journal, Vol. 808, No. 1, 92, 20.07.2015.

Research output: Contribution to journalArticlepeer-review

Harvard

Gentry, ES, Marshall, HL, Hardcastle, MJ, Perlman, ES, Birkinshaw, M, Worrall, DM, Lenc, E, Siemiginowska, A & Urry, CM 2015, 'Optical detection of the Pictor A jet and tidal tail: evidence against an IC/CMB jet', The Astrophysical Journal, vol. 808, no. 1, 92. https://doi.org/10.1088/0004-637X/808/1/92

APA

Gentry, E. S., Marshall, H. L., Hardcastle, M. J., Perlman, E. S., Birkinshaw, M., Worrall, D. M., Lenc, E., Siemiginowska, A., & Urry, C. M. (2015). Optical detection of the Pictor A jet and tidal tail: evidence against an IC/CMB jet. The Astrophysical Journal, 808(1), [92]. https://doi.org/10.1088/0004-637X/808/1/92

Vancouver

Author

Gentry, Eric S. ; Marshall, Herman L. ; Hardcastle, M.J. ; Perlman, Eric S. ; Birkinshaw, Mark ; Worrall, Diana M. ; Lenc, Emil ; Siemiginowska, Aneta ; Urry, C. Megan. / Optical detection of the Pictor A jet and tidal tail : evidence against an IC/CMB jet. In: The Astrophysical Journal. 2015 ; Vol. 808, No. 1.

Bibtex

@article{4e3b37fd895a424db550199d3ee95e1c,
title = "Optical detection of the Pictor A jet and tidal tail: evidence against an IC/CMB jet",
abstract = "New images of the FR II radio galaxy Pictor A from the Hubble Space Telescope reveal a previously undiscovered tidal tail, as well as a number of jet knots coinciding with a known X-ray and radio jet. The tidal tail is approximately 5″ wide (3 kpc projected), starting 18″ (12 kpc) from the center of Pictor A, and extends more than 90″ (60 kpc). The knots are part of a jet observed to be about 4′ (160 kpc) long, extending to a bright hotspot. These images are the first optical detections of this jet, and by extracting knot flux densities through three filters, we set constraints on emission models. While the radio and optical flux densities are usually explained by synchrotron emission, there are several emission mechanisms that might be used to explain the X-ray flux densities. Our data rule out Doppler-boosted inverse Compton scattering as a source of the high-energy emission. Instead, we find that the observed emission can be well described by synchrotron emission from electrons with a low-energy index (p ∼ 2) that dominates the radio band, while a high-energy index (p ∼ 3) is needed for the X-ray band and the transition occurs in the optical/infrared band. This model is consistent with a continuous electron injection scenario.",
keywords = "galaxies: active, galaxies: individual (Pictor A), galaxies: jets, X-rays: galaxies",
author = "Gentry, {Eric S.} and Marshall, {Herman L.} and M.J. Hardcastle and Perlman, {Eric S.} and Mark Birkinshaw and Worrall, {Diana M.} and Emil Lenc and Aneta Siemiginowska and Urry, {C. Megan}",
note = "Date of Acceptance: 12/06/2015",
year = "2015",
month = jul,
day = "20",
doi = "10.1088/0004-637X/808/1/92",
language = "English",
volume = "808",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

RIS

TY - JOUR

T1 - Optical detection of the Pictor A jet and tidal tail

T2 - evidence against an IC/CMB jet

AU - Gentry, Eric S.

AU - Marshall, Herman L.

AU - Hardcastle, M.J.

AU - Perlman, Eric S.

AU - Birkinshaw, Mark

AU - Worrall, Diana M.

AU - Lenc, Emil

AU - Siemiginowska, Aneta

AU - Urry, C. Megan

N1 - Date of Acceptance: 12/06/2015

PY - 2015/7/20

Y1 - 2015/7/20

N2 - New images of the FR II radio galaxy Pictor A from the Hubble Space Telescope reveal a previously undiscovered tidal tail, as well as a number of jet knots coinciding with a known X-ray and radio jet. The tidal tail is approximately 5″ wide (3 kpc projected), starting 18″ (12 kpc) from the center of Pictor A, and extends more than 90″ (60 kpc). The knots are part of a jet observed to be about 4′ (160 kpc) long, extending to a bright hotspot. These images are the first optical detections of this jet, and by extracting knot flux densities through three filters, we set constraints on emission models. While the radio and optical flux densities are usually explained by synchrotron emission, there are several emission mechanisms that might be used to explain the X-ray flux densities. Our data rule out Doppler-boosted inverse Compton scattering as a source of the high-energy emission. Instead, we find that the observed emission can be well described by synchrotron emission from electrons with a low-energy index (p ∼ 2) that dominates the radio band, while a high-energy index (p ∼ 3) is needed for the X-ray band and the transition occurs in the optical/infrared band. This model is consistent with a continuous electron injection scenario.

AB - New images of the FR II radio galaxy Pictor A from the Hubble Space Telescope reveal a previously undiscovered tidal tail, as well as a number of jet knots coinciding with a known X-ray and radio jet. The tidal tail is approximately 5″ wide (3 kpc projected), starting 18″ (12 kpc) from the center of Pictor A, and extends more than 90″ (60 kpc). The knots are part of a jet observed to be about 4′ (160 kpc) long, extending to a bright hotspot. These images are the first optical detections of this jet, and by extracting knot flux densities through three filters, we set constraints on emission models. While the radio and optical flux densities are usually explained by synchrotron emission, there are several emission mechanisms that might be used to explain the X-ray flux densities. Our data rule out Doppler-boosted inverse Compton scattering as a source of the high-energy emission. Instead, we find that the observed emission can be well described by synchrotron emission from electrons with a low-energy index (p ∼ 2) that dominates the radio band, while a high-energy index (p ∼ 3) is needed for the X-ray band and the transition occurs in the optical/infrared band. This model is consistent with a continuous electron injection scenario.

KW - galaxies: active

KW - galaxies: individual (Pictor A)

KW - galaxies: jets

KW - X-rays: galaxies

U2 - 10.1088/0004-637X/808/1/92

DO - 10.1088/0004-637X/808/1/92

M3 - Article

AN - SCOPUS:84937859817

VL - 808

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 92

ER -