# University of Hertfordshire

## A high-resolution view of the jets in 3C 465

Research output: Contribution to journalArticlepeer-review

### Standard

A high-resolution view of the jets in 3C 465. / Bempong-Manful, E.; Hardcastle, M. J.; Birkinshaw, Mark; Laing, R. A.; Leahy, J. P.; Worrall, D. M.

In: Monthly Notices of the Royal Astronomical Society, 28.05.2020.

Research output: Contribution to journalArticlepeer-review

### APA

Bempong-Manful, E., Hardcastle, M. J., Birkinshaw, M., Laing, R. A., Leahy, J. P., & Worrall, D. M. (2020). A high-resolution view of the jets in 3C 465. Monthly Notices of the Royal Astronomical Society, [staa1471]. https://doi.org/10.1093/mnras/staa1471

### Author

Bempong-Manful, E. ; Hardcastle, M. J. ; Birkinshaw, Mark ; Laing, R. A. ; Leahy, J. P. ; Worrall, D. M. / A high-resolution view of the jets in 3C 465. In: Monthly Notices of the Royal Astronomical Society. 2020.

### Bibtex

@article{30e9bc2827f34db99a37e08206031bac,
title = "A high-resolution view of the jets in 3C 465",
abstract = " We present new high-resolution and high-sensitivity studies of the jets in the WAT source 3C 465, using deep transverse-resolved radio observations from e-MERLIN, and with complementary observations from the VLA. We derive a lower limit $\beta_{\rm j}$ = ($\nu_{\rm j}$/$c$) $\gtrsim$ 0.5 for the jet speed, and an upper limit $\theta_{\rm j}$ $\lesssim$ 61$^{\circ}$ for the jet angle to the line of sight. The jet spectral index ($\alpha$, defined in the sense $S \propto \nu^{\alpha}$) is fairly constant ( = $-$0.7), and spectral flattening within 4.4 kpc of the core coincides with bright knots and is consistent with the site of X-ray particle acceleration at the base of the radio jet found in previous studies. There is little difference between the spectra of the two hotspot components, plausibly indicating that electron populations of the same properties are injected there. The NW and SE plumes are approximately homologous structures, with variations in mass injection and propagation in external pressure and density gradients in the two regions plausibly accounting for the slightly steeper spectrum in the NW plume, = $-$1.43 compared with the SE plume, = $-$1.38. Our synchrotron lifetime model supports plausible reacceleration of particles within the plume materials. Overall, our results show that the first-order Fermi process at mildly relativistic and non-relativistic shocks is the most likely acceleration mechanism at play in 3C 465 and distinguish differences between the acceleration at $\beta_{\rm j}$ $>$ 0.5 and $\beta_{\rm j}$ $", keywords = "astro-ph.HE", author = "E. Bempong-Manful and Hardcastle, {M. J.} and Mark Birkinshaw and Laing, {R. A.} and Leahy, {J. P.} and Worrall, {D. M.}", note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society {\textcopyright}: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. https://doi.org/10.1093/mnras/staa147.", year = "2020", month = may, day = "28", doi = "10.1093/mnras/staa1471", language = "English", journal = "Monthly Notices of the Royal Astronomical Society", issn = "0035-8711", publisher = "Oxford University Press", } ### RIS TY - JOUR T1 - A high-resolution view of the jets in 3C 465 AU - Bempong-Manful, E. AU - Hardcastle, M. J. AU - Birkinshaw, Mark AU - Laing, R. A. AU - Leahy, J. P. AU - Worrall, D. M. N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. https://doi.org/10.1093/mnras/staa147. PY - 2020/5/28 Y1 - 2020/5/28 N2 - We present new high-resolution and high-sensitivity studies of the jets in the WAT source 3C 465, using deep transverse-resolved radio observations from e-MERLIN, and with complementary observations from the VLA. We derive a lower limit$\beta_{\rm j}$= ($\nu_{\rm j}$/$c$)$\gtrsim$0.5 for the jet speed, and an upper limit$\theta_{\rm j}\lesssim$61$^{\circ}$for the jet angle to the line of sight. The jet spectral index ($\alpha$, defined in the sense$S \propto \nu^{\alpha}$) is fairly constant ( =$-$0.7), and spectral flattening within 4.4 kpc of the core coincides with bright knots and is consistent with the site of X-ray particle acceleration at the base of the radio jet found in previous studies. There is little difference between the spectra of the two hotspot components, plausibly indicating that electron populations of the same properties are injected there. The NW and SE plumes are approximately homologous structures, with variations in mass injection and propagation in external pressure and density gradients in the two regions plausibly accounting for the slightly steeper spectrum in the NW plume, =$-$1.43 compared with the SE plume, =$-$1.38. Our synchrotron lifetime model supports plausible reacceleration of particles within the plume materials. Overall, our results show that the first-order Fermi process at mildly relativistic and non-relativistic shocks is the most likely acceleration mechanism at play in 3C 465 and distinguish differences between the acceleration at$\beta_{\rm j}>$0.5 and$\beta_{\rm j}

AB - We present new high-resolution and high-sensitivity studies of the jets in the WAT source 3C 465, using deep transverse-resolved radio observations from e-MERLIN, and with complementary observations from the VLA. We derive a lower limit $\beta_{\rm j}$ = ($\nu_{\rm j}$/$c$) $\gtrsim$ 0.5 for the jet speed, and an upper limit $\theta_{\rm j}$ $\lesssim$ 61$^{\circ}$ for the jet angle to the line of sight. The jet spectral index ($\alpha$, defined in the sense $S \propto \nu^{\alpha}$) is fairly constant ( = $-$0.7), and spectral flattening within 4.4 kpc of the core coincides with bright knots and is consistent with the site of X-ray particle acceleration at the base of the radio jet found in previous studies. There is little difference between the spectra of the two hotspot components, plausibly indicating that electron populations of the same properties are injected there. The NW and SE plumes are approximately homologous structures, with variations in mass injection and propagation in external pressure and density gradients in the two regions plausibly accounting for the slightly steeper spectrum in the NW plume, = $-$1.43 compared with the SE plume, = $-$1.38. Our synchrotron lifetime model supports plausible reacceleration of particles within the plume materials. Overall, our results show that the first-order Fermi process at mildly relativistic and non-relativistic shocks is the most likely acceleration mechanism at play in 3C 465 and distinguish differences between the acceleration at $\beta_{\rm j}$ $>$ 0.5 and $\beta_{\rm j}$ \$

KW - astro-ph.HE

U2 - 10.1093/mnras/staa1471

DO - 10.1093/mnras/staa1471

M3 - Article

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

M1 - staa1471

ER -