NDLI: A study of the properties of twin radio arms of FR-II extragalactic radio sources within $z\le1$ -II (dynamical properties)

Content Provider	Springer Nature Link
Author	Onuchukwu, C. C. Ubachukwu, A. A.
Copyright Year	2017
Abstract	We carried out a comparative study on the dynamical properties of the Longer Arm (LA) and the Shorter Arm (SA) of different classes of FR-II radio sources (Broad Line Radio Galaxies (BLRG), Quasars (Q), Narrow Line Radio Galaxies (NLRG) and Low Excitation Radio Galaxies (LERG)) based on self-similar model of time evolution of the radio lobes and hotspot properties of radio sources, using the power-law expression for the dependence of hotspot size $(D_{\mathrm{hs}})$ , the advance velocity of the hotspot $(v_{\mathrm{hs}})$ and hotspot luminosity $(P_{\mathrm{L}})$ on the core-lobe length $(D_{\mathrm{L}})$ . Using observational values of $D_{\mathrm{hs}}$ , $P_{\mathrm{L}}$ and $D_{\mathrm{L}}$ we constrained the exponents of these power-law relations for the LA and SA. We also estimated the hotspot pressure, ( $p_{\mathrm{hs}}$ ), cocoon pressure within the lobe ( $p_{\mathrm{cc}}$ ), the ratio of the hotspot pressure to the cocoon pressure ( $p_{\mathrm{hc}}$ ), the cocoon volume ( $V\mathrm{cc}$ ), the energy density within the cocoon ( $u_{\mathrm{cc}}$ ), the equipartition magnetic field ( $B_{\mathrm{em}}$ ) in the lobe, the particle number density at the hotspot ( $n_{\mathrm{hs}}$ ), the external density profile $(\rho _{\mathrm{ext}})$ and the kinetic jet power ( $Q_{\mathrm{jet}}$ ) for the LA and the SA. Linear regression analyses indicate a tight correlation between the $D_{\mathrm{hs}}$ and the $D_{\mathrm{L}}$ of LA for all classes of radio sources with $r\sim0.5\mbox{--}0.8$ . Similar result was obtained for SA except for that of Q with $r\sim 0.2$ . For $P_{\mathrm{hs}}$ and $D_{\mathrm{L}}$ correlation, the result indicates a mild negative correlation that seems stronger for the SA ( $r\sim-0.3$ to −0.6) than LA ( $r\sim-0.2$ to −0.4) for all the different classes of radio sources. Comparing the values of $\rho_{\mathrm{ext}}$ , $B_{\mathrm{em}}$ , $u_{\mathrm{B}}$ , $p_{\mathrm{hs}}$ , $p_{\mathrm{cc}}$ , $V\mathrm{cc}$ , and $u_{\mathrm{cc}}$ between SA side and LA side, indicate that the SA values of the parameters are higher than those of LA; while $(p_{\mathrm{hs}})$ showed higher values in LA than SA for all the different classes of radio sources. Generally, the hotspot has a larger volume on the LA side than on the SA side except for NLRG, while the hotspot of the SA side contains more particle per unit volume than the LA side for Q, BLRG and LERG. Furthermore, Our results indicate that jet kinetic power is higher on the LA side for Q and NLRG but is smaller on the SA side for LERG, with the jet thrust generally higher on the LA side than o the SA side for all classes of radio sources. Generally, our analysis indicates that environmental factor plays an important role in the dynamics and evolution of double radio sources.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	362
Issue Number	4
e-ISSN	1572946X
Language	English
Publisher	Springer Netherlands
Publisher Date	2017-03-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Methods: data analysis Galaxies: active General Astrophysics and Astroparticles Astronomy, Observations and Techniques Cosmology Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) Astrobiology
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

A study of the properties of twin radio arms of FR-II extragalactic radio sources within $z\le1$

Kinematic asymmetries in extragalactic radio sources—environmental effects III

Extragalactic HI surveys

Kinematic asymmetries in extragalactic radio sources II—Environmental effects

Gravitational anti-screening and binary galaxies

Colour asymmetry between galaxies with clockwise and counterclockwise handedness

Low-acceleration dwarf galaxies as tests of quantised inertia

Correlation analysis of radio properties and accretion-disk luminosity for low luminosity AGNs

The faint radio sky: radio astronomy becomes mainstream

A study of the properties of twin radio arms of FR-II extragalactic radio sources within $z\le1$ -II (dynamical properties)

Similar Documents

A study of the properties of twin radio arms of FR-II extragalactic radio sources within $z\le1$

Kinematic asymmetries in extragalactic radio sources—environmental effects III

Extragalactic HI surveys

Kinematic asymmetries in extragalactic radio sources II—Environmental effects

Gravitational anti-screening and binary galaxies

Colour asymmetry between galaxies with clockwise and counterclockwise handedness

Low-acceleration dwarf galaxies as tests of quantised inertia

Correlation analysis of radio properties and accretion-disk luminosity for low luminosity AGNs

The faint radio sky: radio astronomy becomes mainstream

A study of the properties of twin radio arms of FR-II extragalactic radio sources within $z\le1$ -II (dynamical properties)