|
| | | | |
| | | |
| Stat |
Members: 3644
Articles: 2'499'343
Articles rated: 2609
16 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
High-resolution VLA Imaging of Obscured Quasars: Young Radio Jets Caught in a Dense ISM | | Pallavi Patil
; Kristina Nyland
; Mark Whittle
; Carol Lonsdale
; Mark Lacy
; Colin Lonsdale
; Dipanjan Mukherjee
; A. C. Trapp
; Amy E. Kimball
; Lauranne Lanz
; Belinda J. Wilkes
; Andrew Blain
; Jeremy J. Harwood
; Andreas Efstathiou
; Catherine Vlahakis
; | | Date: |
16 Apr 2020 | | Abstract: | We present new sub-arcsecond-resolution Karl G. Jansky Very Large Array (VLA)
imaging at 10 GHz of 155 ultra-luminous ($L_{
m bol}sim10^{11.7-14.2}
L_odot$) and heavily obscured quasars with redshifts $z sim0.4-3$. The sample
was selected to have extremely red mid-infrared (MIR)-optical color ratios
based on data from Wide-Field Infrared Survey Explorer (WISE) along with a
detection of bright, unresolved radio emission from the NRAO VLA Sky Survey
(NVSS) or Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) Survey.
Our high-resolution VLA observations have revealed that the majority of the
sources in our sample (93 out of 155) are compact on angular scales
$<0.2^{prime prime}$ ($leq 1.7$ kpc at $z sim2$). The radio luminosities,
linear extents, and lobe pressures of our sources are similar to young radio
active galactic nuclei (AGN; e.g., Gigahertz Peaked Spectrum, GPS, and Compact
Steep Spectrum, CSS, sources), but their space density is considerably lower.
Application of a simple adiabatic lobe expansion model suggests relatively
young dynamical ages ($sim10^{4-7}$ years), relatively high ambient ISM
densities ($sim1-10^4$ cm$^{-3}$), and modest lobe expansion speeds
($sim30-10,000$ km s$^{-1}$). Thus, we find our sources to be consistent with
a population of newly triggered, young jets caught in a unique evolutionary
stage in which they still reside within the dense gas reservoirs of their
hosts. Based on their radio luminosity function and dynamical ages, we estimate
only $sim20\%$ of classical large scale FRI/II radio galaxies could have
evolved directly from these objects. We speculate that the WISE-NVSS sources
might first become GPS or CSS sources, of which some might ultimately evolve
into larger radio galaxies. | | Source: | arXiv, 2004.7914 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER