E-resources
-
Collier, J D; Tingay, S J; Callingham, J R; Norris, R P; Filipović, M D; Galvin, T J; Huynh, M T; Intema, H T; Marvil, J; O'Brien, A N; Roper, Q; Sirothia, S; Tothill, N F H; Bell, M E; For, B-Q; Gaensler, B M; Hancock, P J; Hindson, L; Hurley-Walker, N; Johnston-Hollitt, M; Kapińska, A D; Lenc, E; Morgan, J; Procopio, P; Staveley-Smith, L; Wayth, R B; Wu, C; Zheng, Q; Heywood, I; Popping, A
Monthly notices of the Royal Astronomical Society, 03/2018, Volume: 477, Issue: 1Journal Article
Abstract We present very long baseline interferometry observations of a faint and low-luminosity (L1.4 GHz < 1027 W Hz−1) gigahertz-peaked spectrum (GPS) and compact steep-spectrum (CSS) sample. We select eight sources from deep radio observations that have radio spectra characteristic of a GPS or CSS source and an angular size of θ ≲ 2 arcsec, and detect six of them with the Australian Long Baseline Array. We determine their linear sizes, and model their radio spectra using synchrotron self-absorption (SSA) and free–free absorption (FFA) models. We derive statistical model ages, based on a fitted scaling relation, and spectral ages, based on the radio spectrum, which are generally consistent with the hypothesis that GPS and CSS sources are young and evolving. We resolve the morphology of one CSS source with a radio luminosity of $10^{25}\, \hbox{W Hz}^{-1}$, and find what appear to be two hotspots spanning 1.7 kpc. We find that our sources follow the turnover–linear size relation, and that both homogeneous SSA and an inhomogeneous FFA model can account for the spectra with observable turnovers. All but one of the FFA models do not require a spectral break to account for the radio spectrum, while all but one of the alternative SSA and power-law models do require a spectral break to account for the radio spectrum. We conclude that our low-luminosity sample is similar to brighter samples in terms of their spectral shape, turnover frequencies, linear sizes, and ages, but cannot test for a difference in morphology.
Author
Shelf entry
Permalink
- URL:
Impact factor
Access to the JCR database is permitted only to users from Slovenia. Your current IP address is not on the list of IP addresses with access permission, and authentication with the relevant AAI accout is required.
Year | Impact factor | Edition | Category | Classification | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Select the library membership card:
If the library membership card is not in the list,
add a new one.
DRS, in which the journal is indexed
Database name | Field | Year |
---|
Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
---|
Source: Personal bibliographies
and: SICRIS
The material is available in full text. If you wish to order the material anyway, click the Continue button.