Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20511012g&link_type=abstract
American Astronomical Society Meeting 205, #110.12; Bulletin of the American Astronomical Society, Vol. 36, p.1536
Astronomy and Astrophysics
Astronomy
Scientific paper
We present multi-epoch VLBA observations of Compact Symmetric Objects (CSOs) from the COINS sample (CSOs Observed In the Northern Sky). CSOs are a class of AGN with emission on both sides of the central engine and with small sizes (< 1 kpc) that are thought to be due to their youth. Their ages are derived from the motions of the hotspots as they move away from each other with time. Our new observations allow us to make estimates of, or place limits on, the kinematic ages for 12 sources with well-identified hot spots. This study significantly increases the number of CSOs with well-determined ages or limits. The age distribution is found to be sharply peaked under 500 years and within a range from 240 to 3000 years, suggesting that many CSOs die young, or are episodic in nature, and very few survive to evolve into FR II sources like Cygnus A. Jet components are found to have higher velocities than hot spots, which is consistent with their movement down cleared channels. We also present the first detections of significant polarization in two CSOs, J0000+4054 (2.1%) and J1826+1831 (8.8%). In both cases the polarized emission is found in jet components on the stronger side of the center of activity.
This research was part of the National Science Foundation's (NSF) Research Experience for Undergraduates (REU) at the National Radio Astronomy Observatory (NRAO) in Socorro, New Mexico.
Giroletti Marcello
Gugliucci Nicole E.
Peck Alison Beth
Taylor Greg B.
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