A new search for distant radio galaxies in the Southern hemisphere -- II. 2.2 micron imaging

Details A new search for distant radio galaxies in the Southern hemisphere -- II. 2.2 micron imaging A new search for distant radio galaxies in the Southern hemisphere -- II. 2.2 micron imaging

2009-02-03

arxiv.org/abs/0902.0643v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for MNRAS. 28 pages. Due to file size constraints, low resolution images have been used, and the high resolution vers

Scientific paper

10.1111/j.1365-2966.2009.14500.x

We have compiled a sample of 234 ultra-steep-spectrum (USS) selected radio sources in order to find high-redshift radio galaxies. The sample covers the declination range -40deg < DEC < -30deg in the overlap region between the 1400-MHz NRAO VLA Sky Survey, 408-MHz Revised Molonglo Reference Catalogue and the 843-MHz Sydney University Molonglo Sky Survey (the MRCR-SUMSS sample). This is the second in a series of papers on the MRCR-SUMSS sample, and here we present the K-band (2.2 micron) imaging of 173 of the sources primarily from the Magellan and the Anglo-Australian Telescopes. We detect a counterpart to the radio source in 93% of the new K-band images which, along with previously published data, makes this the largest published sample of K-band counterparts to USS-selected radio galaxies. The location of the K-band identification has been compared to the features of the radio emission for the double sources. We find that the identification is most likely to lie near the midpoint of the radio lobes rather than closer to the brighter lobe, making the centroid a less likely place to find the optical counterpart. 79% of the identifications are less than 1 arcsec from the radio lobe axis. These results differ from studies of low-redshift radio samples where the environments are typically not nearly so dense and disturbed as those at high redshift. In contrast to some literature samples, we find that the majority of our sample shows no alignment between the near-infrared and radio axes. Several different morphologies of aligned structures are found and those that are aligned within 10 degrees are consistent with jet-induced star formation. ...abridged...

Affiliated with

Also associated with

No associations

Rating

A new search for distant radio galaxies in the Southern hemisphere -- II. 2.2 micron imaging does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A new search for distant radio galaxies in the Southern hemisphere -- II. 2.2 micron imaging, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A new search for distant radio galaxies in the Southern hemisphere -- II. 2.2 micron imaging will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-553049