Proposal code

v125

Proposal title

Distribution of Spectral Index in the CSS 3C380

The

Investigators and their

Affiliations

P.I. KAMENO Seiji NAO, Japan
INOUE Makoto NAO, Japan
TABARA Hiroto Utsunomiya University, Japan
FUJISAWA Kenta ISAS, Japan
WAJIMA Kiyoaki ISAS, Japan

Proposal Abstract

Compact Steep-Spectrum sources (CSSs) have both intrinsically compact size (<10 kpc) and steep spectrum (alpha <= -0.5). We found that CSSs also have active flat-spectrum core (Kameno et al. 1995). The steep-spectrum compact lobes dominate in integrated spectrum. Thus the spectrum index of jet emanating from flat-spectrum core rapidly get steeper toward lobes. To investigate how spectral steepening occures, we propose observations for the CSS 3C380 at 3 frequences and obtain distribution of spectral index in its jet. It consists of currently active flat-spectrum core and one-sided steep spectrum jet. A bright flat-spectrum knot 7 mas distant from the core is thought to be due to interaction between relativistic jets and local dense medium. Such a circumstance is preferable for our aim. Furthermore, a new knot component might be created at the flare of the core in 1993. We will also try to identify the new knot component.

The full Cover Sheets (compressed post-script, typically 50kbytes) can be retrieved. Note that many proposals were reduced in extent by the Scientific Review Committee (e.g. by reducing the number of experiments), however the Cover Sheets contain the full proposal as submitted. Also note that AO1 proposals were submitted in November 1995, and information such as affiliations and contact details has changed for some proposers since that time. The Cover Sheets (and the details on this page, which were derived from the Cover Sheets) may therefore have changed.