SUMMARY OF PROPOSAL 53019

PROF. BRIAN MCBREEN
BMCBREEN@ACADAMH.UCD.IE

UNIVERSITY COLLEGE DUBLIN
IRELAND IRELAND 4
DUBLIN
STILLORGAN ROAD
Tel: 353-1-7062218 Fax: 353-1-2837275
Medium: 4GBDAT
Subject: AGN

ASCA OBSERVATIONS OF THE MICROLENSED BL LAC MS 0205.7+3509


ABSTRACT

The BL Lac source MS~0205.7+3509 is one of a small class of four BL Lac objects that are signficantly decentered with respect to their "host" galaxy, underluminous for a typical BL Lac host, show exces s absorption in soft X-rays and are probably microlensed but show no evidence for multiple images. We propose ASCA observations of the X-ray selected BL Lac MS 0205.7+3509 (Z$>$0.318) in order to (i) determine the main emission processes responsible for its x-ray spectrum, (ii) define its broadband (radio to X-ray) spectrum from which we can estimate its radio-X-ray bolometric luminosity and spectral break frequency and (iii) understand the role played by gravitational microlensing. Simultaneous IR, optical and radio monitoring will be used in the investigation.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
MAKOTO TASHIROUNIVERSITY OF TOKYOJAPAN
LORRAINE HANLONU.C. DUBLINIRELAND
NIALL SMITHR.T.C. CORKIRELAND
STEFAN WAGNERMAX-PLANCKGERMANY

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)MS 0205.7+3509
2
32.1587 35.3867 40 ksN
N
P
0.14100
1

TARGET 1

THE OPTIMUM PERIOD FOR OPTICAL OBSERVATIONS I S FEBRUARY