Imperial College London


Faculty of Natural SciencesDepartment of Physics

Professor of Experimental Astrophysics



+44 (0)20 7594 7552t.sumner




1108Blackett LaboratorySouth Kensington Campus






BibTex format

author = {Gunn, KF and McHardy, IM and Almaini, O and Shanks, T and Sumner, TJ and Muxlow, TWB and Efstathiou, A and Jones, LR and Croom, SM and Manners, JC and Newsam, AM and Mason, KO and Serjeant, SBG and Rowan-Robinson, M},
doi = {10.1046/j.1365-8711.2001.04144.x},
journal = {Monthly Notices of the Royal Astronomical Society},
pages = {305--312},
title = {Starburst activity in a ROSAT narrow emission-line galaxy},
url = {},
volume = {324},
year = {2001}

RIS format (EndNote, RefMan)

AB - We present multiwaveband photometric and optical spectropolarimetric observations of the R=15. 9 narrow emission-line galaxy R117_A which lies on the edge of the error circle of the ROSAT X-ray source R117. The overall spectral energy distribution of the galaxy is well modelled by a combination of a normal spiral galaxy and a moderate-strength burst of star formation. The far-infrared and radio emission is extended along the major axis of the galaxy, indicating an extended starburst.On positional grounds, the galaxy is a good candidate for the identification of R117, and the observed X-ray flux is very close to what would be expected from a starburst of the observed far-infrared and radio fluxes. Although an obscured high-redshift QSO cannot be entirely ruled out as contributing some fraction of the X-ray flux, we find no candidates to K=20. 8 within the X-ray error box, and so conclude that R117_A is responsible for a large fraction, if not all, of the X-ray emission from R117.Searches for indicators of an obscured AGN in R117_A have so far proven negative; deep spectropolarimetric observations show no signs of broad lines to a limit of 1 per cent and, for the observed far-infrared and radio emission, we would expect 10 times greater X-ray flux if the overall emission were powered by an AGN. We therefore conclude that the X-ray emission from R117 is dominated by starburst emission from the galaxy R117_A.
AU - Gunn,KF
AU - McHardy,IM
AU - Almaini,O
AU - Shanks,T
AU - Sumner,TJ
AU - Muxlow,TWB
AU - Efstathiou,A
AU - Jones,LR
AU - Croom,SM
AU - Manners,JC
AU - Newsam,AM
AU - Mason,KO
AU - Serjeant,SBG
AU - Rowan-Robinson,M
DO - 10.1046/j.1365-8711.2001.04144.x
EP - 312
PY - 2001///
SN - 0035-8711
SP - 305
TI - Starburst activity in a ROSAT narrow emission-line galaxy
T2 - Monthly Notices of the Royal Astronomical Society
UR -
UR -
UR -
VL - 324
ER -