Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprj11004p&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present initial results from a Chandra survey of 8 ultraluminous IR galaxies. These galaxies are at a redshift of z ~ 0.04 except for Arp 220 which is at z=0.02. The nuclei of these galaxies are dominated by a source unresolved by Chandra above 2 keV except in the case of Arp 220 which is extended by ~ 1'' (0.4 kpc). Significant Fe-K emission is only detected in Mkn 273. The upper-limits for narrow Fe-K emission at 6.4 keV are restrictive only in the cases of iras05189-2524 and Mkn 231 which have upper-limits of 0.31 and 0.46 keV, respectively. If the hard X-ray emission in iras05189-2524 and Mkn 231 are dominated by an AGN, then the limits on Fe-K emission rule out a reflection-dominated spectrum suggesting that the direct continuum is being observed through columns on the order of 10^22 cm-2 or that the observed continuum is scattered from highly-ionized material. The ratio of 2-10 keV flux to FIR is typically ~ 0.001-0.0001, which is consistent with a starburst origin to the hard X-rays. All galaxies in this sample except for iras05189-2524 exhibit complex extended emission below 2 keV on kpc scales suggestive of starburst-driven outflows.
Heckman Tim
Ptak Andrew
Strickland David
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