Discovery and Environment of Five Ultraluminous IRAS Galaxies

Details Discovery and Environment of Five Ultraluminous IRAS Galaxies Discovery and Environment of Five Ultraluminous IRAS Galaxies

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.275..819c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 275, NO. 3/AUG1, P. 819, 1995

Astronomy and Astrophysics

Astronomy

5

Scientific paper

Five ultraluminous IRAS galaxies have been discovered during the optical identification of IRAS point sources in 313.9 deg^2^ of the north galactic cap. Results are presented of optical spectroscopic and imaging observations of these galaxies. Three are classified as starburst or possibly starburst, and two are classified as Seyfert 2. The far-infrared luminosities are in the range 1.3-3.1 x 10^12^ L_sun_ (for H_0_ = 50 km s^-1^ Mpc^-1^), with the two most luminous being the two Seyfert 2 galaxies. Three of the five are clearly seen to be interacting or to have very disturbed morphologies, presumably indicating interactions. None of the projected separations between galaxies is as low as the critical value of ~10 kpc suggested by Melnick & Mirabel for galaxies to become ultraluminous. These separations are also not consistent with the final mergers required by Mihos & Hernquist for ultraluminous starbursts. Closer but unobvious interactions are possible, however. One interacting system has two components separated by ~8 kpc but it is not ultraluminous. In this case it may be that the galaxies lacked the dense, central bulges that would delay starbursts until the final merger.

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