Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...18912208e&link_type=abstract
American Astronomical Society, 189th AAS Meeting, late abstracts, #122.08; Bulletin of the American Astronomical, Vol. 29, p. 73
Astronomy and Astrophysics
Astronomy
Scientific paper
Rest-frame 0.48--1.1 mu m emission line strengths and molecular gas mass (H_2) upper limits for three luminous infrared sources -- the hyperluminous infrared galaxies (HyLIGs: L_ir >= 10(13) L_sun where L_ir ~ L(8-1000microns )) IRAS F09104+4109 (z=0.4417), IRAS F15307+3252 (z=0.926), and the optically-selected QSO PG 1634+706 (z=1.338) -- are presented. Diagnostic emission-line ratios ([O III] lambda 5007/Hβ , [S II] lambda 6724/Hα , [N II] lambda 6583/Hα , and [S III] lambda lambda 9069+9532/Hα ) indicate a Seyfert 2-like spectrum for both infrared galaxies, consistent with previously published work. Upper limits on the molecular gas mass for all three sources are M(H_2) < 1-3 x 10(10) h(-2) \ M_sun (q_0=0.5, H_0 = 100h km s(-1) Mpc(-1) ), less than the H_2 mass of the most gas-rich infrared galaxies in the local Universe. All three sources have L_IR/L'_CO ~ 1300-2000, the most extreme values for extragalactic sources measured to date. Given the relatively warm far-infrared colors for all three objects, much of their infrared luminosity may emanate from a relatively small quantity of hot dust near the AGN. For IRAS F09104+4109 and IRAS F15307+3252, the implied circumnuclear covering factor of this dust is ~ 90%, while for PG 1634+706 the covering factor is only ~ 15%.
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