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25 April 2024 |
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NIR Spectroscopy and a Search for CO Emission in Three Extremely Luminous IRAS Sources; IR 09105+4108, IR 15307+3252, and PG 1634+706 | | A.S. Evans
; D.B. Sanders
; R.M. Cutri
; S.J.E. Radford
; J.A. Surace
; P.M. Solomon
; D. Downes
; C. Kramer
; | | Date: |
5 Jun 1998 | | Subject: | astro-ph | | Affiliation: | Caltech), D.B. Sanders (U. Hawaii), R.M. Cutri (IPAC | | Abstract: | Rest-frame 0.48-1.1 micron emission line strengths and molecular gas mass (H_2) upper limits for 3 luminous infrared sources - the hyperluminous infrared galaxies IR F09105+4108 (z=0.44), IR F15307+3252 (z=0.93), and the optically-selected QSO PG 1634+706 (z=1.3) - are presented. Diagnostic emission-line ratios indicate a Seyfert 2-like spectrum for both infrared galaxies, consistent with previously published work. The upper limits of molecular gas mass for all 3 sources are M(H_2) < 1-3x10^10 h^-2 M_sun (q=0.5, H=100h km/s/Mpc), less than that of the most gas-rich infrared galaxies in the local Universe. All 3 sources have L_ir/L’_CO = 1300-2000, and thus are the extragalactic sources with the most extreme L_ir/L’_CO values measured to date. Given the relatively warm far-infrared colors for all 3 objects, much of their infrared luminosity may emanate from a relatively modest amount of warm dust (e.g. M_d = 10^5-7 M_sun, T_d = 200-100 K) near the AGN... | | Source: | arXiv, astro-ph/9806091 | | Services: | Forum | Review | PDF | Favorites | |
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