A HIGH-REDSHIFT IRAS GALAXY WITH HUGE LUMINOSITY - HIDDEN QUASAR OR PROTOGALAXY

被引:248
作者
ROWANROBINSON, M
BROADHURST, T
LAWRENCE, A
MCMAHON, RG
LONSDALE, CJ
OLIVER, SJ
TAYLOR, AN
HACKING, PB
CONROW, T
SAUNDERS, W
ELLIS, RS
EFSTATHIOU, GP
CONDON, JJ
机构
[1] QUEEN MARY & WESTFIELD COLL, DEPT PHYS, LONDON E1 4NS, ENGLAND
[2] UNIV CAMBRIDGE, INST ASTRON, CAMBRIDGE CB3 0HA, ENGLAND
[3] CALTECH, CTR INFRARED PROC & ANAL, PASADENA, CA 91125 USA
[4] CALTECH, JET PROP LAB, PASADENA, CA 91109 USA
[5] UNIV OXFORD, DEPT ASTROPHYS, OXFORD OX1 3RH, ENGLAND
[6] UNIV DURHAM, DEPT PHYS, DURHAM DH1 3LE, ENGLAND
[7] NATL RADIO ASTRON OBSERV, CHARLOTTESVILLE, VA 22903 USA
关键词
D O I
10.1038/351719a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
DURING a survey intended to measure redshifts for 1,400 galaxies identified with faint sources detected by the Infrared Astronomy Satellite, we found an emission-line galaxy at a redshift of 2.286, and with the enormous far-infrared luminosity of 3 x 10(14) times that of the Sun (L.). The spectrum is very unusual, showing lines of high excitation but with very weak Lyman-alpha emission. A self-absorbed synchrotron model for the infrared energy distribution cannot be ruled out, but a thermal origin seems more plausible. A radio-quiet quasar embedded in a very dusty galaxy could account for the infrared emission, as might a starburst embedded in 1-10 x 10(9) M. of dust. The latter case demands so much dust that the object would probably be a massive galaxy in the. process of formation. In either case, this is a remarkable object, and the presence of a large amount of dust in an object of such high redshift implies the generation of heavy elements at an early cosmological epoch.
引用
收藏
页码:719 / 721
页数:3
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