DIFFERENTIAL EVOLUTION OF LYMAN ALPHA-LINES

被引：5

作者：

ACHARYA, M ^{[1
]}

KHARE, P ^{[1
]}

机构：

[1] UTKAL UNIV,DEPT PHYS,BHUBANESWAR 751004,ORISSA,INDIA

来源：

JOURNAL OF ASTROPHYSICS AND ASTRONOMY | 1993年 / 14卷 / 02期

关键词：

GALAXIES; QUASARS; ABSORPTION LINES;

D O I：

10.1007/BF02702251

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have analysed a large, homogeneous sample of Lyman alpha lines, observed at intermediate resolution, using the maximum likelihood method. The analysis shows that the evolutionary index gamma, is a function of rest equivalent width with stronger lines evolving faster. The mean equivalent width increases with redshift. This behaviour is similar to that exhibited by the heavy element absorption lines in the quasar spectra.

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页码：97 / 102

页数：6

相关论文

共 12 条

[1] REDSHIFT EVOLUTION OF THE LYMAN-LINE ABSORBING CLOUDS IN QUASAR SPECTRA [J].

ATWOOD, B ;

BALDWIN, JA ;

CARSWELL, RF .

ASTROPHYSICAL JOURNAL, 1985, 292 (01) :58-71

[2] THE EVOLUTION OF LOW-IONIZATION QSO ABSORPTION SYSTEMS [J].

CAULET, A .

ASTROPHYSICAL JOURNAL, 1989, 340 (01) :90-116

[3] LYMAN ALPHA EVOLUTION AT HIGH-RESOLUTION - EVIDENCE FOR A SINGLE POPULATION [J].

GIALLONGO, E .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1991, 251 (03) :541-544

[4]

HUNSTEAD RW, 1988, QSO ABSORPTION LINES, P71

[5] EVOLUTION OF LY-ALPHA CLOUDS - OBSERVATIONAL BIASES DUE TO LINE CROWDING [J].

LIU, XD ;

JONES, BJT .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1988, 230 (04) :481-490

[6] THE REDSHIFT DISTRIBUTION OF LY-ALPHA CLOUDS AND THE PROXIMITY EFFECT [J].

LU, L ;

WOLFE, AM ;

TURNSHEK, DA .

ASTROPHYSICAL JOURNAL, 1991, 367 (01) :19-36

[7] ABSORPTION-SPECTRUM OF THE Z = 3.78 QSO 2000-330 .2. THE REDSHIFT AND EQUIVALENT WIDTH DISTRIBUTIONS OF PRIMORDIAL HYDROGEN CLOUDS [J].

MURDOCH, HS ;

HUNSTEAD, RW ;

PETTINI, M ;

BLADES, JC .

ASTROPHYSICAL JOURNAL, 1986, 309 (01) :19-32

[8] EFFECTS OF BLENDING ON ESTIMATES OF THE REDSHIFT EVOLUTION OF QSO LY-ALPHA ABSORBERS [J].

PARNELL, HC ;

CARSWELL, RF .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1988, 230 (04) :491-495

[9]

PETITJEAN P, 1990, ASTRON ASTROPHYS, V231, P309

[10] C-IV ABSORPTION IN A NEW SAMPLE OF 55 QSOS - EVOLUTION AND CLUSTERING OF THE HEAVY-ELEMENT ABSORPTION REDSHIFTS [J].

SARGENT, WLW ;

BOKSENBERG, A ;

STEIDEL, CC .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1988, 68 (04) :539-641