A search for molecules in damped Lyman-alpha absorbers occulting millimetre-loud quasars

被引：8

作者：

Curran, SJ ^{[1
]}

Murphy, MT

Webb, JK

Rantakyrö, F

Johansson, LEB

Nikolic, S

机构：

[1] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

[2] European So Observ, Santiago 19, Chile

[3] Univ Chile, Observ Cerro Calan, Santiago, Chile

[4] Chalmers Univ Technol, Onsala Space Observ, S-43992 Onsala, Sweden

[5] Astron Observ, YU-11160 Belgrade, Serbia, Yugoslavia

来源：

ASTRONOMY & ASTROPHYSICS | 2002年 / 394卷 / 03期

关键词：

quasars : absorption lines; cosmology : observations; cosmology : early Universe;

D O I：

10.1051/0004-6361:20021231

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have used the SEST 15-metre and Onsala 20-metre telescopes to perform deep (rms greater than or similar to 30 mJy) integrations of various molecular rotational transitions towards damped Lyman-alpha absorption systems (DLAs) known to occult millimetre-loud quasars. We have observed 6 new systems and improved the existing limits for 11 transitions. These limits may be approaching the sensitivities required to detect new systems and we present a small number of candidate systems which we believe warrant further observation.

引用

页码：763 / 768

页数：6

共 40 条

[1] THE SPATIAL EXTENT OF THE Z=2.04 ABSORBER IN THE SPECTRUM OF PKS-0458-020 [J].

BRIGGS, FH ;

WOLFE, AM ;

LISZT, HS ;

DAVIS, MM ;

TURNER, KL .

ASTROPHYSICAL JOURNAL, 1989, 341 (02) :650-657

[2] THE INCIDENCE OF 21 CENTIMETER ABSORPTION IN QSO REDSHIFT SYSTEMS SELECTED FOR MG-II ABSORPTION - EVIDENCE FOR A 2-PHASE NATURE OF THE ABSORBING GAS [J].

BRIGGS, FH ;

WOLFE, AM .

ASTROPHYSICAL JOURNAL, 1983, 268 (01) :76-89

[3] Redshifted neutral hydrogen 21 centimeter absorption toward red quasars [J].

Carilli, CL ;

Menten, KM ;

Reid, MJ ;

Rupen, MP ;

Yun, MS .

ASTROPHYSICAL JOURNAL, 1998, 494 (01) :175-182

[4] Astronomical constraints on the cosmic evolution of the fine structure constant and possible quantum dimensions [J].

Carilli, CL ;

Menten, KM ;

Stocke, JT ;

Perlman, E ;

Vermeulen, R ;

Briggs, F ;

de Bruyn, AG ;

Conway, J ;

Moore, CP .

PHYSICAL REVIEW LETTERS, 2000, 85 (26) :5511-5514

[5] Redshifted H I 21 cm line observations of damped LY alpha absorption systems [J].

Carilli, CL ;

Lane, W ;

deBruyn, AG ;

Braun, R ;

Miley, GK .

ASTRONOMICAL JOURNAL, 1996, 111 (05) :1830-1838

[6]

COMBES F, 1998, ESO MESSENGER, V91, P29

[7] ASTROPHYSICAL LIMITS ON THE EVOLUTION OF DIMENSIONLESS PHYSICAL CONSTANTS OVER COSMOLOGICAL TIME [J].

COWIE, LL ;

SONGAILA, A .

ASTROPHYSICAL JOURNAL, 1995, 453 (02) :596-598

[8] A catalogue of damped Lyman alpha absorption systems and radio flux densities of the background quasars [J].

Curran, SJ ;

Webb, JK ;

Murphy, MT ;

Bandiera, R ;

Corbelli, E ;

Flambaum, VV .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA, 2002, 19 (04) :455-474

[9]

DOUGLAS NG, 1992, ASTRON ASTROPHYS, V262, P8

[10] New limits on the possible variation of physical constants [J].

Drinkwater, MJ ;

Webb, JK ;

Barrow, JD ;

Flambaum, VV .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 295 (02) :457-462

← 1 2 3 4 →