Molecular hydrogen as baryonic dark matter

被引：24

作者：

Heithausen, A ^{[1
]}

机构：

[1] Univ Bonn, Inst Radioastron, D-53121 Bonn, Germany

来源：

ASTROPHYSICAL JOURNAL | 2004年 / 606卷 / 01期

关键词：

dark matter; ISM : clouds; ISM : molecules;

D O I：

10.1086/421111

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

High angular resolution CO observations of small-area molecular structures are presented. The featureless structures seen in the single-dish measurements break up into several smaller clumps in the interferometer map. At an adopted distance of 100 pc their sizes are on the order of a few hundred AU, some of which are still unresolved at an angular resolution of about 3". The clumps have a fractal structure with a fractal index between 1.7 and 2.0. Their kinetic temperature is between 7 and 18 K. Adopting standard conversion factors masses are about (1/10)M-J for individual clumps, and densities are higher than 20,000 cm(-3). The clumps are highly overpressured, and it is unknown what creates or maintains such structures.

引用

页码：L13 / L15

页数：3

共 19 条

[1] Limits on Galactic dark matter with 5 years of EROS SMC data [J].

Afonso, C ;

Albert, JN ;

Andersen, J ;

Ansari, R ;

Aubourg, É ;

Bareyre, P ;

Beaulieu, JP ;

Blanc, G ;

Charlot, X ;

Couchot, E ;

Coutures, C ;

Ferlet, R ;

Fouqué, P ;

Glicenstein, JE ;

Goldman, B ;

Gould, A ;

Graff, D ;

Gros, M ;

Haissinski, J ;

Hamadache, C ;

de Kat, J ;

Lasserre, T ;

Le Guillou, L ;

Lesquoy, É ;

Loup, C ;

Magneville, C ;

Marquette, JB ;

Maurice, É ;

Maury, A ;

Milsztajn, A ;

Moniez, M ;

Palanque-Delabrouille, N ;

Perdereau, O ;

Prevot, L ;

Rahal, YR ;

Rich, J ;

Spiro, M ;

Tisserand, P ;

Vidal-Madjar, A ;

Vigroux, L ;

Zylberajch, S .

ASTRONOMY & ASTROPHYSICS, 2003, 400 (03) :951-956

[2] Gamma-ray astronomy and baryonic dark matter [J].

De Paolis, F ;

Ingrosso, G ;

Jetzer, P ;

Roncadelli, M .

ASTROPHYSICAL JOURNAL, 1999, 510 (02) :L103-L106

[3] MOLECULAR AND ATOMIC CLOUDS ASSOCIATED WITH INFRARED CIRRUS IN URSA MAJOR [J].

DEVRIES, HW ;

HEITHAUSEN, A ;

THADDEUS, P .

ASTROPHYSICAL JOURNAL, 1987, 319 (02) :723-729

[4] THE EDGES OF MOLECULAR CLOUDS - FRACTAL BOUNDARIES AND DENSITY STRUCTURE [J].

FALGARONE, E ;

PHILLIPS, TG ;

WALKER, CK .

ASTROPHYSICAL JOURNAL, 1991, 378 (01) :186-201

[5]

Falgarone E, 1998, ASTRON ASTROPHYS, V331, P669

[6] Baryonic dark halos: A cold gas component? [J].

Gerhard, O ;

Silk, J .

ASTROPHYSICAL JOURNAL, 1996, 472 (01) :34-45

[7] DENSE CORES IN DARK CLOUDS .8. VELOCITY-GRADIENTS [J].

GOODMAN, AA ;

BENSON, PJ ;

FULLER, GA ;

MYERS, PC .

ASTROPHYSICAL JOURNAL, 1993, 406 (02) :528-547

[8]

GROSSMANN V, 1992, ASTRON ASTROPHYS, V264, P195

[9] Small-area molecular structures without shielding [J].

Heithausen, A .

ASTRONOMY & ASTROPHYSICS, 2002, 393 (02) :L41-L44

[10] EGRET observations of the diffuse gamma-ray emission from the Galactic plane [J].

Hunter, SD ;

Bertsch, DL ;

Catelli, JR ;

Dame, TM ;

Digel, SW ;

Dingus, BL ;

Esposito, JA ;

Fichtel, CE ;

Hartman, RC ;

Kanbach, G ;

Kniffen, DA ;

Lin, YC ;

MayerHasselwander, HA ;

Michelson, PF ;

vonMontigny, C ;

Mukherjee, R ;

Nolan, PL ;

Schneid, E ;

Sreekumar, P ;

Thaddeus, P ;

Thompson, DJ .

ASTROPHYSICAL JOURNAL, 1997, 481 (01) :205-240

← 1 2 →