DUST TEMPERATURE DISTRIBUTIONS IN STAR-FORMING CONDENSATIONS

被引:29
作者
XIE, TL [1 ]
GOLDSMITH, PF [1 ]
SNELL, RL [1 ]
ZHOU, WM [1 ]
机构
[1] UNIV MASSACHUSETTS,FIVE COLL RADIO ASTRON OBSERV,DEPT PHYS & ASTRON,AMHERST,MA 01003
关键词
DUST; EXTINCTION; ISM; CLOUDS; STARS; FORMATION;
D O I
10.1086/172124
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a new approach for analysis of the dust emission spectra of the central infrared condensations in the dense cores of molecular clouds AFGL 2591, B335, L1551, Mon R2 and Sgr B2. We find that the far-infrared spectra of these objects can be reasonably well characterized by the functional form F(nu) Anu(beta)e-Bnu1/2, where A, beta, and B are positive parameters. Assuming a power-law wavelength dependence of the dust emissivity and that the dust emission is optically thin within the frequency range considered, we derive analytically the dust temperature distributions and total dust masses for these objects using an inversion method. The dust temperature distributions obtained in all cases indicate the existence of a low-temperature limit and a characteristic average temperature. The amount of dust at temperatures much higher than the characteristic average temperature decreases drastically, and most of the dust is within a few tens of degrees above the low ''cutoff'' temperature. The low-temperature cutoff and the characteristic average dust temperature are naturally sensitive to the power-law exponent for the emissivity law, indicating that our inadequate understanding about the emissivity at long wavelengths is the major source of uncertainty in the framework of this inversion technique. We compare our results with previous investigations using single-temperature dust models.
引用
收藏
页码:216 / 225
页数:10
相关论文
共 93 条
[1]   SPECTRAL EVOLUTION OF YOUNG STELLAR OBJECTS [J].
ADAMS, FC ;
LADA, CJ ;
SHU, FH .
ASTROPHYSICAL JOURNAL, 1987, 312 (02) :788-806
[2]  
BALLY J, 1983, APJ, V265, P864
[3]  
BEICHMAN CA, 1987, ANNU REV ASTRON ASTR, V25, P521
[4]   CANDIDATE SOLAR-TYPE PROTOSTARS IN NEARBY MOLECULAR CLOUD CORES [J].
BEICHMAN, CA ;
MYERS, PC ;
EMERSON, JP ;
HARRIS, S ;
MATHIEU, R ;
BENSON, PJ ;
JENNINGS, RE .
ASTROPHYSICAL JOURNAL, 1986, 307 (01) :337-349
[5]   VARIATIONS IN THE ABUNDANCE OF TRANSIENTLY HEATED PARTICLES WITHIN NEARBY MOLECULAR CLOUDS [J].
BOULANGER, F ;
FALGARONE, E ;
PUGET, JL ;
HELOU, G .
ASTROPHYSICAL JOURNAL, 1990, 364 (01) :136-+
[6]   EMISSION FROM DUST IN VISUAL REFLECTION NEBULAE AT INFRARED AND SUBMILLIMETER WAVELENGTHS [J].
CASEY, SC .
ASTROPHYSICAL JOURNAL, 1991, 371 (01) :183-+
[7]   MODIFIED MOBIUS INVERSE FORMULA AND ITS APPLICATIONS IN PHYSICS [J].
CHEN, NX .
PHYSICAL REVIEW LETTERS, 1990, 64 (11) :1193-1195
[8]  
CHINI R, 1984, ASTRON ASTROPHYS, V137, P117
[9]  
DEMUIZON M, 1985, ASTRON ASTROPHYS, V143, P160
[10]   INFRARED RADIATIVE-TRANSFER IN DENSE DISKS AROUND YOUNG STARS [J].
DENT, WRF .
ASTROPHYSICAL JOURNAL, 1988, 325 (01) :252-265