Mid-infrared imaging of star-forming regions containing methanol masers

被引:49
作者
De Buizer, JM [1 ]
Piña, RK [1 ]
Telesco, CM [1 ]
机构
[1] Univ Florida, Dept Astron, Gainesville, FL 32601 USA
关键词
circumstellar matter; infrared : stars; masers; stars : formation; stars : pre-main-sequence;
D O I
10.1086/317351
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a mid-infrared imaging survey of 21 sites of massive star formation associated with methanol masers. Images were obtained from the Cerro Tololo Inter-American Observatory 4 m Blanco telescope using the University of Florida imager/spectrometer OSCIR. Of the 10 sites where the methanol masers are distributed in a linear fashion, we find three sources that are elongated at the same position angle as their linear methanol maser distributions. It is believed that these elongated mid-infrared objects are indeed circumstellar disks. It was found that the masers may arise inside the mid-infrared emitting regions of these young stellar objects, indicating that the methanol masers may be pumped by midinfrared photons. Many mid-infrared sources in our survey have no detectable radio continuum emission, and we advance the hypothesis that these sources are lower mass, nonionizing stars.
引用
收藏
页码:437 / 461
页数:25
相关论文
共 68 条
[1]   SUBMILLIMETER CONTINUUM OBSERVATIONS OF RHO OPHIUCHI-A - THE CANDIDATE PROTOSTAR VLA-1623 AND PRESTELLAR CLUMPS [J].
ANDRE, P ;
WARDTHOMPSON, D ;
BARSONY, M .
ASTROPHYSICAL JOURNAL, 1993, 406 (01) :122-141
[2]  
Bachiller R, 1998, ASTRON ASTROPHYS, V335, P266
[3]   DETECTION OF STRONG METHANOL MASERS TOWARDS GALACTIC H-II REGIONS [J].
BATRLA, W ;
MATTHEWS, HE ;
MENTEN, KM ;
WALMSLEY, CM .
NATURE, 1987, 326 (6108) :49-51
[4]   A NEW BINARY FORMATION MECHANISM [J].
BONNELL, IA .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1994, 269 (03) :837-848
[5]  
CARRAL P, 1997, APJ, V486, P103
[6]  
CASWELL JL, 1987, ASTRON ASTROPHYS, V171, P261
[7]   EXCITED-STATE OH MASERS AT 6.035 GHZ [J].
CASWELL, JL ;
VAILE, RA .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1995, 273 (02) :328-346
[8]  
CASWELL JL, 1995, MON NOT R ASTRON SOC, V277, P210
[9]   Coincidence of maser emission from OH at 6.035 GHz and methanol at 6.668 GHz [J].
Caswell, JL .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1997, 289 (01) :203-224
[10]   SURVEY OF OH MASERS AT 1665 AND 1667 MHZ .1. GALACTIC LONGITUDES 326-DEGREES TO 340-DEGREES [J].
CASWELL, JL ;
HAYNES, RF ;
GOSS, WM .
AUSTRALIAN JOURNAL OF PHYSICS, 1980, 33 (03) :639-669