* Astronomy

Members Login
Username 
 
Password 
    Remember Me  
Post Info TOPIC: NGC 2071


L

Posts: 131433
Date:
NGC 2071
Permalink  
 


NGC 2071 (also LBN 938) is a magnitude +8.0 reflection nebula located 1,470 light-years away in the constellation Orion.
The nebula is close to M78 and NGC 2067.

The nebula was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at Clayhall Farm House in Old Windsor, on the 1st January 1786

Right Ascension 05 47 07.2 Declination +00° 17' 39"



__________________


L

Posts: 131433
Date:
Permalink  
 

Title: Chandra and Spitzer Imaging of the Infrared Cluster in NGC 2071
Authors: S.L. Skinner, K.R. Sokal, S.T. Megeath, M. Guedel, M. Audard, K.M. Flaherty, M.R. Meyer, A. Damineli

We present results of a sensitive Chandra X-ray observation and Spitzer mid-IR observations of the infrared cluster lying north of the NGC 2071 reflection nebula in the Orion B molecular cloud. We focus on the dense cluster core known as NGC 2071-IR which contains at least nine IR sources within a 40 x 40 arcsecond region. This region shows clear signs of active star formation including powerful molecular outflows, Herbig-Haro objects, and both OH and H2O masers. We use Spitzer IRAC images to aid in X-ray source identification and to determine YSO classes using mid-IR colours. Spitzer IRAC colours show that the luminous source IRS 1 is a class I protostar. IRS 1 is believed to be driving a powerful bipolar molecular outflow and may be an embedded B-type star or its progenitor. Its X-ray spectrum reveals a fluorescent Fe emission line at 6.4 keV, arising in cold material near the protostar. The line is present even in the absence of large flares, raising questions about the nature of the ionising mechanism responsible for producing the 6.4 keV fluorescent line. Chandra also detects X-ray sources at or near the positions of IRS 2, IRS 3, IRS 4, and IRS 6 and a variable X-ray source coincident with the radio source VLA 1, located just 2 arcsec north of IRS 1. No IR data are yet available to determine a YSO classification for VLA 1, but its high X-ray absorption shows that it is even more deeply-embedded than IRS 1, suggesting that it could be an even younger, less-evolved protostar.

Read more  (87kb, PDF)

__________________
Page 1 of 1  sorted by
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard