Chandra observations of the Eagle Nebula.: I.: Embedded young stellar objects near the Pillars of Creation

被引:36
作者
Linsky, Jeffrey L. [1 ]
Gagne, Marc
Mytyk, Anna
McCaughrean, Mark
Andersen, Morten
机构
[1] Univ Colorado, JILA, Boulder, CO 80309 USA
[2] Natl Inst Stand & Technol, Boulder, CO 80309 USA
[3] W Chester Univ, Dept Geol & Astron, W Chester, PA 19383 USA
[4] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England
[5] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
关键词
ISM : individual (HH 216); open clusters and associations : individual ( Eagle Nebula; M16; NGC; 6611); stars : activity; stars : coronae; stars : early-type; stars : pre-main-sequence; X-rays : stars;
D O I
10.1086/508763
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present and analyze the first high-resolution X-ray images ever obtained of the Eagle Nebula star-forming region. On 2001 July 30 the Chandra X-Ray Observatory obtained a 78 ks image of the Eagle Nebula (M16) that includes the core of the young galactic cluster NGC 6611 and the dark columns of dust and cold molecular gas in M16 known as the "Pillars of Creation.'' We find a total of 1101 X-ray sources in the 17' x 17' ACIS-I field of view. Most of the X-ray sources are low-mass pre-main-sequence or high-mass main-sequence stars in this young cluster. A handful of hard X-ray sources in the pillars are spatially coincident with deeply embedded young stellar objects seen in high-resolution near-infrared images recently obtained with the VLT (McCaughrean & Andersen). In this paper, we focus on the 40 X-ray sources in and around pillars 1-4 at the heart of the Eagle Nebula. None of the X-ray sources are associated with the evaporating gaseous globules ( EGGs) first observed by Hester and coworkers) in HST WFPC2 images of M16, implying either that the EGGs do not contain protostars or that the protostars have not yet become X-ray active. Eight X-ray counts are coincident with the Herbig-Haro object HH 216, implying log L-X approximate to 30.0.
引用
收藏
页码:347 / 360
页数:14
相关论文
共 60 条
[41]   Discovery of X-rays from the protostellar outflow object HH2 [J].
Pravdo, SH ;
Feigelson, ED ;
Garmire, G ;
Maeda, Y ;
Tsuboi, Y ;
Bally, J .
NATURE, 2001, 413 (6857) :708-711
[42]   X-ray emission from young brown dwarfs in the Orion Nebula Cluster [J].
Preibisch, T ;
McCaughrean, MJ ;
Grosso, N ;
Feigelson, ED ;
Flaccomio, E ;
Getman, K ;
Hillenbrand, LA ;
Meeus, G ;
Micela, G ;
Sciortino, S ;
Stelzer, B .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2005, 160 (02) :582-593
[43]   The evolution of X-ray emission in young stars [J].
Preibisch, T ;
Feigelson, ED .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2005, 160 (02) :390-400
[44]   Chandra X-ray observations of young clusters.: I.: NGC 2264 data [J].
Ramírez, SV ;
Rebull, L ;
Stauffer, J ;
Hearty, T ;
Hillenbrand, L ;
Jones, B ;
Makidon, R ;
Pravdo, S ;
Strom, S ;
Werner, M .
ASTRONOMICAL JOURNAL, 2004, 127 (05) :2659-2673
[45]   Herbig-Haro flows: Probes of early stellar evolution [J].
Reipurth, B ;
Bally, J .
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 2001, 39 :403-455
[46]   THE INTERSTELLAR EXTINCTION LAW FROM 1 TO 13 MICRONS [J].
RIEKE, GH ;
LEBOFSKY, MJ .
ASTROPHYSICAL JOURNAL, 1985, 288 (02) :618-621
[47]   X-ray modeling of very young early-type stars in the Orion Trapezium: Signatures of magnetically confined plasmas and evolutionary implications [J].
Schulz, NS ;
Canizares, C ;
Huenemoerder, D ;
Tibbets, K .
ASTROPHYSICAL JOURNAL, 2003, 595 (01) :365-383
[48]   A deep Chandra X-ray observation of the embedded young cluster in NGC 2024 [J].
Skinner, S ;
Gagné, M ;
Belzer, E .
ASTROPHYSICAL JOURNAL, 2003, 598 (01) :375-391
[49]   Collisional plasma models with APEC/APED: Emission-line diagnostics of hydrogen-like and helium-like ions [J].
Smith, RK ;
Brickhouse, NS ;
Liedahl, DA ;
Raymond, JC .
ASTROPHYSICAL JOURNAL, 2001, 556 (02) :L91-L95
[50]   Near-infrared study of M16: Star formation in the elephant trunks [J].
Sugitani, K ;
Tamura, M ;
Nakajima, Y ;
Nagashima, C ;
Nagayama, T ;
Nakaya, H ;
Pickles, AJ ;
Nagata, T ;
Sato, S ;
Fukuda, N ;
Ogura, K .
ASTROPHYSICAL JOURNAL, 2002, 565 (01) :L25-L28