Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...489l..63s&link_type=abstract
Astrophysical Journal Letters v.489, p.L63
Astronomy and Astrophysics
Astronomy
32
Stars: Formation, Ism: Jets And Outflows, X-Rays: Stars, Radio Lines: Stars, Radio Lines: Ism
Scientific paper
We report CO (J = 2--1, J = 1--0) outflows from four X-ray--emitting protostars (EL29, IRS44, WL6, WL10) in the rho Ophiuchi cloud core which have been firmly identified with the X-ray satellite ASCA. The common feature of these outflows is that the blue and red lobes are largely overlapped, which indicates that the inclination angle between the outflow axis and line of sight is smaller than 30 deg (nearly pole-on configuration). Taking account of the hard X-ray transparency (NH ~ 1023 cm-2) and the column density of a circumstellar disk (NH > 1024 cm-2), it is naturally understood that hard X-rays emitted near the surface of protostars or the inner part of the disk are observed in the nearly pole-on configuration. The outflow detection rate (4/5) in the present observations shows that a low-mass protostar emits X-rays even in the outflow phase of early stellar evolution.
Hirano Naomi
Koyama Katsuji
Sekimoto Yutaro
Tatematsu Ken'ichi
Tsuboi Yohko
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