Unidentified galactic X-ray sources positioned with the HEAO-1 scanning modulation collimator

1980 ◽  
Vol 85 ◽  
pp. 1062 ◽  
Author(s):  
C. A. Reid ◽  
M. D. Johnston ◽  
H. V. Bradt ◽  
R. E. Doxsey ◽  
R. E. Griffiths ◽  
...  
Keyword(s):  
X Ray ◽  
Modulation Collimator

Two X-ray-selected BL Lacertae objects observed with the HEAO 1 scanning modulation collimator

1989 ◽  
Vol 345 ◽  
pp. 140 ◽  
Author(s):  
R. A. Remillard ◽  
I. R. Tuohy ◽  
R. J. V. Brissenden ◽  
D. A. H. Buckley ◽  
D. A. Schwartz ◽  
...  
Keyword(s):  
Bl Lacertae Objects ◽  
X Ray ◽  
Bl Lacertae ◽  
Modulation Collimator

HEAO 1 scanning modulation collimator discovery of an extended X-ray source at Cygnus A

1979 ◽  
Vol 230 ◽  
pp. L67 ◽  
Author(s):  
G. Fabbiano ◽  
D. A. Schwartz ◽  
J. Schwarz ◽  
R. E. Doxsey ◽  
M. Johnston
Keyword(s):  
X Ray ◽  
Cygnus A ◽  
Modulation Collimator

X-ray locations and sizes of clusters of galaxies observed with the HEAO 1 scanning modulation collimator

1979 ◽  
Vol 231 ◽  
pp. L105 ◽  
Author(s):  
J. Schwarz ◽  
U. Briel ◽  
G. Fabbiano ◽  
R. E. Griffiths ◽  
D. A. Schwartz ◽  
...  
Keyword(s):  
Clusters Of Galaxies ◽  
X Ray ◽  
Modulation Collimator

scholarly journals Evidence for a Black Hole in LMC X-3

1984 ◽  
Vol 108 ◽  
pp. 241-242
Author(s):  
A. P. Cowley ◽  
D. Crampton ◽  
J. B. Hutchings ◽  
R. Remillard
Keyword(s):  
Black Hole ◽  
Mass Function ◽  
Orbital Elements ◽  
Orbital Inclination ◽  
X Ray ◽  
Average Mass ◽  
Early Type Star ◽  
Optical Star ◽  
Modulation Collimator ◽  
Einstein Observatory

The best X-ray position (Einstein Observatory HRI - Giacconi et al 1979) for LMC X-3 confirms its identification with the early type star first suggested by Warren and Penfold (1975). Our spectroscopic observations obtained with the CTIO 4–m telescope show the WP star is a slightly reddened B3 V star with mV ≈ 16.9. Large radial velocity variations (Δv ≈ 500 km s−1) reveal an orbital period of 1.7049 days. From the orbital elements (Table 1) one can determine the mass function f(M) = (Mx sin i)3/(Mopt + Mx)2 = 2.3 M⊙, which shows without any assumptions about the mass of the optical star, the orbital inclination, or the mass ratio the unseen X-ray object has a mass >2.3 M⊙. Detailed analysis of the HEAO–1 scanning modulation collimator X-ray data shows that the system does not eclipse, implying that the orbital inclination is ≤ 65°. Assuming the B star mass lies between 4 and 8 M⊙ (an average mass for a normal B3 V star would be about 6–7 M⊙), the mass of the unseen companion must lie between 7 and 13 M⊙ (see Fig. 4a - Hutchings, this volume). Smaller inclinations of course give even higher masses. An important point is that the unseen star must have a mass larger than that of the B star, and thus if it were any kind of normal star it should be easily seen in the spectrum. Thus the X-ray emitting object is a very good candidate for a black hole.

scholarly journals A Multi-Wavelength Study of X-ray Selected AGN

1989 ◽  
Vol 134 ◽  
pp. 199-200
Author(s):  
R. J. V. Brissenden ◽  
I. R. Tuohy ◽  
G. V. Bicknell ◽  
R. A. Remillard ◽  
D. A. Schwartz
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
High Energy ◽  
Astronomy Observatory ◽  
X Ray ◽  
Preliminary Results ◽  
Multi Wavelength ◽  
Uv Excess ◽  
Modulation Collimator

A sample of Active Galactic Nuclei (AGN) have been discovered during a program to identify the optical counterparts of X-ray sources detected by the Modulation Collimator experiment of the High Energy Astronomy Observatory-1 (HEAO-1). UV-excess techniques were used to identify the X-ray sources (Remillard et al. 1986) and the details of the identifications are given elsewhere (Remillard et al. 1988, Brissenden et al. 1988). We report here the preliminary results of a multi-wavelength study of these new AGN.

Location of pulsating binary X-ray source 4U1538 – 52 with the HEAO-1 scanning modulation collimator

Nature ◽  
1978 ◽  
Vol 275 (5680) ◽  
pp. 517-518
Author(s):  
D. A. SCHWARTZ ◽  
H. GURSKY ◽  
J. SCHWARZ ◽  
H. BRADT ◽  
R. DOXSEY
Keyword(s):  
X Ray ◽  
Modulation Collimator

scholarly journals A Balloon-Borne X-Ray Telescope

1971 ◽  
Vol 41 ◽  
pp. 184-184
Author(s):  
M. Fujii ◽  
M. Matsuoka ◽  
S. Miyamoto ◽  
J. Nishimura ◽  
M. Oda ◽  
...  
Keyword(s):  
Angular Resolution ◽  
X Ray ◽  
Modulation Collimator

A balloon-borne X-ray instrument with the modulation collimator was designed and constructed to study the structure of solar X-ray flares. The angular resolution was approximately one arc minute. The instrument was used on an occasion of X-ray flare on Sept. 27, 1970.

Location of the recurrent /LMC/ X-ray transient A0538-66 with the HEAO 1 scanning modulation collimator

1979 ◽  
Vol 230 ◽  
pp. L11 ◽  
Author(s):  
M. D. Johnston ◽  
H. V. Bradt ◽  
R. E. Doxsey ◽  
R. E. Griffiths ◽  
D. A. Schwartz ◽  
...  
Keyword(s):  
X Ray ◽  
Modulation Collimator

X-ray emitting BL Lacertae objects located by the scanning modulation collimator experiment on HEAO 1

1979 ◽  
Vol 229 ◽  
pp. L53 ◽  
Author(s):  
D. A. Schwartz ◽  
R. E. Griffiths ◽  
J. Schwarz ◽  
R. E. Doxsey ◽  
M. D. Johnston
Keyword(s):  
Bl Lacertae Objects ◽  
X Ray ◽  
Bl Lacertae ◽  
Modulation Collimator

A modulation collimator for X-ray astronomy at high energies

1984 ◽  
Vol 17 (7) ◽  
pp. 577-580
Author(s):  
R Lieu ◽  
K J Beurle ◽  
A R Engel ◽  
J J Quenby
Keyword(s):  
X Ray ◽  
High Energies ◽  
Modulation Collimator
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