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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Interpretation of the 115 day periodic modulation in the X-ray flux of NGC 5408 X-1
Astrophysical Journal, Volume 725, No. 2, Year 2010
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Description
We comment on the recent observation of a 115 day modulation in the X-ray flux of the ultraluminous X-ray source (ULX) NGC 5408 X-1, and in particular, the interpretation of this modulation as the orbital period. We suggest that this modulation may instead be due to a precessing jet, and is thus superorbital in nature. Comparing the properties of this ULX with those of the prototypical micro-quasar SS 433, we argue that NGC 5408 X-1 is very similar to SS 433: a hyper-accreting stellar-mass black hole in a shorter-period binary. If the analogy holds, the 115 day modulation is best explained by the still poorly understood physics of inner-disk/jet precession and a longer observing baseline would be able to reveal an intrinsic phase jitter that is associated with such a precession. © 2010 The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Foster, D. L.
South Africa, Cape Town
South African Astronomical Observatory
United States, Nashville
Vanderbilt University
Charles, Philip A.
South Africa, Cape Town
South African Astronomical Observatory
United Kingdom, Southampton
University of Southampton
Holley-Bockelmann, Kelly
United States, Nashville
Vanderbilt University
United States, Nashville
Fisk University
Statistics
Citations: 16
Authors: 3
Affiliations: 4
Identifiers
Doi:
10.1088/0004-637X/725/2/2480
ISSN:
0004637X
e-ISSN:
15384357