| Issue |
A&A
Volume 421, Number 1, July I 2004
|
|
|---|---|---|
| Page(s) | 13 - 15 | |
| Section | Astrophysical processes | |
| DOI | https://doi.org/10.1051/0004-6361:20034569 | |
| Published online | 11 June 2004 | |
Research Note
Mass accretion rate of the galactic black hole A0620-00 in its quiescent state
1
Centre for Space Physics, Chalantika 43, Garia Station Rd., Kolkata, 700084, India
2
S. N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata, 700098, India e-mail: chakraba@bose.res.in
Corresponding author: S. Pal, space_phys@vsnl.com
Received:
24
October
2003
Accepted:
14
March
2004
Our recent radio observation using the Giant Meter Radio Telescope (GMRT)
of the galactic black hole transient A0620-00 at 1.280 GHz revealed a micro-flare
of a few milli-Jansky. Assuming an equipartition of magnetic energy and
the gravitational potential energy of accreting matter, it is possible
to estimate the upper limit of the accretion rate.
Assuming a black hole mass of 
residing at the center, we
find this to be at most 
yr-1. This is consistent with earlier estimates of accretion rates
based on optical and X-ray observations.
Key words: black hole physics / accretion, accretion disks / magnetic fields / radio continuum: general / techniques: photometric / methods: observational
© ESO, 2004
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