The extreme high frequency peaked BL Lac 1517+656
ADS bibcode 1999A&A...352..395B
astro-ph/9910440
V. Beckmann [1], N. Bade [1], O. Wucknitz [1]
- Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
Abstract
We present optical spectroscopy data that allowed a measurement of the
redshift for the X-ray selected BL Lacertae object 1517+656. With a
redshift of z = 0.702 this object has an absolute magnitude of B =
-26.4 and is also an extremely powerful radio and X-ray
source. Although being a high frequency peaked BL Lac, this object is
one of the most luminous BL Lac objects known so far. Being also a
candidate for gravitational lensing, this object is of high interest
for the BL Lac research. Assuming several cosmological models and a
realistic redshift for the lensed object, we find that 1517+656 has a
mass > 2 * 10^12 solar masses and a high velocity dispersion > 350
km/sec.
Key words:
galaxies: BL Lacertae objects: general galaxies: BL Lacertae objects: individual: 1517+656 galaxies: distances and redshifts cosmology: gravitational lensing
A&A 352 (1999) 395 (link to online journal)
ADS bibcode 1999A&A...352..395B (link to ADS entry)
astro-ph/9910440 (link to e-print archive)
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