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- Q373148 subject Q7215984.
- Q373148 subject Q8285181.
- Q373148 subject Q8302744.
- Q373148 subject Q8691170.
- Q373148 abstract "BL Lacertae or BL Lac is a highly variable, extragalactic AGN (active galactic nucleus or active galaxy). It was first discovered by Cuno Hoffmeister in 1929, but was originally thought to be an irregular variable star in the Milky Way galaxy and so was given a variable star designation. In 1968, the "star" was identified by John Schmitt at the David Dunlap Observatory as a bright, variable radio source. A faint trace of a host galaxy was also found. In 1974, Oke and Gunn measured the redshift of BL Lacertae as z = 0.07, corresponding to a recession velocity of 21,000 km/s with respect to the Milky Way. The redshift figure implies that the object lies at a distance of 900 million light years.BL Lacertae is the original member of a type of blazar known as "BL Lacertae objects"; also termed simply "BL Lac objects". This class is distinguished by optical spectra devoid of the broad emission lines characteristic of quasars. On occasion, however, BL Lacertae has been observed to display weak emission lines.BL Lacertae changes in apparent magnitude over fairly small time periods between values of 14 and 17. Its location in the sky for epoch 2000.0 is at RA 22h 02m 43.3s, DEC +42° 16′ 40″.".
- Q373148 wikiPageExternalLink sim-basic?Ident=BL+Lac&submit=SIMBAD+search.
- Q373148 wikiPageExternalLink 0101.shtml.
- Q373148 wikiPageWikiLink Q10430.
- Q373148 wikiPageWikiLink Q1152925.
- Q373148 wikiPageWikiLink Q124313.
- Q373148 wikiPageWikiLink Q13442.
- Q373148 wikiPageWikiLink Q1931185.
- Q373148 wikiPageWikiLink Q195385.
- Q373148 wikiPageWikiLink Q221221.
- Q373148 wikiPageWikiLink Q2703.
- Q373148 wikiPageWikiLink Q318.
- Q373148 wikiPageWikiLink Q321.
- Q373148 wikiPageWikiLink Q46587.
- Q373148 wikiPageWikiLink Q531487.
- Q373148 wikiPageWikiLink Q593448.
- Q373148 wikiPageWikiLink Q6243.
- Q373148 wikiPageWikiLink Q7215984.
- Q373148 wikiPageWikiLink Q76250.
- Q373148 wikiPageWikiLink Q76287.
- Q373148 wikiPageWikiLink Q77083.
- Q373148 wikiPageWikiLink Q8285181.
- Q373148 wikiPageWikiLink Q8302744.
- Q373148 wikiPageWikiLink Q83373.
- Q373148 wikiPageWikiLink Q8691170.
- Q373148 comment "BL Lacertae or BL Lac is a highly variable, extragalactic AGN (active galactic nucleus or active galaxy). It was first discovered by Cuno Hoffmeister in 1929, but was originally thought to be an irregular variable star in the Milky Way galaxy and so was given a variable star designation. In 1968, the "star" was identified by John Schmitt at the David Dunlap Observatory as a bright, variable radio source. A faint trace of a host galaxy was also found.".
- Q373148 label "BL Lacertae".