|Frankfurt Quasar Monitoring|
|Cross-Identifications|| LEDA 139042, IRAS F07546+3928, MS 0754.6+3928
FBQS J075800.0+392029, 1RXS J075759.7+392036
B3 0754+394, 1E 0754.6+3928, 2E 0754.6+3928
SDSS J075800.05+392029.0, QSO B0754+394
2MASS J0758000+392029, 0754+394
|Equat. coordinates||RA 07 58 00.1 DE +39 20 29 (J2000)|
| Redshift (1)
| Distance (2) (3)
|Total mag range (mv) (4) (5)||14.36 - 14.7|
|Catalog Magnitude (1)||14.36|
|Absolute Magnitude (1)||-24.1 MB|
|Light Travel-Time (2)||1.299 × 109 yrs|
|1||14.529 (0.013)||13.799 (0.008)||13.399 (0.009)|
|2||13.752 (0.015)||13.300 (0.009)||13.031 (0.011)|
|3||13.811 (0.014)||13.001 (0.009)||12.543 (0.010)|
|4||14.920 (0.016)||14.358 (0.010)||14.032 (0.012)|
|5||14.830 (0.017)||14.269 (0.010)||13.943 (0.011)|
|6||14.999 (0.016)||14.471 (0.011)||14.157 (0.012)|
|B3 0754+394 is a radio-quiet quasar in southern
Lynx, about 8.8° NE of Castor (Alpha Gem). The designation B3
0754+394 refers to the 3rd Bologna Radio Catalogue (B3),
where this object was cataloged as a rather weak radio source. Initially,
B3 0754+394 was
discovered as an
X-ray source (1E). Follow-up spectroscopy led to the classification as
an AGN with Seyfert 1-spectrum.
resolution images revealed a host galaxy (LEDA) with a very bright
centre (QSO) and hints of spiral structure.
The SDSS image and
HST image (see
above) clearly show its extended optical appearance. In
addition, an apparent companion galaxy was found at a projected
separation of 9.5" (true distance 19 kpc), which may have triggered the
0754+394. The host galaxy of QSO B3 0754+394 is an outlying member of
galaxy cluster Abell 607, with its center located some 7arcmin W of the QSO
position. According to the CDS database both objects share the same
redshift. Some cluster galaxies can be seen in the charts above. |
B3 0754+394 is a small amplitude variable object with a total range of less than 1 magnitude. Observations by the Frankfurt Quasar Monitoring programme have shown the quasar ranging only between mag 14.4-14.7. Therefore, this quasar is an easy task for visual observers with telescopes of 10-inch of aperture and larger. CCD observers, as well as visual observers, shall use the comparison stars given above.
Another quasi-stellar object, quasar PG 0844+349, is a bright 14-mag object at a distance of about 0.8×109 light-years, 11° ESE of quasar B3 0754+394.
Only 4° to the east, another interesting deep sky object is waiting for observers: NGC 2419, dubbed the "Intergalactic Wanderer". NGC 2419 is a globular cluster which is located at the outskirts of the Milky Way galaxy, at a distance of about 300 000 light-years. A paper, published by Mackey et al. (2010), raised evidence that NGC 2419 is not a globular cluster, but the remnant of a dwarf galaxy, swallowed by the Milky Way.
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Sterne und Weltraum 2-2015 (article, spectrum)
Sloan Digital Sky Survey