Frankfurt Quasar Monitoring


MRK 478
Object data

  Cross-Identifications   PG 1440+356, IRAS 14400+3539, PGC 52510
  2MASSi J1442074+352622, EUVE J1442+35.4
  FIRST J144207.4+352623, RX J1442.1+3526
  1AXG J144207+3526, 2XMM J144207.4+352622 
  GALEXASC J144207.57+352623.7, 1440+356
  SDSS J144207.47+352622.9, 1H 1429+370
  Markarian 478
  Equat. coordinates   RA  14 42 07.5     DE  +35 26 23     (J2000)
  Constellation   Bootes
  Type   QSO
  Redshift (2)   z=0.079
  Distance (2) (3)
  321 Mpc
  Total mag range (mv) (4)   14.3 - 14.8
  Catalog Magnitude (1)   14.58
  Absolute Magnitude (1)   -23.4 MB
  Light Travel-Time (2)   1.009 × 109 yrs
(1) Véron-Cetty & Véron 2006, A&A 455, 776
(2) NASA/IPAC Extragalactic Database
(3) Co-Moving Radial Distance
(4) Literature / FQM


Finding chart
1440+356_chart_fqm.jpg

Comparison stars

star B V
A 14.457 (0.063)
13.840 (0.061)
B 14.846 (0.073)
14.139 (0.066)
C 15.252 (0.048)
14.612 (0.066)
D 15.736 (0.193) 15.159 (0.118)
comparison stars from APASS (DR6)

Light curve
1440+356_lc2212_fqm.jpg

Colour chart A
1440+356_color_fqm.jpg
Credit: SDSS  /  Size 13´× 13´ /  Chart by S. Karge

Colour chart B
This 3´× 3´section from SDSS shows the quasar host of MRK 478 as a slightly
oval galaxy disk (apparent diameter 30"×20") with a bright stellar core.
1440+356_sdss_fqm.jpg
Credit: SDSS  /  Size 3´× 3´

Notes
Markarian 478 (MRK 478 for short) is a bright quasar in Bootes, about 3.5° SE of Gamma Bootis. MRK 478 was discovered in 1972 by the UV-Continuum-Survey run by Markarian et al. (MRK) at the Astrophysical Observatory in Byurakan/Armenia. Main goal was the spectroscopic search for "blue" galaxies with excessive UV-emission. MRK 478 was detected as a very compact, star-like object. As a blue star-like object it was also detected by both the Palomar-Green Bright Quasar Survey (PG) and the Extreme Ultraviolet Explorer (EUVE). The quasar host is a spiral galaxy with an apparent diameter of 30"×20". The host itself shows clear signs of disturbance, detectible as faint shells or arms. The very bright nucleus emits a Narrow-Line Seyfert 1-spectrum (NLS1), very similar to that found with I Zw 1.

MRK 478 is a low amplitude variable object with a total range of less than 1 magnitude. Visual observers need at least an 8- to 10-inch telescope to glimpse this stellar object. Using large aperture telescopes, the quasar becomes either star-like or a star-like object, enveloped by a very diffuse and small halo. With very large aperture and high power, observers may recognize a slightly bluish hue of the bright star-like nucleus, a result of the UV-excess of this active galactic nucleus.
CCD observers, as well as visual observers, shall use the comparison stars given above.
____________

Finding MRK 478 is an easy task due to its position 3.5° SE of Gamma Bootis. A little south of Gamma Bootis, a chain of stars of mag 6 and mag 7 directly point to the quasar. Only 1.5° NE, we find the faint galaxy NGC 5695, also known as MRK 686, an active galaxy with S2-spectrum. As with MRK 478, this AGN was also found by the UV-Continuum-Survey mentioned above.

Observers who like to track down some more very old quasi-stellar photons may turn to quasar PG 1411+442, a bright 14-mag object at a distance of about 1×109 light-years, some 10° NW of MRK 478.
Another bright
quasi-stellar object is PKS 1424+240, a variable 14-mag BL Lac object, located about 12° SSW of MRK 478.


Literature
de Grijp, M.H.K., Miley, G.K., et al. 1987, A&AS, 70, 95; Warm IRAS Sources. I. A Catalogue of AGN Candidates from
     the Point Source Catalogue (PSC).
Gondhalekar, P.M., Kellett, B.J., et al. 1994, MNRAS, 268, 973; ROSAT/XRT-PSPC Observations and the Ionizing
     Continuum of the Seyfert 1 Galaxy Mrk 478.
Hansen, T. 1991, Deep Sky Magazine 34, 32; The "Deepest" Deep Sky Objects.
Karge, S.; Helle Quasare für 8- bis 10-Zoll Teleskope. Ein Beobachtungsführer zur visuellen Beobachtung von Quasaren
     und BL Lacertae Objekten; Frankfurt 2005.
Khachikian, E.E., Weedman, D.W. 1974, ApJ, 192, 581; An Atlas of Seyfert Galaxies.
Markarian, B.E., Lipovetzki, V.A. 1972, Astrophysics, 8, 89; Galaxies with Ultraviolet Continuum V.
Peterson, B.M., Fricke, K., et al. 1981, PASP, 93, 281; UBV Photometry of Markarian and S0 galaxies.
Schmidt, M., Green, R.F. 1983, ApJ, 269, 352; Quasar Evolution derived from the Palomar Bright Quasar Survey and
     other complete Quasar Surveys.
Steinicke, W.; Katalog heller Quasare und BL Lacertae Objekte; Umkirch 1998.
Steinicke, W.; Beobachtungsliste für helle Quasare; Umkirch 1999.
Véron-Cetty, M.-P., Véron, P. 2001, A&A 374, 92; A Catalogue of Quasars and Active Nuclei: 10th edition.
Véron-Cetty, M.-P., Véron, P. 2003, A&A 412, 399; A Catalogue of Quasars and Active Nuclei: 11th edition.
Véron-Cetty, M.-P., Véron, P. 2006, A&A 455, 776; A Catalogue of Quasars and Active Nuclei: 12th edition.
Véron-Cetty, M.-P., Véron, P. 2010, A&A 518, 10; A Catalogue of Quasars and Active Nuclei: 13th edition.
Webb, W., Malkan, M. 2000, ApJS, 130, 165; Comparison star sequences for optical photometry of Active Galactic
     Nuclei and Quasars.

 


Links:

APASS

Chara/PEGA

Sloan Digital Sky Survey


© Stefan Karge  /  last obs. 2022-12-21






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