Frankfurt Quasar Monitoring


PG 0844+349
Object data

  Cross-Identifications    TON 951, CSO 204, FBS 0844+349, PGC 24702
  LEDA 24702, 1ES 0844+349, 2E 0844.5+3456
  2MASSi J0847424+344504, RX J0847.6+3445
  SDSS J084742.46+344504.4, 0844+349
  Equat. coordinates   RA  08 47 42.5     DE  +34 45 05     (J2000)
  Constellation   Lynx
  Type   QSO
  Redshift   z=0.064
  Distance (2) (3)
  262 Mpc
  Total mag range (mv) (4)   13.67 - 15.28
  Catalog Magnitude (1)   14.50
  Absolute Magnitude (1)   -23.1 MB
  Light Travel-Time (2)   0.829 × 109 yrs
(1) Véron-Cetty & Véron 2006, A&A 455, 776
(2) NASA/IPAC Extragalactic Database
(3) Co-Moving Radial Distance
(4) Literature

Finding chart
0844+349_chart_fqm.jpg

Comparison stars

star B V
1 14.533 (0.033)
13.999 (0.024)
2 14.915 (0.033)
14.253 (0.039)
3 15.028 (0.047) 14.455 (0.039)
4
15.225 (0.080) 14.703 (0.053)
5
15.844 (0.038) 15.394 (0.072)
comparison stars from APASS (DR6)

Colour chart
0844+349_color_fqm.jpg
Credit: SDSS  /  Size 13´× 13´ /  Chart by S. Karge

Quasar PG 0844+349
This 2´× 2´section from SDSS shows the irregular spiral structure of the quasar host, as well as
the interacting spiral galaxy 2MASX J08474179+3444405 with extended tidal arms.
0844+349_sdss-sm_fqm.jpg
Credit: SDSS  /  Size 2´× 2´

Light curve
0844+349_lc2106_fqm.jpg

Notes
PG 0844+349 is a radio-quiet quasar in southern Lynx, close to the constellation Cancer. The designation PG 0844+349 refers to the Palomar-Green Bright Quasar Survey (PG), where this object was identified as a blue stellar object. Independently, it was discovered by mexican Tonantzintla Blue Stellar Object Survey (TON), searching for blue stellar objects as quasar candidates. Spectroscopic investigations revealed a Seyfert-1 spectrum, which led to the quasar classification. PG 0844+349 is a low luminosity quasar at a distance of about 800 million light-years. The central supermassive black hole has an estimatet mass of 0.9x108 solar masses.
A close inspection of images taken by POSS and SDSS (see above) easily reveals the host galaxy of quasar PG 0844+349 as a face-on spiral galaxy with an apparent diameter of 0.45×0.32 arcminutes. Close to the SE, a companion galaxy (2MASX J08474179+3444405) can be found at an apparent distance of some 20". Obviously, both galaxies show clear signs of tidal interaction, like tidal arms and a hot blue stellar component. This galaxy/quasar situation is a good example for AGN activity triggered by tidal interaction.

PG 0844+349 is a small amplitude variable object with a total range of about 1.5 magnitudes. Observations by the Frankfurt Quasar Monitoring programme have shown the quasar as a bright object, ranging between 14.1 - 14.8 mag, which makes it an interesting object for visual observers with telescopes of 10- to 12-inch of aperture and larger. CCD observers, as well as visual observers, shall use the comparison stars given above.
____________

Observers who like to track down some more very old quasi-stellar photons may turn to quasar B3 0754+394, a bright 14-mag object at a distance of about 1.2×109 light-years, 11° WNW of PG 0844+349.
Another 14-mag quasar is PG 0953+415 at a distance of about 2.5×109
light-years, some 15° NE in Leo Minor. And finally, sweep the telescope 14.7° to the south: Here we find OJ 287, a violently variable BL Lac object, close to open cluster M44, the “beehive”.

Only 11´ SE of quasar
PG 0844+349 observers find the bright double star WDS 08483+3436=ADS 7000 (A=8m.07, B=10m.19, AB=19.1“, 340°), see finding chart above (WDS at lower left corner).
A deep sky showpiece can be found about 1.7° SE: NGC 2683, a large and bright edge-on galaxy. Another 13-mag galaxy, NGC 2649, is a small face-on spiral only 0.75° W of quasar PG 0844+349
.


Literature
Boroson, T.A., Green, R.F. 1992, ApJS, 80, 109; The Emission-Line Properties of Low-Redshift Quasi-Stellar Objects.
Bowen, D.V., Osmer, S.J., Blades, J.C., et al. 1994, AJ, 107, 461; Hubble Space Telescope Faint Object Spectrograph
     QSO Absorption Snapshot Survey (ABSNA).
Chavira, E. 1959, BOTT, 2, 3; Estrellas azules en el Casquete Galactico Norte - II.
Elvis, M., Wilkes, B.J., McDowell, J.C. 1994, ApJS, 95, 1; Atlas of Quasar Energy Distributions.
Giveon, U., Maoz, D., et al. 1999, MNRAS, 306, 637G; Long-term Optical Variability Properties of the Palomar-Green
     Quasars.
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.
Peterson, B. M., Ferrarese, L., Gilbert, K. M., et al. 2004, ApJ, 613, 682; Central Masses and Broad-Line Region
     Sizes of Active Galactic Nuclei. II.
Richards, G.T., Yanny, B., et al. 1997, PASP, 109, 39R; Quasar Photometry with the SDSS Monitor Telescope.
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.
Wilkes, B.J., Kuraszkiewicz, J., Green, P.J., et al. 1999, ApJ, 513, 76; Investigation of the Relation between the
     Spectral Energy Distributions and the Emission Lines in Low-Redshift Quasars.




Links:

PG 0844+349 (Sasmirala, Univ. Heidelberg)

Sloan Digital Sky Survey

APASS


© Stefan Karge  /  last obs. 2021-06-16






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