| SDSS J1715+6008 | |
|---|---|
 The Seyfert 2 galaxy SDSS J1715+6008. | |
| Observation data (J2000.0epoch) | |
| Constellation | Draco |
| Right ascension | 17h 15m 44.02s[1] |
| Declination | +60° 08′ 35.50″[1] |
| Redshift | 0.156857[1] |
| Heliocentric radial velocity | 47,025km/s ± 4[1] |
| Distance | 2.022Gly |
| Apparent magnitude (V) | 18.66 |
| Apparent magnitude (B) | 19.51 |
| Characteristics | |
| Type | QSO2[1] |
| Size | ~137,600 ly (42.20 kpc) (estimated)[1] |
| Other designations | |
| 1715+6011, 5MUSES 305,NVSS J171543+600833,LEDA 3137164,2MASS J17154401+6008352,SDSS J171544.02+600835.4, QFeedS J1715+6008[1] | |
SDSS J1715+6008 is an activeSeyfert type 2 galaxy[2] located in the constellation ofDraco. Theredshift of the galaxy is (z) 0.156[1] and it was first discovered as anastronomical radio source from theFaint Images of the Radio Sky at Twenty-Centimeters survey byastronomers in 1997.[3] This galaxy is also known to host twoactive galactic nuclei (AGN) based on evidence of two X-ray sources, with a separation of 1.9 kiloparsecs from each other.[4][5][6]
SDSS J1715+6008 is classified as both a radio-quiet (RQ)quasar and adoubly ionized oxygen (O II) emitter.[7][8] Its host appears to have an undisturbed appearance based onSloan Digital Sky Survey imaging, without any prominent companions or tidal features. This is somewhat unusual despite the presence of twobinary black holes, although there are signs of weakly disturbed features located within its central regions.[4][8] The black holes are estimated to have formed around 0.5 to 1 billion years ago and each has an estimated total mass of 7.2 × 1010Mʘ.[8][9] The total [O II]luminosity of the black holes is approximately 3.6 × 1042 erg s−1.[9]
A study published in 2015 foundinterstellar gas in the form of arotating disk which extends outwards by manykiloparsecs. The stellar line features are however in opposite directions, indicating bi-conical outflows.[8] In itsoptical spectrum SDSS J1715+6008 displays severalemission lines, with one of the peaks described asblueshifted, with its [O ii] peaks mainly separated by around 350 kilometers per seconds.[4]
The radio structure of SDSS J1715+6008 is complex. Radio imaging made with theVery Large Array (VLA) has found there is a bright source in the center with extendedradio emission. At 11.5GHz frequencies the source is described as extended, with secondary peaks of emission located southwest from the nucleus, a resolved radio core and two flatspectrum regions. There is also aradio jet on one side. There is also evidence theionized outflows are mainly driven by its own jet.[10]
