1ES 1959+650 multiwavelength SED

Names and position

Also known as 1FGL J2000.0+6508, 1FLAT J195959.8+650854, 1OUNYU J195960+6508.8, 1RXS J200000.0+650854, 2FGL J2000.0+6509, 2FHL J2000.1+6508, 2WHSP J195959.8+650853, 3FGL J2000.0+6509, 3HSP J195959.8+650855, 4FGL J2000.0+6508, 5BZB J1959+6508, BZB J1959+6508, CRATES J195958+650900, TeV J1959+651, TXS 1959+650.

• Class: BL Lac
• Redshift: z = 0.047
• Fermi-LAT (4FGL): 4FGL J2000.0+6508
• Position (ICRS): RA 299.99938°, Dec 65.14851°
• Galactic: l 98.003°, b 17.670°

Other names and measurements: NED and SIMBAD within 5″ of this position.

The SED

• Data: 34,914 points (13 upper limits) from 37 catalogues
• Dated data: 1997–2025 (MJD 50572–60906)
• Undated catalogue values: 363
• Frequency range of detections: log ν = 8.2–26.4 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 7,942 UVOT and 13,566 XRT
• Largest catalogues (points): MMDCXRT (29,071), MMDCOUV (2,777), ASAS-SN (1,792), MMDCNuX (423), UVOT (256)

Data by band

All 7 bands have data. The X-ray band has the most points, 29,644 of 34,914; its largest catalogue is MMDCXRT with 29,071.

Get the data

• The SED as CSV from the MMDC SED API (docs.mmdc.am).
• In Python, with astro-mmdc:

  from astro_mmdc import MMDC
  sed = MMDC().sed.get(ra=299.99938, dec=65.14851, name="1ES 1959+650")

• The interactive SED plot, with time filtering and modeling (needs JavaScript).

Nearby sources

• 87GB 200541.3+641601, 60′ away
• TXS 1933+655, 2.8° away
• S4 1849+67, 7.4° away
• S4 1842+68, 8.2° away

Other BL Lac objects

• 3C 371
• S5 2007+77
• S4 1749+70
• 4C +56.27
• S5 1803+784
• I Zw 187

How to cite

Sahakyan, N., Vardanyan, V., Giommi, P., et al. 2024, AJ, 168, 289, doi:10.3847/1538-3881/ad8231 (arXiv:2410.01207).