S2 0109+22 multiwavelength SED

Also known as 1FGL J0112.0+2247, 1FLAT J011205.8+224438, 1OUNYU J011206+2244.6, 2E 0109.3+2228, 2FGL J0112.1+2245, 3FGL J0112.1+2245, 5BZB J0112+2244, BZB J0112+2244, CRATES J011205+224448, GC0109+224, TXS 0109+224.

• Class: BL Lac
• Redshift: z = 0.265
• Position (ICRS): RA 18.02427°, Dec 22.74411°
• Data: 2,302 points (64 upper limits) from 43 catalogues
• Dated data: 2006–2025 (MJD 53762–60878)
• Undated catalogue values: 124
• Frequency range of detections: log ν = 7.9–26.2 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 320 UVOT and 95 XRT
• Largest catalogues (points): NEOWISE (571), MMDCGR (387), ZTF (276), MMDCNuX (206), MMDCOUV (160)

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=18.02427, dec=22.74411, name="S2 0109+22")

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

Other BL Lac objects

• 1ES 0120+340
• B2 0201+24
• RBS 0042
• MS 0205.7+3509
• B3 0045+395
• TXS 0159+085

How to cite

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