TXS 1221+229 multiwavelength SED

Also known as 1FLAT J122401.0+223939, 3HSP J122401.0+223939, 5BZB J1224+2239, BZB J1224+2239, CRATES J122400+223930.

• Class: BL Lac
• Redshift: z = 0.482
• Position (ICRS): RA 186.00432°, Dec 22.66099°
• Data: 4,194 points (59 upper limits) from 28 catalogues
• Dated data: 2009–2024 (MJD 54991–60613)
• Undated catalogue values: 70
• Frequency range of detections: log ν = 8.2–26.2 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Largest catalogues (points): ZTF (3,188), NEOWISE (614), WISEME (156), PanSTARRS-LC (104), ASAS-SN (62)

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=186.00432, dec=22.66099, name="TXS 1221+229")

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

Other BL Lac objects

• MS 1221.8+2452
• ON 246
• W Comae
• B2 1229+29
• TXS 1252+224
• PG 1218+304

How to cite

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