B2 1229+29 multiwavelength SED

Also known as 1FGL J1231.6+2850, 1FLAT J123143.6+284749, 3FGL J1231.7+2847, 3HSP J123143.6+284749, 3HSP J123143.6+284750, 5BZB J1231+2847, BZB J1231+2847, CRATES J123144+284803, FBQS J123143.5+284749, SDSS J123143.57+284749.7, TXS 1229+290.

• Class: BL Lac
• Redshift: z = 0.236
• Position (ICRS): RA 187.93155°, Dec 28.79716°
• Data: 2,952 points (16 upper limits) from 39 catalogues
• Dated data: 2008–2025 (MJD 54737–60969)
• Undated catalogue values: 99
• Frequency range of detections: log ν = 8.6–26.2 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 40 UVOT and 25 XRT
• Largest catalogues (points): ZTF (1,906), NEOWISE (652), PanSTARRS-LC (84), WISEME (74), MMDCGR (61)

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=187.93155, dec=28.79716, name="B2 1229+29")

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

Other BL Lac objects

• W Comae
• PG 1218+304
• B2 1215+30
• ON 246
• MS 1221.8+2452
• TXS 1221+229

How to cite

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