1ES 1255+244 multiwavelength SED

Also known as 1FLAT J125731.9+241240, 1OUNYU J125732+2412.6, 2WHSP J125731.9+241239, 3HSP J125731.9+241240, 5BZB J1257+2412, BZB J1257+2412, RBS1189, SHBL J125731.9+241240.

• Class: BL Lac
• Redshift: z = 0.141
• Position (ICRS): RA 194.38304°, Dec 24.21114°
• Data: 2,192 points (32 upper limits) from 34 catalogues
• Dated data: 1998–2024 (MJD 50984–60456)
• Undated catalogue values: 78
• Frequency range of detections: log ν = 8.2–25.4 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 140 UVOT and 67 XRT
• Largest catalogues (points): ASAS-SN (1,132), NEOWISE (552), WISEME (117), MMDCXRT (98), PanSTARRS-LC (68)

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=194.38304, dec=24.21114, name="1ES 1255+244")

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

Other BL Lac objects

• TXS 1252+224
• ON 246
• B2 1229+29
• MS 1221.8+2452
• TXS 1221+229
• W Comae

How to cite

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