4C +56.27 multiwavelength SED

Also known as 1FGL J1824.0+5651, 1FLAT J182407.0+565059, 1Jy 1823+568, 2FGL J1824.0+5650, 3FGL J1824.2+5649, 4C56.27, 5BZB J1824+5651, BZB J1824+5651, CRATES J182406+565059, S41823+568, TXS 1823+568, WMAP53, WMAP5 J1824+5650.

• Class: BL Lac
• Redshift: z = 0.664
• Position (ICRS): RA 276.02945°, Dec 56.85041°
• Data: 2,673 points (9 upper limits) from 33 catalogues
• Dated data: 1997–2024 (MJD 50732–60644)
• Undated catalogue values: 92
• 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: 236 UVOT and 18 XRT
• Largest catalogues (points): XRTSPEC (588), OULC (567), ASAS-SN (376), MMDCXRT (369), MMDCOUV (210)

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=276.02945, dec=56.85041, name="4C +56.27")

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

Other BL Lac objects

• I Zw 187
• 3C 371
• S4 1749+70
• 1ES 1959+650
• RBS 1555
• B3 1659+399

How to cite

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