MS 1221.8+2452 multiwavelength SED

Also known as 1FLAT J122424.2+243623, 2WHSP J122424.1+243623, 3FGL J1224.5+2436, 3HSP J122424.2+243624, 5BZB J1224+2436, BZB J1224+2436, MS 12218+2452, NVSS J122424+243623.

• Class: BL Lac
• Redshift: z = 0.219
• Position (ICRS): RA 186.10078°, Dec 24.60653°
• Data: 3,805 points (20 upper limits) from 35 catalogues
• Dated data: 2007–2024 (MJD 54282–60610)
• Undated catalogue values: 77
• Frequency range of detections: log ν = 8.2–26.2 [Hz] (radio, microwave, infrared, optical, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 164 UVOT and 204 XRT
• Largest catalogues (points): ZTF (1,736), ASAS-SN (756), NEOWISE (608), MMDCXRT (313), WISEME (78)

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=186.10078, dec=24.60653, name="MS 1221.8+2452")

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

Other BL Lac objects

• ON 246
• TXS 1221+229
• W Comae
• B2 1229+29
• PG 1218+304
• B2 1215+30

How to cite

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