3C 66A multiwavelength SED

Names and position

Also known as 1FGL J0222.6+4302, 2EG J0220+4228, 2FGL J0222.6+4302, 2FHL J0222.6+4301, 3FGL J0222.6+4301, 4FGL J0222.6+4302, 5BZB J0222+4302, BZB J0222+4302.

• Class: BL Lac
• Fermi-LAT (4FGL): 4FGL J0222.6+4302
• Position (ICRS): RA 35.66505°, Dec 43.03550°
• Galactic: l 140.143°, b −16.767°

Other names and measurements: NED and SIMBAD within 5″ of this position.

The SED

• Data: 6,458 points (4 upper limits) from 43 catalogues
• Dated data: 1999–2025 (MJD 51209–60968)
• Undated catalogue values: 764
• Frequency range of detections: log ν = 7.9–26.2 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 886 UVOT and 515 XRT
• Largest catalogues (points): ZTF (2,052), ASAS-SN (1,414), MMDCXRT_ORBIT (657), SUFST (639), MMDCOUV (443)

Data by band

All 7 bands have data. The infrared band has the most points, 2,215 of 6,458; its largest catalogue is ZTF with 2,052.

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=35.66505, dec=43.0355, name="3C 66A")

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

Nearby sources

• MS 0205.7+3509, 8.1° away
• OC 457, 9.3° away
• IC 310, 10.1° away
• NGC 1275, 10.7° away

Other BL Lac objects

• 1ES 0120+340
• B3 0045+395
• B2 0201+24
• 1ES 0229+200
• S2 0109+22
• PKS 0235+164

How to cite

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