BL Lac multiwavelength SED

Names and position

Also known as 1FGL J2202.8+4216, 1FLAT J220243.3+421639, 1Jy 2200+420, 1OUNYU J220243+4216.6, 2FGL J2202.8+4216, 2FHL J2202.7+4216, 3FGL J2202.7+4217, 4FGL J2202.7+4216, 5BZB J2202+4216, BLLacertae, BZB J2202+4216, S42200+420, TXS 2200+420, WMAP58, WMAP5 J2202+4217.

• Class: BL Lac
• Redshift: z = 0.0668
• Fermi-LAT (4FGL): 4FGL J2202.7+4216
• Position (ICRS): RA 330.68038°, Dec 42.27777°
• Galactic: l 92.590°, b −10.441°

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

The SED

• Data: 29,852 points (426 upper limits) from 48 catalogues
• Dated data: 1997–2025 (MJD 50760–60969)
• Undated catalogue values: 445
• Frequency range of detections: log ν = 7.9–25.9 [Hz] (radio, microwave, infrared, optical, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 8,474 UVOT and 6,796 XRT
• Largest catalogues (points): MMDCXRT_ORBIT (7,290), MMDCXRT (6,046), MMDCOUV (4,237), MMDCGR (2,626), ASAS-SN (2,434)

Data by band

6 of the 7 bands have data. The X-ray band has the most points, 17,147 of 29,852; its largest catalogue is MMDCXRT_ORBIT with 7,290.

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=330.68038, dec=42.27777, name="BL Lac")

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

Nearby sources

• B2 2125+35, 9.1° away
• B2 2234+28A, 15.4° away
• B2 2308+34, 15.5° away
• B2 2113+29, 15.9° away

Other BL Lac objects

• TXS 2320+343
• 1ES 1959+650
• RBS 0042
• B3 0045+395
• 87GB 214302.1+095227
• 4C +16.67

How to cite

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