PG 1218+304 multiwavelength SED

Also known as 1FGL J1221.3+3008, 1FLAT J122121.9+301037, 1H 1219+301, 1OUNYU J122122+3010.6, 2FGL J1221.3+3010, 2FHL J1221.3+3009, 2WHSP J122121.9+301036, 3FGL J1221.3+3010, 3HSP J122122.0+301037, 5BZB J1221+3010, BZB J1221+3010, EXO1218.8+3027, QSO B1218+304, SDSS J122121.94+301037.2, SHBL J122121.9+301037.

• Class: BL Lac
• Redshift: z = 0.184
• Position (ICRS): RA 185.34143°, Dec 30.17699°
• Data: 3,094 points (14 upper limits) from 46 catalogues
• Dated data: 1999–2025 (MJD 51371–60967)
• Undated catalogue values: 130
• Frequency range of detections: log ν = 8.2–26.4 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Largest catalogues (points): ZTF (1,862), NEOWISE (625), OUSXB (150), MMDCGR (94), WISEME (80)

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=185.34143, dec=30.17699, name="PG 1218+304")

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

Other BL Lac objects

• B2 1215+30
• W Comae
• B2 1229+29
• ON 246
• MS 1221.8+2452
• TXS 1221+229

How to cite

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