4C +16.67 multiwavelength SED

Also known as 1FLAT J201503.8+162227, 3FGL J2014.9+1623, 3HSP J201503.8+162227, TXS 2012+162.

• Class: BL Lac
• Redshift: z = 0.250
• Position (ICRS): RA 303.76590°, Dec 16.37426°
• Data: 2,688 points (26 upper limits) from 29 catalogues
• Dated data: 2007–2024 (MJD 54443–60609)
• Undated catalogue values: 87
• 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: 4 XRT
• Largest catalogues (points): ZTF (1,756), NEOWISE (664), WISEME (80), PanSTARRS-LC (72), GLEAMV2 (19)

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=303.7659, dec=16.37426, name="4C +16.67")

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

Other BL Lac objects

• 87GB 214302.1+095227
• MS 2143.4+0704
• B2 2125+35
• PKS 2131-021
• B2 1811+31
• TXS 2056-149

How to cite

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