B2 1811+31 multiwavelength SED

Also known as 1FGL J1813.4+3141, 1FLAT J181335.2+314417, 1OUNYU J181335+3144.2, 2FGL J1813.5+3143, 3FGL J1813.6+3143, 3HSP J181335.2+314418, 4FGL J1813.5+3144, 5BZB J1813+3144, BZB J1813+3144, CRATES J181335+314422.

• Class: BL Lac
• Redshift: z = 0.117
• Position (ICRS): RA 273.39668°, Dec 31.73823°
• Data: 5,203 points (27 upper limits) from 39 catalogues
• Dated data: 2004–2025 (MJD 53353–60948)
• Undated catalogue values: 95
• 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: 106 UVOT and 293 XRT
• Largest catalogues (points): ZTF (2,928), NEOWISE (912), MMDCXRT_ORBIT (326), SUFST (238), MMDCXRT (225)

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=273.39668, dec=31.73823, name="B2 1811+31")

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

Other BL Lac objects

• S3 1741+19
• B3 1659+399
• Mrk 501
• I Zw 187
• OT 081
• 1H 1720+117

How to cite

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