I Zw 187 multiwavelength SED

Also known as 1ES 1727+502, 1FGL J1727.9+5010, 1FLAT J172818.6+501310, 1OUNYU J172819+5013.1, 1ZW187, 2FGL J1728.2+5015, 2FHL J1728.2+5013, 2WHSP J172818.5+501309, 3FGL J1728.3+5013, 3HSP J172818.6+501311, 5BZB J1728+5013, BZB J1728+5013, CRATES J172818+501315, PGC60348.

• Class: BL Lac
• Redshift: z = 0.0554
• Position (ICRS): RA 262.07760°, Dec 50.21957°
• Data: 9,882 points (4 upper limits) from 38 catalogues
• Dated data: 2010–2025 (MJD 55256–60766)
• Undated catalogue values: 385
• Frequency range of detections: log ν = 8.2–26.4 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 1,880 UVOT and 2,337 XRT
• Largest catalogues (points): MMDCXRT (5,160), NEOWISE (1,498), MMDCOUV (1,470), ASAS-SN (850), SUFST (245)

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=262.0776, dec=50.21957, name="I Zw 187")

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

Other BL Lac objects

• 4C +56.27
• B3 1659+399
• Mrk 501
• RBS 1555
• B3 1615+412
• 1ES 1533+535

How to cite

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