S4 1800+44 multiwavelength SED

Also known as 1Jy 1800+440, 2FGL J1801.7+4405, 3FGL J1801.5+4403, 4FGL J1801.5+4404, 5BZQ J1801+4404, B31800+44, B31800+440, BZQ J1801+4404, CRATES J180132+440409, S41800+440, TXS 1800+440, WMAP5 J1801+4404.

• Class: FSRQ
• Redshift: z = 0.660
• Position (ICRS): RA 270.38465°, Dec 44.07275°
• Data: 16,308 points (6 upper limits) from 37 catalogues
• Dated data: 2006–2025 (MJD 54043–60960)
• Undated catalogue values: 154
• Frequency range of detections: log ν = 7.9–25.2 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 46 UVOT and 44 XRT
• Largest catalogues (points): ZTF (11,466), ASAS-SN (4,024), PanSTARRS-LC (206), WISEME (178), MMDCGR (134)

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=270.38465, dec=44.07275, name="S4 1800+44")

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

Other FSRQs

• S4 1726+45
• S4 1738+49
• 4C +51.37
• B3 1708+433
• S4 1851+48
• B2 1722+33

How to cite

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