S4 1738+49 multiwavelength SED

Also known as 1FLAT J173927.4+495503, 2FGL J1739.5+4955, 3FGL J1739.4+4955, 5BZQ J1739+4955, BZQ J1739+4955, CRATES J173928+495502, OT463, S41738+499, TXS 1738+499.

• Class: FSRQ
• Redshift: z = 1.540
• Position (ICRS): RA 264.86413°, Dec 49.91760°
• Data: 4,779 points (30 upper limits) from 33 catalogues
• Dated data: 2009–2025 (MJD 54896–60969)
• Undated catalogue values: 92
• Frequency range of detections: log ν = 7.9–25.2 [Hz] (radio, microwave, infrared, optical, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 36 UVOT
• Largest catalogues (points): ZTF (2,814), NEOWISE (1,444), WISEME (240), MMDCGR (93), PanSTARRS-LC (58)

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=264.86413, dec=49.9176, name="S4 1738+49")

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

Other FSRQs

• 4C +51.37
• S4 1726+45
• S4 1800+44
• B3 1708+433
• 4C +47.44
• TXS 1629+495

How to cite

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