OQ 253 multiwavelength SED

Also known as 1FLAT J143439.8+195200, 3FGL J1434.6+1951, 5BZQ J1434+1952, BZQ J1434+1952, CRATES J143440+195215, PKS 1432+200, TXS 1432+200.

• Class: FSRQ
• Redshift: z = 1.382
• Position (ICRS): RA 218.66581°, Dec 19.86687°
• Data: 2,771 points (87 upper limits) from 35 catalogues
• Dated data: 2009–2025 (MJD 55129–60900)
• Undated catalogue values: 69
• 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: 24 UVOT and 7 XRT
• Largest catalogues (points): ZTF (1,605), NEOWISE (684), MMDCGR (192), WISEME (138), PanSTARRS-LC (46)

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=218.66581, dec=19.86687, name="OQ 253")

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

Other FSRQs

• PKS B1434+235
• PKS 1441+25
• TXS 1448+093
• PKS 1502+106
• OQ 334
• B2 1348+30B

How to cite

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