3C 273 multiwavelength SED

Names and position

Also known as 1FGL J1229.1+0203, 1FLAT J122906.7+020308, 1Jy 1226+023, 3C273.0, 3FGL J1229.1+0202, 5BZQ J1229+0203, BZQ J1229+0203, CRATES J122906+020245, IRAS12265+0219, PKS 1226+023, PKS B1226+023, ROXA J122906.5+020308.4, WMAP170, WMAP5 J0423+0218.

• Class: FSRQ
• Redshift: z = 0.158
• Position (ICRS): RA 187.27792°, Dec 2.05239°
• Galactic: l 289.951°, b 64.360°

Other names and measurements: NED and SIMBAD within 5″ of this position.

The SED

• Data: 29,289 points (186 upper limits) from 56 catalogues
• Dated data: 1993–2025 (MJD 48994–60887)
• Undated catalogue values: 262
• Frequency range of detections: log ν = 7.1–25.4 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 3,004 UVOT and 7,165 XRT
• Largest catalogues (points): MMDCXRT_ORBIT (11,170), MMDCXRT (6,798), MMDCNuX (3,863), MMDCOUV (1,502), ZTF (1,448)

Data by band

All 7 bands have data. The X-ray band has the most points, 22,250 of 29,289; its largest catalogue is MMDCXRT_ORBIT with 11,170.

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=187.27792, dec=2.05239, name="3C 273")

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

Nearby sources

• 4C +03.23, 1.8° away
• 4C +04.42, 2.7° away
• 1ES 1212+078, 6.5° away
• TXS 1213+097, 8.1° away

Other FSRQs

• PKS 1200-051
• 3C 279
• 4C +13.46
• PKS B1310-041
• PKS 1145-071
• TXS 1235-117

How to cite

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