3C 279 multiwavelength SED

Names and position

Also known as 1FGL J1256.2-0547, 1FLAT J125611.2-054721, 1Jy 1253-055, 1OUNYU J125611-0547.3, 2FGL J1256.1-0547, 2FHL J1256.2-0548, 3FGL J1256.1-0547, 5BZQ J1256-0547, BZQ J1256-0547, CRATES J125610-054722, PKS 1253-055, PKS B1253-055, TXS 1253-055.

• Class: FSRQ
• Redshift: z = 0.536
• Position (ICRS): RA 194.04653°, Dec −5.78931°
• Galactic: l 305.104°, b 57.062°

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

The SED

• Data: 21,351 points (369 upper limits) from 60 catalogues
• Dated data: 1993–2025 (MJD 48994–60877)
• Undated catalogue values: 278
• Frequency range of detections: log ν = 7.2–26.2 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 3,692 UVOT and 3,998 XRT
• Largest catalogues (points): MMDCXRT_ORBIT (5,226), MMDCXRT (3,524), SMARTS (2,985), MMDCGR (2,032), MMDCOUV (1,846)

Data by band

All 7 bands have data. The X-ray band has the most points, 11,937 of 21,351; its largest catalogue is MMDCXRT_ORBIT with 5,226.

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=194.04653, dec=-5.78931, name="3C 279")

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

See an AstroGenesis answer about 3C 279

Nearby sources

• PKS B1310-041, 4.4° away
• TXS 1307-117, 7.1° away
• TXS 1235-117, 7.6° away
• PKS 1329-049, 9.0° away

Other FSRQs

• 3C 273
• 4C +03.23
• PKS 1335-127
• 4C +04.42
• PKS 1200-051
• PKS 1352-104

How to cite

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