1H 1720+117 multiwavelength SED

Also known as 1FGL J1725.0+1151, 1FLAT J172504.4+115215, 1OUNYU J172504+1152.2, 2FGL J1725.0+1151, 2FHL J1725.1+1154, 2WHSP J172504.3+115214, 3FGL J1725.0+1152, 3HSP J172504.3+115216, 5BZB J1725+1152, BZB J1725+1152, CGRaBS J1725+1152, CRATES J172504+115227, H 1722+119, QSO B1722+119, RGB J1725+118.

• Class: BL Lac
• Redshift: z = 0.180
• Position (ICRS): RA 261.26809°, Dec 11.87096°
• Data: 6,346 points (4 upper limits) from 40 catalogues
• Dated data: 2007–2025 (MJD 54269–60969)
• Undated catalogue values: 331
• Frequency range of detections: log ν = 8.0–26.2 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 402 UVOT and 245 XRT
• Largest catalogues (points): ASAS-SN (3,082), ZTF (2,002), MMDCXRT_ORBIT (262), MMDCXRT (210), SUFST (210)

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=261.26809, dec=11.87096, name="1H 1720+117")

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

Other BL Lac objects

• OT 081
• S3 1741+19
• PG 1553+113
• B2 1811+31
• 4C +14.60
• B3 1659+399

How to cite

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