4C +38.41 multiwavelength SED

Names and position

Also known as 1FGL J1635.0+3808, 1Jy 1633+382, 1OUNYU J163516+3808.0, 2FGL J1635.2+3810, 3FGL J1635.2+3809, 4C38.41, 5BZQ J1635+3808, B21633+38, BZQ J1635+3808, CRATES J163515+380813, Q1633+382, QSO B1633+382, S41633+382, TXS 1633+382, WMAP33, WMAP5 J1635+3807.

• Class: FSRQ
• Redshift: z = 1.814
• Position (ICRS): RA 248.81455°, Dec 38.13458°
• Galactic: l 61.086°, b 42.336°

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

The SED

• Data: 7,337 points (134 upper limits) from 44 catalogues
• Dated data: 2007–2024 (MJD 54139–60460)
• Undated catalogue values: 285
• Frequency range of detections: log ν = 7.9–26.2 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 1,440 UVOT
• Largest catalogues (points): MMDCXRT (1,350), XRTSPEC (1,331), ASAS-SN (1,288), MMDCOUV (1,004), OULC (764)

Data by band

All 7 bands have data. The X-ray band has the most points, 3,849 of 7,337; its largest catalogue is MMDCXRT with 1,350.

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=248.81455, dec=38.13458, name="4C +38.41")

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

Nearby sources

• 3C 345, 2.2° away
• Mrk 501, 4.0° away
• B3 1615+412, 4.6° away
• B3 1659+399, 5.4° away

Other FSRQs

• B2 1606+40
• OS 319
• B3 1708+433
• 4C +47.44
• B2 1722+33
• 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).