PKS 0447-439 multiwavelength SED

PKS 0447-439 is a BL Lac object at redshift z = 0.190. Its MMDC SED has 5,914 points from 39 catalogues, with dated data from 2008–⁠2025. Download the SED as CSV.

Updated 29 October 2026.

Names and position

Also known as 1OUNYU J044925-4350.1, 2WHSP J044924.6-435008, 3FGL J0449.4-4350, 3HSP J044924.7-435009, 4FGL J0449.4-4350, 5BZB J0449-4350, BZB J0449-4350.

Class: BL Lac
Redshift: z = 0.190
Fermi-LAT (4FGL): 4FGL J0449.4-4350
Position (ICRS): RA 72.35291°, Dec −43.83582°
Galactic: l 248.805°, b −39.919°

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

The SED

Data: 5,914 points (6 upper limits) from 39 catalogues
Dated data: 2008–2025 (MJD 54694–60886)
Undated catalogue values: 203
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: 294 UVOT and 279 XRT
Largest catalogues (points): ASAS-SN (4,184), MMDCXRT_ORBIT (530), MMDCGR (364), MMDCXRT (251), WISEME (154)

Data by band

All 7 bands have data. The optical band has the most points, 4,382 of 5,914; its largest catalogue is ASAS-SN with 4,184.

Band	Points	Catalogues	Dated data
radio	31	6	undated
microwave	24	6	2014–2015
infrared	172	7	2010
optical	4,382	3	2008–2024
ultraviolet	2	1	undated
X-ray	901	10	2008–2017
γ-ray	402	6	2008–2025

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=72.35291, dec=-43.83582, name="PKS 0447-439")

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

Nearby sources

PKS 0454-46, 2.7° away
PKS 0514-459, 5.1° away
PKS 0524-460, 6.7° away
PKS 0426-380, 7.1° away

Other BL Lac objects

How to cite

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