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| PKS 0405-123 | |
|---|---|
| Name | PKS 0405-123 |
| Type | Quasar |
| Epoch | J2000 |
| Ra | 04h08m |
| Dec | -12° in constellation |
| Redshift | 0.574 |
| Magnitude | 15.5 (V) |
| Other names | PKS 0405-12, QSO B0405-123 |
PKS 0405-123 is an extragalactic radio-loud quasar known for its brightness in optical and radio bands and for being a target in studies of active galactic nuclei and intervening absorption. It has been observed across radio, optical, ultraviolet, X-ray, and gamma-ray facilities and is frequently cited in surveys connecting Active galactic nucleus phenomena with large-scale structure. The object serves as a probe for studies involving Intergalactic medium, Circumgalactic medium, and the distribution of metals in the low-redshift Universe.
PKS 0405-123 is cataloged as a flat-spectrum radio source in the Parkes catalogue and was included in follow-up programs by Very Large Array, Very Long Baseline Array, and Hubble Space Telescope observations. It appears in early radio surveys alongside sources such as 3C 273, 3C 279, and Mrk 421 and has been compared in variability studies with objects like BL Lacertae and PKS 2155-304. PKS 0405-123 is relevant to investigations performed by teams associated with Harvard–Smithsonian Center for Astrophysics, Max Planck Institute for Radio Astronomy, and the European Southern Observatory.
The source was identified in the Parkes radio surveys conducted by groups including Gardner and Whiteoak teams and later targeted by optical spectroscopic programs at Cerro Tololo Inter-American Observatory and Anglo-Australian Telescope. Follow-up ultraviolet spectroscopy was executed by instruments aboard Hubble Space Telescope using the Faint Object Spectrograph and the Space Telescope Imaging Spectrograph, in campaigns similar to those that observed Quasar absorption lines toward 3C 273 and PG 1211+143. X-ray detections were obtained by missions such as ROSAT, Chandra X-ray Observatory, and XMM-Newton, while gamma-ray searches referenced data from Fermi Gamma-ray Space Telescope and earlier EGRET analyses. Radio structure studies leveraged Very Long Baseline Interferometry networks including European VLBI Network and research groups at National Radio Astronomy Observatory.
PKS 0405-123 exhibits properties characteristic of luminous quasars cataloged with the Third Cambridge Catalogue of Radio Sources and compared with samples from the Sloan Digital Sky Survey. Its optical magnitude places it among targets observed by Cerro Tololo Inter-American Observatory imaging programs and by spectroscopic surveys under Two Micron All Sky Survey collaborations. The source's radio morphology shows compact core-dominated emission akin to sources studied in the MOJAVE program and has structure on milliarcsecond scales accessible to Very Long Baseline Array imaging. Host galaxy studies draw on methods used for Elliptical galaxy classification and comparisons with well-studied hosts such as M87 and NGC 1275.
Optical and ultraviolet spectroscopy established a systemic redshift through broad emission lines following techniques employed in analyses of Lyman-alpha and Mg II emission in quasar spectra, with redshift determinations using pipelines similar to those developed by Sloan Digital Sky Survey teams. The emission-line spectrum shows high-ionization lines comparable to those in C IV and He II studies, and ultraviolet absorption features have been used to probe intervening systems following methodologies from Quasar absorption line research groups. Spectral energy distribution modeling references approaches applied in works by Blandford and Rees on relativistic jet emission and in composite quasar spectrum compilations by Vanden Berk.
Investigations of the local environment of PKS 0405-123 employ imagery and spectroscopy techniques used in studies of galaxy clustering performed by the Two Degree Field Galaxy Redshift Survey and the Sloan Digital Sky Survey. The quasar's surroundings have been examined for galaxy overdensities and circumgalactic absorbers using approaches from COS-Halos and SDSS-IV programs, drawing parallels to environmental analyses around PKS 2126-158 and PG 0953+414. Observations with the Hubble Space Telescope and ground-based facilities such as Keck Observatory and Very Large Telescope have been used to search for the host galaxy morphology and satellite companions following methods applied to hosts like 3C 48.
PKS 0405-123 shows variability across wavelengths, a trait common to radio-loud quasars monitored by programs like All-Sky Automated Survey for Supernovae and radio monitoring by the RATAN-600 and Owens Valley Radio Observatory teams. Multiwavelength campaigns coordinate facilities including Hubble Space Telescope, Chandra X-ray Observatory, XMM-Newton, and the Fermi Gamma-ray Space Telescope to study correlated variability similar to campaigns targeting 3C 279 and PKS 1510-089. Variability analyses employ time-series techniques developed in studies by groups at Max Planck Institute for Astrophysics and statistical methods used in the AGN Watch program.
PKS 0405-123 serves as a probe for studies of the Intergalactic medium, Circumgalactic medium, and metal enrichment history investigated by teams using Hubble Space Telescope ultraviolet spectroscopy and ground-based echelle spectrographs at Keck Observatory and Very Large Telescope. It is cited in literature addressing feedback from Active galactic nucleus outflows, jet physics in models by Blandford–Znajek process proponents, and the role of quasars in reionization-era analog studies. The source is included in statistical samples compiled by surveys such as Sloan Digital Sky Survey, FIRST, and NVSS that underpin cosmological tests and studies of large-scale structure executed by collaborations at Institute for Advanced Study and Max Planck Institute for Astronomy.
Category:Quasars Category:Radio sources Category:Extragalactic astronomy