Obscured Narrow-Line Seyfert 1 Galaxy Candidate Mrk 1388 with Nonthermal Jets
Akihiro Doi

TL;DR
This study identifies Mrk 1388 as an obscured NLS1 galaxy with nonthermal jets, using VLBI and HST data to estimate a black hole mass consistent with typical NLS1s, despite its peculiar spectral features.
Contribution
The paper provides multi-wavelength observations revealing nonthermal jets and estimates black hole mass in Mrk 1388, clarifying its nature as an obscured NLS1 galaxy.
Findings
Detection of high-brightness nonthermal jets via VLBI.
Black hole mass estimates around 1-5 million solar masses.
Obscuration explains peculiar spectral features.
Abstract
Mrk 1388 has an unusual Seyfert nucleus that shows narrow emission-line components without broad ones, but shows a strong featureless continuum and strong iron-forbidden high-ionization emission lines. The apparent coexistence of type-1/2 characteristics is potentially attributed to a heavily obscured broad-line region or to an intermediate-mass black hole with a broad-line component intrinsically narrower than those of typical narrow-line Seyfert 1 (NLS1) galaxies. Our observation using very-long-baseline interferometry (VLBI) reveals high-brightness radio emission from nonthermal jets from an active galactic nucleus (AGN) with a significant radio luminosity. Furthermore, we investigate the radial profile of the host galaxy using a Hubble Space Telescope (HST) image, which shows a Sersic index suggestive of a pseudobulge. Using the VLBI and HST results, which are essentially not…
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