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Mrk 1388 has an unusual Seyfert nucleus that shows narrow emission-linecomponents without broad ones, but shows a strong featureless continuum andstrong iron-forbidden high-ionization emission lines. The apparent coexistenceof type-1/2 characteristics is potentially attributed to a heavily obscuredbroad-line region or to an intermediate-mass black hole with a broad-linecomponent 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 activegalactic nucleus (AGN) with a significant radio luminosity. Furthermore, weinvestigate the radial profile of the host galaxy using a Hubble SpaceTelescope (HST) image, which shows a Sersic index suggestive of a pseudobulge.Using the VLBI and HST results, which are essentially not affected by dustextinction, three individual methods provide similar estimates for the blackhole mass: (0.76--5.4)x10^6 M_sun, 1.5x10^6 M_sun, and 4.1x10^6 M_sun. Thesemasses are in a range that is preferential for typical NLS1 galaxies ratherthan for intermediate-mass black holes. Based on the estimated masses, the fullwidth at half maximum $FWHM(H_\beta)$ of approximately 1200--1700 km/s shouldhave been seen. The scenario of a heavily absorbed NLS1 nucleus can explain thepeculiarities previously observed.

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