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Environment plays a critical role in the star formation history of galaxies.Tidal and hydrodynamical stripping, prominent in cluster environment, canremove the peripheral gas of galaxies and star formation may thus beenvironmentally suppressed from the outside-in. We revisit the environmentaldependence of the radial gradient of specific star formation rate (sSFR)profile. We probe the radial gradient by using the archival spectral indicesD4000n and HdA measured from SDSS fiber spectra, to indicate central sSFR, andthe total sSFR from fitting the spectral energy distribution. Despite the lowspatial resolution, the wealth of SDSS data allows to disentangle thedependences on stellar mass, sSFR, and environment. We find that low-masssatellite galaxies in the mass range 9 < log M/M_solar < 9.8 on average quenchin more inside-out pattern compared to isolated galaxies matched in mass, sSFR,and fiber coverage. This environmental effect is particularly strong forgalaxies below the star formation main sequence, and peaks for those in thecore of massive clusters where the phase-space diagram reveals clear linksbetween the inside-out quenching and orbital properties. Our results suggestthat both tidal and hydrodynamical interactions in cluster environment suppressthe star formation of satellites mainly from the inside-out. As accreted gas oflow angular momentum from hot gas halos is an important source for replenishingcentral gas reservoir, we discuss how gas stripping in clusters may lead tostarvation and cause inside-out quenching when the outer star-forming discs arenot significantly affected.

Cluster environment quenches the star formation of low-mass satellite galaxies from the inside-out