Galaxies can be "pre-processed" in the low-density outskirts by ambient medium in the filaments or tidal interactions with other galaxies while falling into the cluster. In order to probe how early on and by which mechanisms galaxies can be affected before they enter high-density cluster environments, we are carry- ing out an atomic hydrogen (H i) imaging study of a sample of galaxies selected from three filamentary structures around the Virgo cluster. Our sample consists of 14 late-type galaxies, which are potentially interacting with their surroundings. The Hi observations have been done using the Westerbork Synthesis Radio Telescope, the Giant Metrewave Radio Telescope, and the Jansky Very Large Array with column density sensitivity of ≈ 3-5 X 1019 cm-2 in 3σ per channel, which is low enough to detect faint Hi features in the outer disks of galaxies. In this work, we present the Hi data of two galaxies that were observed with GMRT. We examine the Hi morphology and kinematics to find the evidence for gas-gas and/or tidal interactions, and discuss which mechanism(s) could be responsible for pre-processing in these cases.

ABSTRACT
1. INTRODUCTION
2. SAMPLE AND Hi OBSERVATIONS
3. RESULTS
REFERENCES

• Hyein Yoon(Department of Astronomy, Yonsei University)
• Aeree Chung(Department of Astronomy, Yonsei University)
• Chandreyee Sengupta(Korea Astronomy and Space Science Institute)
• O. Ivy Wong(International Centre for Radio Astronomy Research)
• Martin Bureau(Sub-Department of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road)
• Soo-Chang Rey(Department of Astronomy and Space Science, Chungnam National University)
• J. H. van Gorkom(Department of Astronomy, Columbia University)