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Journal Article

DIISC-I: The discovery of kinematically anomalous H I clouds in M 100


Kauffmann,  Guinevere
Cosmology, MPI for Astrophysics, Max Planck Society;

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Gim, H. B., Borthakur, S., Momjian, E., Padave, M., Jansen, R. A., Nelson, D., et al. (2021). DIISC-I: The discovery of kinematically anomalous H I clouds in M 100. The Astrophysical Journal, 922(1): 69. doi:10.3847/1538-4357/ac2303.

Cite as: https://hdl.handle.net/21.11116/0000-0009-C1FD-0
We report the discovery of two kinematically anomalous atomic hydrogen (H I) clouds in M 100 (NGC 4321), which was observed as part of the Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium (DIISC) survey in H I 21 cm at 3.3 km s−1 spectroscopic and 44'' × 30'' spatial resolution using the Karl G. Jansky Very Large Array. 15 These clouds were identified as structures that show significant kinematic offsets from the rotating disk of M 100. The velocity offsets of 40 km s −1 observed in these clouds are comparable to the offsets seen in intermediate-velocity clouds (IVCs) in the circumgalactic medium (CGM) of the Milky Way and nearby galaxies. We find that one anomalous cloud in M 100 is associated with star-forming regions detected in Hα and far-ultraviolet imaging. Our investigation shows that anomalous clouds in M 100 may originate from multiple mechanisms, such as star formation feedback-driven outflows, ram pressure stripping, and tidal interactions with satellite galaxies. Moreover, we do not detect any cool CGM at 38.8 kpc from the center of M 100, giving an upper limit of N(H I) ≤1.7 × 10 13 cm −2 (3σ). Since M 100 is in the Virgo cluster, the nonexistence of neutral/cool CGM is a likely pathway for turning it into a red galaxy.