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Date and Time of the Query: 2019-06-19 T10:07:00 PDT
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For refcode 2010ApJ...717..147S:
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2010ApJ...717..147S A Warm Molecular Hydrogen Tail due to Ram-pressure Stripping of a Cluster Galaxy Sivanandam, Suresh; Rieke, Marcia J.; Rieke, George H. Abstract. We have discovered a remarkable warm (130-160 K) molecular hydrogen tail with a H_2_ mass of approximately 4 x 10^7^ M_sun_ extending 20 kpc from a cluster spiral galaxy, ESO 137-001, in Abell 3627. At least half of this gas is lost permanently to the intracluster medium, as the tail extends beyond the tidal radius of the galaxy. We also detect a hot (400-550 K) component in the tail that is approximately 1% of the mass. The large H_2_ line to IR continuum luminosity ratio in the tail indicates that star formation is not a major excitation source and that the gas is possibly shock-heated. This discovery confirms that the galaxy is currently undergoing ram-pressure stripping, as also indicated by its previously discovered X-ray and H{alpha} tails. We estimate that the galaxy is losing its warm H_2_ gas at a rate of ~2-3 M_sun_ yr^--1^. The true mass-loss rate is likely higher if we account for cold molecular gas and atomic gas. We predict that the galaxy will lose most of its gas in a single pass through the core and place a strong upper limit on the ram-pressure timescale of 1 Gyr. We also study the star-forming properties of the galaxy and its tail. We identify most of the previously discovered external H{alpha} sources within the tail in our 8 micron data but not in our 3.6 micron data; IRS spectroscopy of the region containing these H{alpha} sources also reveals aromatic features typically associated with star formation. From the positions of these H II regions, it appears that star formation is not occurring throughout the molecular hydrogen tail but only immediately downstream of the galaxy. Some of these H II regions lie outside the tidal radius of the galaxy, indicating that ram-pressure stripping can be a source of intracluster stars. Key words: galaxies: clusters: individual: Abell 3627, galaxies: evolution, galaxies: individual: ESO 137-001, galaxies: ISM, infrared: galaxies
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