%0 Generic %1 sivanandam2014tracing %A Sivanandam, Suresh %A Rieke, Marcia J. %A Rieke, George H. %D 2014 %K molecular pressure ram shocks stripping warm %T Tracing Ram-Pressure Stripping with Warm Molecular Hydrogen Emission %U http://arxiv.org/abs/1410.0688 %X We use the Spitzer Infrared Spectrograph (IRS) to study four infalling cluster galaxies with signatures of on-going ram-pressure stripping. H$_2$ emission is detected in all four; two show extraplanar H$_2$ emission. The emission usually has a warm (T $\sim$ $115 - 160$K) and a hot (T $\sim$ 400 $-$ 600K) component that is approximately two orders of magnitude less massive than the warm one. The warm component column densities are typically $10^19 - 10^20$ cm$^-2$ with masses of $10^6 - 10^8 M_ødot$. The warm H$_2$ is anomalously bright compared with normal star-forming galaxies and therefore may be excited by ram-pressure. In the case of CGCG 97-073, the H$_2$ is offset from the majority of star formation along the direction of the galaxy's motion in the cluster, suggesting it is forming in the ram-pressure wake of the galaxy. Another galaxy, NGC 4522, exhibits a warm H$_2$ tail approximately 4 kpc in length. These results support the hypothesis that H$_2$ within these galaxies is shock-heated from the interaction with the intracluster medium. Stripping of dust is also a common feature of the galaxies. For NGC 4522, where the distribution of dust at 8 $\mu$m is well resolved, knots and ripples demonstrate the turbulent nature of the stripping process. The H$\alpha$ and 24 $\mu$m luminosities show that most of the galaxies have star formation rates comparable to similar mass counterparts in the field. Finally, we suggest a possible evolutionary sequence primarily related to the strength of ram-pressure a galaxy experiences to explain the varied results observed in our sample.

@misc{sivanandam2014tracing, abstract = {We use the Spitzer Infrared Spectrograph (IRS) to study four infalling cluster galaxies with signatures of on-going ram-pressure stripping. H$_2$ emission is detected in all four; two show extraplanar H$_2$ emission. The emission usually has a warm (T $\sim$ $115 - 160$K) and a hot (T $\sim$ 400 $-$ 600K) component that is approximately two orders of magnitude less massive than the warm one. The warm component column densities are typically $10^{19} - 10^{20}$ cm$^{-2}$ with masses of $10^6 - 10^8 M_\odot$. The warm H$_2$ is anomalously bright compared with normal star-forming galaxies and therefore may be excited by ram-pressure. In the case of CGCG 97-073, the H$_2$ is offset from the majority of star formation along the direction of the galaxy's motion in the cluster, suggesting it is forming in the ram-pressure wake of the galaxy. Another galaxy, NGC 4522, exhibits a warm H$_2$ tail approximately 4 kpc in length. These results support the hypothesis that H$_2$ within these galaxies is shock-heated from the interaction with the intracluster medium. Stripping of dust is also a common feature of the galaxies. For NGC 4522, where the distribution of dust at 8 $\mu$m is well resolved, knots and ripples demonstrate the turbulent nature of the stripping process. The H$\alpha$ and 24 $\mu$m luminosities show that most of the galaxies have star formation rates comparable to similar mass counterparts in the field. Finally, we suggest a possible evolutionary sequence primarily related to the strength of ram-pressure a galaxy experiences to explain the varied results observed in our sample.}, added-at = {2014-10-06T09:40:15.000+0200}, author = {Sivanandam, Suresh and Rieke, Marcia J. and Rieke, George H.}, biburl = {https://www.bibsonomy.org/bibtex/22e2a61ddc2f9e0a952ad056f581c274b/miki}, description = {[1410.0688] Tracing Ram-Pressure Stripping with Warm Molecular Hydrogen Emission}, interhash = {65e14af278fdfc93b3c3914d4236b390}, intrahash = {2e2a61ddc2f9e0a952ad056f581c274b}, keywords = {molecular pressure ram shocks stripping warm}, note = {cite arxiv:1410.0688Comment: 26 pages, 22 figures, accepted for publication in ApJ}, timestamp = {2014-10-06T09:40:15.000+0200}, title = {Tracing Ram-Pressure Stripping with Warm Molecular Hydrogen Emission}, url = {http://arxiv.org/abs/1410.0688}, year = 2014 }