%0 Generic %1 neelamkodan2014molecular %A Neelamkodan, Naslim %A Kemper, Francisca %A Madden, Suzanne %A Hony, Sacha %A Chu, You-Hua %A Galliano, Frederic %A Bot, Caroline %A Yang, Yao-Lun %A Seok, Ji Yeon %A Oliveira, Joana M. %A van Loon, Jacco Th. %A Meixner, Margaret %A Li, Aigen %A Hughes, Annie %A Gordon, Karl D. %A Otsuka, Masaaki %A Hirashita, Hiroyuki %A Morata, Oscar %A Lebouteiller, Vianney %A Indebetouw, Remy %A Srinivasan, Sundar %A Bernard, Jean-philippe %A Reach, William T. %D 2014 %K gas lmc molecular warm %T Molecular hydrogen emission in the interstellar medium of the Large Magellanic Cloud %U http://arxiv.org/abs/1407.7658 %X We present the detection and analysis of molecular hydrogen emission toward ten interstellar regions in the Large Magellanic Cloud. We examined low-resolution infrared spectral maps of twelve regions obtained with the Spitzer infrared spectrograph (IRS). The low-J rotational transitional lines of H2 at 28.2 and 17.1mu are detected in the IRS spectra for ten regions. The higher level transitions are mostly upper limit measurements except for three regions, where a 3sigma detection threshold is achieved for lines at 12.2 and 8.6mu. The excitation diagrams of the detected H2 transitions are used to determine the warm H2 gas column density and temperature. The single-temperature fits through the lower transition lines give temperatures in the range 80-130K. The bulk of the excited H2 gas is found at these temperatures and contributes a significant fraction of ~7-16% to the total gas mass. A tight correlation of the H2 surface brightness with PAH and total infrared emission has been found, which is a clear indication of photo-electric heating in photodissociation regions. We find the excitation of H2 by this process is equally efficient in both atomic and molecular dominated regions. We also present the correlation of the warm H2 physical conditions with the dust parameters. The warm H2 mass fraction and excitation temperature show positive correlations with the average starlight intensity, strongly supporting the excitation process in photodissociation regions.

@misc{neelamkodan2014molecular, abstract = {We present the detection and analysis of molecular hydrogen emission toward ten interstellar regions in the Large Magellanic Cloud. We examined low-resolution infrared spectral maps of twelve regions obtained with the Spitzer infrared spectrograph (IRS). The low-J rotational transitional lines of H2 at 28.2 and 17.1mu are detected in the IRS spectra for ten regions. The higher level transitions are mostly upper limit measurements except for three regions, where a 3sigma detection threshold is achieved for lines at 12.2 and 8.6mu. The excitation diagrams of the detected H2 transitions are used to determine the warm H2 gas column density and temperature. The single-temperature fits through the lower transition lines give temperatures in the range 80-130K. The bulk of the excited H2 gas is found at these temperatures and contributes a significant fraction of ~7-16% to the total gas mass. A tight correlation of the H2 surface brightness with PAH and total infrared emission has been found, which is a clear indication of photo-electric heating in photodissociation regions. We find the excitation of H2 by this process is equally efficient in both atomic and molecular dominated regions. We also present the correlation of the warm H2 physical conditions with the dust parameters. The warm H2 mass fraction and excitation temperature show positive correlations with the average starlight intensity, strongly supporting the excitation process in photodissociation regions.}, added-at = {2014-07-30T09:37:44.000+0200}, author = {Neelamkodan, Naslim and Kemper, Francisca and Madden, Suzanne and Hony, Sacha and Chu, You-Hua and Galliano, Frederic and Bot, Caroline and Yang, Yao-Lun and Seok, Ji Yeon and Oliveira, Joana M. and van Loon, Jacco Th. and Meixner, Margaret and Li, Aigen and Hughes, Annie and Gordon, Karl D. and Otsuka, Masaaki and Hirashita, Hiroyuki and Morata, Oscar and Lebouteiller, Vianney and Indebetouw, Remy and Srinivasan, Sundar and Bernard, Jean-philippe and Reach, William T.}, biburl = {https://www.bibsonomy.org/bibtex/2cf15d983d00be9a5726c571ddf4abec7/miki}, description = {[1407.7658] Molecular hydrogen emission in the interstellar medium of the Large Magellanic Cloud}, interhash = {1cb8fc51089439d19ed3015c524c59f6}, intrahash = {cf15d983d00be9a5726c571ddf4abec7}, keywords = {gas lmc molecular warm}, note = {cite arxiv:1407.7658Comment: Submitted to MNRAS}, timestamp = {2014-07-30T09:37:44.000+0200}, title = {Molecular hydrogen emission in the interstellar medium of the Large Magellanic Cloud}, url = {http://arxiv.org/abs/1407.7658}, year = 2014 }