%0 Generic %1 smith2017extended %A Smith, Russell J. %A Edge, Alastair C. %D 2017 %K absorption cluster extended filament %T An extended cold gas absorber in a central cluster galaxy %U http://arxiv.org/abs/1706.08533 %X We present the serendipitous discovery of an extended cold gas structure projected close to the brightest cluster galaxy (BCG) of the z=0.045 cluster Abell 3716, from archival integral field spectroscopy. The gas is revealed through narrow Na D line absorption, seen against the stellar light of the BCG, which can be traced for $\sim$25 kpc, with a width of 2-4 kpc. The gas is offset to higher velocity than the BCG (by $\sim$100 km/s), showing that it is infalling rather than outflowing; the intrinsic linewidth is $\sim$80 km/s (FWHM). Very weak H$\alpha$ line emission is detected from the structure, and a weak dust absorption feature is suggested from optical imaging, but no stellar counterpart has been identified. We discuss some possible interpretations for the absorber: as a projected low-surface-brightness galaxy, as a stream of gas that was stripped from an infalling cluster galaxy, or as a "retired" cool-core nebula filament.

@misc{smith2017extended, abstract = {We present the serendipitous discovery of an extended cold gas structure projected close to the brightest cluster galaxy (BCG) of the z=0.045 cluster Abell 3716, from archival integral field spectroscopy. The gas is revealed through narrow Na D line absorption, seen against the stellar light of the BCG, which can be traced for $\sim$25 kpc, with a width of 2-4 kpc. The gas is offset to higher velocity than the BCG (by $\sim$100 km/s), showing that it is infalling rather than outflowing; the intrinsic linewidth is $\sim$80 km/s (FWHM). Very weak H$\alpha$ line emission is detected from the structure, and a weak dust absorption feature is suggested from optical imaging, but no stellar counterpart has been identified. We discuss some possible interpretations for the absorber: as a projected low-surface-brightness galaxy, as a stream of gas that was stripped from an infalling cluster galaxy, or as a "retired" cool-core nebula filament.}, added-at = {2017-06-28T06:56:33.000+0200}, author = {Smith, Russell J. and Edge, Alastair C.}, biburl = {https://www.bibsonomy.org/bibtex/26ba15fb38a633999d7f698617bc6945a/miki}, description = {[1706.08533] An extended cold gas absorber in a central cluster galaxy}, interhash = {5725e0fdb8f1519f857b223d28c71d95}, intrahash = {6ba15fb38a633999d7f698617bc6945a}, keywords = {absorption cluster extended filament}, note = {cite arxiv:1706.08533Comment: MNRAS Letters, accepted}, timestamp = {2017-06-28T06:56:33.000+0200}, title = {An extended cold gas absorber in a central cluster galaxy}, url = {http://arxiv.org/abs/1706.08533}, year = 2017 }