%0 Generic %1 bouche2016possible %A Bouché, N. %A Finley, H. %A Schroetter, I. %A Murphy, M. T. %A Richter, P. %A Bacon, R. %A Contini, T. %A Richard, J. %A Wendt, M. %A Kammann, S. %A Epinat, B. %A Cantalupo, S. %A Straka, L. A. %A Schaye, J. %A Martin, C. L. %A Péroux, C. %A Wisotzki, L. %A Soto, K. %A Lilly, S. %A Carollo, M. %A Brinchman, J. %A Kollatschny, W. %D 2016 %K cold flow muse rotation signature %T Possible Signatures of a Cold-Flow Disk from MUSE using a z=1 galaxy--quasar pair towards SDSSJ1422-0001 %U http://arxiv.org/abs/1601.07567 %X We use a background quasar to detect the presence of circum-galactic gas around a $z=0.91$ low-mass star forming galaxy. Data from the new Multi Unit Spectroscopic Explorer (MUSE) on the VLT show that the host galaxy has a dust-corrected star-formation rate (SFR) of 4.7$\pm$0.2 Msun/yr, with no companion down to 0.22 Msun/yr (5 $\sigma$) within 240 kpc (30"). Using a high-resolution spectrum (UVES) of the background quasar, which is fortuitously aligned with the galaxy major axis (with an azimuth angle $\alpha$ of only $15^\circ$), we find, in the gas kinematics traced by low-ionization lines, distinct signatures consistent with those expected for a "cold flow disk" extending at least 12 kpc ($3R_1/2$). We estimate the mass accretion rate $M_in$ to be at least two to three times larger than the SFR, using the geometric constraints from the IFU data and the HI column density of $N_HI 20.4$ obtained from a HST/COS NUV spectrum. From a detailed analysis of the low-ionization lines (e.g. ZnII, CrII, TiII, MnII, SiII), the accreting material appears to be enriched to about 0.4 $Z_ødot$ (albeit with large uncertainties: $Z/Z_ødot=-0.4~\pm~0.4$), which is comparable to the galaxy metallicity ($12+O/H=8.7\pm0.2$), implying a large recycling fraction from past outflows. Blue-shifted MgII and FeII absorption in the galaxy spectrum from the MUSE data reveals the presence of an outflow. The MgII and FeII doublet ratios indicate emission infilling due to scattering processes, but the MUSE data do not show any signs of fluorescent FeII* emission.

@misc{bouche2016possible, abstract = {We use a background quasar to detect the presence of circum-galactic gas around a $z=0.91$ low-mass star forming galaxy. Data from the new Multi Unit Spectroscopic Explorer (MUSE) on the VLT show that the host galaxy has a dust-corrected star-formation rate (SFR) of 4.7$\pm$0.2 Msun/yr, with no companion down to 0.22 Msun/yr (5 $\sigma$) within 240 kpc (30"). Using a high-resolution spectrum (UVES) of the background quasar, which is fortuitously aligned with the galaxy major axis (with an azimuth angle $\alpha$ of only $15^\circ$), we find, in the gas kinematics traced by low-ionization lines, distinct signatures consistent with those expected for a "cold flow disk" extending at least 12 kpc ($3\times R_{1/2}$). We estimate the mass accretion rate $\dot M_{\rm in}$ to be at least two to three times larger than the SFR, using the geometric constraints from the IFU data and the HI column density of $\log N_{\rm HI} \simeq 20.4$ obtained from a {\it HST}/COS NUV spectrum. From a detailed analysis of the low-ionization lines (e.g. ZnII, CrII, TiII, MnII, SiII), the accreting material appears to be enriched to about 0.4 $Z_\odot$ (albeit with large uncertainties: $\log Z/Z_\odot=-0.4~\pm~0.4$), which is comparable to the galaxy metallicity ($12+\log \rm O/H=8.7\pm0.2$), implying a large recycling fraction from past outflows. Blue-shifted MgII and FeII absorption in the galaxy spectrum from the MUSE data reveals the presence of an outflow. The MgII and FeII doublet ratios indicate emission infilling due to scattering processes, but the MUSE data do not show any signs of fluorescent FeII* emission.}, added-at = {2016-01-29T09:57:16.000+0100}, author = {Bouché, N. and Finley, H. and Schroetter, I. and Murphy, M. T. and Richter, P. and Bacon, R. and Contini, T. and Richard, J. and Wendt, M. and Kammann, S. and Epinat, B. and Cantalupo, S. and Straka, L. A. and Schaye, J. and Martin, C. L. and Péroux, C. and Wisotzki, L. and Soto, K. and Lilly, S. and Carollo, M. and Brinchman, J. and Kollatschny, W.}, biburl = {https://www.bibsonomy.org/bibtex/29f1ad90aa2110995fe455ee663659149/miki}, description = {[1601.07567] Possible Signatures of a Cold-Flow Disk from MUSE using a z=1 galaxy--quasar pair towards SDSSJ1422-0001}, interhash = {05b171086311bcb6d7c7fe8216d10997}, intrahash = {9f1ad90aa2110995fe455ee663659149}, keywords = {cold flow muse rotation signature}, note = {cite arxiv:1601.07567Comment: 17 pages, 11 figures, accepted for publication in ApJ}, timestamp = {2016-01-29T09:57:16.000+0100}, title = {Possible Signatures of a Cold-Flow Disk from MUSE using a z=1 galaxy--quasar pair towards SDSSJ1422-0001}, url = {http://arxiv.org/abs/1601.07567}, year = 2016 }