%0 Generic %1 muzahid2015extreme %A Muzahid, Sowgat %A Kacprzak, Glenn G. %A Churchil, Christopher W. %A Charlton, Jane C. %A Nielsen, Nikole M. %A Mathes, Nigel L. %A Trujillo-Gomez, Sebastian %D 2015 %K absorption formation metallicity outflows stars %T An Extreme Metallicity, Large-Scale Outflow from a Star-Forming Galaxy at z ~ 0.4 %U http://arxiv.org/abs/1506.01028 %X We present a detailed analysis of a large-scale galactic outflow in the CGM of a massive (M_h ~ 10^12.5 Msun), star-forming (6.9 Msun/yr), sub-L* (0.5 L_B*) galaxy at z=0.39853 that exhibits a wealth of metal-line absorption in the spectra of the background quasar Q 0122-003 at an impact parameter of 163 kpc. The galaxy inclination angle (i=63 degree) and the azimuthal angle (Phi=73 degree) imply that the QSO sightline is passing through the projected minor-axis of the galaxy. The absorption system shows a multiphase, multicomponent structure with ultra-strong, wide velocity spread OVI (logN = 15.16\pm0.04, V_90 = 419 km/s) and NV (logN = 14.69\pm0.07, V_90 = 285 km/s) lines that are extremely rare in the literature. The highly ionized absorption components are well explained as arising in a low density (10^-4.2 cm^-3), diffuse (10 kpc), cool (10^4 K) photoionized gas with a super-solar metallicity (X/H > 0.3). From the observed narrowness of the Lyb profile, the non-detection of SIV absorption, and the presence of strong CIV absorption we rule out equilibrium/non-equilibrium collisional ionization models. The low-ionization photoionized gas with a density of 10^-2.5 cm^-3 and a metallicity of X/H > -1.4 is possibly tracing recycled halo gas. We estimate an outflow mass of ~2x10^10 Msun, a mass-flow rate of ~54 Msun/yr, a kinetic luminosity of ~9x10^41 erg/s, and a mass loading factor of ~8 for the outflowing high-ionization gas. These are consistent with the properties of "down-the-barrel" outflows from infrared-luminous starbursts as studied by Rupke et al. Such powerful, large-scale, metal-rich outflows are the primary means of sufficient mechanical and chemical feedback as invoked in theoretical models of galaxy formation and evolution.

@misc{muzahid2015extreme, abstract = {We present a detailed analysis of a large-scale galactic outflow in the CGM of a massive (M_h ~ 10^12.5 Msun), star-forming (6.9 Msun/yr), sub-L* (0.5 L_B*) galaxy at z=0.39853 that exhibits a wealth of metal-line absorption in the spectra of the background quasar Q 0122-003 at an impact parameter of 163 kpc. The galaxy inclination angle (i=63 degree) and the azimuthal angle (Phi=73 degree) imply that the QSO sightline is passing through the projected minor-axis of the galaxy. The absorption system shows a multiphase, multicomponent structure with ultra-strong, wide velocity spread OVI (logN = 15.16\pm0.04, V_{90} = 419 km/s) and NV (logN = 14.69\pm0.07, V_{90} = 285 km/s) lines that are extremely rare in the literature. The highly ionized absorption components are well explained as arising in a low density (10^{-4.2} cm^{-3}), diffuse (10 kpc), cool (10^4 K) photoionized gas with a super-solar metallicity ([X/H] > 0.3). From the observed narrowness of the Lyb profile, the non-detection of SIV absorption, and the presence of strong CIV absorption we rule out equilibrium/non-equilibrium collisional ionization models. The low-ionization photoionized gas with a density of 10^{-2.5} cm^{-3} and a metallicity of [X/H] > -1.4 is possibly tracing recycled halo gas. We estimate an outflow mass of ~2x10^{10} Msun, a mass-flow rate of ~54 Msun/yr, a kinetic luminosity of ~9x10^{41} erg/s, and a mass loading factor of ~8 for the outflowing high-ionization gas. These are consistent with the properties of "down-the-barrel" outflows from infrared-luminous starbursts as studied by Rupke et al. Such powerful, large-scale, metal-rich outflows are the primary means of sufficient mechanical and chemical feedback as invoked in theoretical models of galaxy formation and evolution.}, added-at = {2015-06-04T10:18:49.000+0200}, author = {Muzahid, Sowgat and Kacprzak, Glenn G. and Churchil, Christopher W. and Charlton, Jane C. and Nielsen, Nikole M. and Mathes, Nigel L. and Trujillo-Gomez, Sebastian}, biburl = {https://www.bibsonomy.org/bibtex/23e4ead0dc11e70dd6b12a11c398b318e/miki}, description = {[1506.01028] An Extreme Metallicity, Large-Scale Outflow from a Star-Forming Galaxy at z ~ 0.4}, interhash = {2ffefb8d02826b5a0d64b5fc784d1e64}, intrahash = {3e4ead0dc11e70dd6b12a11c398b318e}, keywords = {absorption formation metallicity outflows stars}, note = {cite arxiv:1506.01028Comment: Submitted to the APJ (15 pages)}, timestamp = {2015-06-04T10:18:49.000+0200}, title = {An Extreme Metallicity, Large-Scale Outflow from a Star-Forming Galaxy at z ~ 0.4}, url = {http://arxiv.org/abs/1506.01028}, year = 2015 }