The Lockman-SpReSO project. Galactic flows in a sample of far-infrared galaxies

Abstract

Methods. We performed measurements of the \MgII, \MgI, \FeIIa, \FeIIb, and \FeIIc\ spectral lines present in the spectra of the selected sample to determine the EW and velocity of the flows observed in the star-forming galaxies. Subsequently, we conducted $10^7$ bootstrap simulations using Spearman's rank correlation coefficient (${\rho }_s$) to explore correlations with galaxy properties. Furthermore, we calculated the covering factor, gas density, and optical depth for the measured \ion{Fe}{II} doublets. Results. Our analysis revealed strong correlations between the EW of \ion{Mg}{II} lines and both $M_{\ast }$ (${\rho }_s=0.43$, 4.5$\sigma$) and SFR (${\rho }_s=0.42$, 4.4$\sigma$). For the \ion{Fe}{II} lines, we observed strong correlations between the EW and SFR (${\rho }_s\sim 0.65$, $>3.9\sigma$), with a weaker correlation for $M_{\ast }$ (${\rho }_s\sim 0.35$, $>1.9\sigma$). No notable correlations were found between velocity measurements of \ion{Mg}{II} line and $M_{\ast }$, SFR, or sSFR of the objects (${\rho }_s\sim 0.1)$. However, a negative strong correlation was found between the velocity of the \ion{Fe}{II} lines and the SFR of the galaxies (${\rho }_s\sim -0.45$, $\sim 3\sigma$). Our results align with previous studies but studying FIR-selected objects. Finally, we detected a candidate \textit{loitering outflow}, a recently discovered subtype of FeLoBAL quasar, at redshift of $z=1.4399$, exhibiting emission in \ion{C}{III}] and low line velocities ($|v|\lesssim$ 200 km/s).

25 pages, 31 figures

References in corpus (10)

• The Circumgalactic Medium
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• Ubiquitous outflows in DEEP2 spectra of star-forming galaxies at z=1.4
• The Chandra Deep Field-South Survey: 7 Ms Source Catalogs
• The Cosmic Baryon and Metal Cycles
• Mapping Large-Scale Gaseous Outflows in Ultraluminous Infrared Galaxies with Keck II ESI Spectra: Spatial Extent of the Outflow
• On the HI content, dust-to-gas ratio and nature of MgII absorbers
• Characterizing the Low-Redshift Intergalactic Medium towards PKS1302-102
• The MUSE Hubble Ultra Deep Field Survey: VII. FeII* Emission in Star-Forming Galaxies
• Connecting Galactic Outflows and Star Formation: Inferences from H-alpha Maps and Absorption Line Spectroscopy at 1 < z < 1.5