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26 April 2024 |
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Possible Signatures of a Cold-Flow Disk from MUSE using a z=1 galaxy--quasar pair towards SDSSJ1422-0001 | | N. Bouché
; H. Finley
; I. Schroetter
; M. T. Murphy
; P. Richter
; R. Bacon
; T. Contini
; J. Richard
; M. Wendt
; S. Kammann
; B. Epinat
; S. Cantalupo
; L. A. Straka
; J. Schaye
; C. L. Martin
; C. Péroux
; L. Wisotzki
; K. Soto
; S. Lilly
; M. Carollo
; J. Brinchman
; W. Kollatschny
; | | Date: |
27 Jan 2016 | | 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 ($3 imes R_{1/2}$). We estimate the mass accretion
rate $dot M_{
m in}$ 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
$log N_{
m HI} simeq 20.4$ 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 ($12+log
m O/H=8.7pm0.2$), 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. | | Source: | arXiv, 1601.7567 | | Services: | Forum | Review | PDF | Favorites | |
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