J/MNRAS/485/1961 List of 22 MEGAFLOW fields (Zabl+, 2019)
MusE GAs FLOw and Wind (MEGAFLOW).
II. A study of gas accretion around z ≃ 1 star-forming galaxies with
background quasars.
Zabl J., Bouche N.F., Schroetter I., Wendt M., Finley H., Schaye J.,
Conseil S., Contini T., Marino R.A., Mitchell P., Muzahid S., Pezzulli G.,
Wisotzki L.
<Mon. Not. R. Astron. Soc., 485, 1961-1980 (2019)>
=2019MNRAS.485.1961Z 2019MNRAS.485.1961Z (SIMBAD/NED BibCode)
ADC_Keywords: Star Forming Region ; QSOs ; Redshifts ; Optical
Keywords: galaxies: evolution - galaxies: formation - galaxies: haloes -
galaxies: kinematics and dynamics - quasars: absorption lines
Abstract:
We use the MusE GAs FLOw and Wind (MEGAFLOW) survey to study the
kinematics of extended disc-like structures of cold gas around z≃1
star-forming galaxies. The combination of VLT/MUSE and VLT/UVES
observations allows us to connect the kinematics of the gas measured
through MgII quasar absorption spectroscopy to the kinematics and
orientation of the associated galaxies constrained through integral
field spectroscopy. Confirming previous results, we find that the
galaxy-absorber pairs of the MEGAFLOW survey follow a strong bimodal
distribution, consistent with a picture of MgII absorption being
predominantly present in outflow cones and extended disc-like
structures. This allows us to select a bona-fide sample of
galaxy-absorber pairs probing these discs for impact parameters of
10-70kpc. We test the hypothesis that the disc-like gas is
co-rotating with the galaxy discs, and find that for seven out of nine
pairs the absorption velocity shares the sign of the disc velocity,
disfavouring random orbits. We further show that the data are roughly
consistent with inflow velocities and angular momenta predicted by
simulations, and that the corresponding mass accretion rates are
sufficient to balance the star formation rates.
Description:
Using our ongoing MEGAFLOW survey (Schroetter et al.
2016ApJ...833...39S 2016ApJ...833...39S, Bouche et al. in preparation; Schroetter et al.
in preparation), which targets galaxies around 79 strong MgII
absorbers (with EW27960≳0.3Å) at ≃1 with the VLT/MUSE
spectrograph, we have investigated the distribution and kinematic
properties of this low-ionization gas.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 120 22 Details of MUSE observations for the
22 MEGAFLOW fields as used in this study
tablec2.dat 171 22 Details of UVES observations for the
22 MEGAFLOW fields as used in this study
table3.dat 78 16 Absorber-galaxy identification
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Quasar Quasar/field identifier
(JHHMMmNNMM or JHHMMpHHMM)
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 21 F4.1 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 31 I2 arcsec DEs Declination (J2000)
33- 36 F4.1 ks Texp Total MUSE exposure time
38- 41 F4.2 arcsec SeeingG Seeing full width at half maximum (FWHM)
measured at 7050Å by fitting a Gaussian
43- 46 F4.2 arcsec SeeingM Seeing FWHM measured at 7050Å by fitting a
Moffat profile with beta=2.5
48- 57 A10 --- Date1 Date of observation
58 A1 --- --- [,]
60- 69 A10 --- Date2 Date of observation
70 A1 --- --- [,]
72- 81 A10 --- Date3 Date of observation
83- 95 A13 --- ProgID1 ESO Program ID
96 A1 --- --- [,]
98-110 A13 --- ProgID2 ESO Program ID
112-120 A9 --- Ref Reference (Paper I =
Schroetter et al., 2016ApJ...833...39S 2016ApJ...833...39S)
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Byte-by-byte Description of file: tablec2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Quasar Quasar/field identifier
(JHHMMmNNMM or JHHMMpHHMM)
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 21 F4.1 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 31 I2 arcsec DEs Declination (J2000)
33- 36 F4.2 --- zem Emission redshift
38- 42 I5 s Texp1 Total UVES exposure time, setting 1
44- 47 I4 s Texp2 ? Total UVES exposure time, setting 2
49- 51 F3.1 arcsec Seeing1 Seeing full width at half maximum (FWHM)
measured by DIMM, setting 1
53- 55 F3.1 arcsec Seeing2 ? Seeing full width at half maximum (FWHM)
measured by DIMM, setting 2
56 A1 --- n_Seeing2 [a] Note on Seein2 (1)
57- 66 A10 --- Date1 Date of observation
67 A1 --- --- [,]
69- 78 A10 --- Date2 Date of observation
79 A1 --- --- [,]
81- 90 A10 --- Date3 Date of observation
92-103 A12 --- Setting1 UVES setting
104 A1 --- --- [,]
106-117 A12 --- Setting2 UVES setting
119-131 A13 --- ProgID1 ESO Program ID
132 A1 --- --- [,]
134-146 A13 --- ProgID2 ESO Program ID
147 A1 --- --- [,]
149-161 A13 --- ProgID3 ESO Program ID
163-171 A9 --- Ref Reference (Paper I =
Schroetter et al., 2016ApJ...833...39S 2016ApJ...833...39S)
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Note (1): a: For part of the observations DIMM measurements unavailable.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Field Field name
12- 16 F5.3 --- zabs Field zabs
18- 32 A15 --- Gal Galaxy name, galNNNNNN_NNN (1)
33 A1 --- n_Gal [*] * for primary galaxy in the field
35- 36 I2 h RAh Galaxy right ascension (J2000)
38- 39 I2 min RAm Galaxy right ascension (J2000)
41- 45 F5.2 s RAs Galaxy right ascension (J2000)
47 A1 --- DE- Galaxy declination sign (J2000)
48- 49 I2 deg DEd Galaxy declination (J2000)
51- 52 I2 arcmin DEm Galaxy declination (J2000)
54- 57 F4.1 arcsec DEs Galaxy declination (J2000)
59- 61 I3 kpc b Impact parameter
63- 66 I4 km/s Deltav Velocity offset of galaxy redshift from
SDSS-based MgII absorber redshift (2)
68- 72 F5.2 10-20W/m2 F[OII] ?=- [OII] flux (in 10-17erg/s/cm2)
74- 77 F4.2 10-20W/m2 e_F[OII] ? Error on [OII] flux
78 A1 --- Note [abcd] Note (3)
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Note (1): The first number in the ID indicates the absorber redshift,
the second the impact parameter in arcsec, and the
third the PA between quasar and galaxy in degrees.
Note (2): as obtained from the 1D line flux (fluxes are measured in large
SEXTRACTOR MAG AUTO apertures, but not aperture corrected).
Note (3): Notes as follows:
a = blend w. foreground galaxy
b = passive HK
c = aligned with minor axis to quasar
d = at this redshift Ca H&K falls outside of the MUSE wavelength range and
our automatic detection would miss quiescent galaxies without any
residual [OII] line emission. As an alternative, we checked here for
stellar MgII λ2796, 2803 absorption, but did not find any
additional candidates.
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History:
From electronic version of the journal
References:
Schroetter et al., Paper I 2016ApJ...833...39S 2016ApJ...833...39S
(End) Patricia Vannier [CDS] 08-Sep-2023