The intergalactic medium transmission towards z greater than or similar to 4 galaxies with VANDELS and the impact of dust attenuationx22c6;
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The intergalactic medium transmission towards z greater than or similar to 4 galaxies with VANDELS and the impact of dust attenuationx22c6; / Thomas, R.; Pentericci, L.; Le Fevre, O.; Zamorani, G.; Schaerer, D.; Amorin, R.; Castellano, M.; Carnall, A. C.; Cristiani, S.; Cullen, F.; Finkelstein, S. L.; Fontanot, F.; Guaita, L.; Hibon, P.; Hathi, N.; Fynbo, J. P. U.; Khusanova, Y.; Koekemoer, A. M.; McLeod, D.; McLure, R. J.; Marchi, F.; Pozzetti, L.; Saxena, A.; Talia, M.; Bolzonella, M.
In: Astronomy & Astrophysics, Vol. 634, A110, 19.02.2020.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The intergalactic medium transmission towards z greater than or similar to 4 galaxies with VANDELS and the impact of dust attenuationx22c6;
AU - Thomas, R.
AU - Pentericci, L.
AU - Le Fevre, O.
AU - Zamorani, G.
AU - Schaerer, D.
AU - Amorin, R.
AU - Castellano, M.
AU - Carnall, A. C.
AU - Cristiani, S.
AU - Cullen, F.
AU - Finkelstein, S. L.
AU - Fontanot, F.
AU - Guaita, L.
AU - Hibon, P.
AU - Hathi, N.
AU - Fynbo, J. P. U.
AU - Khusanova, Y.
AU - Koekemoer, A. M.
AU - McLeod, D.
AU - McLure, R. J.
AU - Marchi, F.
AU - Pozzetti, L.
AU - Saxena, A.
AU - Talia, M.
AU - Bolzonella, M.
PY - 2020/2/19
Y1 - 2020/2/19
N2 - Aims. Our aim is to estimate the intergalactic medium (IGM) transmission towards UV-selected star-forming galaxies at zx2004;greater than or similar to& x2004;4 and study the effect of the dust attenuation on these measurements.Methods. The UV spectrum of high-redshift galaxies is a combination of their intrinsic emission and the effect of the IGM absorption along their line of sight. Using data coming from the unprecedentedly deep spectroscopy from the VANDELS ESO public survey carried out with the VIMOS instrument, we compute both the dust extinction and the mean transmission of the IGM as well as its scatter from a set of 281 galaxies at zx2004;> x2004;3.87. Because of a degeneracy between the dust content of the galaxy and the IGM, we first estimate the stellar dust extinction parameter E(B - V) and study the result as a function of the dust prescription. Using these measurements as constraint for the spectral fit we estimate the IGM transmission Tr(Ly alpha). Both photometric and spectroscopic spectral energy distribution fits are performed using the SPectroscopy And photometRy fiTting tool for Astronomical aNalysis which is able to fit the spectral continuum of the galaxies as well as photometric data.Results. Using the classical Calzetti attenuation law we find that E(B - V) goes from 0.11 at zx2004;=& x2004;3.99 to 0.08 at zx2004;=& x2004;5.15. These results are in very close agreement with published measurements. We estimate the IGM transmission and find that the transmission is decreasing with increasing redshift from Tr(Ly alpha) = 0.53 at zx2004;=& x2004;3.99 to 0.28 at zx2004;=& x2004;5.15. We also find a large standard deviation around the average transmission that is more than 0.1 at every redshift. Our results are in very good agreement with both previous measurements from AGN studies and with theoretical models.
AB - Aims. Our aim is to estimate the intergalactic medium (IGM) transmission towards UV-selected star-forming galaxies at zx2004;greater than or similar to& x2004;4 and study the effect of the dust attenuation on these measurements.Methods. The UV spectrum of high-redshift galaxies is a combination of their intrinsic emission and the effect of the IGM absorption along their line of sight. Using data coming from the unprecedentedly deep spectroscopy from the VANDELS ESO public survey carried out with the VIMOS instrument, we compute both the dust extinction and the mean transmission of the IGM as well as its scatter from a set of 281 galaxies at zx2004;> x2004;3.87. Because of a degeneracy between the dust content of the galaxy and the IGM, we first estimate the stellar dust extinction parameter E(B - V) and study the result as a function of the dust prescription. Using these measurements as constraint for the spectral fit we estimate the IGM transmission Tr(Ly alpha). Both photometric and spectroscopic spectral energy distribution fits are performed using the SPectroscopy And photometRy fiTting tool for Astronomical aNalysis which is able to fit the spectral continuum of the galaxies as well as photometric data.Results. Using the classical Calzetti attenuation law we find that E(B - V) goes from 0.11 at zx2004;=& x2004;3.99 to 0.08 at zx2004;=& x2004;5.15. These results are in very close agreement with published measurements. We estimate the IGM transmission and find that the transmission is decreasing with increasing redshift from Tr(Ly alpha) = 0.53 at zx2004;=& x2004;3.99 to 0.28 at zx2004;=& x2004;5.15. We also find a large standard deviation around the average transmission that is more than 0.1 at every redshift. Our results are in very good agreement with both previous measurements from AGN studies and with theoretical models.
KW - galaxies
KW - high-redshift
KW - general
KW - intergalactic medium
KW - LY-ALPHA FOREST
KW - STAR-FORMATION
KW - RADIATIVE-TRANSFER
KW - INTERSTELLAR EXTINCTION
KW - PHOTOMETRIC REDSHIFTS
KW - CLUMPY UNIVERSE
KW - DEEP SURVEY
KW - OPACITY
KW - STELLAR
KW - EVOLUTION
U2 - 10.1051/0004-6361/201935925
DO - 10.1051/0004-6361/201935925
M3 - Journal article
VL - 634
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
M1 - A110
ER -
ID: 248026050