J/A+A/643/A4 ALPINE-ALMA [CII] survey. IR luminosity (Fudamoto+, 2020)
The ALPINE-ALMA [CII] survey. Dust attenuation properties and obscured star
formation at z ∼ 4.4-5.8.
Fudamoto Y., Oesch P.A., Faisst A., Bethermin M., Ginolfi M., Khusanova Y.,
Loiacono F., Le Fevre O., Capak P., Schaerer D., Silverman J.D.,
Cassata P., Yan L., Amorin R., Bardelli S., Boquien M., Cimatti A.,
Dessauges-zavadsky M., Fujimoto S., Gruppioni C., Hathi N.P., Ibar E.,
Jones G.C., Koekemoer A.M., Lagache G., Lemaux B.C., Maiolino R.,
Narayanan D., Pozzi F., Riechers D.A., Rodighiero G., Talia M., Toft S.,
Vallini L., Vergani D., Zamorani G., Zucca E.
<Astron. Astrophys., 643, A4 (2020)>
=2020A&A...643A...4F 2020A&A...643A...4F (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Interstellar medium ; Galaxy catalogs ; Redshifts ;
Millimetric/submm sources ; Ultraviolet
Keywords: galaxies: high-redshift - galaxies: ISM - dust - extinction
Abstract:
We present dust attenuation properties of spectroscopically confirmed
star forming galaxies on the main sequence at a redshift of ∼4.4-5.8.
Our analyses are based on the far infrared continuum observations of
118 galaxies at rest-frame 158 µm obtained with the Atacama Large
Millimeter Array (ALMA) Large Program to INvestigate [CII] at Early
times (ALPINE). We study the connection between the ultraviolet (UV)
spectral slope (β), stellar mass (M*), and infrared excess
(IRX=LIR/LUV). Twenty-three galaxies are individually detected in
the continuum at > 3.5σ significance. We perform a stacking
analysis using both detections and nondetections to study the average
dust attenuation properties at z∼4.4-5.8. The individual detections
and stacks show that the IRX-β relation at z∼5 is consistent with
a steeper dust attenuation curve than typically found at lower
redshifts (z<4). The attenuation curve is similar to or even steeper
than that of the extinction curve of the Small Magellanic Cloud. This
systematic change of the IRX-β relation as a function of redshift
suggests an evolution of dust attenuation properties at z>4.
Similarly, we find that our galaxies have lower IRX values, up to 1dex
on average, at a fixed mass compared to previously studied IRX-M*
relations at z≤4, albeit with significant scatter. This implies a
lower obscured fraction of star formation than at lower redshifts. Our
results suggest that dust properties of UV-selected star forming
galaxies at z≥4 are characterised by (i) a steeper attenuation curve
than at z≤4, and (ii) a rapidly decreasing dust obscured fraction of
star formation as a function of redshift. Nevertheless, even among
this UV-selected sample, massive galaxies (logM*/M☉>10) at z∼5-6
already exhibit an obscured fraction of star formation of ∼45%,
indicating a rapid build-up of dust during the epoch of reionization.
Description:
We have examined the IRX-β relation, the IRX-M* relation, and
the obscured fraction of star formation as a function of stellar mass
(fobs-M* relation) of UV-selected main-sequence star forming
galaxies at z∼4.4-5.8 using λrest=158um continuum
observations of 118 galaxies from the ALMA large program, ALPINE. The
sample has secure spectroscopic redshifts, but is nevertheless
representative of star forming galaxies, that is to say the
distribution of SFRs and M* are consistent with normal main-sequence
galaxies in the observed redshift range: log(M*/M☉)∼8.5-11.5 and
log(SFR/M☉/yr)∼0.5-2.5 (see Faisst et al. 2020ApJS..247...61F 2020ApJS..247...61F).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 54 116 Summary of the total IR luminosity
(λ=8-1000um) estimations of our sample
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See also:
J/A+A/643/A2 : ALPINE DR1 merged catalog (Bethermin+, 2020)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 22 A22 --- Name Name
25- 28 F4.2 --- z Redshift
30- 35 F6.2 --- beta ?=-99 ultraviolet spectral slope
37 A1 --- l_LIRMeas Limit flag on LIRMeas (3σ)
38- 42 F5.2 [Lsun] LIRMeas IR luminosity calculated using the FIR SED
template from Bethermin et al. (2020,
Cat. J/A+A/643/A2)
44- 48 F5.2 [Lsun] LIR-2.23 ?=- Estimated total infrared luminosity using
our best fit IRX-β relations assuming
β0=-2.23 (1)
50- 54 F5.2 [Lsun] LIR-2.6 ?=- Estimated total infrared luminosity using
our best fit IRX-β relations assuming
β0=-2.62 (our fiducial value) (1)
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Note (1): The "---" sign indicates that the UV slope of the galaxy is bluer
than the assumed intrinsic β (i.e., the estimated LIR is consistent
with zero).
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History:
From electronic version of the journal
References:
Faisst et al., 2020ApJS..247...61F 2020ApJS..247...61F,
The ALPINE-ALMA [CII] survey: Multiwavelength ancillary data and basic
physical measurements
Le Fevre et al. 2020A&A...643A...1L 2020A&A...643A...1L, arXiv:1910.09517,
The ALPINE-ALMA [CII] survey. Survey strategy, observations, and sample
properties of 118 star-forming galaxies at 4<z<6
Fujimoto et al. 2020ApJ...900....1F 2020ApJ...900....1F, arXiv:2003.00013
The ALPINE-ALMA [CII] survey: Size of individual star-forming galaxies
at z=4-6 and their extended halo structure
Schaerer et al., 2020A&A...643A...3S 2020A&A...643A...3S
The ALPINE-ALMA [CII] survey. Little to no evolution in the [CII]-SFR
relation over the last 13 Gyr
Fudamoto et al., 2020A&A...643A...4F 2020A&A...643A...4F
The ALPINE-ALMA [CII] survey: Dust attenuation properties and obscured
star formation at z∼4.4-5.8
Dessauges-Zavadsky et al., 2020A&A...643A...5D 2020A&A...643A...5D, arXiv:2004.10771,
The ALPINE-ALMA [CII] survey: Molecular gas budget in the Early Universe
as traced by [CII]
Cassata et al., 2020A&A...643A...6C 2020A&A...643A...6C
The ALPINE-ALMA [CII] survey. Small Lyalpha-[CII] velocity offsets in
main-sequence galaxies at 4.4<z<6
Ginolfi et al., 2020A&A...643A...7G 2020A&A...643A...7G, arXiv:2004.13737,
The ALPINE-ALMA [CII] survey. Circumgalactic medium pollution and gas
mixing by tidal stripping in a merging system at z∼4.57
Gruppioni et al., 2020A&A...643A...8G 2020A&A...643A...8G, arXiv:2006.04974,
The ALPINE-ALMA [CII] survey: nature, luminosity function and star
formation history of continuum non-target galaxies up to z∼6
Khusanova et al., 2020, A&A in press, arXiv:2007.08384,
The ALPINE-ALMA [CII] Survey: Obscured star formation rate density and
main sequence of star-Forming galaxies at z>4
Loiacono et al., 2020, A&A in press, arXiv:2006.04837,
The ALPINE-ALMA [CII] survey: the luminosity function of serendipitous
[CII] line emitters at z∼5
Yan et al, 2020ApJ...905..147Y 2020ApJ...905..147Y, arXiv:2006.04835,
The ALPINE-ALMA [CII] survey: [CII]158micron emission line luminosity
functions at z∼4-6
Fudamoto et al., 2020, A&A in press, arXiv:2004.10760
The ALPINE-ALMA [CII] survey: Dust attenuation properties and obscured
star-formation at z∼4.4-5.8
Romano et al., 2020MNRAS.496..875R 2020MNRAS.496..875R, arXiv:2002.00961,
The ALPINE-ALMA [CII] survey: On the nature of an extremely obscured
serendipitous galaxy
Jones et al., 2020MNRAS.491L..18J 2020MNRAS.491L..18J, arXiv:1908.07777,
The ALPINE-ALMA [CII] survey: A triple merger at z∼4.56
(End) Patricia Vannier [CDS] 20-Jan-2021