2022A&A...657A..25N


Query : 2022A&A...657A..25N

2022A&A...657A..25N - Astronomy and Astrophysics, volume 657A, 25-25 (2022/1-1)

Radial profiles of lensed z ∼ 1 galaxies on sub-kiloparsec scales.

NAGY D., DESSAUGES-ZAVADSKY M., RICHARD J., SCHAERER D., COMBES F., MESSA M. and CHISHOLM J.

Abstract (from CDS):

We study the spatially resolved physical properties of the Cosmic Snake arc in MACS J1206.2-0847 and the arc in Abell 0521 (A521). These are two strongly lensed galaxies at redshifts z = 1.036 and z = 1.044. We used observations of the Hubble Space Telescope (HST) and the Atacama Large Millimeter/submillimeter Array (ALMA). The former gives access to the star formation rate (SFR) and stellar mass (M*), and the latter to the H2 molecular gas mass (Mmol). HST and ALMA observations have similar angular resolutions of 0.15'' - 0.2'', which with the help of strong gravitational lensing enable us to reach spatial resolutions down to ∼30 pc and ∼100 pc in these two galaxies, respectively. These resolutions are close to the resolution of observations of nearby galaxies. We study the radial profiles of SFR, M*, and Mmol surface densities of these high-redshift galaxies and compare the corresponding exponential scale lengths with those of local galaxies. We find that the scale lengths in the Cosmic Snake are about 0.5 kpc - 1.5 kpc, and they are 3-10 times larger in A521. This is a significant difference knowing that the two galaxies have comparable integrated properties. These high-redshift scale lengths are nevertheless comparable to those of local galaxies, which cover a wide distribution. The particularity of our high-redshift radial profiles is the normalisation of the Mmol surface density profiles (ΣMmol), which are offset by up to a factor of 20 with respect to the profiles of z = 0 counterparts. The SFR surface density profiles are also offset by the same factor as ΣMmol, as expected from the Kennicutt-Schmidt law.

Abstract Copyright: © ESO 2021

Journal keyword(s): galaxies: high-redshift - galaxies: structure - gravitational lensing: strong - stars: formation

VizieR on-line data: <Available at CDS (J/A+A/657/A25): list.dat fits/*>

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1612 1
2 [RSK2010] A 521 1 LeG 04 54 06.0 -10 13 23           ~ 3 0
3 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 233 0
4 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 870 1
5 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1054 2
6 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1296 4
7 [CSR2018] Cosmic Snake LeG 12 06 10.740 -08 48 03.65   24.04     22.05 ~ 6 0
8 MCS J1206.2-0847 ClG 12 06 12.2 -08 48 02           ~ 222 0
9 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1329 2
10 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4160 4

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2023.01.31-01:21:03

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