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Radial profiles of ...
Radial profiles of lensed z ∼ 1 galaxies on sub-kiloparsec scales
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Nagy, David (författare)
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Dessauges-Zavadsky, Miroslava (författare)
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Richard, Johan (författare)
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Schaerer, Daniel (författare)
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Combes, Francoise (författare)
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- Messa, Matteo (författare)
- Stockholms universitet,Institutionen för astronomi,Université de Genève, Switzerland
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Chisholm, John (författare)
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(creator_code:org_t)
- 2021-12-24
- 2021
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 657
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- galaxies: high-redshift
- galaxies: structure
- gravitational lensing: strong
- stars: formation
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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