We investigate the shape of the rotation curves (RCs) of z similar to 1 star-forming galaxies (SFGs) and compare them with local SFGs. For this purpose, we have used 344 galaxies from the K-band Multi-Object Spectrograph (KMOS) for Redshift One Spectroscopic Survey (KROSS). This sample covers the redshift range 0.57 <= z <= 1.04, the effective radii 0.69 <= R-e [kpc] <= 7.76, and the stellar masses 8.7 <= log (M-star[M-circle dot]) <= 11.32. Using (3D)BAROLO, we extract the H alpha kinematic maps and corresponding RCs. The main advantage of (3D)BAROLO is that it incorporates the beam smearing in the 3D observational space, which provide us with the intrinsic rotation velocity even in the low spatial resolution data. We have corrected the RCs for pressure support, which seems to be a more dominant effect than beam smearing in high-z galaxies. Only a combination of the three techniques (3D-kinematic modelling + 3D-beam smearing correction + pressure gradient correction) yields the intrinsic RC of an individual galaxy. Further, we present the co-added and binned RCs constructed out of 256 high-quality objects. We do not see any change in the shape of RCs with respect to the local SFGs. Moreover, we notice a significant evolution in the stellar-disc length (R-D) of the galaxies as a function of their circular velocity. Therefore, we conclude that the stellar disc of SFGs evolves over cosmic time (from z similar to 1) while the total mass stays constant (within similar to 20kpc).

Flat rotation curves of z ∼ 1 star-forming galaxies / Sharma, Gauri; Salucci, Paolo; Harrison, C M; van , ; de , ; Ven, Glenn; Lapi, Andrea. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 503:2(2021), pp. 1753-1772. [10.1093/mnras/stab249]

Flat rotation curves of z ∼ 1 star-forming galaxies

Sharma, Gauri
;
Salucci, Paolo;Lapi, Andrea
2021-01-01

Abstract

We investigate the shape of the rotation curves (RCs) of z similar to 1 star-forming galaxies (SFGs) and compare them with local SFGs. For this purpose, we have used 344 galaxies from the K-band Multi-Object Spectrograph (KMOS) for Redshift One Spectroscopic Survey (KROSS). This sample covers the redshift range 0.57 <= z <= 1.04, the effective radii 0.69 <= R-e [kpc] <= 7.76, and the stellar masses 8.7 <= log (M-star[M-circle dot]) <= 11.32. Using (3D)BAROLO, we extract the H alpha kinematic maps and corresponding RCs. The main advantage of (3D)BAROLO is that it incorporates the beam smearing in the 3D observational space, which provide us with the intrinsic rotation velocity even in the low spatial resolution data. We have corrected the RCs for pressure support, which seems to be a more dominant effect than beam smearing in high-z galaxies. Only a combination of the three techniques (3D-kinematic modelling + 3D-beam smearing correction + pressure gradient correction) yields the intrinsic RC of an individual galaxy. Further, we present the co-added and binned RCs constructed out of 256 high-quality objects. We do not see any change in the shape of RCs with respect to the local SFGs. Moreover, we notice a significant evolution in the stellar-disc length (R-D) of the galaxies as a function of their circular velocity. Therefore, we conclude that the stellar disc of SFGs evolves over cosmic time (from z similar to 1) while the total mass stays constant (within similar to 20kpc).
503
2
1753
1772
https://arxiv.org/abs/2005.00279
Sharma, Gauri; Salucci, Paolo; Harrison, C M; van&nbsp;, ; de&nbsp;, ; Ven, Glenn; Lapi, Andrea
File in questo prodotto:
File Dimensione Formato  
Sharma21.pdf

accesso aperto

Tipologia: Versione Editoriale (PDF)
Licenza: Non specificato
Dimensione 9.63 MB
Formato Adobe PDF
9.63 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/123839
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 7
  • ???jsp.display-item.citation.isi??? 8
social impact