Abstract Details
| Name: Pranav Kukreti Affiliation: IISER, Mohali Conference ID: ASI2019_241 Title : Study of star formation in the EGS at z ~ 1 using the GMRT Authors and Co-Authors : Pranav Kukreti (IISER Mohali), Jasjeet Singh Bagla (IISER Mohali), Nissim Kanekar(NCRA-TIFR, Pune) Abstract Type : Oral Abstract Category : Extragalactic Astronomy Abstract : We have used the GMRT to image the central 625 sq. arcmin of the Extended Groth Strip (EGS) field at 1.4 GHz. The image has an RMS noise of 7.5 μJy at the centre and is one of the two lowest noise deep low-frequency radio continuum image available of the EGS. We have used the DEEP2 redshift survey to identify sources for a stacking analysis. The well known radio-FIR correlation has been used to convert the stacked luminosity to the star formation rate(SFR). We find a 16.32 σ resolved emission corresponding to an SFR of 20.19±1.24 solar mass/yr at z =1.061. We study the behaviour of SFR and specific SFR (sSFR = SFR/stellar mass) with redshift, stellar mass and the colour of the galaxies for a redshift range z = 0.2-1.45. We find the SFR and sSFR to be decreasing with redshift (from z ≈ 1.035 − 0.2) as a power law of (1+z) with the exponent = 4.02±1.02 and 3.12±0.65 for SFR and sSFR, respectively. We also observe a tight correlation between SFR and stellar mass (main sequence) with a slope =0.75±0.05 . We have also studied the evolution of the slope and intercept of the main-sequence with redshift. We found the dust attenuation factor(DAF) to be decreasing with redshift (from z ≈ 1.035 − 0.2) and that the DAF was dependent on stellar mass as log(DAF) = (0.41 ± 0.07)log(M) − 3.85 ± 0.77. The SFR and sSFR were found to be dependent on colour (c) as log(SFR) = (1.25 ± 0.22)c + (1.71 ± 0.05) and log(sSFR) = (−0.80 ± 0.19)c − (0.25 ± 0.05). |