Probing the Star Formation Main Sequence down to $10^{8}$ M$_\odot$ at $1.0<z<3.0$

Understand

We investigate the star formation main sequence (MS) (SFR-M$_{\star}$) down to 10$^{8-9}\mathrm{M}_\odot$ using a sample of 34,061 newly-discovered ultra-faint ($27\lesssim i \lesssim 30$ mag) galaxies at $1<z<3$ detected in the GOODS-N field.

• Virtually these galaxies are not contained in previous public catalogs, effectively doubling the number of known sources in the field.
• The sample was constructed by stacking the optical broad-band observations taken by the HST/GOODS-CANDELS surveys as well as the 25 ultra-deep medium-band images gathered by the GTC/SHARDS project.
• Our sources are faint (average observed magnitudes $<i>\sim28.2$ mag, $<H>\sim27.9$ mag), blue (UV-slope $<\beta>\sim-1.9$), star-forming (rest-frame colors $<U-V>\sim0.10$ mag, $<V-J>\sim0.17$ mag) galaxies.