Studying [C II] emission in low-mass galaxies at z ~ 7

Glazer, Kelsey (avtor), Bradač, Maruša (avtor), Sanders, Ryan L. (avtor), Fujimoto, Seiji (avtor), Bolan, Patricia (avtor), Ferrara, Andrea (avtor), Strait, Victoria (avtor), Jones, Tucker (avtor), Lemaux, Brian C. (avtor)

We report on a [CII]$_{158\mu\mathrm{m}}$ search using the Atacama Large Millimeter/submillimeter Array (ALMA) on three lensed, confirmed Ly$\alpha$ emitting galaxies at z ∼ 7. Our targets are ultraviolet (UV) faint systems with stellar masses on the order of M$_*$ ∼ $10^9\ \mathrm{M}_{\odot}$. We detect a single [C II] line emission (4$\sigma$) from the brightest (L ∼ 2.4 × $10^{10}\ \mathrm{L}_\odot$) galaxy in our sample, MACS0454-1251. We determine a systemic redshift (z$_{[C II]}$ = 6.3151 ± 0.0005) for MACS0454-1251 and measure a Ly$\alpha$ velocity offset of $\Delta v \approx 300 \pm 70\mathrm{km\ s^{-1}}$⁠. The remaining two galaxies we detect no [C II] but provide 3$\sigma$ upper limits on their [C II] line luminosities which we use to investigate the $L_{[C II]}-\mathrm{SFR}$ relation. Overall our single [C II] detection shows agreement with the relation for local dwarf galaxies. Our [C II] deficient galaxies could potentially be exhibiting low metallicities (Z < Z$_{\odot}$). Another possible explanation for weaker [C II] emission could be strong feedback from star formation disrupting molecular clouds. We do not detect continuum emission in any of the sources, placing upper limits on their dust masses. Assuming a single dust temperature of $T_d=35\mathrm{K}$ dust masses ($\mathrm{M_{dust}}$) range from < 4.8 × $10^7\ \mathrm{M}_\odot$ to 2.3 × $10^8\ \mathrm{M}_\odot$. Collectively, our results suggest faint reionization era sources could be metal poor and/or could have strong feedback suppressing [C II] emission.

• Jezik: Angleški jezik
• Ključne besede: high-redshift galaxies, gravitational lensing
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: Str. 945-952
• Številčenje: Vol. 531, iss. 1
• PID: 20.500.12556/RUL-160387
• UDK: 524.8
• ISSN pri članku: 1365-2966
• DOI: 10.1093/mnras/stae1178
• COBISS.SI-ID: 205494275
• Datum objave v RUL: 27.08.2024

Gradivo je del revije

• Naslov: Monthly notices of the Royal Astronomical Society
• Skrajšan naslov: Mon. not. R. Astron. Soc.
• Založnik: Blackwell Science
• ISSN: 1365-2966
• COBISS.SI-ID: 1870180

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: galaksije z velikim rdečim premikom, gravitacijsko lečenje