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GA-NIFS: JWST/NIRSpec IFS view of the z ∼ 3.5 galaxy GS5001 and its close environment at the core of a large-scale overdensity
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DOI：10.1051/0004-6361/202451021.png)
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Abstract
En 中文
We present JWST Near-Infrared Spectrograph (NIRSpec) observations in integral field spectroscopic (IFS) mode of the galaxy GS5001 at redshift z = 3.47, the central member of a candidate protocluster in the GOODS-S field. The data cover a field of view (FoV) of 4 '' x 4 '' (similar to 30 x 30 kpc(2)) and were obtained as part of the Galaxy Assembly with NIRSpec IFS (GA-NIFS) GTO programme. The observations include both high (R similar to 2700) and low (R similar to 100) spectral resolution data, spanning the rest-frame wavelength ranges 3700-6780 & Aring; and 1300-11850 & Aring;, respectively. These observations enable the detection and mapping of the main optical emission lines from [O II]lambda lambda 3726, 29 to [S III]lambda 9531. We analysed the spatially resolved ionised gas kinematics and interstellar medium properties, including obscuration, gas metallicity, excitation, ionisation parameter, and electron density. In addition to the main galaxy (GS5001), the NIRSpec FoV covers a close companion in the south, with three sub-structures with velocities blueshifted by similar to - 150 km s(-1) with respect to GS5001, and another source in the north redshifted by similar to 200 km s(-1). Optical line ratio diagnostics indicate star formation ionisation and electron densities of similar to 500 cm(-3) across all sources in the FoV. The gas-phase metallicity in the main galaxy is 12+log(O/H) = 8.45 +/- 0.04, and slightly lower in the companions (12+log(O/H) = 8.34 - 8.42), consistent with the mass-metallicity relation at z similar to 3. We find peculiar line ratios (high log[N II]/H alpha = [-0.45, -0.3], low log[O III]/H beta = [0.06, 0.10]) in the northern part of GS5001. These could be attributed to either higher metallicity, or to shocks resulting from the interaction of the main galaxy with the northern source. We identify a spatially resolved outflow in the main galaxy, traced by a broad symmetric component in H alpha and [O III], with an extension of about 3 kpc. We find maximum outflow velocities of similar to 400 km s(-1), an outflow mass of (1.7 +/- 0.4)x10(8) M-circle dot, a mass outflow rate of 23 +/- 5 M-circle dot yr(-1), and a mass loading factor of 0.23. These properties are compatible with star formation being the driver of the outflow. Our analysis of these JWST NIRSpec IFS data therefore provides valuable, unprecedented insights into the interplay between star formation, galactic outflows, and interactions in the core of a z similar to 3.5 candidate protocluster.
Keywords:
galaxies: evolution
galaxies: high-redshift
galaxies: ISM
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5.8
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5.0W
Citations:
18.3W
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