The Lyα Reference Sample. XIV. Lyα Imaging of 45 Low-redshift Star-forming Galaxies and Inferences on Global Emission

Melinder, Jens; Östlin, Göran; Hayes, Matthew; Rasekh, Armin; Más‐Hesse, J. M.; Cannon, John; Kunth, D.; Laursen, Peter; Runnholm, Axel; Herenz, Edmund Christian; Messa, Matteo; Verhamme, Anne; Rivera-Thorsen, T. Emil; Guaita, L.; Marquart, Thomas; Puschnig, Johannes; Reste, Alexandra Le; Sandberg, Andreas; Freeland, Emily; Bridge, Joanna S.

doi:10.3847/1538-4365/acc2b8

Cited by 3 publications

(1 citation statement)

References 102 publications

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“…Figure 2 shows a stacked NIRCam image (including all filters at λ > 3 μm) convolved to the resolution of the F1000W data (FWHM = 0 328). Each calibrated individual NIRCam filter was rebinned to a 0 06 pixel scale and point-spread function (PSF) matched to F1000W using WebbPSF (v. 1.2.1; Perrin et al 2014) models and the method described in Melinder et al (2023) and then median-stacked. We measured the centroid of the source for both JWST instruments (using photutils with a circular footprint of 3 pixels in radius), finding an agreement within 0.26 pixels, i.e., 0 016.…”

Section: Jwst/nircam Measurementsmentioning

confidence: 99%

A NIRCam-dark Galaxy Detected with the MIRI/F1000W Filter in the MIDIS/JADES Hubble Ultra Deep Field

Pérez-González,

Rinaldi,

Caputi

et al. 2024

ApJL

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We report the discovery of Cerberus, an extremely red object detected with the MIRI Deep Imaging Survey (MIDIS) observations in the F1000W filter of the Hubble Ultra Deep Field. The object is detected at signal-to-noise ratio (S/N) ∼ 6, with F1000W ∼ 27 mag, and undetected in the NIRCam data gathered by the JWST Advanced Deep Extragalactic Survey (JADES), fainter than the 30.0–30.5 mag 5σ detection limits in individual bands, as well as in the MIDIS F560W ultradeep data (∼29 mag, 5σ). Analyzing the spectral energy distribution built with low-S/N (<5) measurements in individual optical-to-mid-infrared filters and higher-S/N (≳5) measurements in stacked NIRCam data, we discuss the possible nature of this red NIRCam-dark source using a battery of codes. We discard the possibility of Cerberus being a solar system body based on the <0.″016 proper motion in the 1 yr apart JADES and MIDIS observations. A substellar Galactic nature is deemed unlikely, given that the Cerberus’s relatively flat NIRCam-to-NIRCam and very red NIRCam-to-MIRI flux ratios are not consistent with any brown dwarf model. The extragalactic nature of Cerberus offers three possibilities: (1) a z ∼ 0.4 galaxy with strong emission from polycyclic aromatic hydrocarbons—the very low inferred stellar mass, M ⋆ = 105–106 M ⊙, makes this possibility highly improbable; (2) a dusty galaxy at z ∼ 4 with an inferred stellar mass M ⋆ ∼ 108 M ⊙; and (3) a galaxy with observational properties similar to those of the reddest little red dots discovered around z ∼ 7, but Cerberus lying at z ∼ 15, with the rest-frame optical dominated by emission from a dusty torus or a dusty starburst.

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Section: Jwst/nircam Measurementsmentioning

confidence: 99%

A NIRCam-dark Galaxy Detected with the MIRI/F1000W Filter in the MIDIS/JADES Hubble Ultra Deep Field

Pérez-González,

Rinaldi,

Caputi

et al. 2024

ApJL

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A galactic outflow traced by its extended Mg II emission out to a ∼30 kpc radius in the Hubble Ultra Deep Field with MUSE

Pessa,

Wisotzki,

Urrutia

et al. 2024

A&A

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We report the discovery of a rare Mg IIλλ2796, 2803 doublet emission halo around a star-forming galaxy with log(M⋆/M⊙) = 10.3 ± 0.3 at z = 0.737 in deep (9.94 h) VLT/MUSE data from the MUSE-HUDF mosaic. While the central region prominently displays an absorption-dominated Mg II doublet characterized by discernible P-Cyg features, our examination reveals a remarkably extended Mg II emission spanning approximately ∼30 kpc from the central galaxy. We introduce a simple outflow radiative transfer modeling scheme based on the Sobolev approximation, and we employed a Bayesian Monte Carlo Markov chain fitting to find the best-fitting parameters that match our data. The model reproduces several key features of the observed Mg II halo and allowed us to constrain the kinematics and geometry of the outflowing gas. Our data are consistent with a biconical wind whose velocity increases with radius, pointing nearly toward the observer, with an opening angle of 59 ± 4°. In general, we find that our outflow model performs better in the inner regions of the galactic wind (≲10 kpc ≈6 half-light radii), reaching a velocity of ∼120 km s−1 at 10 kpc from the central galaxy. However, discrepancies between the data and the model in the outer regions suggest the possible influence of additional mechanisms, such as inflows, satellite interactions, or turbulence, which might significantly shape the circumgalactic medium (CGM) of galaxies at larger impact parameters. This analysis underscores the complexity of galactic outflows and encourages further exploration of the processes governing the dynamics of galactic winds through spatially resolved studies of the CGM.

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Connecting Lyα and Ionizing Photon Escape in the Sunburst Arc

Owens,

Kim,

Bayliss

et al. 2024

ApJ

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We investigate the Lyα and Lyman continuum (LyC) properties of the Sunburst Arc, a z = 2.37 gravitationally lensed galaxy with a multiply imaged, compact region leaking LyC and a triple-peaked Lyα profile indicating direct Lyα escape. Non-LyC-leaking regions show a redshifted Lyα peak, a redshifted and central Lyα peak, or a triple-peaked Lyα profile. We measure the properties of the Lyα profile from different regions of the galaxy using R ∼ 5000 Magellan/Magellan Echellette spectra. We compare the Lyα spectral properties to LyC and narrowband Lyα maps from Hubble Space Telescope imaging to explore the subgalactic Lyα−LyC connection. We find strong correlations (Pearson correlation coefficient r > 0.6) between the LyC escape fraction ( f esc LyC ) and Lyα (1) peak separation v sep, (2) ratio of the minimum flux density between the redshifted and blueshifted Lyα peaks to continuum flux density f min / f cont , and (3) equivalent width. We favor a complex H i geometry to explain the Lyα profiles from non-LyC-leaking regions and suggest two H i geometries that could diffuse and/or rescatter the central Lyα peak from the LyC-leaking region into our sight line across transverse distances of several hundred parsecs. Our results emphasize the complexity of Lyα radiative transfer and its sensitivity to the anisotropies of H i gas on subgalactic scales. Large differences in the physical scales on which we observe spatially variable direct-escape Lyα, blueshifted Lyα, and escaping LyC photons in the Sunburst Arc underscore the importance of resolving the physical scales that govern Lyα and LyC escape.

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The Lyα Reference Sample. XIV. Lyα Imaging of 45 Low-redshift Star-forming Galaxies and Inferences on Global Emission

Cited by 3 publications

References 102 publications

A NIRCam-dark Galaxy Detected with the MIRI/F1000W Filter in the MIDIS/JADES Hubble Ultra Deep Field

A NIRCam-dark Galaxy Detected with the MIRI/F1000W Filter in the MIDIS/JADES Hubble Ultra Deep Field

A galactic outflow traced by its extended Mg II emission out to a ∼30 kpc radius in the Hubble Ultra Deep Field with MUSE

Connecting Lyα and Ionizing Photon Escape in the Sunburst Arc

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