More Like this

1. NOEMA redshift measurements of bright Herschel galaxies

   https://doi.org/10.1051/0004-6361/201936988  

   Neri, R. ; Cox, P. ; Omont, A. ; Beelen, A. ; Berta, S. ; Bakx, T. ; Lehnert, M. ; Baker, A. J. ; Buat, V. ; Cooray, A. ; et al ( March 2020 , Astronomy & Astrophysics)

   Using the IRAM NOrthern Extended Millimeter Array (NOEMA), we conducted a program to measure redshifts for 13 bright galaxies detected in the Herschel Astrophysical Large Area Survey with S 500  μ m  ≥ 80 mJy. We report reliable spectroscopic redshifts for 12 individual sources, which are derived from scans of the 3 and 2 mm bands, covering up to 31 GHz in each band, and are based on the detection of at least two emission lines. The spectroscopic redshifts are in the range 2.08 <   z  <  4.05 with a median value of z  = 2.9 ± 0.6. The sources are unresolved or barely resolved on scales of 10 kpc. In one field, two galaxies with different redshifts were detected. In two cases the sources are found to be binary galaxies with projected distances of ∼140 kpc. The linewidths of the sources are large, with a mean value for the full width at half maximum of 700 ± 300 km s −1 and a median of 800 km s −1 . We analyze the nature of the sources with currently available ancillary data to determine if they are lensed or hyper-luminous ( L FIR  >  10 13   L ⊙ ) galaxies. We also present a reanalysis of the spectral energy distributions including the continuum flux densities measured at 3 and 2 mm to derive the overall properties of the sources. Future prospects based on these efficient measurements of redshifts of high- z galaxies using NOEMA are outlined, including a comprehensive survey of all the brightest Herschel galaxies. 

   more » « less
2. Evidence of Environmental Quenching at Redshift z ≈ 2

   https://doi.org/10.3847/1538-4357/aacc2c  

   Ji, Zhiyuan ; Giavalisco, Mauro ; Williams, Christina C. ; Faber, Sandra M. ; Ferguson, Henry C. ; Guo, Yicheng ; Liu, Teng ; Lee, Bomee ( August 2018 , The Astrophysical Journal)
3. Empirically Driven multiwavelength K -corrections at low redshift

   https://doi.org/10.1093/mnras/stad2369  

   Fielder, Catherine_E ; Andrews, Brett_H ; Newman, Jeffrey ; Salim, Samir ( August 2023 , Monthly Notices of the Royal Astronomical Society)

   K-corrections – a necessary ingredient for converting between flux in observed bands to flux in rest-frame bands – are critical for comparing galaxies at differing redshifts. These corrections often rely on fits to empirical or theoretical spectral energy distribution (SED) templates of galaxies. However, templates can only produce reliable K-corrections in regimes where SED models are robust. For instance, the templates utilized in some popular software packages are not well-constrained in some bands (e.g. WISE W4 in Kcorrect), which results in ill-behaved K-corrections. We address this shortcoming by developing an empirically driven approach to K-corrections that limits the dependence on SED templates. We perform a polynomial fit for the K-correction as a function of a galaxy’s rest-frame colour determined in a pair of well-constrained bands (e.g. 0(g − r)) and redshift, exploiting the fact that galaxy SEDs can be approximated as a one-parameter family at low redshift. For bands well-constrained by SED templates, our empirically driven K-corrections yield results comparable to the SED fitting methods used by Kcorrect and the GSWLC-M2 catalogue (the updated medium-deep GALEX–SDSS–WISE Legacy Catalogue). However, our method dramatically outperforms Kcorrect derived K-corrections for WISE W4. Our method is also robust to incorrect template assumptions outside of the optical bands and enforces that the K-correction must be zero at z = 0. Our K-corrected photometry and code are publicly available.

    

   more » « less
4. The Properties of GRB 120923A at a Spectroscopic Redshift of z ≈ 7.8

   https://doi.org/10.3847/1538-4357/aadba9  

   Tanvir, N. R. ; Laskar, T. ; Levan, A. J. ; Perley, D. A. ; Zabl, J. ; Fynbo, J. P. ; Rhoads, J. ; Cenko, S. B. ; Greiner, J. ; Wiersema, K. ; et al ( October 2018 , The Astrophysical Journal)
5. Complex Ly α Profiles in Redshift 6.6 Ultraluminous Ly α Emitters

   https://doi.org/10.3847/1538-4357/aac021  

   Songaila, A. ; Hu, E. M. ; Barger, A. J. ; Cowie, L. L. ; Hasinger, G. ; Rosenwasser, B. ; Waters, C. ( June 2018 , The Astrophysical Journal)