Strong Mg ii and Fe ii Absorbers at 2.2 <z <6.0
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Strong Mg ii and Fe ii Absorbers at 2.2 <z <6.0. / Zou, Siwei; Jiang, Linhua; Shen, Yue; Wu, Jin; Banados, Eduardo; Fan, Xiaohui; Ho, Luis C.; Riechers, Dominik A.; Venemans, Bram; Vestergaard, Marianne; Walter, Fabian; Wang, Feige; Willott, Chris J.; Joshi, Ravi; Wu, Xue-Bing; Yang, Jinyi.
I: Astrophysical Journal, Bind 906, Nr. 1, 32, 01.01.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Strong Mg ii and Fe ii Absorbers at 2.2 <z <6.0
AU - Zou, Siwei
AU - Jiang, Linhua
AU - Shen, Yue
AU - Wu, Jin
AU - Banados, Eduardo
AU - Fan, Xiaohui
AU - Ho, Luis C.
AU - Riechers, Dominik A.
AU - Venemans, Bram
AU - Vestergaard, Marianne
AU - Walter, Fabian
AU - Wang, Feige
AU - Willott, Chris J.
AU - Joshi, Ravi
AU - Wu, Xue-Bing
AU - Yang, Jinyi
PY - 2021/1/1
Y1 - 2021/1/1
N2 - We present a study of strong intervening absorption systems in the near-IR spectra of 31 luminous quasars at z > 5.7. The quasar spectra were obtained with Gemini GNIRS that provide continuous wavelength coverage from similar to 0.9 to similar to 2.5 mu m. We detect 32 strong Mg ii doublet absorbers with rest-frame equivalent width W-r(lambda 2796) > 1.0 A at 2.2 z ii absorber is confirmed by at least two associated Fe ii absorption lines in the rest-frame wavelength range of similar to 1600-2600 A. We find that the comoving line density (dN/dX) of the strong Fe ii-bearing Mg ii absorbers decreases toward higher redshift at z > 3, consistent with previous studies. Compared with strong Mg ii absorbers detected in damped Ly alpha systems at 2 z <4, our absorbers are potentially less saturated and show much larger rest-frame velocity widths. This suggests that the gas traced by our absorbers are potentially affected by galactic superwinds. We analyze the Hubble Space Telescope near-IR images of the quasars and identify possible associated galaxies for our strong absorbers. There are a maximum of two galaxy candidates found within 5 '' radius of each absorber. The median F105W-band magnitude of these galaxy candidates is 24.8 mag, which is fainter than the L* galaxy luminosity at z similar to 4. By using our observed dN/dX of strong Mg ii absorbers and galaxy candidates median luminosity, we suggest that at high redshift, strong Mg ii absorbers tend to have a more disturbed environment but smaller halo size than that at z <1.
AB - We present a study of strong intervening absorption systems in the near-IR spectra of 31 luminous quasars at z > 5.7. The quasar spectra were obtained with Gemini GNIRS that provide continuous wavelength coverage from similar to 0.9 to similar to 2.5 mu m. We detect 32 strong Mg ii doublet absorbers with rest-frame equivalent width W-r(lambda 2796) > 1.0 A at 2.2 z ii absorber is confirmed by at least two associated Fe ii absorption lines in the rest-frame wavelength range of similar to 1600-2600 A. We find that the comoving line density (dN/dX) of the strong Fe ii-bearing Mg ii absorbers decreases toward higher redshift at z > 3, consistent with previous studies. Compared with strong Mg ii absorbers detected in damped Ly alpha systems at 2 z <4, our absorbers are potentially less saturated and show much larger rest-frame velocity widths. This suggests that the gas traced by our absorbers are potentially affected by galactic superwinds. We analyze the Hubble Space Telescope near-IR images of the quasars and identify possible associated galaxies for our strong absorbers. There are a maximum of two galaxy candidates found within 5 '' radius of each absorber. The median F105W-band magnitude of these galaxy candidates is 24.8 mag, which is fainter than the L* galaxy luminosity at z similar to 4. By using our observed dN/dX of strong Mg ii absorbers and galaxy candidates median luminosity, we suggest that at high redshift, strong Mg ii absorbers tend to have a more disturbed environment but smaller halo size than that at z <1.
KW - Circumgalactic medium
KW - Extragalactic astronomy
KW - Quasar absorption line spectroscopy
KW - MUSE GAS-FLOW
KW - Z LESS-THAN
KW - COOL GAS
KW - ABSORPTION
KW - GALAXIES
KW - SYSTEMS
KW - SUPERWINDS
KW - MEGAFLOW
KW - MASS
KW - QSOS
U2 - 10.3847/1538-4357/abc6ff
DO - 10.3847/1538-4357/abc6ff
M3 - Journal article
VL - 906
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 32
ER -
ID: 256624802