The MOSDEF survey: a new view of a remarkable z=1.89 merger
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The MOSDEF survey : a new view of a remarkable z=1.89 merger. / Runco, Jordan N.; Shapley, Alice E.; Kriek, Mariska; Cappellari, Michele; Topping, Michael W.; Sanders, Ryan L.; Kokorev, Vasily; Price, Sedona H.; Reddy, Naveen A.; Coil, Alison L.; Mobasher, Bahram; Siana, Brian; Zick, Tom; Magdis, Georgios E.; Brammer, Gabriel; Aird, James.
In: Monthly Notices of the Royal Astronomical Society, Vol. 517, No. 3, 02.11.2022, p. 4405-4416.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The MOSDEF survey
T2 - a new view of a remarkable z=1.89 merger
AU - Runco, Jordan N.
AU - Shapley, Alice E.
AU - Kriek, Mariska
AU - Cappellari, Michele
AU - Topping, Michael W.
AU - Sanders, Ryan L.
AU - Kokorev, Vasily
AU - Price, Sedona H.
AU - Reddy, Naveen A.
AU - Coil, Alison L.
AU - Mobasher, Bahram
AU - Siana, Brian
AU - Zick, Tom
AU - Magdis, Georgios E.
AU - Brammer, Gabriel
AU - Aird, James
PY - 2022/11/2
Y1 - 2022/11/2
N2 - We present a detailed study of a galaxy merger taking place at z = 1.89 in the GOODS-S field. Here, we analyse Keck/MOSFIRE spectroscopic observations from the MOSFIRE Deep Evolution Field (MOSDEF) survey along with multiwavelength photometry assembled by the 3D-HST survey. The combined data set is modelled to infer the past star formation histories (SFHs) of both merging galaxies. They are found to be massive, with log(10) (M-*/M-circle dot) > 11, with a close mass ratio satisfying the typical major-merger definition. Additionally, in the context of delayed-r models, GOODS-S 43114, and GOODS-S 43683 have similar SFHs and low star formation rates (log (10)(SFR(SED)/M-circle dot yr(-1)) < 1.0) compared to their past averages. The best-fitting model SEDs show elevated H delta(A) values for both galaxies, indicating that their stellar spectra are dominated by A-type stars, and that star formation peaked similar to 0.5-1 Gyr ago and has recently declined. Additionally, based on SED fitting both merging galaxies turned on and shut off star formation within a few hundred Myr of each other, suggesting that their bursts of star formation may be linked. Combining the SFI Is and H delta(A) results with recent galaxy merger simulations, we infer that these galaxies have recently completed their first pericentric passage and are moving apart. Finally, the relatively low second velocity moment of GOODS-S 43114, given its stellar mass suggests a disc-like structure. However, including the geometry of the galaxy in the modelling does not completely resolve the discrepancy between the dynamical and stellar masses. Future work is needed to resolve this inconsistency in mass.
AB - We present a detailed study of a galaxy merger taking place at z = 1.89 in the GOODS-S field. Here, we analyse Keck/MOSFIRE spectroscopic observations from the MOSFIRE Deep Evolution Field (MOSDEF) survey along with multiwavelength photometry assembled by the 3D-HST survey. The combined data set is modelled to infer the past star formation histories (SFHs) of both merging galaxies. They are found to be massive, with log(10) (M-*/M-circle dot) > 11, with a close mass ratio satisfying the typical major-merger definition. Additionally, in the context of delayed-r models, GOODS-S 43114, and GOODS-S 43683 have similar SFHs and low star formation rates (log (10)(SFR(SED)/M-circle dot yr(-1)) < 1.0) compared to their past averages. The best-fitting model SEDs show elevated H delta(A) values for both galaxies, indicating that their stellar spectra are dominated by A-type stars, and that star formation peaked similar to 0.5-1 Gyr ago and has recently declined. Additionally, based on SED fitting both merging galaxies turned on and shut off star formation within a few hundred Myr of each other, suggesting that their bursts of star formation may be linked. Combining the SFI Is and H delta(A) results with recent galaxy merger simulations, we infer that these galaxies have recently completed their first pericentric passage and are moving apart. Finally, the relatively low second velocity moment of GOODS-S 43114, given its stellar mass suggests a disc-like structure. However, including the geometry of the galaxy in the modelling does not completely resolve the discrepancy between the dynamical and stellar masses. Future work is needed to resolve this inconsistency in mass.
KW - galaxies: evolution
KW - galaxies: high-redshift
KW - galaxies: interactions
KW - DIGITAL SKY SURVEY
KW - STELLAR POPULATION SYNTHESIS
KW - TO-LIGHT RATIO
KW - INFRARED SPECTROSCOPIC SURVEY
KW - SUPERMASSIVE BLACK-HOLES
KW - ENHANCED STAR-FORMATION
KW - K-SELECTED GALAXIES
KW - DEEP-FIELD-SOUTH
KW - QUIESCENT GALAXIES
KW - STARBURST GALAXIES
U2 - 10.1093/mnras/stac2863
DO - 10.1093/mnras/stac2863
M3 - Journal article
VL - 517
SP - 4405
EP - 4416
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 325826476