The Geometry of Cold, Metal-enriched Gas around Galaxies at z similar to 1.2
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The Geometry of Cold, Metal-enriched Gas around Galaxies at z similar to 1.2. / Lundgren, Britt F.; Creech, Samantha; Brammer, Gabriel; Kirse, Nathan; Peek, Matthew; Wake, David; York, Donald G.; Chisholm, John; Erb, Dawn K.; Kulkarni, Varsha P.; Straka, Lorrie; Tremonti, Christy; van Dokkum, Pieter.
In: Astrophysical Journal, Vol. 913, No. 1, 50, 24.05.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The Geometry of Cold, Metal-enriched Gas around Galaxies at z similar to 1.2
AU - Lundgren, Britt F.
AU - Creech, Samantha
AU - Brammer, Gabriel
AU - Kirse, Nathan
AU - Peek, Matthew
AU - Wake, David
AU - York, Donald G.
AU - Chisholm, John
AU - Erb, Dawn K.
AU - Kulkarni, Varsha P.
AU - Straka, Lorrie
AU - Tremonti, Christy
AU - van Dokkum, Pieter
PY - 2021/5/24
Y1 - 2021/5/24
N2 - We present the first results from a Hubble Space Telescope Wide Field Camera 3/Infrared program, which obtained direct imaging and grism observations of galaxies near quasar sightlines with a high frequency of uncorrelated foreground Mg ii absorption. These highly efficient observations targeted 54 Mg ii absorbers along the line of sight to nine quasars at z ((qso) similar to 2. We find that 89% of the absorbers in the range of 0.64 < z < 1.6 can be spectroscopically matched to at least one galaxy with an impact parameter of less than 200 kpc and divide Delta z divide /(1 + z) < 0.006. We have estimated the star formation rates and measured structural parameters for all detected galaxies with impact parameters in the range of 7-200 kpc and star formation rates greater than 1.3 M (circle dot) yr(-1). We find that galaxies associated with Mg ii absorption have significantly higher mean star formation rates and marginally higher mean star formation rate surface densities compared to galaxies with no detected Mg ii. Nearly half of the Mg ii absorbers match more than one galaxy, and the mean equivalent width of the Mg ii absorption is found to be greater for groups, compared to isolated galaxies. Additionally, we observe a significant redshift evolution in the physical extent of Mg ii-absorbing gas around galaxies and evidence of an enhancement of Mg ii within 50 degrees of the minor axis, characteristic of outflows, which persists to 80 kpc around the galaxies, in agreement with recent predictions from simulations.
AB - We present the first results from a Hubble Space Telescope Wide Field Camera 3/Infrared program, which obtained direct imaging and grism observations of galaxies near quasar sightlines with a high frequency of uncorrelated foreground Mg ii absorption. These highly efficient observations targeted 54 Mg ii absorbers along the line of sight to nine quasars at z ((qso) similar to 2. We find that 89% of the absorbers in the range of 0.64 < z < 1.6 can be spectroscopically matched to at least one galaxy with an impact parameter of less than 200 kpc and divide Delta z divide /(1 + z) < 0.006. We have estimated the star formation rates and measured structural parameters for all detected galaxies with impact parameters in the range of 7-200 kpc and star formation rates greater than 1.3 M (circle dot) yr(-1). We find that galaxies associated with Mg ii absorption have significantly higher mean star formation rates and marginally higher mean star formation rate surface densities compared to galaxies with no detected Mg ii. Nearly half of the Mg ii absorbers match more than one galaxy, and the mean equivalent width of the Mg ii absorption is found to be greater for groups, compared to isolated galaxies. Additionally, we observe a significant redshift evolution in the physical extent of Mg ii-absorbing gas around galaxies and evidence of an enhancement of Mg ii within 50 degrees of the minor axis, characteristic of outflows, which persists to 80 kpc around the galaxies, in agreement with recent predictions from simulations.
KW - MG II ABSORPTION
KW - DIGITAL-SKY-SURVEY
KW - STAR-FORMING GALAXIES
KW - LUMINOUS RED GALAXIES
KW - HIGH-REDSHIFT SURVEY
KW - H-ALPHA EMITTERS
KW - CIRCUMGALACTIC MEDIUM
KW - GALACTIC OUTFLOWS
KW - HALO GAS
KW - PHYSICAL-PROPERTIES
U2 - 10.3847/1538-4357/abef6a
DO - 10.3847/1538-4357/abef6a
M3 - Journal article
VL - 913
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 50
ER -
ID: 270551715