TY - JOUR
T1 - SALT spectroscopic observations of galaxy clusters detected by ACT and a type II quasar hosted by a brightest cluster galaxy
AU - Kirk, Brian
AU - Hilton, Matt
AU - Cress, Catherine
AU - Crawford, Steven M.
AU - Hughes, John P.
AU - Battaglia, Nicholas
AU - Richard Bond, J.
AU - Burke, Claire
AU - Gralla, Megan B.
AU - Hajian, Amir
AU - Hasselfield, Matthew
AU - Hincks, Adam D.
AU - Infante, Leopoldo
AU - Kosowsky, Arthur
AU - Marriage, Tobias A.
AU - Menanteau, Felipe
AU - Moodley, Kavilan
AU - Niemack, Michael D.
AU - Sievers, Jonathan L.
AU - Sifón, Cristóbal
AU - Wilson, Susan
AU - Wollack, Edward J.
AU - Zunckel, Caroline
N1 - Publisher Copyright:
© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
PY - 2015/3/21
Y1 - 2015/3/21
N2 - We present SouthernAfrican Large Telescope follow-up observations of sevenmassive clusters detected by the Atacama Cosmology Telescope (ACT) on the celestial equator using the Sunyaev-Zel'dovich (SZ) effect. We conducted multi-object spectroscopic observations with the Robert Stobie Spectrograph in order to measure galaxy redshifts in each cluster field, determine the cluster line-of-sight velocity dispersions, and infer the cluster dynamical masses. We find that the clusters, which span the redshift range 0.3 < z < 0.55, range in mass from (5-20) × 1014 M⊙ (M200c). Their masses, given their SZ signals, are similar to those of Southern hemisphere ACT clusters previously observed using Gemini and the VLT. We note that the brightest cluster galaxy in one of the systems studied, ACT-CL J0320.4+0032 at z = 0.38, hosts a type II quasar. Only a handful of such systems are currently known, and therefore ACT-CL J0320.4+0032 may be a rare example of a very massive halo in which quasar-mode feedback is actively taking place.
AB - We present SouthernAfrican Large Telescope follow-up observations of sevenmassive clusters detected by the Atacama Cosmology Telescope (ACT) on the celestial equator using the Sunyaev-Zel'dovich (SZ) effect. We conducted multi-object spectroscopic observations with the Robert Stobie Spectrograph in order to measure galaxy redshifts in each cluster field, determine the cluster line-of-sight velocity dispersions, and infer the cluster dynamical masses. We find that the clusters, which span the redshift range 0.3 < z < 0.55, range in mass from (5-20) × 1014 M⊙ (M200c). Their masses, given their SZ signals, are similar to those of Southern hemisphere ACT clusters previously observed using Gemini and the VLT. We note that the brightest cluster galaxy in one of the systems studied, ACT-CL J0320.4+0032 at z = 0.38, hosts a type II quasar. Only a handful of such systems are currently known, and therefore ACT-CL J0320.4+0032 may be a rare example of a very massive halo in which quasar-mode feedback is actively taking place.
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U2 - 10.1093/mnras/stv595
DO - 10.1093/mnras/stv595
M3 - Article
AN - SCOPUS:84930012618
SN - 0035-8711
VL - 449
SP - 4010
EP - 4026
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -