Sunday. Let's see if I can get any reading done today.
1207.2614
A star-bursting proto-cluster in making associated to a radio galaxy at z=2.53 discovered by H_alpha imaging
Hayashi et al
As the title says. There are 68 Ha emitters with dust-uncorrected SFRs down to 8 Msun/yr; making up 3 prominent clumps of Halpha emitters, one surrounding the radio galaxy, and another located at 1.5 Mpc away, and the other located in between the two; may merger in the future. Most Ha emitters are in the blue cloud, but some have try red colors (J-Ks>1.38); just red Ha emitters are located towards the faint end of the red sequence, and located in the high density clumps [are they star forming, or in the middle of being quenched? It's already quenched because it's red (no SF), but it's still emitting Ha--electron can bind itself to a proton to make neutral H. Whether you see Halpha is temperature dependent--it must be, if you don't see Ha in ellipticals or clusters with warm or hot gas.]
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