TY - JOUR
T1 - A deep Hα survey of galaxies in the two nearby clusters Abell 1367 and Coma: The Hα luminosity functions
AU - Iglesias-Páramo, J.
AU - Boselli, A.
AU - Cortese, Luca
AU - Vílchez, J.M. M.
AU - Gavazzi, G.
PY - 2002
Y1 - 2002
N2 - We present a deep wide field Ha, imaging survey of the central regions of the two nearby clusters of galaxies Coma and Abell 1367, taken with the WFC at the INT 2.5 m telescope. We determine for the first time the Schechter parameters of the Ha luminosity function (LF) of cluster galaxies. The Ha LFs of Abell 1367 and Coma are compared with each other and with that of Virgo, estimated using the B band LF by Sandage et al. (1985) and a L(Ha) vs. MB relation. Typical parameters of f*˜ 100.00±0.07 Mpc-3, L* ˜ 1041.25±0.05 erg s-1 and a ˜ -0.70 ± 0.10 are found for the three clusters. The best fitting parameters of the cluster LFs differ from those found for field galaxies, showing flatter slopes and lower scaling luminosities L*. Since, however, our Ha survey is significantly deeper than those of field galaxies, this result must be confirmed on similarly deep measurements of field galaxies. By computing the total SFR per unit volume of cluster galaxies, and taking into account the cluster density in the local Universe, we estimate that the contribution of clusters like Coma and Abell 1367 is approximately 0.25% of the SFR per unit volume of the local Universe.
AB - We present a deep wide field Ha, imaging survey of the central regions of the two nearby clusters of galaxies Coma and Abell 1367, taken with the WFC at the INT 2.5 m telescope. We determine for the first time the Schechter parameters of the Ha luminosity function (LF) of cluster galaxies. The Ha LFs of Abell 1367 and Coma are compared with each other and with that of Virgo, estimated using the B band LF by Sandage et al. (1985) and a L(Ha) vs. MB relation. Typical parameters of f*˜ 100.00±0.07 Mpc-3, L* ˜ 1041.25±0.05 erg s-1 and a ˜ -0.70 ± 0.10 are found for the three clusters. The best fitting parameters of the cluster LFs differ from those found for field galaxies, showing flatter slopes and lower scaling luminosities L*. Since, however, our Ha survey is significantly deeper than those of field galaxies, this result must be confirmed on similarly deep measurements of field galaxies. By computing the total SFR per unit volume of cluster galaxies, and taking into account the cluster density in the local Universe, we estimate that the contribution of clusters like Coma and Abell 1367 is approximately 0.25% of the SFR per unit volume of the local Universe.
U2 - 10.1051/0004-6361:20011830
DO - 10.1051/0004-6361:20011830
M3 - Article
SN - 0004-6361
VL - 384
SP - 383
EP - 392
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 2
ER -