2015ApJ...804..125L


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST20:35:33

2015ApJ...804..125L - Astrophys. J., 804, 125 (2015/May-2)

P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death.

LI C., WANG E., LIN L., BERSHADY M.A., BUNDY K., TREMONTI C.A., XIAO T., YAN R., BIZYAEV D., BLANTON M., CALES S., CHERINKA B., CHEUNG E., DRORY N., EMSELLEM E., FU H., GELFAND J., LAW D.R., LIN L., MacDONALD N., MARASTON C., MASTERS K.L., MERRIFIELD M.R., PAN K., SANCHEZ S.F., SCHNEIDER D.P., THOMAS D., WAKE D., WANG L., WEIJMANS A.-M., WILKINSON D., YOACHIM P., ZHANG K. and ZHENG T.

Abstract (from CDS):

We present an analysis of the data produced by the MaNGA prototype run (P-MaNGA), aiming to test how the radial gradients in recent star formation histories, as indicated by the 4000 Å break (Dn(4000)), Hδ absorption (EW(HδA)), and Hα emission (EW(Hα)) indices, can be useful for understanding disk growth and star formation cessation in local galaxies. We classify 12 galaxies observed on two P-MaNGA plates as either centrally quiescent (CQ) or centrally star-forming (CSF), according to whether Dn(4000) measured in the central spaxel of each datacube exceeds 1.6. For each spaxel we generate both 2D maps and radial profiles of Dn(4000), EW(HδA), and EW(Hα). We find that CSF galaxies generally show very weak or no radial variation in these diagnostics. In contrast, CQ galaxies present significant radial gradients, in the sense that Dn(4000) decreases, while both EW(HδA) and EW(Hα) increase from the galactic center outward. The outer regions of the galaxies show greater scatter on diagrams relating the three parameters than their central parts. In particular, the clear separation between centrally measured quiescent and star-forming galaxies in these diagnostic planes is largely filled in by the outer parts of galaxies whose global colors place them in the green valley, supporting the idea that the green valley represents a transition between blue-cloud and red-sequence phases, at least in our small sample. These results are consistent with a picture in which the cessation of star formation propagates from the center of a galaxy outward as it moves to the red sequence.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: general - galaxies: stellar content - methods: observational - surveys

Nomenclature: Table 1, col(3): MaNGA N-NNNNNN N=12.

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15356 1
2 2MASX J09310908+2055012 G 09 31 09.0721897791 +20 55 00.625016568   15.6       ~ 10 0
3 2MASX J09310959+2244472 G 09 31 09.6093989752 +22 44 47.437417510   15.7       ~ 9 0
4 NGC 2916 Sy2 09 34 57.5939750994 +21 42 18.947459809 12.81 12.74 12.05     ~ 130 1
5 2MFGC 7424 G 09 35 06.313 +21 37 39.89   15.6       ~ 13 0
6 UGC 5124 G 09 37 11.8177055056 +21 40 09.335258400   15.7       ~ 19 0
7 2MASS J09403025+2115136 G 09 40 30.253 +21 15 13.61           ~ 7 0
8 2MASX J10495872+3624543 G 10 49 58.698 +36 24 54.03   16.5       ~ 11 0
9 MCG+06-24-030 LIN 10 52 59.0533397810 +37 36 48.299211971   15.1       ~ 16 0
10 UGC 6036 LIN 10 55 55.2563271579 +36 51 41.512433039   14.6       ~ 44 0
11 2MASS J10560566+3657360 G 10 56 05.6788845621 +36 57 36.180601931           ~ 7 0
12 2MASX J10574661+3616582 G 10 57 46.620 +36 16 57.89           ~ 7 0
13 2MASX J11001209+3623137 G 11 00 12.109 +36 23 13.87           ~ 7 0
14 NAME Local Group GrG ~ ~           ~ 7264 0

    Equat.    Gal    SGal    Ecl

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