2007MNRAS.377.1222G

Query : 2007MNRAS.377.1222G

2007MNRAS.377.1222G - Mon. Not. R. Astron. Soc., 377, 1222-1228 (2007/May-3)

Abundance diagnosis of E+A (post-starburst) galaxies.

GOTO T.

Abstract (from CDS):

E+A galaxies are characterized as galaxies with strong Balmer absorption lines but without any [Oii] or Hα emission lines. The existence of strong Balmer absorption lines means that E+A galaxies have experienced a starburst within the last <1-1.5 Gyr. However, the lack of [Oii] or Hα emission lines indicates that E+A galaxies do not have any ongoing star formation. Therefore, E+A galaxies are interpreted as post-starburst galaxies. Morphologically, E+A galaxies appear as early-type galaxies, implying that E+A galaxies may be one of the progenitors of present-day elliptical galaxies. However, there remain other possibilities, such as the dusty starburst scenario, where E+A galaxies have ongoing star formation, but optical emission lines are invisible as a result of heavy obscuration by dust. Therefore, additional evidence of the post-starburst phenomenon has been eagerly awaited.

Using one of the largest samples of 451 E+A galaxies carefully selected from the Sloan Digital Sky Survey Data Release 4, here we show the abundance diagnosis of E+A galaxies using Mg and Fe lines. Our findings are as follows. (i) E+A galaxies have an enhanced α-element abundance ratio compared to star-forming galaxies with similar Balmer absorption strength. Because the truncation of strong starburst is required to enhance the α-element ratio, this is additional evidence that E+A galaxies are in the post-starburst phase. (ii) The metallicity and α-element abundance of E+A galaxies are consistent with those of elliptical galaxies, suggesting that E+A galaxies could be one of the progenitors of present-day elliptical galaxies in terms of chemical abundances.


Abstract Copyright: 2007 The Author. Journal compilation © 2007 RAS

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: interactions - galaxies: peculiar - galaxies: starburst

Simbad objects: 1

goto Full paper

goto View the references in ADS

Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 2125 ClG 15 41 14.1 +66 15 57           ~ 124 1

Query : 2007MNRAS.377.1222G

Basic data :
ACO 2125 -- Cluster of Galaxies
Other object types: otypes_help 		ClG (2019A&A,ACO,...), X (2E,1RXS)
ICRS coord. (ep=J2000) : 		15 41 14.1 +66 15 57 (X-ray) [ ] E 2008ApJ...682..821C
FK4 coord. (ep=B1950 eq=1950) : 		15 40 45.6 +66 25 28 [ ]
Gal coord. (ep=J2000) : 		101.1348 +42.9794 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 65008 [~] / z(~) 0.246500 [~] / cz 73898.84 [~]
   D 1987ApJS...63..543S
SIMBAD within arcmin
Overlay Simbad points in this preview
Back
All CDSPortal (CDSPortal)
Send to sendBySAMP sendBySAMP
sedIcon
within arcsec sed-help-icon
notes:

Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 		Display criteria :

Identifiers (9) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

ACO 2125 2E 3488 PSZRX G101.13+42.99
BAX 235.2430+66.3078 2E 1540.5+6625 1RXS J154109.5+661457
ClG 1540.5+6629 NSC J154103+661631 [F81] 331

References (124 between 1850 and 2026) (Total 124)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
Follow new references on this object
                Reference summaries :

                from: to:

                 or select by : (not exhaustive, explanation here)

Collections of Measurements Description of Measurements

Velocities : 2   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : ACO 2125

Link by name to the catalogue in VizieR :

ACO 2125 2E 3488 1RXS J154109.5+661457

Search by coordinates in Vizier (radius: 5 arcsec)

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

The annotation server is currently not available. Sorry for any inconvenience

To bookmark this query, right click on this link: simbad:objects in 2007MNRAS.377.1222G and select 'bookmark this link' or equivalent in the popup menu