J/ApJ/742/111 Extreme emission-line galaxies in CANDELS (van der Wel+, 2011)
Extreme emission-line galaxies in CANDELS: broadband-selected, starbursting
dwarf galaxies at z > 1.
van der Wel A., Straughn A.N., Rix H.-W., Finkelstein S.L., Koekemoer A.M.,
Weiner B.J., Wuyts S., Bell E.F., Faber S.M., Trump J.R., Koo D.C.,
Ferguson H.C., Scarlata C., Hathi N.P., Dunlop J.S., Newman J.A.,
Dickinson M., Jahnke K., Salmon B.W., de Mello D.F., Kocevski D.D., Lai K.,
Grogin N.A., Rodney S.A., Guo Y., McGrath E.J., Lee K.-S., Barro G.,
Huang K.-H., Riess A.G., Ashby M.L.N., Willner S.P.
<Astrophys. J., 742, 111 (2011)>
=2011ApJ...742..111V 2011ApJ...742..111V
ADC_Keywords: Galaxies, IR ; Photometry, HST ; Equivalent widths
Keywords: galaxies: dwarf - galaxies: evolution - galaxies: formation -
galaxies: high-redshift - galaxies: starburst
Abstract:
We identify an abundant population of extreme emission-line galaxies
(EELGs) at redshift z∼1.7 in the Cosmic Assembly Near-IR Deep
Extragalactic Legacy Survey imaging from Hubble Space Telescope/Wide
Field Camera 3 (HST/WFC3). Sixty-nine EELG candidates are selected by
the large contribution of exceptionally bright emission lines to their
near-infrared broadband magnitudes. Supported by spectroscopic
confirmation of strong [OIII] emission lines - with rest-frame
equivalent widths ∼1000Å - in the four candidates that have
HST/WFC3 grism observations, we conclude that these objects are
galaxies with ∼108M☉ in stellar mass, undergoing an enormous
starburst phase with M*/(dM/dt)* of only ∼15Myr. These bursts may
cause outflows that are strong enough to produce cored dark matter
profiles in low-mass galaxies. The individual star formation rates and
the comoving number density (3.7x10-4Mpc-3) can produce in ∼4Gyr
much of the stellar mass density that is presently contained in
108-109M☉ dwarf galaxies. Therefore, our observations
provide a strong indication that many or even most of the stars in
present-day dwarf galaxies formed in strong, short-lived bursts,
mostly at z>1.
Description:
We select objects from multi-wavelength photometry of two fields with
HST/WFC3 and Advanced Camera for Surveys (ACS) coverage: the Ultra
Deep Survey (UDS) field and the GOODS-South Deep (GSD) field at
four-epoch depth. For the UDS we use WFC3 imaging in F125W (J) and
F160W (H), and ACS imaging in F814W (I) from CANDELS. For the GSD we
use the J- and H-band imaging from CANDELS, supplemented by WFC3
imaging from the Early Release Science (ERS) program (Windhorst et al.
2011ApJS..193...27W 2011ApJS..193...27W) and I-band imaging from GOODS (Giavalisco et al.
2004, Cat. II/261). The total area with I-, J-, and H-band coverage
used here is 279arcmin2. The catalog construction is described in
full by Q. Guo et al. (2011, in preparation).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 69 Sample of extreme emission-line galaxies (EELGs)
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
II/261 : GOODS initial results (Giavalisco+, 2004)
J/ApJS/203/24 : Parameters of galaxies in CANDELS (van der Wel+, 2012)
J/AJ/141/14 : HST WFC3 ERS : emission-line galaxies (Straughn+, 2011)
J/ApJ/737/71 : The [OIII] emission line in SDSS AGNs (Zhang+, 2011)
J/ApJS/192/5 : ELGs from HETDEX pilot survey (Adams+, 2011)
J/AJ/141/64 : PEARS emission-line galaxies spectroscopy (Xia+, 2011)
J/AJ/138/1022 : ELGs from HST PEARS survey (Straughn+, 2009)
J/ApJ/668/853 : Spectroscopy of UltraStrong ELGs (Kakazu+, 2007)
J/MNRAS/365/454 : Emission line analysis of HII galaxies (Hoyos+, 2006)
J/AJ/130/2584 : KISS emission-line galaxy candidates. IV (Salzer+, 2005)
http://candels.ucolick.org/ : CANDELS home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Galaxy name (<[VSR2011] GSDNN> or
<[VSR2011] UDSNN> in Simbad) (1)
7- 15 F9.6 deg RAdeg Right ascension in decimal degrees (J2000) (2)
17- 26 F10.6 deg DEdeg Declination in decimal degrees (J2000) (2)
28- 32 F5.2 mag Hmag [24.1/27.8] H-band AB magnitude from CANDELS
34- 37 F4.2 mag e_Hmag [0.03/0.3] Hmag uncertainty
39- 42 I4 0.1nm EW Equivalent width of [OIII]5007 in Å (3)
44- 46 I3 0.1nm e_EW EW uncertainty
48- 52 F5.2 --- B2500 Continuum slope at rest-frame 2500Å
(β2500) (4)
54- 57 F4.2 --- e_B2500 B2500 uncertainty
59- 62 F4.2 [Msun] logM Log of stellar mass (5)
64- 67 F4.2 [Msun] e_logM logM uncertainty
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Note (1): Identification number prefixed by the respective field acronyms:
GSD=GOODS-South Deep, UDS=Ultr-Deep Survey
Note (2): Coordinates from the Cosmic Assembly Near-IR Deep Extragalactic Legacy
Survey (CANDELS) catalogs: Grogin et al. 2011ApJS..197...35G 2011ApJS..197...35G;
Koekemoer et al. 2011ApJS..197...36K 2011ApJS..197...36K
Note (3): EW[OIII],5007: rest-frame equivalent width inferred from the I, J,
and H broadband photometry (see the text for details).
Note (4): Fλ continuum slope at rest-frame 2500Å inferred from a
linear fit to the B, V, and I broadband photometry.
Note (5): Stellar mass inferred from Starburst99 (Leitherer et al.
1999ApJS..123....3L 1999ApJS..123....3L); see Figure 1 in section 2.2 and section 4.2.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 22-Apr-2013