2017A&A...597A..13V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.15CEST12:02:15

2017A&A...597A..13V - Astronomy and Astrophysics, volume 597A, 13-13 (2017/1-1)

Lyman-α spectral properties of five newly discovered Lyman continuum emitters.

VERHAMME A., ORLITOVA I., SCHAERER D., IZOTOV Y., WORSECK G., THUAN T.X. and GUSEVA N.

Abstract (from CDS):

Aims. We have recently reported the discovery of five low redshift Lyman continuum (LyC) emitters (LCEs) with absolute escape fractions fescLyC that range from 6 to 13%, higher than previously found and that more than double the number of low redshift LCEs. We use these observations to test theoretical predictions about a link between the characteristics of the Lyman-alpha (Lyα) line from galaxies and the escape of ionizing photons.
Methods. We analyse the Lyα spectra of eight LCEs of the local Universe observed with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope (our five leakers and three galaxies from the litterature), and compare their strengths and shapes to the theoretical criteria and comparison samples of local galaxies: the Lyman Alpha Reference Survey, Lyman-break analogs, Green Peas, and the high-redshift strong LyC leaker Ion2.
Results. Our LCEs are found to be strong Lyα emitters, with high equivalent widths, EW(Lyα)>70Å, and large Lyα escape fractions, fescLyα>20%. The Lyα profiles are all double-peaked with a small peak separation, in agreement with our theoretical expectations. They also have no underlying absorption at the Lyα position. All these characteristics are very different from the Lyα properties of typical star-forming galaxies of the local Universe. A subset of the comparison samples (2-3 Green Pea galaxies) share these extreme values, indicating that they could also be leaking. We also find a strong correlation between the star formation rate surface density and the escape fraction of ionizing photons, indicating that the compactness of star-forming regions plays a role in shaping low column density paths in the interstellar medium of LCEs.
Conclusions. The Lyα properties of LCEs are peculiar: Lyα can be used as a reliable tracer of LyC escape from galaxies, complementing other indirect diagnostics proposed in the literature.

Abstract Copyright: © ESO, 2016

Journal keyword(s): radiative transfer - dark ages, reionization, first stars - galaxies: ISM - ISM: structure - ISM: kinematics and dynamics - ultraviolet: galaxies

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ESO 350-38 AGN 00 36 52.489 -33 33 17.23   14.31 14.41 13.49   ~ 291 0
2 SDSS J081552.00+215623.6 EmG 08 15 51.9998642751 +21 56 23.654686991           ~ 15 0
3 SHOC 240 H2G 09 07 04.888 +53 26 56.60           ~ 24 0
4 2MASS J09215939+4509126 QSO 09 21 59.397 +45 09 12.38   18.57 18.31     ~ 49 0
5 SDSS J092532.36+140313.1 EmG 09 25 32.3641578796 +14 03 12.993552108           ~ 17 0
6 LARS 14 EmG 09 26 00.4041863336 +44 27 36.112149583           ~ 54 0
7 SDSS J115204.88+340049.8 Q? 11 52 04.8912713190 +34 00 49.896063418           ~ 13 0
8 SDSS J121903.98+152608.5 EmG 12 19 03.9837736479 +15 26 08.534277420           ~ 21 0
9 EC 12476-2317 AGN 12 50 18.90 -23 33 57.6   16.29 15.46     ~ 58 0
10 SDSS J133303.95+624603.8 H2G 13 33 03.96 +62 46 03.8           ~ 14 0
11 Mrk 1486 H2G 13 59 50.9093088961 +57 26 22.936953937   17.0       ~ 50 0
12 LEDA 1287328 G 14 14 54.1380914799 +05 40 47.631451790           ~ 8 0
13 SDSS J141612.87+122340.4 G 14 16 12.8731127520 +12 23 40.387574387           ~ 16 0
14 SDSS J142405.72+421646.3 EmG 14 24 05.7326459184 +42 16 46.261788537           ~ 14 0
15 2QZ J144231.3-020952 Q? 14 42 31.3700739287 -02 09 51.961344010   20.28       ~ 16 0
16 SDSS J150342.82+364450.7 G 15 03 42.8276869198 +36 44 50.730581493           ~ 11 0

    Equat.    Gal    SGal    Ecl

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2020.07.15-12:02:15

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