A double-peaked Lyman-alpha emitter with a stronger blue peak multiply imaged by the galaxy cluster RXC J0018.5+1626
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A double-peaked Lyman-alpha emitter with a stronger blue peak multiply imaged by the galaxy cluster RXC J0018.5+1626. / Furtak, Lukas J.; Plat, Adele; Zitrin, Adi; Topping, Micheal W.; Stark, Daniel P.; Strait, Victoria; Charlot, Stephane; Coe, Dan; Andrade-Santos, Felipe; Bradac, Marusa; Bradley, Larry; Lemaux, Brian C.; Sharon, Keren.
In: Monthly Notices of the Royal Astronomical Society, Vol. 516, No. 1, 05.09.2022, p. 1373-1385.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - A double-peaked Lyman-alpha emitter with a stronger blue peak multiply imaged by the galaxy cluster RXC J0018.5+1626
AU - Furtak, Lukas J.
AU - Plat, Adele
AU - Zitrin, Adi
AU - Topping, Micheal W.
AU - Stark, Daniel P.
AU - Strait, Victoria
AU - Charlot, Stephane
AU - Coe, Dan
AU - Andrade-Santos, Felipe
AU - Bradac, Marusa
AU - Bradley, Larry
AU - Lemaux, Brian C.
AU - Sharon, Keren
PY - 2022/9/5
Y1 - 2022/9/5
N2 - We report the discovery of a double-peaked Lyman-alpha (Ly alpha) emitter (LAE) at z = 3.2177 +/- 0.0001 in VLT/MUSE data. The galaxy is strongly lensed by the galaxy cluster RXC J0018.5+1626 recently observed in the RELICS survey, and the double-peaked Ly a emission is clearly detected in the two counter images in the MUSE field of view. We measure a relatively high Ly alpha rest-frame equivalent width (EW) of EWLy alpha, 0 = (63 +/- 2) angstrom. Additional spectroscopy with Gemini/GNIRS in the near-infrared (NIR) allows us to measure the H beta, [O III] lambda 4959 angstrom, and [O III] lambda 5007 angstrom emission lines, which show moderate rest-frame EWs of the order of a few similar to 10-100 angstrom, an [O III] lambda 5007 angstrom/H beta ratio of 4.8 +/- 0.7, and a lower limit on the [O III]/[O II] ratio of >9.3. The galaxy has very blue UV-continuum slopes of beta(FUV) = -2.23 +/- 0.06 and beta(NUV) = -3.0 +/- 0.2, and is magnified by factors mu similar to 7-10 in each of the two images, thus enabling a view into a low-mass (M-* similar or equal to 10(7.5) M-circle dot) high-redshift galaxy analogue. Notably, the blue peak of the Ly alpha profile is significantly stronger than the red peak, which suggests an inflow of matter and possibly very low H I column densities in its circumgalactic gas. To the best of our knowledge, this is the first detection of such a Ly alpha profile. Combined with the high lensing magnification and image multiplicity, these properties make this galaxy a prime candidate for follow-up observations to search for LyC emission and constrain the LyC photon escape fraction.
AB - We report the discovery of a double-peaked Lyman-alpha (Ly alpha) emitter (LAE) at z = 3.2177 +/- 0.0001 in VLT/MUSE data. The galaxy is strongly lensed by the galaxy cluster RXC J0018.5+1626 recently observed in the RELICS survey, and the double-peaked Ly a emission is clearly detected in the two counter images in the MUSE field of view. We measure a relatively high Ly alpha rest-frame equivalent width (EW) of EWLy alpha, 0 = (63 +/- 2) angstrom. Additional spectroscopy with Gemini/GNIRS in the near-infrared (NIR) allows us to measure the H beta, [O III] lambda 4959 angstrom, and [O III] lambda 5007 angstrom emission lines, which show moderate rest-frame EWs of the order of a few similar to 10-100 angstrom, an [O III] lambda 5007 angstrom/H beta ratio of 4.8 +/- 0.7, and a lower limit on the [O III]/[O II] ratio of >9.3. The galaxy has very blue UV-continuum slopes of beta(FUV) = -2.23 +/- 0.06 and beta(NUV) = -3.0 +/- 0.2, and is magnified by factors mu similar to 7-10 in each of the two images, thus enabling a view into a low-mass (M-* similar or equal to 10(7.5) M-circle dot) high-redshift galaxy analogue. Notably, the blue peak of the Ly alpha profile is significantly stronger than the red peak, which suggests an inflow of matter and possibly very low H I column densities in its circumgalactic gas. To the best of our knowledge, this is the first detection of such a Ly alpha profile. Combined with the high lensing magnification and image multiplicity, these properties make this galaxy a prime candidate for follow-up observations to search for LyC emission and constrain the LyC photon escape fraction.
KW - gravitational lensing: strong
KW - ISM: lines and bands
KW - galaxies: clusters: individual: RXC J0018.5+1626
KW - galaxies: evolution
KW - galaxies: star formation
KW - dark ages, reionization, first stars
KW - ULTRA-DEEP FIELD
KW - EMISSION-LINE GALAXIES
KW - STAR-FORMING GALAXIES
KW - CONTINUUM ESCAPE FRACTION
KW - STRONG-LENSING ANALYSIS
KW - O III EMITTERS
KW - SIMILAR-TO 2
KW - COSMIC REIONIZATION
KW - LUMINOSITY FUNCTION
KW - RADIATIVE-TRANSFER
U2 - 10.1093/mnras/stac2169
DO - 10.1093/mnras/stac2169
M3 - Journal article
VL - 516
SP - 1373
EP - 1385
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
ER -
ID: 319117326