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Can nebular He II emission be explained by ultra-luminous X-ray sources?

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Astronomy & Astrophysics 656 A127 (2021)
https://doi.org/10.1051/0004-6361/202141856

A Sample of Massive Black Holes in Dwarf Galaxies Detected via [Fe x] Coronal Line Emission: Active Galactic Nuclei and/or Tidal Disruption Events

Mallory Molina, Amy E. Reines, Lilikoi Latimer, Vivienne Baldassare and Sheyda Salehirad
The Astrophysical Journal 922 (2) 155 (2021)
https://doi.org/10.3847/1538-4357/ac1ffa

Spectral Signatures of Population iii and Envelope-stripped Stars in Galaxies at the Epoch of Reionization

Elizabeth Berzin, Amy Secunda, Renyue Cen, Alexander Menegas and Ylva Götberg
The Astrophysical Journal 918 (1) 5 (2021)
https://doi.org/10.3847/1538-4357/ac0af6

Metal-THINGS: On the Metallicity and Ionization of ULX Sources in NGC 925

Maritza A. Lara-López, Igor A. Zinchenko, Leonid S. Pilyugin, Madusha L. P. Gunawardhana, Omar López-Cruz, Shane P. O’Sullivan, Anna Feltre, Margarita Rosado, Mónica Sánchez-Cruces, Jacopo Chevallard, Maria Emilia De Rossi, Sami Dib, Jacopo Fritz, Isaura Fuentes-Carrera, Luis E. Garduño and Eduardo Ibar
The Astrophysical Journal 906 (1) 42 (2021)
https://doi.org/10.3847/1538-4357/abc892

Wolf–Rayet stars in the Antennae unveiled by MUSE

V M A Gómez-González, Y D Mayya, J A Toalá, et al.
Monthly Notices of the Royal Astronomical Society 500 (2) 2076 (2020)
https://doi.org/10.1093/mnras/staa3304

MEGARA-IFU detection of extended He ii λ4686 nebular emission in the central region of NGC 1569 and its ionization budget

Y D Mayya, E Carrasco, V M A Gómez-González, et al.
Monthly Notices of the Royal Astronomical Society 498 (1) 1496 (2020)
https://doi.org/10.1093/mnras/staa2335

Chandra reveals a luminous Compton-thick QSO powering a Lyα blob in a z = 4 starbursting protocluster

F. Vito, W. N. Brandt, B. D. Lehmer, et al.
Astronomy & Astrophysics 642 A149 (2020)
https://doi.org/10.1051/0004-6361/202038848

Chemodynamics of green pea galaxies – I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment

R Chávez, A Jaskot, V Firpo, et al.
Monthly Notices of the Royal Astronomical Society 494 (3) 3541 (2020)
https://doi.org/10.1093/mnras/staa851

Reconstructing the Observed Ionizing Photon Production Efficiency at z ∼ 2 Using Stellar Population Models

Themiya Nanayakkara, Jarle Brinchmann, Karl Glazebrook, Rychard Bouwens, Lisa Kewley, Kim-Vy Tran, Michael Cowley, Deanne Fisher, Glenn G. Kacprzak, Ivo Labbe and Caroline Straatman
The Astrophysical Journal 889 (2) 180 (2020)
https://doi.org/10.3847/1538-4357/ab65eb

On the AGN Nature of Two UV-bright Sources at zspec ∼ 5.5 in the CANDELS Fields: An Update on the AGN Space Density at M1450 ∼ −22.5

A. Grazian, E. Giallongo, F. Fiore, K. Boutsia, F. Civano, S. Cristiani, G. Cupani, M. Dickinson, F. Fontanot, N. Menci and M. Romano
The Astrophysical Journal 897 (1) 94 (2020)
https://doi.org/10.3847/1538-4357/ab99a3

The properties of He IIλ1640 emitters at z ∼  2.5–5 from the VANDELS survey

A. Saxena, L. Pentericci, M. Mirabelli, et al.
Astronomy & Astrophysics 636 A47 (2020)
https://doi.org/10.1051/0004-6361/201937170

X-ray properties of He ii λ 1640 emitting galaxies in VANDELS

G Zamorani, M Talia, D J McLeod, et al.
Monthly Notices of the Royal Astronomical Society 496 (3) 3796 (2020)
https://doi.org/10.1093/mnras/staa1805

Delayed Photons from Binary Evolution Help Reionize the Universe

Amy Secunda, Renyue Cen, Taysun Kimm, Ylva Götberg and Selma E. de Mink
The Astrophysical Journal 901 (1) 72 (2020)
https://doi.org/10.3847/1538-4357/abaefa

High-mass X-ray binaries in nearby metal-poor galaxies: on the contribution to nebular He ii emission

Peter Senchyna, Daniel P Stark, Jordan Mirocha, et al.
Monthly Notices of the Royal Astronomical Society 494 (1) 941 (2020)
https://doi.org/10.1093/mnras/staa586

The impact of star formation sampling effects on the spectra of lensed z > 6 galaxies detectable with JWST

Anton Vikaeus, Erik Zackrisson and Christian Binggeli
Monthly Notices of the Royal Astronomical Society 492 (2) 1706 (2020)
https://doi.org/10.1093/mnras/stz3523

Properties of five z ∼ 0.3–0.4 confirmed LyC leakers: VLT/XShooter observations

N G Guseva, Y I Izotov, D Schaerer, et al.
Monthly Notices of the Royal Astronomical Society 497 (4) 4293 (2020)
https://doi.org/10.1093/mnras/staa2197

Contribution from stars stripped in binaries to cosmic reionization of hydrogen and helium

Y. Götberg, S. E. de Mink, M. McQuinn, et al.
Astronomy & Astrophysics 634 A134 (2020)
https://doi.org/10.1051/0004-6361/201936669

Intense C iv and He ii Emission in z ∼ 0 Galaxies: Probing High-energy Ionizing Photons∗

Danielle A. Berg, John Chisholm, Dawn K. Erb, Richard Pogge, Alaina Henry and Grace M. Olivier
The Astrophysical Journal Letters 878 (1) L3 (2019)
https://doi.org/10.3847/2041-8213/ab21dc

Synthetic nebular emission from massive galaxies – II. Ultraviolet-line diagnostics of dominant ionizing sources

Michaela Hirschmann, Stephane Charlot, Anna Feltre, et al.
Monthly Notices of the Royal Astronomical Society 487 (1) 333 (2019)
https://doi.org/10.1093/mnras/stz1256

The VANDELS survey: the role of ISM and galaxy physical properties in the escape of Lyα emission in z ∼ 3.5 star-forming galaxies

F. Marchi, L. Pentericci, L. Guaita, et al.
Astronomy & Astrophysics 631 A19 (2019)
https://doi.org/10.1051/0004-6361/201935495

The impact of stars stripped in binaries on the integrated spectra of stellar populations

Y. Götberg, S. E. de Mink, J. H. Groh, C. Leitherer and C. Norman
Astronomy & Astrophysics 629 A134 (2019)
https://doi.org/10.1051/0004-6361/201834525

Exploring He II λ1640 emission line properties at z ∼2−4

Themiya Nanayakkara, Jarle Brinchmann, Leindert Boogaard, et al.
Astronomy & Astrophysics 624 A89 (2019)
https://doi.org/10.1051/0004-6361/201834565

Constraints on the production and escape of ionizing radiation from the emission-line spectra of metal-poor star-forming galaxies

A Plat, S Charlot, G Bruzual, et al.
Monthly Notices of the Royal Astronomical Society 490 (1) 978 (2019)
https://doi.org/10.1093/mnras/stz2616

Extremely metal-poor galaxies with HST/COS: laboratories for models of low-metallicity massive stars and high-redshift galaxies

Alba Vidal-García, Tucker Jones, Stéphane Charlot, et al.
Monthly Notices of the Royal Astronomical Society 488 (3) 3492 (2019)
https://doi.org/10.1093/mnras/stz1907

Constraining the Metallicities, Ages, Star Formation Histories, and Ionizing Continua of Extragalactic Massive Star Populations∗

J. Chisholm, J. R. Rigby, M. Bayliss, D. A. Berg, H. Dahle, M. Gladders and K. Sharon
The Astrophysical Journal 882 (2) 182 (2019)
https://doi.org/10.3847/1538-4357/ab3104

ULX contribution to stellar feedback: an intermediate-mass black hole candidate and the population of ULXs in the low-metallicity starburst galaxy ESO 338-4

L. M. Oskinova, A. Bik, J. M. Mas-Hesse, et al.
Astronomy & Astrophysics 627 A63 (2019)
https://doi.org/10.1051/0004-6361/201935414

He ii Emission from Wolf–Rayet Stars as a Tool for Measuring Dust Reddening

Claus Leitherer, Janice C. Lee and Andreas Faisst
The Astronomical Journal 158 (5) 192 (2019)
https://doi.org/10.3847/1538-3881/ab44c0