Ramesh Mainali
University of Arizona
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Featured researches published by Ramesh Mainali.
Monthly Notices of the Royal Astronomical Society | 2017
Daniel P. Stark; Richard S. Ellis; S. Charlot; Jacopo Chevallard; Mengtao Tang; Sirio Belli; Adi Zitrin; Ramesh Mainali; Julia Gutkin; Alba Vidal-García; R. J. Bouwens; P. A. Oesch
We discuss new Keck/MOSFIRE spectroscopic observations of four luminous galaxies at z ≃ 7–9 selected to have intense optical line emission by Roberts-Borsani et al. Previous follow-up has revealed Lyα in two of the four galaxies. Our new MOSFIRE observations confirm that Lyα is present in the entire sample. We detect Lyα emission in the galaxy COS-zs7-1, confirming its redshift as zLyα = 7.154, and we detect Lyα in EGS-zs8-2 at zLyα = 7.477, verifying an earlier tentative detection. The ubiquity of Lyα in this sample is puzzling given that the IGM is expected to be significantly neutral over 7 7 is expected to be strongly luminosity-dependent, with transmission accelerated in systems with intense star formation.
Monthly Notices of the Royal Astronomical Society | 2015
Daniel P. Stark; Gregory Walth; S. Charlot; Benjamin Clément; Anna Feltre; Julia Gutkin; Johan Richard; Ramesh Mainali; Brant Robertson; Brian Siana; Mengtao Tang; Matthew A. Schenker
We present Keck/MOSFIRE observations of UV metal lines in four bright gravitationally-lensed z~6-8 galaxies behind the cluster Abell 1703. The spectrum of A1703-zd6, a highly-magnified star forming galaxy with a Lyman-alpha redshift of z=7.045, reveals a confident detection of the nebular CIV emission line (unresolved with FWHM 7, it would indicate that reionization-era galaxies are more efficient ionizing agents than previously thought. Alternatively, we suggest that the small sample of Lyman-alpha emitters at z>7 may trace a rare population with intense radiation fields capable of ionizing their surrounding hydrogen distribution. Additional constraints on high ionization emission lines in galaxies with and without Lyman-alpha detections will help clarify whether hard ionizing spectra are common in the reionization era.
Monthly Notices of the Royal Astronomical Society | 2017
Peter Senchyna; Daniel P. Stark; Alba Vidal-García; Jacopo Chevallard; S. Charlot; Ramesh Mainali; Tucker Jones; Aida Wofford; Anna Feltre; Julia Gutkin
NASA through Space Telescope Science Institute [14168]; NASA [NAS 5-26555]; W.M. Keck Foundation; National Science Foundation [AST-1410155]; European Research Council [321323-NEOGAL]; NASA through Hubble Fellowship - Space Telescope Science Institute [HST-HF2-51359.001-A]; ERC [339659-MUSICOS]
The Astrophysical Journal | 2017
N. Laporte; Kimihiko Nakajima; Richard S. Ellis; Adi Zitrin; Daniel P. Stark; Ramesh Mainali; G. W. Roberts-Borsani
The ubiquity of Lyman alpha (Ly
The Astrophysical Journal | 2017
Ramesh Mainali; Juna A. Kollmeier; Daniel P. Stark; Robert A. Simcoe; Gregory Walth; Andrew B. Newman; Daniel Robert Miller
\alpha
The Astrophysical Journal | 2018
Catherine Cerny; Keren Sharon; Felipe Andrade-Santos; Roberto J. Avila; Maruša Bradač; L. Bradley; Daniela Carrasco; Dan Coe; Nicole G. Czakon; William A. Dawson; Brenda L. Frye; Austin Hoag; Kuang-Han Huang; Traci L. Johnson; Christine Jones; Daniel Lam; Lorenzo Lovisari; Ramesh Mainali; Pascal A. Oesch; Sara Ogaz; Matthew Past; Rachel Paterno-Mahler; Avery Peterson; Adam G. Riess; Steven A. Rodney; Russell E. Ryan; Brett Salmon; Irene Sendra-Server; Daniel P. Stark; Louis-Gregory Strolger
) emission in a sample of four bright [O III]-strong star-forming galaxies with redshifts above 7 has led to the suggestion that such luminous sources represent a distinct population compared to their fainter, more numerous, counterparts. The presence of Ly
The Astrophysical Journal | 2018
Nathália Cibirka; Ana Acebron; Adi Zitrin; Dan Coe; I. Agulli; Felipe Andrade-Santos; Maruša Bradač; Brenda L. Frye; Rachael Livermore; Guillaume Mahler; Brett Salmon; Keren Sharon; Michele Trenti; Keiichi Umetsu; Roberto J. Avila; L. Bradley; Daniela Carrasco; Catherine Cerny; Nicole G. Czakon; William A. Dawson; Austin Hoag; Kuang-Han Huang; Traci L. Johnson; Christine Jones; Shotaro Kikuchihara; Daniel Lam; Lorenzo Lovisari; Ramesh Mainali; Pascal A. Oesch; Sara Ogaz
\alpha
The Astrophysical Journal | 2018
Ana Acebron; Nathália Cibirka; Adi Zitrin; Dan Coe; I. Agulli; Keren Sharon; Maruša Bradač; Brenda L. Frye; Rachael Livermore; Guillaume Mahler; Brett Salmon; Keiichi Umetsu; L. Bradley; Felipe Andrade-Santos; Roberto J. Avila; Daniela Carrasco; Catherine Cerny; Nicole G. Czakon; William A. Dawson; Austin Hoag; Kuang-Han Huang; Traci L. Johnson; Christine Jones; Shotaro Kikuchihara; Daniel Lam; Lorenzo Lovisari; Ramesh Mainali; Pascal A. Oesch; Sara Ogaz; Masami Ouchi
emission within the reionization era could indicate that these sources created early ionized bubbles due to their unusually strong radiation, possibly due to the presence of active galactic nuclei. To test this hypothesis we have secured long integration spectra with XSHOOTER on the VLT for three
Monthly Notices of the Royal Astronomical Society | 2018
Ramesh Mainali; Adi Zitrin; Daniel P. Stark; Richard S. Ellis; Johan Richard; Mengtao Tang; N. Laporte; Pascal A. Oesch; Ian D. McGreer
z\simeq
The Astrophysical Journal | 2018
Brett Salmon; Dan Coe; L. Bradley; Maruša Bradač; Victoria Strait; Rachel Paterno-Mahler; Kuang-Han Huang; Pascal A. Oesch; Adi Zitrin; Ana Acebron; Nathália Cibirka; Shotaro Kikuchihara; Masamune Oguri; Gabriel B. Brammer; Keren Sharon; Michele Trenti; Roberto J. Avila; Sara Ogaz; Felipe Andrade-Santos; Daniela Carrasco; Catherine Cerny; William A. Dawson; Brenda Frye; Austin Hoag; Christine Jones; Ramesh Mainali; Masami Ouchi; Steven A. Rodney; Daniel P. Stark; Keiichi Umetsu
7 sources selected to have similar luminosities and prominent excess fluxes in the IRAC 3.6 or 4.5
