Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Vikram Khaire"'
Autor:
Ushasi Bhowmick, Vikram Khaire
Publikováno v:
The Astronomical Journal, Vol 168, Iss 6, p 243 (2024)
We present a versatile transit simulator ( Yuti ) aimed at generating light curves for arbitrarily shaped objects transiting stars. Utilizing a Monte Carlo algorithm, it accurately models the stellar flux blocked by these objects, producing precise l
Externí odkaz:
https://doaj.org/article/36b67b79cf5641a2baedafb624feba1b
Autor:
Dheerajkumar Khonde, Purvi Udhwani, Anand Narayanan, Sowgat Muzahid, Vikram Khaire, Martin Wendt
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 74 (2024)
We report on the analysis of a multiphase Lyman limit system (LLS) at z = 0.39047 identified toward the background quasar FBQS J0209–0438. The O VI doublet lines associated with this absorber have a different profile from the low-ionization metals
Externí odkaz:
https://doaj.org/article/4b10663e7331483a8405b50f2a6fcdd8
Autor:
Jane C. Charlton, Blair D. Savage, Anand Narayanan, Sriram Sankar, Benjamin Rosenwasser, Vikram Khaire, Bart P. Wakker
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 498:4864-4886
We present the analysis of five O VI absorbers identified across a redshift path of z $\sim (0.6 - 1.3)$ towards the background quasar PG $1522+101$ with information on five consecutive ionization stages of oxygen from O II to O VI. The combined $HST
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::89ab72df54636f776bd4e49d5d9694aa
https://doi.org/10.1093/mnras/staa2671
https://doi.org/10.1093/mnras/staa2671
Autor:
Teng Hu, Vikram Khaire, Joseph F Hennawi, Michael Walther, Hector Hiss, Justin Alsing, Jose Oñorbe, Zarija Lukic, Frederick Davies
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 515(2), 2188-2207
We present a new approach to measure the power-law temperature density relationship $T=T_0 (\rho / \bar{\rho})^{\gamma -1}$ and the UV background photoionization rate $\Gamma_{\rm HI}$ of the IGM based on the Voigt profile decomposition of the Ly$\al
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f29f4cd70f4e6a02413884d8c65ab105
https://ui.adsabs.harvard.edu/abs/2022MNRAS.515.2188H
https://ui.adsabs.harvard.edu/abs/2022MNRAS.515.2188H
Autor:
Zarija Lukić, Christian Rodriguez, Joseph F. Hennawi, J. Xavier Prochaska, Todd M. Tripp, Vikram Khaire, Michael Walther, Joseph N. Burchett, Jose Oñorbe
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 486:769-782
We present new measurements of the flux power-spectrum P(k) of the z < 0.5 H i Lyman-α Forest spanning scales $k \sim 0.001\!-\!0.1\, \mathrm{s \, km}^{-1}$. These results were derived from 65 far-ultraviolet quasar spectra (resolution $R \sim 18\,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::35fd1404084a04797a19ebeceed621d0
https://doi.org/10.1093/mnras/stz344
https://doi.org/10.1093/mnras/stz344
Autor:
Anshuman Acharya, Vikram Khaire
Quantitative estimates of the basic properties of the circumgalactic medium(CGM), such as its density and metallicity, depend on the spectrum of incident UV background radiation. Models of UV background are known to have large variations, mainly beca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab15d6370d395183d387125a86eb298f
http://arxiv.org/abs/2104.01182
http://arxiv.org/abs/2104.01182
Autor:
T. M. Umasree, Sameer, Sriram Sankar, Anand Narayanan, Jayadev Pradeep, Matthew Gebhardt, Jane C. Charlton, Vikram Khaire
We present the detection and analysis of a weak low-ionization absorber at $z = 0.12122$ along the blazar sightline PG~$1424+240$, using spectroscopic data from both $HST$/COS and STIS. The absorber is a weak Mg II analogue, with incidence of weak C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::614bbde522336462f91985564eb51015
http://arxiv.org/abs/2001.10558
http://arxiv.org/abs/2001.10558
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 474:2233-2258
We present a post-processing tool for GADGET-2 adiabatic simulations to model various observed properties of the Ly$\alpha$ forest at $2.5 \leq z \leq 4$ that enables an efficient parameter estimation. In particular, we model the thermal and ionizati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::65a5f0452fa834ca02462ae7dd9d1fd6
https://doi.org/10.1093/mnras/stx2859
https://doi.org/10.1093/mnras/stx2859
Autor:
Vikram Khaire
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 471:255-266
The spectrum of cosmic ultraviolet background radiation at He II ionizing energies (E > 4 Ryd) is important to study the He II reionization, thermal history of the intergalactic medium (IGM) and metal lines observed in QSO absorption spectra. It is d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c65690b9d150e5905bde280db3d02ce
https://doi.org/10.1093/mnras/stx1487
https://doi.org/10.1093/mnras/stx1487
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 467:3172-3187
We have developed a parallel code called "VoIgt profile Parameter Estimation Routine (VIPER)" for automatically fitting the H I Ly-$\alpha$ forest seen in the spectra of QSOs. We obtained the H I column density distribution function (CDDF) and line w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c5e7618738b266eb74b48c1d9969b2f3
https://doi.org/10.1093/mnras/stx248
https://doi.org/10.1093/mnras/stx248