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    Wyświetlanie 1-5 z 5
    Tytuł:
    Viewing angle observations and effects of evolution with redshift, black hole mass, and Eddington ratio in quasar-based cosmology
    Autorzy:
    Pollo, Agnieszka
    Panda, Swayamtrupta
    Czerny, Bożena
    Prince, Raj
    Hryniewicz, Krzysztof
    Opis:
    This study is focused on the observational measurement of the viewing angle of individual quasars by modeling the broadband quasar spectrum ranging from the IR to soft X-ray band. Sources are selected from various published catalogs, and their broadband quasi-simultaneous spectral data points were collected and used for modeling. We started with a COSMOS sample of Type-1 sources that have broadband photometric points. To include more data points, we cross-matched the COSMOS with the Sloan Digital Sky Survey Data Release 14 quasar catalog, and eventually we find 90 sources which have broadband data ranging from IR to soft X-ray. The broadband spectral energy distribution modeling is done in Xspec by using the optxagnf and the SKIRTOR models for the X-ray, UV, optical, and IR regimes for each source. The whole sample is divided into four bins with respect to redshift, black hole (BH) mass, and Eddington ratio with an equal number of sources in each bin. The viewing angle is estimated in each bin, and its evolution with respect to redshift, BH mass, and Eddington ratio is examined. In result, we did not find any significant evolution of viewing angle with those parameters within the 95% confidence interval. We conclude that the use of quasars in cosmology to determine the expansion rate of the universe is therefore justified, and biases are not expected.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    Wavelength-resolved reverberation mapping of quasar CTS C30.10 : dissecting Mg II and Fe II emission regions
    Autorzy:
    Martinez-Aldama, Mary Loli
    Sobrino Figaredo, Catalina
    Hryniewicz, Krzysztof
    Zajaček, Michal
    Worters, Hannah L.
    Udalski, Andrzej
    Przyłuski, Robert
    Czerny, Bożena
    Kumar Jaiswal, Vikram
    Haas, Martin
    Trzcionkowski, Piotr
    Olejak, Aleksandra
    Rałowski, Mateusz
    Panda, Swayamtrupta
    Prince, Raj
    Śniegowska, Marzena
    Genade, Anja
    Karas, Vladimir
    Naddaf, Mohammad-Hassan
    Sefako, Ramotholo R.
    Jacek Sarna, Marek
    Bilicki, Maciej
    Bronikowski, Mateusz
    Opis:
    Context. We present the results of the reverberation monitoring of the Mg II broad line and Fe II pseudocontinuum for the luminous quasar CTS C30.10 (z = 0.90052) with the Southern African Large Telescope in 2012–2021. Aims. We aimed at disentangling the Mg II and UV Fe II variability and the first measurement of UV Fe II time delay for a distant quasar. Methods. We used several methods for the time-delay measurements and determined the Fe II and Mg II time delays. We also performed a wavelength-resolved time delay study for a combination of Mg II and Fe II in the 2700–2900 Å rest-frame wavelength range. Results. We obtain a time delay for Mg II of 275.5$_{-19.5} ^{+12.4}$ days in the rest frame, and we have two possible solutions of 270.0$_{-25.3} ^{+13.8}$ days and 180.3$_{-30.0} ^{+26.6}$ in the rest frame for Fe II. Combining this result with the old measurement of Fe II UV time delay for NGC 5548, we discuss for first time the radius-luminosity relation for UV Fe II with the slope consistent with 0.5 within the uncertainties. Conclusions. Because the Fe II time delay has a shorter time-delay component but the lines are narrower than Mg II, we propose that the line-delay measurement is biased toward the part of the broad line region (BLR) facing the observer. The bulk of the Fe II emission may arise from the more distant BLR region, however, the region that is shielded from the observer.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    Wavelength-resolved reverberation mapping of intermediate-redshift quasars HE 0413-4031 and HE 0435-4312 : dissecting Mg II, optical Fe II, and UV Fe II emission regions
    Autorzy:
    Sobrino Figaredo, Catalina
    Olejak, Aleksandra
    Martinez-Aldama, Mary Loli
    Rałowski, Mateusz
    Udalski, Andrzej
    Haas, Martin
    Hryniewicz, Krzysztof
    Prince, Raj
    Panda, Swayamtrupta
    Pietrzyński, Grzegorz
    Worters, Hannah L.
    Sarna, Marek Jacek
    Trzcionkowski, Piotr
    Genade, Anja
    Przyłuski, Robert
    Bilicki, Maciej
    Bronikowski, Mateusz
    Kozłowski, Szymon
    Śniegowska, Marzena
    Karas, Vladimir
    Czerny, Bożena
    Kumar Jaiswal, Vikram
    Średzińska, Justyna
    Pandey, Ashwani
    Sefako, Ramotholo R.
    Zajaček, Michal
    Naddaf, Mohammad-Hassan
    Opis:
    Context. We present the wavelength-resolved reverberation mapping (RM) of combined Mg II and UV Fe II broad-line emissions for two intermediate-redshift (z ∼ 1), luminous quasars, HE 0413-4031 and HE 0435-4312, monitored by the Southern African Large Telescope (SALT) and 1m class telescopes between 2012 and 2022. Aims. Using a wavelength-resolved technique, we aim to disentangle the Mg II and Fe II emission regions and to build a radius–luminosity (R–L) relation for UV Fe II emission, which has so far remained unconstrained. Methods. We applied several time-delay methodologies to constrain the time delays for total Mg II and Fe II emissions. In addition, wavelength-resolved RM is performed to quantify the inflow or outflow of broad-line region (BLR) gas around the supermassive black hole and to disentangle the emission and the emitting regions based on lines produced in proximity to each other. Results. The mean total FeII time delay is nearly equal to the mean total MgII time delay for HE 0435-4312, suggesting the co-spatiality of their emission regions. However, in HE 0413-4031, the mean FeII time delay is found to be longer than the mean MgII time delay, suggesting that FeII emission is produced at greater distances from the black hole. The UV FeII R–L relation is updated with these two quasars (now four in total) and compared with the optical FeII relation (20 sources), which suggests that the optical FeII emission region is located further than the UV FeII region by a factor of 1.7–1.9, that is, R$_{FeII-opt}$ ∼ (1.7 − 1.9)R$_{FeII-UV}$. Conclusion. Wavelength-resolved reverberation is an efficient way to constrain the geometry and structure of the BLR. We detected a weak pattern in the time delay versus wavelength relation, suggesting that the MgII broad line originates from a region slightly closer to the SMBH than the UV FeII pseudo continuum, although the difference is not very significant. Comparison of MgII, UV, and optical FeII R–L relations suggests that the difference may be greater for lower-luminosity sources, possibly with the MgII emission originating further from the SMBH. In the future, more RM data will be acquired, allowing better constraints on these trends, in particular the UV FeII R–L relation.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
      Wyświetlanie 1-5 z 5

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