8 research outputs found
New locality of rare species of plants in Volynian Polissia
No full textForty six (46) rare species of plants, detected by the author in Volynian Polissia, are analyzed by the categories of rarity. New localities of three rare species and recommendations on their protection are given
New locality of rare species of plants in Volynian Polissia
No full textForty six (46) rare species of plants, detected by the author in Volynian Polissia, are analyzed by the categories of rarity. New localities of three rare species and recommendations on their protection are given
Global nickel anomaly links Siberian Traps eruptions and the latest Permian mass extinction
No full textAbstractAnomalous peaks of nickel abundance have been reported in Permian-Triassic boundary sections in China, Israel, Eastern Europe, Spitzbergen, and the Austrian Carnic Alps. New solution ICP-MS results of enhanced nickel from P-T boundary sections in Hungary, Japan, and Spiti, India suggest that the nickel anomalies at the end of the Permian were a worldwide phenomenon. We propose that the source of the nickel anomalies at the P-T boundary were Ni-rich volatiles released by the Siberian volcanism, and by coeval Ni-rich magma intrusions. The peaks in nickel abundance correlate with negative δ13C and δ18O anomalies, suggesting that explosive reactions between magma and coal during the Siberian flood-basalt eruptions released large amounts of CO2 and CH4 into the atmosphere, causing severe global warming and subsequent mass extinction. The nickel anomalies may provide a timeline in P-T boundary sections, and the timing of the peaks supports the Siberian Traps as a contributor to the latest Permian mass extinction.</jats:p
Host galaxy magnitude of OJ 287 from its colours at minimum light
No full textFull list of authors: Valtonen, Mauri J.; Dey, Lankeswar; Zola, S.; Ciprini, S.; Kidger, M.; Pursimo, T.; Gopakumar, A.; Matsumoto, K.; Sadakane, K.; Caton, D. B.; Nilsson, K.; Komossa, S.; Bagaglia, M.; Baransky, A.; Boumis, P.; Boyd, D.; Castro-Tirado, A. J.; Debski, B.; Drozdz, M.; Escartin Perez, A.; Fiorucci, M.; Garcia, F.; Gazeas, K.; Ghosh, S.; Godunova, V; Gomez, J. L.; Gredel, R.; Grupe, D.; Haislip, J. B.; Henning, T.; Hurst, G.; Janik, J.; Kouprianov, V. V.; Lehto, H.; Liakos, A.; Mathur, S.; Mugrauer, M.; Naves Nogues, R.; Nucciarelli, G.; Ogloza, W.; Ojha, D. K.; Pajdosz-Smierciak, U.; Pascolini, S.; Poyner, G.; Reichart, D. E.; Rizzi, N.; Roncella, F.; Sahu, D. K.; Sillanpaa, A.; Simon, A.; Siwak, M.; Soldan Alfaro, F. C.; Sonbas, E.; Tosti, G.; Vasylenko, V.; Webb, J. R.; Zielinski, P.OJ 287 is a BL Lacertae type quasar in which the active galactic nucleus (AGN) outshines the host galaxy by an order of magnitude. The only exception to this may be at minimum light when the AGN activity is so low that the host galaxy may make quite a considerable contribution to the photometric intensity of the source. Such a dip or a fade in the intensity of OJ 287 occurred in 2017 November, when its brightness was about 1.75 mag lower than the recent mean level. We compare the observations of this fade with similar fades in OJ 287 observed earlier in 1989, 1999, and 2010. It appears that there is a relatively strong reddening of the B− V colours of OJ 287 when its V-band brightness drops below magnitude 17. Similar changes are also seen in V− R, V− I, and R− I colours during these deep fades. These data support the conclusion that the total magnitude of the host galaxy is V = 18.0 ± 0.3, corresponding to MK = −26.5 ± 0.3 in the K-band. This is in agreement with the results, obtained using the integrated surface brightness method, from recent surface photometry of the host. These results should encourage us to use the colour separation method also in other host galaxies with strongly variable AGN. In the case of OJ 287, both the host galaxy and its central black hole are among the biggest known, and its position in the black hole mass–galaxy mass diagram lies close to the mean correlation. © 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.SZ would also like to acknowledge support of the NCN grant no. 2018/29/B/ST9/01793, and KM JSPS KAKENHI grant no. 19K03930.With funding from the Spanish government through the Severo Ochoa Centre of Excellence accreditation SEV-2017-0709.Peer reviewe
Discovery of standstills in the SU UMa-type dwarf nova NY Serpentis
No full text© The Author(s) 2019. We found that the SU UMa-type dwarf nova NY Ser in the period gap [orbital period 0.097558(6) d] showed standstills twice in 2018. This is the first clear demonstration of a standstill occurring between superoutbursts of an SU UMa-type dwarf nova. There was no sign of superhumps during the standstill, and at least one superoutburst directly started from the standstill. This provides strong evidence that the 3:1 resonance was excited during standstills. This phenomenon indicates that the disk radius can grow during standstills. We also deduce that the condition close to the limit of the tidal instability caused early quenching of superoutbursts, which resulted in a substantial amount of matter left in the disk after the superoutburst. We think that substantial matter in the disk in a condition close to the limit of the tidal instability is responsible for standstills (as in the high-mass-transfer system NY Ser) or multiple rebrightenings (as in the low-mass-transfer system V1006 Cyg)
Resiting genre : a study of contemporary Italian travel writing in English translation
No full textThis thesis aims to highlight the presence of a large and varied production of contemporary
Italian travel writing and to analyse the reasons for its 'invisibility' in the Italian literary
system and critical tradition. Through the use of a comparative approach to genre and of
current theories developed in the area of Translation Studies, the thesis will outline the
different status attributed to travel writing in the Anglo-American and the Italian literary
systems. Such a comparative approach allows the study to escape the narrow confines of a
perspective based on the idea of national literature and to adopt a wider view, which, in
turn, highlights the presence of phenomena otherwise easily overlooked or discarded as
insignificant.
The peculiar characteristics of travel writing, a genre mostly based on the
representation of the Other for a home audience, are also analysed in order to point out their
affinity with translation practices and, ultimately, to underline the 'double translation'
implied by translated travel writing.
The case studies which make up the remaining part of the thesis are intended to
illustrate different aspects of the genre of travel writing; to provide scope for an analysis of
its boundaries and connections with other genres (ranging from ethnography to
autobiography, from journalism to fiction, from the essay to the novel); and to illustrate the
way in which generic expectations influence both the selection of texts for translation and
the strategies adopted when translating and marketing them for a new audience.
The writings of twentieth-century Italian explorers to Tibet, and their translations
into English, constitute a significant case of adaptation of foreign texts to the needs and
expectations of a British audience (and to the British interests in the geographical area
concerned).
The works of Oriana Fallaci and their different reception in Italy with respect to the
UK and the USA illustrate the way in which personal biography and generic choices can
intersect, determining both the popular image and the critical success of an author and of
her work.
Calvino's choice to sublimate the genre of travel writing in the stylized fiction of Le
citta invisibili is treated as an example of the way in which a text which is meant to provide
an escape from a low-status genre can become an icon of that same genre once it is
translated and read in a different cultural context.
Finally, the case of Claudio Magris's Danubio and of its English-language
translation provides evidence of the complex network of literary references which marks the
reception of a text in different cultures, and of the way in which generic affiliation can both
promote the recognition of a 'marginal' text and constrain its more idiosyncratic (and
original) characteristics
Host galaxy magnitude of OJ 287 from its colours at minimum light
No full textOJ 287 is a BL Lacertae type quasar in which the active galactic nucleus (AGN) outshines the host galaxy by an order of magnitude. The only exception to this may be at minimum light when the AGN activity is so low that the host galaxy may make quite a considerable contribution to the photometric intensity of the source. Such a dip or a fade in the intensity of OJ 287 occurred in 2017 November, when its brightness was about 1.75 mag lower than the recent mean level. We compare the observations of this fade with similar fades in OJ 287 observed earlier in 1989, 1999, and 2010. It appears that there is a relatively strong reddening of the B-V colours of OJ 287 when its V-band brightness drops below magnitude 17. Similar changes are also seen in V-R, V-I, and R-I colours during these deep fades. These data support the conclusion that the total magnitude of the host galaxy is V = 18.0 ± 0.3, corresponding to MK =-26.5 ± 0.3 in the K-band. This is in agreement with the results, obtained using the integrated surface brightness method, from recent surface photometry of the host. These results should encourage us to use the colour separation method also in other host galaxies with strongly variable AGN. In the case of OJ 287, both the host galaxy and its central black hole are among the biggest known, and its position in the black hole mass-galaxy mass diagram lies close to the mean correlation. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society
Multiband analyses of the bright GRB 230812B and the associated SN2023pel
No full textHussenot-Desenonges, T. et al.-- Full list of authors: Hussenot-Desenonges, T.; Wouters, T.; Guessoum, N.; Abdi, I.; Abulwfa, A.; Adami, C.; Agüí Fernández, J. F.; Ahumada, T.; Aivazyan, V.; Akl, D.; Anand, S.; Andrade, C. M.; Antier, S.; Ata, S. A.; D'Avanzo, P.; Azzam, Y. A.; Baransky, A.; Basa, S.; Blazek, M.; Bendjoya, P.; Beradze, S.; Boumis, P.; Bremer, M.; Brivio, R.; Buat, V.; Bulla, M.; Burkhonov, O.; Burns, E.; Cenko, S. B.; Coughlin, M. W.; Corradi, W.; Daigne, F.; Dietrich, T.; Dornic, D.; Ducoin, J. -G.; Duverne, P. -A.; Elhosseiny, E. G.; Elnagahy, F. I.; El-Sadek, M. A.; Ferro, M.; Le Floc'h, E.; Freeberg, M.; Fynbo, J. P. U.; Götz, D.; Gurbanov, E.; Hamed, G. M.; Hasanov, E.; Healy, B. F.; Heintz, K. E.; Hello, P.; Inasaridze, R.; Iskandar, A.; Ismailov, N.; Izzo, L.; Jhawar, S.; Jegou du Laz, T.; Kamel, T. M.; Karpov, S.; Klotz, A.; Koulouridis, E.; Kuin, N. P.; Kochiashvili, N.; Leonini, S.; Lu, K. -X.; Malesani, D. B.; Mašek, M.; Mao, J.; Melandri, A.; Mihov, B. M.; Natsvlishvili, R.; Navarete, F.; Nedora, V.; Nicolas, J.; Odeh, M.; Palmerio, J.; Pang, P. T. H.; De Pasquale, M.; Peng, H. W.; Pormente, S.; Peloton, J.; Pradier, T.; Pyshna, O.; Rajabov, Y.; Rakotondrainibe, N. A.; Rivet, J. -P.; Rousselot, L.; Saccardi, A.; Sasaki, N.; Schneider, B.; Serrau, M.; Shokry, A.; Slavcheva-Mihova, L.; Simon, A.; Sokoliuk, O.; Srinivasaragavan, G.; Strausbaugh, R.; Takey, A.; Tanvir, N. R.; Thöne, C. C.; Tillayev, Y.; Tosta e Melo, I.; Turpin, D.; de Ugarte Postigo, A.; Vasylenko, V.; Vergani, S. D.; Vidadi, Z.; Xu, D.; Wang, L. T.; Wang, X. F.; Winters, J. M.; Zhang, X. -L.; Zhu, Z.GRB 230812B is a bright and relatively nearby (z = 0.36) long gamma-ray burst (GRB) that has generated significant interest in the community and has thus been observed over the entire electromagnetic spectrum. We report over 80 observations in X-ray, ultraviolet, optical, infrared, and submillimetre bands from the GRANDMA (Global Rapid Advanced Network for Multimessenger Addicts) network of observatories and from observational partners. Adding complementary data from the literature, we then derive essential physical parameters associated with the ejecta and external properties (i.e. the geometry and environment) of the GRB and compare with other analyses of this event. We spectroscopically confirm the presence of an associated supernova, SN2023pel, and we derive a photospheric expansion velocity of v ∼ 17 × 10 km s. We analyse the photometric data first using empirical fits of the flux and then with full Bayesian inference. We again strongly establish the presence of a supernova in the data, with a maximum (pseudo-)bolometric luminosity of 5.75 × 10 erg s, at 15.76 d (in the observer frame) after the trigger, with a half-max time width of 22.0 d. We compare these values with those of SN1998bw, SN2006aj, and SN2013dx. Our best-fitting model favours a very low density environment (log(n/cm) = -2.38) and small values for the jet's core angle θ = 1.54 deg and viewing angle θ = 0.76 deg. GRB 230812B is thus one of the best observed afterglows with a distinctive supernova bump. © 2024 The Author(s).This work has been coordinated with Mansi Kasliwal and Brad
Cenko’s group, with whom we shared common developments and
visions for time-domain astronomy tools and methods (e.g. SKYPORTAL). We thank Gokul Prem Srinivasaragavan in particular for fruitful
exchanges on this object. We also thank the anonymous reviewer for
constructive comments that have helped improve the paper. The GRANDMA collaboration thanks its entire network of observatories/observers, all its partners in observations and analyses, and
the amateur participants of its Kilonova-Catcher (KNC) programme.
We dedicate this work to D. A. Kann, whose groundbreaking work
in the field of GRBs earned him international recognition over the
past two decades. Alex, your contributions to the world of GRB
science will always be remembered. We deeply miss you and hope
you are proud of the way the GRB community carries on your legacy.
This research has also made use of the MISTRAL data base, based
on observations made at Observatoire de Haute Provence (CNRS),
France, with the MISTRAL spectro-imager, and operated at CeSAM
(LAM), Marseille, France. The GRB OHP observing team is particularly grateful to Jerome ´ Schmitt for the major role he has played
in the development and operations of the MISTRAL instrument at
the T193 telescope. GRANDMA thanks amateur astronomers for
their observations: MS, KF, SL, JN, MF, MO. This work is based on
observations carried out under project number S23BG with the IRAM
NOEMA interferometer. Partly based on observations made with the
Gran Telescopio Canarias (GTC), installed at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrof´ısica de
Canarias, on the island of La Palma. Partly based on observations
made with the Nordic Optical Telescope, owned in collaboration by
the University of Turku and Aarhus University, and operated jointly
by Aarhus University, the University of Turku, and the University
of Oslo, representing Denmark, Finland, and Norway, the University
of Iceland and Stockholm University at the Observatorio del Roque
de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica
de Canarias. This work is based on observations collected at the
Centro Astronomico ´ Hispano en Andaluc´ıa (CAHA) at Calar Alto,
operated jointly by Junta de Andaluc´ıa and Consejo Superior de
Investigaciones Cient´ıficas (IAA-CSIC) (Programme code: 23B2.2-24, PI Agu¨´ı Fernandez, ´ J. F.). This work used Expanse at the
San Diego Supercomputer Cluster through allocation AST200029 –
‘Towards a complete catalog of variable sources to support efficient
searches for compact binary mergers and their products’ from the
Advanced Cyberinfrastructure Coordination Ecosystem: Services &
Support (ACCESS) programe. WC and NS wish to thank Laboratorio ´
Nacional de Astrof´ısica – LNA and OPD staff, Universidade do
Estado do Amazonas – UEA and the Brazilian Agencies CNPq and
Capes.
GRANDMA has received financial support from the CNRS
through the MITI interdisciplinary programmes. TW and PTHP
are supported by the research programme of the Netherlands
Organization for Scientific Research (NWO). SA acknowledges
the financial support of the Programme National Hautes Energies
(PNHE). MWC acknowledges support from the National Science
Foundation with grant numbers PHY-2347628 and OAC-2117997.
CA and MWC were supported by the Preparing for Astrophysics
with LSST Program, funded by the Heising-Simons Foundation
through grant 2021–2975, and administered by Las Cumbres
Observatory. The Egyptian team acknowledges support from the
Science, Technology & Innovation Funding Authority (STDF) under
grant number 45779. SK is supported by European Structural and
Investment Fund and the Czech Ministry of Education, Youth and
Sports (Project CoGraDS – CZ.02.1.01/0.0/0.0/15 003/0000437).
NPMK is supported by the UKSA Swift operations grant. NG,
DA, and IA acknowledge support from the American University of
Sharjah (UAE) through the grant FRG22-C-S68. MM issupported by
the LM2023032 and LM2023047 grants of the Ministry of Education
of the Czech Republic. JM is supported by the National Key R & D
Program of China (2023YFE0101200), the Yunnan Revitalization
Talent Support Program (YunLing Scholar Award), and NSFC grant
12393813. DBM acknowledgessupport from the European Research
Council (ERC) under the European Union’s research and innovation
programme (ERC Grant HEAVYMETAL No. 101071865). JGD is
supported by a research grant from the Ile-de-France Region within
the framework of the Domaine d’Inter´ etˆ Majeur-Astrophysique et
Conditions d’Apparition de la Vie (DIM-ACAV). The work of FN
is supported by NOIRLab, which is managed by the Association
of Universities for Research in Astronomy (AURA) under a
cooperative agreement with the National Science Foundation. The
Kilonova-Catcher programme is supported by the IdEx Universite´
de Paris Cite,´ ANR-18-IDEX-0001 and Paris-Saclay, IJCLAB.
IRAM is supported by INSU/CNRS (France), MPG (Germany) and
IGN (Spain). The Cosmic Dawn Center is supported by the Danish
National Research Foundation. The Advanced Cyberinfrastructure
Coordination Ecosystem: Services & Support (ACCESS) programe
is supported by National Science Foundation grants #2138259,
#2138286, #2138307, #2137603, and #2138296. With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2021-001131-S)
