A. Akyüz, S. Kayaci, Hasan Avdan, M. E. Özel, Э. Сонбас, Ş. Balman,
... a sample of three nearby spiral galaxies (NGC 4395, NGC 4736, and NGC 4258) based on XMM-Newton ...
Tópico(s): Pulsars and Gravitational Waves Research
2013 - Institute of Physics | The Astronomical Journal
Lynn T. Matthews, J. S. Gallagher, John Krist, A. M. Watson, Christopher J. Burrows, R. E. Griffiths, J. J. Hester, John T. Trauger, G. E. Ballester, J. T. Clarke, David Crisp, Robin W. Evans, J. G. Hoessel, Jon A. Holtzman, J. R. Mould, Paul A. Scowen, Karl R. Stapelfeldt, James A. Westphal,
... nearby, late-type, low-luminosity spiral galaxies NGC 4395, NGC 4242, and ESO 359-029. In addition, we ... the structural and photometric properties of their nuclei. NGC 4395 contains a Seyfert 1 nucleus; M33 has some ... a possible jetlike component. The Seyfert nucleus of NGC 4395 has an extremely blue color (B-I = -0. ... emission from gas within a nuclear ionization cone. NGC 4395 appears to contain an underlying normal star cluster nucleus that is hosting activity. NGC 4242 shows evidence of a slightly elongated, bar- ...
Tópico(s): Astrophysical Phenomena and Observations
1999 - Institute of Physics | The Astronomical Journal
Marcelo D. Mora, S. S. Larsen, M. Kissler‐Patig, Jean P. Brodie, T. Richtler,
... nearby spiral galaxies: NGC 45, NGC 1313, NGC 4395, NGC 5236, and NGC 7793. Methods. We obtained images ...
Tópico(s): Stellar, planetary, and galactic studies
2009 - EDP Sciences | Astronomy and Astrophysics
I. Leonidaki, P. Boumis, A. Zezas,
... galaxies (NGC 2403, NGC 3077, NGC 4214, NGC 4395, NGC 4449 and NGC 5204) based on deep narrow ...
Tópico(s): Gamma-ray bursts and supernovae
2012 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
M. L. Parker, A. C. Fabian, G. Matt, K. I. I. Koljonen, Erin Kara, William Alston, D. J. Walton, Andrea Marinucci, Laura Brenneman, G. Risaliti,
... evidence of varying partial covering neutral absorption (NGC 4395, NGC 1365, and NGC 4151). In over half of ...
Tópico(s): Gamma-ray bursts and supernovae
2014 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
I. Leonidaki, A. Zezas, P. Boumis,
... 2403, NGC 3077, NGC 4214, NGC 4449, NGC 4395 and NGC 5204) based on Chandra archival data. We have ... the galaxies in our sample (NGC 4214, NGC 4395 and NGC 5204) are studied for the first time, resulting ...
Tópico(s): Galaxies: Formation, Evolution, Phenomena
2010 - IOP Publishing | The Astrophysical Journal
Ashley L. King, J. M. Mïller, M. T. Reynolds, Kayhan Gültekin, Elena Gallo, D. Maitra,
... variations into the jet. Further, when both NGC 4395 and NGC 4051 are placed on the stellar-mass LX– ...
Tópico(s): Gamma-ray bursts and supernovae
2013 - IOP Publishing | The Astrophysical Journal Letters
К. И. Смирнова, D. S. Wiebe, А. В. Моисеев, G. I. G. Józsa,
... the peculiar galaxies NGC 660, NGC 1512, NGC 4395 and NGC 4618 are studied. The relationships between such characteristics ... brightness of SFRs; in the lopsided galaxies NGC 4395 and NGC 4618, the low brightness of SFRs in the ...
Tópico(s): Stellar, planetary, and galactic studies
2020 - Pleiades Publishing | Astrophysical Bulletin
Jean-René Roy, Julien Belley, Yvan Dutil, Pierre Martin,
... in the Low-Mass Galaxies NGC 2366 and NGC 4395 Roy, Jean-Rene ; Belley, Julien ; Dutil, Yvan ; Martin, ... and in the small weakly barred spiral galaxy NGC 4395, employing imaging spectrophotometry with narrow-band interference filters ... the H II regions in NGC 2366 and NGC 4395, [O III]/Hβ may not give reliable estimates ... H (+/-1 σ dispersion) in NGC 2366 and NGC 4395 are 12 + log O/H = 8.19 +/- 0. ... NGC NUMBER: NGC 2366; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4395; GALAXIES: ISM; ISM: H II REGIONS full text ...
Tópico(s): Gamma-ray bursts and supernovae
1996 - IOP Publishing | The Astrophysical Journal
A. V. Filippenko, W. L. W. Sargent,
... Luminosity Seyfert 1 Nucleus in the Dwarf Galaxy NGC 4395 Filippenko, Alexei V. ; Sargent, Wallace L. W. Abstract ... Mpc), late-type (Sd III-IV), dwarf galaxy NGC 4395. Such nuclei have never been seen in galaxies ... fainter than in the nucleus of M81; thus, NGC 4395 contains the least luminous known Seyfert 1 nucleus. ... It is possible that the nuclear properties of NGC 4395 can be explained in terms of stellar phenomena, ... Regions; Line Spectra; Astrophysics; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4395; GALAXIES: NUCLEI; GALAXIES: SEYFERT; LINE PROFILES; SPECTROPHOTOMETRY full ...
Tópico(s): Stellar, planetary, and galactic studies
1989 - IOP Publishing | The Astrophysical Journal
A. Vinokurov, S. Fabrika, К. Атапин,
... ray sources (ULXs) NGC 4559 X-10 and NGC 4395 ULX-1. Their absolute magnitudes, after taking reddening ... a spectrum of an A-type star, whereas NGC 4395 ULX-1 has a blue power-law spectrum. Optical spectroscopy of NGC 4395 ULX-1 has shown a broad He ii ... Using the Swift archival X-ray data for NGC 4395 ULX-1, we have found a period of ...
Tópico(s): Pulsars and Gravitational Waves Research
2018 - IOP Publishing | The Astrophysical Journal
D. M. Crenshaw, S. B. Kraemer, J. R. Gabel, H. R. Schmitt, A. V. Filippenko, Luis C. Ho, Joseph C. Shields, T. J. Turner,
... spectra of the dwarf Seyfert 1 nucleus of NGC 4395, obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) ... absorption that are likely to be intrinsic to NGC 4395. We consider possible origins of the absorption, including the interstellar medium (ISM) of NGC 4395, the narrow-line region (NLR), outflowing UV absorbers, ... sec, most likely arises in the ISM of NGC 4395; its ionic column densities cannot be matched by ...
Tópico(s): Stellar, planetary, and galactic studies
2004 - IOP Publishing | The Astrophysical Journal
J. M. Wrobel, C. D. Fassnacht, Luis C. Ho,
... known Seyfert 1 nucleus, in the Sm galaxy NGC 4395. One continuum source was detected, with flux density ... the Galactic center. For the VLBA source in NGC 4395, the constraints on Tb, d, and P are ... like Cassiopeia A. Moreover, the spectral powers of NGC 4395 at 1.4 and 4.9 GHz appear ... The variable and warm X-ray absorber in NGC 4395 has a free-free optical depth much larger ...
Tópico(s): Astrophysics and Cosmic Phenomena
2001 - IOP Publishing | The Astrophysical Journal
D. T. Cameron, I. M. McHardy, T. Dwelly, E. Breedt, P. Uttley, P. Lira, P. Arévalo,
... optical programme monitoring the dwarf Seyfert nucleus in NGC 4395 in 2008-2009. The UV/optical flux from ... 1900 - 5500 {\AA}). In particular, the luminosity of NGC 4395 in the 1900 {\AA} band changed by more ... the intra-day X-ray/optical variability on NGC 4395. These archival data show a very strong correlation ... are consistent with the UV/optical variability of NGC 4395 being primarily due to reprocessing of X-ray ...
Tópico(s): Stellar, planetary, and galactic studies
2012 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
A. V. Filippenko, Luis C. Ho, W. L. W. Sargent,
... Metrics Export Citation NASA/ADS HST Observations of NGC 4395, the Least Luminous Seyfert 1 Nucleus: Evidence against ... spectra and optical images of the nucleus of NGC 4395, the least luminous and nearest known type 1 ... in a star cluster. Since the nucleus of NGC 4395 resembles those of other Seyfert 1 galaxies in ... Spectra; Astrophysics; GALAXIES: NUCLEI; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4395; GALAXIES: SEYFERT; GALAXIES: STARBURST full text sources ADS | ...
Tópico(s): Astronomical Observations and Instrumentation
1993 - IOP Publishing | The Astrophysical Journal
... IX X-1, NGC 5408 X-1, and NGC 4395 X-2 and also of the nuclear X-ray source in NGC 4395. Holmberg IX X-1 remains in the hard ... of these signals. NGC 5408 X-1 and NGC 4395 X-2 appear to remain in the soft ... found an outburst from the nuclear source in NGC 4395 reaching an X-ray luminosity of 9E40 erg/ ...
Tópico(s): Advanced X-ray Imaging Techniques
2009 - IOP Publishing | The Astrophysical Journal
Zhen-Yi Cai, Junxian Wang, Mouyuan Sun,
... four local Seyfert galaxies, including NGC 4151, NGC 4395, NGC 4593, and NGC 5548. In our scenario, relatively ...
Tópico(s): Astrophysics and Star Formation Studies
2020 - IOP Publishing | The Astrophysical Journal
NGC 4395 is one of the least luminous and nearest known type 1 Seyfert galaxies, and it also ... obeyed by classical AGNs. This may explain why NGC 4395 has a high-excitation (Seyfert) emission-line spectrum; ... spectra seem to accrete at significantly lower rates. NGC 4395, a pure disk galaxy, demonstrates that supermassive black ...
Tópico(s): Astronomy and Astrophysical Research
2003 - IOP Publishing | The Astrophysical Journal
Edward C. Moran, A. V. Filippenko, Luis C. Ho, Joseph C. Shields, T. Belloni, A. Comastri, S. L. Snowden, R. A. Sramek,
... X‐ray (ROSAT), infrared, and radio observations of NGC 4395, which harbors the optically least luminous type 1 ... the galaxy's nucleus. Interestingly, the SED of NGC 4395 differs markedly from the SEDs of both quasars ... these objects. The nuclear X‐ray source in NGC 4395 is variable and has an observed luminosity of ...
Tópico(s): Adaptive optics and wavefront sensing
1999 - Institute of Physics | Publications of the Astronomical Society of the Pacific
Takeo Minezaki, Yuzuru Yoshii, Yukiyasu Kobayashi, Keigo Enya, Masahiro Suganuma, Hiroyuki Tomita, Shintaro Koshida, Masahiro Yamauchi, Tsutomu Aoki,
... observation of the least luminous Seyfert 1 galaxy, NGC 4395, on 2004 May 1, and detected for the ... component of near-infrared continuum emission of the NGC 4395 nucleus is an extension of power-law continuum ... BVI and near-infrared JHK monitoring observation of NGC 4395 from 2004 February 12 until 2005 January 22, ...
Tópico(s): Astrophysics and Star Formation Studies
2006 - IOP Publishing | The Astrophysical Journal
S. Vaughan, K. Iwasawa, A. C. Fabian, Kentaro Hayashida,
... ray variability of the low-luminosity Seyfert nucleus NGC 4395, based on a long XMM–Newton observation, is ... amplitude of the variations seems intrinsically higher in NGC 4395 than most other Seyfert galaxies, even after accounting ... accretion rate (L/LEdd≲ 20 per cent for NGC 4395). The variations clearly follow the linear rms–flux ...
Tópico(s): Astrophysics and Cosmic Phenomena
2004 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
... we present results for the late-type spiral NGC 4395 using HST/ACS and HST/WFPC2 images. Different ... direct comparison of field stars and clusters in NGC 4395, we estimate the ratio of star formation rate ... caused by the low star formation rate of NGC 4395.
Tópico(s): Astronomy and Astrophysical Research
2010 - EDP Sciences | Astronomy and Astrophysics
... quality Keck spectrum of the Halpha line in NGC 4395 reveals symmetric exponential wings, fv\propto e^{-v/ ... electron scattering optical depth. The Halpha wings in NGC 4395 are well fit by an electron scattering model ... the BLR dynamical time, or ~1 week for NGC 4395. In contrast, the value of sigma should remain ...
Tópico(s): Astrophysics and Star Formation Studies
2006 - IOP Publishing | The Astrophysical Journal
K. Iwasawa, A. C. Fabian, O. Almaini, P. Lira, A. Lawrence, Kentaro Hayashida, H. Inoue,
... ray source and its strong, rapid, variability in NGC 4395, the least luminous Seyfert nucleus known. The X- ... process in accounting for the nuclear activity of NGC 4395. The ASCA spectrum shows a power-law continuum ... observed X-ray variability. The nuclear source of NGC 4395 is therefore consistent with a scaled-down version ...
Tópico(s): Astrophysics and Cosmic Phenomena
2000 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
P. Lira, Andrew L. Lawrence, P. T. O’Brien, R. A. Johnson, R. Terlevich, N. Bannister,
... variability in the least luminous known Seyfert galaxy, NGC 4395. Between 1996 July and 1997 January the featureless ... been observed. When compared with more luminous AGN, NGC 4395 appears to be very X-ray quiet. The ... observations, we examine the spectral energy distribution for NGC 4395 and discuss the physical conditions implied by the ...
Tópico(s): Astrophysics and Cosmic Phenomena
1999 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
Helena Treiber, Jason T. Hinkle, Michael Fausnaugh, B. J. Shappee, C. S. Kochanek, P. Vallely, Katie Auchettl, T. W. S. Holoien, A. V. Payne, Xinyu Dai,
... masses ≲ 106 M⊙. The low-mass galaxies NGC 4395 and NGC 4449 are two of our five ‘high-confidence’ ...
Tópico(s): Astronomy and Astrophysical Research
2023 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
Produção Nacional
Revisado por pares
Carine Brum, Marlon R. Diniz, Rogemar A. Riffel, A. Rodríguez-Ardila, Luis C. Ho, Rogério Riffel, Rachel Mason, Lucimara P. Martins, Andreea Petric, Rubén Sánchez-Janssen,
... the inner ∼50 pc of the dwarf galaxy NGC 4395, known to harbour an AGN. NGC 4395 is an ideal candidate to investigate the nature ...
Tópico(s): Astrophysical Phenomena and Observations
2019 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
Haim Edri, S. E. Rafter, Doron Chelouche, S. Kaspi, E. Behar,
... the nearby, low luminosity active galactic nuclei (AGN) NGC 4395. Using the Wise Observatory's 1m telescope equipped ... r$'$ and i$'$ broad band filters, we monitored NGC 4395 for 9 consecutive nights and obtained 3 light ...
Tópico(s): Gamma-ray bursts and supernovae
2012 - IOP Publishing | The Astrophysical Journal
Ari Laor, Aaron J. Barth, Luis C. Ho, A. V. Filippenko,
... Keck spectra of the H alpha line in NGC 4395, which has the smallest known broad-line region (~ ... could fit into the broad-line region of NGC 4395, yet the observed smoothness of the H alpha ...
Tópico(s): Stellar, planetary, and galactic studies
2005 - IOP Publishing | The Astrophysical Journal
Jun Yang, Xiaolong Yang, J. M. Wrobel, Z. Paragi, Leonid Gurvits, Luis C. Ho, Kristina Nyland, Lulu Fan, Daniel Tafoya,
NGC 4395 is a dwarf galaxy at a distance of about 4.3 Mpc (scale: ~0.021 pc ... 5$ solar masses. The early radio observations of NGC 4395 with the very long baseline interferometry (VLBI) network, High Sensitivity Array (HSA), at 1.4 GHz ...
Tópico(s): Astrophysical Phenomena and Observations
2022 - Oxford University Press | Monthly Notices of the Royal Astronomical Society