Galaxy Mrk 335 examined with AstroSat

Galaxy Mrk 335 examined with AstroSat
X-ray mild curves for the 2 observations (Obs 1 & Obs 2) of Mrk 335 binned for 500 s. Credit score: Ezhikode et al., 2021.

Utilizing the AstroSat spacecraft, Indian astronomers have carried out multiwavelength observations of a Slim-Line Seyfert 1 (NLS1) galaxy often called Mrk 335. Outcomes of this investigation, offered in a paper revealed February 1 on the arXiv preprint server, ship essential details about the emission from this supply.


Slim-line Seyfert 1 (NLS1) galaxies are a category of energetic galactic nuclei (AGN) which have all of the properties of kind 1 Seyfert galaxies, however present peculiar traits like slim Balmer traces, robust Fe II emission, and excessive properties within the X-rays.

At a redshift of 0.026, Mrk 335 is an NLS1 galaxy exhibiting dramatic fluctuations between excessive and low flux states within the X-ray band. Earlier research of this galaxy have discovered that it showcases appreciable variability within the optical and ultraviolet (UV) bands that seems to be correlated and uncorrelated with the X-ray variability at varied epochs.

In an effort to get extra insights into this variability, a staff of astronomers from the Inter-College Centre for Astronomy and Astrophysics in India, led by Savithri H. Ezhikode, has carried out multiwavelength observations of Mrk 335 with AstroSat in X-ray and UV bands.

“Mrk 335 was noticed concurrently within the X-ray and UV bands with Mushy X-ray Telescope, Giant Space X-ray Proportional Counter (LAXPC), Cadmium Zinc Telluride Imager (CZTI), and Ultraviolet Imaging Telescope (UVIT) aboard AstroSat on October 31, 2017 (Obs 1) and November 18, 2017 (Obs 2),” the researchers wrote within the paper.

Throughout AstroSat observations, Mrk 335 turned out to be in a low-flux state in X-rays and within the UV band, and the X-ray spectra had been discovered to be more durable than common. The monitoring recognized variability in each near-UV (NUV) and much (UV) FUV emissions, however no significant variability was discovered between the 2 carried out X-ray observations.

Each Obs1 and Obs2 had been discovered to be intrinsically absorbed with photon index at a stage of roughly 9.Zero sextillion cm-2. The entire flux within the 2–20 keV is roughly 0.02 nanoerg/cm2/s, and within the 0.7–2 keV band it’s some 0.0006 nanoerg/cm2/s.

The UV flux was discovered to be variable between Obs 1 and Obs 2. The astronomers assume that X-ray reprocessing or the obscuration of X-rays by clouds might be the origin of the noticed UV variability. Nonetheless, extra research of Mrk 335, together with detailed modeling of the broadband (SED) are wanted as a way to discover out which situation is true.

“A extra detailed characterisation of broadband X-ray continuum emissions could also be carried out with future higher observations with AstroSat. With simultaneous filter and grating observations with UVIT, we will additionally research the character of variability within the accretion disc emission in depth,” the authors of the paper defined.


Fornax A galaxy investigated with AstroSat


Extra data:
AstroSat view of the NLS1 galaxy Mrk 335, arXiv:2102.00805 [astro-ph.HE] arxiv.org/abs/2102.00805

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Galaxy Mrk 335 examined with AstroSat (2021, February 9)
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