Stellar and dust properties in a sample of blue early type galaxies
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Published:2022
Issue:205
Volume:
Page:23-32
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ISSN:1450-698X
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Container-title:Serbian Astronomical Journal
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language:en
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Short-container-title:SERBIAN ASTRON J
Author:
Deshmukh S.P.1, Vagshette N.D.2, Patil M.K.3
Affiliation:
1. Department of Physics, Institute of Science, civil lines, Nagpur, India 2. Department of Physics and Electronics, Maharashtra Udaygiri Mahavidyalaya, Udgir, Latur, India 3. Swami Ramanand Teerth Marathwada University, Nanded, India
Abstract
This paper presents a comparative study of physical properties of a sample of
89 blue early-type galaxies (ETGs) from the local universe by fitting SEDs to
their multi-wavelength photometric and spectroscopic data. The detailed
template-based SED fitting analysis using the MAGPHY S and SED3FIT codes on
the interstellar dust extinction corrected UV-to-far-IR spectro-photometric
data enabled us to trace the evolutionary sequence of the blue ETGs on the
color-magnitude diagram. This study evidenced a decreasing trend of the SFR,
sSFR, dust mass, and dust mass fraction over the sequence from the SF - to -
the Seyferts - to - the LINERs. The UV-optical colors also enabled us to
estimate the look-back time of the last starburst phase in SF, Seyfert, and
LINER galaxies, probably pointing towards the evolutionary sequence of the
blue ETGs. Despite the blue colors and strong emission lines in the optical
regime of the electromagnetic spectrum, the blue ETGs in the present sample
occupy a position off the main sequence, commonly known as the green valley,
on the CMD plot and hence indicate the transitional state of their
non-secular evolution. A marginal positive correlation was noticed between
SFR per unit dust mass and the temperature of the cool ISM. The declining
trend of the cold dust temperature Tc over the sequence from the
SF-to-Seyfert-to-LINER implies that the AGNs in the systems are not enough
powerful to affect the cold component of the ISM.
Publisher
National Library of Serbia
Subject
Astronomy and Astrophysics
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