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KIND REMINDER.<br class="">
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<div class="">On 25 Feb 2019, at 14:25, Andre Schneider <<a href="mailto:andre.schneider@astro.su.se" class="">andre.schneider@astro.su.se</a>> wrote:</div>
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Dear colleagues, </div>
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<span role="button" class="ms-font-color-themePrimary contextualExtensionHighlight ident_110_217 ms-border-color-themePrimary" tabindex="0">our next EO meeting will take place this Thursday </span><b class=""><span role="button" class="ms-font-color-themePrimary contextualExtensionHighlight ident_110_217 ms-border-color-themePrimary" tabindex="0">Feb
28</span></b><span role="button" class="ms-font-color-themePrimary contextualExtensionHighlight ident_110_217 ms-border-color-themePrimary" tabindex="0"> at </span><b class=""><span role="button" class="ms-font-color-themePrimary contextualExtensionHighlight ident_110_217 ms-border-color-themePrimary" tabindex="0">13:15</span></b><span role="button" class="ms-font-color-themePrimary contextualExtensionHighlight ident_110_217 ms-border-color-themePrimary" tabindex="0"> in
the KTH meeting room on the 5th floor.</span> </div>
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<div class=""><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;" class=""><b class="">Dr Dan Perley</b><span class="Apple-converted-space"> </span>visiting from<span class="Apple-converted-space"> </span><b class="">LJMU</b> will
present us the following talk</span><br class="">
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<div style="margin-top: 0px; margin-bottom: 0px;" class=""><span style="font-size: 12pt; color: rgb(33, 33, 33); font-family: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif, serif, EmojiFont;" class=""><br class="">
</span></div>
<div style="margin-top: 0px; margin-bottom: 0px;" class=""><span style="font-size: 12pt; color: rgb(33, 33, 33); font-family: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif, serif, EmojiFont;" class="">Multiwavelength Observations of
the Extreme Transient AT2018cow</span><br class="">
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<font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class=""><br class="">
</span></font></div>
<div style="margin-top: 0px; margin-bottom: 0px;" class=""><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">The bright, luminous, and fast multiwavelength
transient AT2018cow </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">displayed unprecedented behavior at almost every waveband:
a </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">fast-evolving UV/optical counterpart that maintains an extremely hot </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">photospheric
temperature over its entire evolution, an </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">erratically-fluctuating luminous X-ray
counterpart, and a heavily </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">self-absorbed </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">radio/submillimeter
counterpart. We present a comprehensive set </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">of photometric and spectroscopic observations
of this transient from </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">groundbased observatories spanning four continents and
from space, </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">including multiwavelength observations from Swift, NuSTAR, Astrosat, </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">SMA,
and ALMA. We consider both supernova and intermediate-mass black </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">hole tidal disruption
event interpretations for its origin, although no </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">simple theoretical model can
explain the full set of observations. </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">Transients similar to AT2018cow are probably
not rare in the universe: </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">we are on the alert for more such objects within ZTF,
and anticipate </span></font><font face="wf_segoe-ui_normal,Segoe UI,Segoe WP,Tahoma,Arial,sans-serif,serif,EmojiFont" size="1" color="#212121" class=""><span style="font-size: 12pt;" class="">that they will be detected in large numbers by LSST in the coming
decade.</span></font><br class="">
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<div style="margin-top: 0px; margin-bottom: 0px; font-size: 16px; font-family: Calibri, Helvetica, sans-serif;" class="">
André da Silva Schneider<br class="">
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<span style="font-size: 10pt; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont;" class="">Department of Astronomy</span><br class="">
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<span style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont;" class=""><span style="font-size: 10pt;" class="">Stockholm University</span></span></div>
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<a href="mailto:okc-wp4@albanova.se" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">okc-wp4@albanova.se</a><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><span class="Apple-converted-space"> </span>mailing
list</span></div>
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<div class="">----------------------------------------------<br class="">
Prof. Dr. Stephan Rosswog </div>
<div class="">Computational High-Energy Astrophysics<br class="">
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The Oskar Klein Centre for Cosmoparticle Physics<br class="">
Department of Astronomy, Stockholm University<br class="">
AlbaNova, Roslagstullbacken 21<br class="">
SE-10691 Stockholm, Sweden<br class="">
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<a href="mailto:stephan.rosswog@astro.su.se" class="">Email: stephan.rosswog@astro.su.se</a><br class="">
Tel.: +46 (0)8 5537 8529<br class="">
URL: http://compact-merger.astro.su.se/</div>
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