Ongoing supernova in M85?

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Ongoing supernova in M85?

#1  Postby newolder » Jun 25, 2020 3:04 pm

According to AstroNote 2020 126
Here we report the ATLAS discovery of the transient ATLAS20qoq (AT2020nlb) in galaxy MESSIER 85. The transient was discovered on MJD 59025.3 (2020-06-25.3) at m_o = 17.44 +/- 0.08. At a host distance of 17 Mpc, this corresponds to an absolute magnitude of M = -13.7 +/- 0.2. We have a recent non-detection two days before on MJD 59023.3 (2020-06-23.3), indicating this is a newly discovered transient and most probably a very young supernova. Rapid multi-wavelength follow-up of the source is strongly encouraged.

More @ link above


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We've just found new supernova candidate AT2020nlb in galaxy Messier85. @fallingstarIfA ATLAS telescope Mauna Loa, Hawaii spotted it few hours ago, data processed
@QUBelfast. This is big nearby galaxy, just the 55 million lightyrs away. Young explosion, didn't see it 2 days ago.

@SteveSmartt

When will the associated neutrinos arrive at the IceCube detector, I wonder? :ask:
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Re: Ongoing supernova in M85?

#2  Postby theropod_V_2.0 » Jun 25, 2020 3:56 pm

Shouldn’t the neutrino wave proceed the EM event?

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Re: Ongoing supernova in M85?

#3  Postby newolder » Jun 25, 2020 4:04 pm

theropod_V_2.0 wrote:Shouldn’t the neutrino wave proceed the EM event?

RS


I don't know. The neutrinos are emitted first but they don't travel at exactly c so the later emitted light has a chance to overtake the neutrinos en route. I don't know if 55 million light years is enough distance to allow this to happen though. :dunno:

I recall reports that neutrinos from SN1987a arrived to IceCube or some other neutrino detector before the light reached earthly telescopes but that SN was closer than 200k light years distant. :think:

ETA Here's the SN1987a neutrino report:
The appearance of a supernova in the Large Magellanic Cloud made it possible for the first time to detect the neutrino emission from the explosion of a stellar object. Several groups reported neutrino events, a few hours before the onset of the optical signal. ...

More @ Nature article
Last edited by newolder on Jun 25, 2020 4:13 pm, edited 1 time in total.
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Re: Ongoing supernova in M85?

#4  Postby theropod_V_2.0 » Jun 25, 2020 4:11 pm

Thanks, now I’m wishing I had a big ole light bucket Newt.

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Re: Ongoing supernova in M85?

#5  Postby Hermit » Jun 26, 2020 8:46 am

newolder wrote:via twitter
...nearby galaxy, just the 55 million lightyrs away.

Impressive. If I could travel at 300,000km/hr I'd get there in just 55 million years. Some neighbourhood.

Also, am I right in supposing that when astronomers speak of "ongoing" they mean "55 million years ago" in this case?
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Re: Ongoing supernova in M85?

#6  Postby newolder » Jun 26, 2020 9:11 am

300,000 km/hr is a mere 83 km/s so it'll take a lot longer than 55 million years to get there at that speed*.

Ongoing is for an observer on Earth and yes, the event began about 55 million years ago and the signals are just reaching us now.

*ETA The red shift recession velocity of M85 is 729 ± 2 km/s (wiki) so, you'd never get there at the quoted speed.

Aside: Events with accompanying e-m signals, gravitational waves and neutrinos (aka multi-messenger) can be used to make independent (from other techniques) estimates of the Hubble constant too. I expect such calculations for this event to be published somewhere soon... Wrong topic! :doh:
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Re: Ongoing supernova in M85?

#7  Postby Hermit » Jun 26, 2020 11:03 am

newolder wrote:300,000 km/hr is a mere 83 km/s so it'll take a lot longer than 55 million years to get there at that speed.

:oops: I blame my galloping dementia. It's become increasingly worrisome since I switched the espresso machine to "go" without placing the coffee mug underneath the spout a couple of years ago.

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Re: Ongoing supernova in M85?

#8  Postby newolder » Jun 26, 2020 11:20 am

No worries. Seconds and hours are indistinguishable to photons too.
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Re: Ongoing supernova in M85?

#9  Postby Hermit » Jun 26, 2020 11:29 am

:lol:
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Re: Ongoing supernova in M85?

#10  Postby felltoearth » Jun 26, 2020 11:32 pm

Hermit wrote:
newolder wrote:300,000 km/hr is a mere 83 km/s so it'll take a lot longer than 55 million years to get there at that speed.

:oops: I blame my galloping dementia. It's become increasingly worrisome since I switched the espresso machine to "go" without placing the coffee mug underneath the spout a couple of years ago.

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No problem, I had the exact same machine. I switched the machine to go once, got distracted, headed to the bedroom for something and took too long. The entire water reservoir was used up, ended on the floor and I burned out the pump. Dumb.
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