1. Occasional Galaxy
2. Occasional Galaxy Theatre

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If a high-end smartphone like the Samsung Galaxy S10 Plus keeps lagging or became sluggish, then there could be an issue with its firmware. Performance problems are often tied to system issues and while they’re often very annoying, they’re not really that difficult to fix. In fact, you may be able to make your phone run normally after doing some basic troubleshooting procedures.

Before anything else, if you have other issues with your device, try to browse through our troubleshooting page as we’ve already addressed several issues with this device. Odds are that we’ve already published a post that tackles similar problems. Try finding issues that have similar symptoms with what you currently have and feel free to use the solutions we’ve suggested. If they don’t work for you or if you still need our help, then fill up our questionnaire and hit submit to contact us.

Troubleshooting Galaxy S10 Plus that keeps lagging

There are times when this problem happens due to some apps that may have gone rogue. That’s what you need to rule out and then move to other possibilities if the problem continues to persists. With that being said, here’s what you need to do:

First solution: Force restart your Galaxy S10 Plus that keeps lagging

Before we begin with our troubleshooting, take a little time doing the forced reboot procedure especially if it’s the first time you notice your phone to lag or become sluggish. This procedure will refresh the phone’s memory and reload all its apps. If it’s just a very minor firmware issue, this procedure will fix it. To do it, press and hold the volume down button and the power key simultaneously for 10 seconds or more.

Your phone will reboot like it usually does but after that, try to see if the lags and sluggishness disappeared. If it still has poor performance or still keeps lagging, then move on to the next procedure.

Second solution: Run your phone that keeps lagging in Safe Mode

As I said earlier, it’s possible that this problem is caused by some rogue apps so this is the next thing we need to rule out. By running your phone in safe mode, you’re temporarily disabling all third-party applications in your phone. If some of them cause the phone to become sluggish, then it should work perfectly fine while in this mode. Here’s how to reboot your phone in safe mode:

1. Turn the device off.
2. Press and hold the Power key past the model name screen appearing on the screen.
3. When SAMSUNG appears on the screen, release the Power key.
4. Immediately after releasing the Power key, press and hold the Volume down key.
5. Continue to hold the Volume down key until the device finishes restarting.
6. When Safe mode appears in the bottom left corner of the screen, release the Volume down key.

Continue using your phone while in this mode. Pre-installed applications will continue to work without issues in this environment. If your phone still keeps lagging in this mode, then the problem could already be with the firmware. Skip to the fourth solution but if your phone works normally or even smoother, then it confirms that the cause of the problem is one or some of the third-party applications. Move on to the next solution.

Third solution: Uninstall rogue apps

Assuming that the problem is fixed while in safe mode, reboot your phone in normal mode and then determine which of the downloaded apps seem suspicious. Start with apps you recently downloaded and installed. I understand you may have some data you don’t want to lose from those apps so if possible, create a backup of those data and then uninstall suspicious apps one by one. Here’s how it’s done:

1. From the Home screen, swipe up on an empty spot to open the Apps tray.
2. Tap Settings > Apps.
3. Tap the desired application.
4. Tap UNINSTALL > OK.

You may have to uninstall more than one app to fix your phone that keeps lagging or became sluggish. Uninstalling an app is the easy part, determining which app is problematic is the challenge.

Fourth solution: Reset all settings in your phone

It’s possible that the cause of the problem are some incorrect settings or configuration that may have some conflicts with the system. To rule this possibility out, you should reset all its settings. This will bring the settings back to default but none of your files or data will be deleted. It’s one of those proven effective solution for this kind of problem and here’s how it’s done:

1. From the Home screen, swipe up on an empty spot to open the Apps tray.
2. Tap Settings > General Management > Reset > Reset settings.
3. Tap RESET SETTINGS.
4. If you have set up a PIN, enter it.
5. Tap RESET SETTINGS.
6. The device will restart to perform the reset of settings.

Continue to observe your phone to know if it still keeps lagging and if it still sluggish, then try the next procedure.

Fifth solution: Delete the system cache

The system cache plays a big role in making your phone run smoothly. Caches are created every time you use an app, service or feature. However, these files may get corrupted over time and when that happens, your phone may suffer from performance issues like the phone you’re currently have. To address this, delete the system cache so that it will be replaced with a new one.

1. Turn off the device.
2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
3. When the Android logo displays, release all three keys.
4. An ‘Installing system update’ message will show for 30 – 60 seconds before the Android system recovery menu options appear.
5. Press the Volume down key several times to highlight wipe cache partition.
6. Press Power key to select.
7. Press the Volume down key to highlight yes, them and press the Power key to select.
8. When the wipe cache partition is complete, Reboot system now is highlighted.
9. Press the Power key to restart the device.

Sixth solution: Backup files and reset your phone

After doing all the procedures above and your Galaxy S10 Plus still keeps lagging or still sluggish, then it’s time to reset your phone. A reset is the ultimate solution for this kind of problem but the thing is you have to create a backup of your important files and data as they will be deleted during the process.

Also, we recommend that you remove your Google account from your phone so that you won’t be locked out after the reset. Once everything is set and ready, follow these steps to do the master reset:

1. Back up data on the internal memory. If you have signed into a Samsung account on the device, you have activated Anti-theft and will need your Samsung credentials to finish the master reset.
2. Turn off the device.
3. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
4. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
5. Press the Volume down key several times to highlight ‘wipe data / factory reset’.
6. Press Power button to select.
7. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
8. Press Power button to select and start the master reset.
9. When the master reset is complete, ‘Reboot system now’ is highlighted.
10. Press the Power key to restart the device.

I hope that we’ve been able to help you fix the problem with your device. We would appreciate it if you helped us spread the word so please share this post if you found it helpful. Thank you so much for reading!

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A blazar is an active galactic nucleus (AGN) with a relativistic jet (a jet composed of ionized matter traveling at nearly the speed of light) directed very nearly towards an observer. Relativistic beaming of electromagnetic radiation from the jet makes blazars appear much brighter than they would be if the jet were pointed in a direction away from Earth.^[1] Blazars are powerful sources of emission across the electromagnetic spectrum and are observed to be sources of high-energy gamma rayphotons. Blazars are highly variable sources, often undergoing rapid and dramatic fluctuations in brightness on short timescales (hours to days). Some blazar jets exhibit apparent superluminal motion, another consequence of material in the jet traveling toward the observer at nearly the speed of light.

The blazar category includes BL Lac objects and optically violently variable (OVV) quasars. The generally accepted theory is that BL Lac objects are intrinsically low-power radio galaxies while OVV quasars are intrinsically powerful radio-loud quasars. The name 'blazar' was coined in 1978 by astronomer Edward Spiegel to denote the combination of these two classes.

In visible-wavelength images, most blazars appear compact and pointlike, but high-resolution images reveal that they are located at the centers of elliptical galaxies.^[2]

Blazars are important topics of research in astronomy and high-energy astrophysics. Blazar research includes investigation of the properties of accretion disks and jets, the central supermassive black holes and surrounding host galaxies, and the emission of high-energy photons, cosmic rays, and neutrinos.

In July 2018, the IceCube Neutrino Observatory team traced a neutrino that hit its Antarctica-based detector in September 2017 to its point of origin in a blazar 3.7 billion light-years away. This was the first time that a neutrino detector was used to locate an object in space.^[3][4][5]

Structure[edit]

Blazars, like all active galactic nuclei (AGN), are thought to be ultimately powered by material falling onto a supermassive black hole at the center of the host galaxy. Gas, dust and the occasional star are captured and spiral into this central black hole, creating a hot accretion disk which generates enormous amounts of energy in the form of photons, electrons, positrons and other elementary particles. This region is relatively small, approximately 10⁻³parsecs in size.

There is also a larger opaque toroid extending several parsecs from the black hole, containing a hot gas with embedded regions of higher density. These 'clouds' can absorb and re-emit energy from regions closer to the black hole. On Earth, the clouds are detected as emission lines in the blazar spectrum.

Perpendicular to the accretion disk, a pair of relativistic jets carries highly energetic plasma away from the AGN. The jet is collimated by a combination of intense magnetic fields and powerful winds from the accretion disk and toroid. Inside the jet, high energy photons and particles interact with each other and the strong magnetic field. These relativistic jets can extend as far as many tens of kiloparsecs from the central black hole.

All of these regions can produce a variety of observed energy, mostly in the form of a nonthermal spectrum ranging from very low-frequency radio to extremely energetic gamma rays, with a high polarization (typically a few percent) at some frequencies. The nonthermal spectrum consists of synchrotron radiation in the radio to X-ray range, and inverse Compton emission in the X-ray to gamma-ray region. A thermal spectrum peaking in the ultraviolet region and faint optical emission lines are also present in OVV quasars, but faint or non-existent in BL Lac objects.

Relativistic beaming[edit]

The observed emission from a blazar is greatly enhanced by relativistic effects in the jet, a process called relativistic beaming. The bulk speed of the plasma that constitutes the jet can be in the range of 95%–99% of the speed of light, although individual particles move at higher speeds in various directions.

The relationship between the luminosity emitted in the rest frame of the jet and the luminosity observed from Earth depends on the characteristics of the jet. These include whether the luminosity arises from a shock front or a series of brighter blobs in the jet, as well as details of the magnetic fields within the jet and their interaction with the moving particles.

A simple model of beaming illustrates the basic relativistic effects connecting the luminosity in the rest frame of the jet, S_e, and the luminosity observed on Earth, S_o: S_o is proportional to S_e × D², where D is the doppler factor.

When considered in much more detail, three relativistic effects are involved:

• Relativistic aberration contributes a factor of D². Aberration is a consequence of special relativity where directions which appear isotropic in the rest frame (in this case, the jet) appear pushed towards the direction of motion in the observer's frame (in this case, Earth).
• Time dilation contributes a factor of D⁺¹. This effect speeds up the apparent release of energy. If the jet emits a burst of energy every minute in its own rest frame, this release would be observed on Earth as much more frequent, perhaps every ten seconds.
• Windowing can contribute a factor of D⁻¹ and then works to decrease boosting. This happens for a steady flow because there are then D fewer elements of fluid within the observed window, as each element has been expanded by factor D. However, for a freely propagating blob of material, the radiation is boosted by the full D⁺³.

Example[edit]

Consider a jet with an angle to the line of sight θ = 5° and a speed of 99.9% of the speed of light. The luminosity observed from Earth is 70 times greater than the emitted luminosity. However, if θ is at the minimum value of 0° the jet will appear 600 times brighter from Earth.

Beaming away[edit]

Relativistic beaming also has another critical consequence. The jet which is not approaching Earth will appear dimmer because of the same relativistic effects. Therefore, two intrinsically identical jets will appear significantly asymmetric. In the example given above any jet where θ > 35° will be observed on Earth as less luminous than it would be from the rest frame of the jet.

A further consequence is that a population of intrinsically identical AGN scattered in space with random jet orientations will look like a very inhomogeneous population on Earth. The few objects where θ is small will have one very bright jet, while the rest will apparently have considerably weaker jets. Those where θ varies from 90° will appear to have asymmetric jets.

This is the essence behind the connection between blazars and radio galaxies. AGN which have jets oriented close to the line of sight with Earth can appear extremely different from other AGN even if they are intrinsically identical.

Discovery[edit]

Many of the brighter blazars were first identified, not as powerful distant galaxies, but as irregular variable stars in our own galaxy. These blazars, like genuine irregular variable stars, changed in brightness on periods of days or years, but with no pattern.

The early development of radio astronomy had shown that there are many bright radio sources in the sky. By the end of the 1950s, the resolution of radio telescopes was sufficient to identify specific radio sources with optical counterparts, leading to the discovery of quasars. Blazars were highly represented among these early quasars, and the first redshift was found for 3C 273, a highly variable quasar which is also a blazar.

In 1968, a similar connection was made between the 'variable star' BL Lacertae and a powerful radio source VRO 42.22.01.^[6] BL Lacertae shows many of the characteristics of quasars, but the optical spectrum was devoid of the spectral lines used to determine redshift. Faint indications of an underlying galaxy—proof that BL Lacertae was not a star—were found in 1974.

The extragalactic nature of BL Lacertae was not a surprise. In 1972 a few variable optical and radio sources were grouped together and proposed as a new class of galaxy: BL Lacertae-type objects. This terminology was soon shortened to 'BL Lacertae object', 'BL Lac object' or simply 'BL Lac'. (The latter term can also mean the original individual blazar and not the entire class.)

Occasional Galaxy

As of 2003, a few hundred BL Lac objects were known. One of the closest blazars is 2.5 billion light years away.^[7][8]

Occasional Galaxy Theatre

Current view[edit]

Blazars are thought to be active galactic nuclei, with relativistic jets oriented close to the line of sight with the observer.

The special jet orientation explains the general peculiar characteristics: high observed luminosity, very rapid variation, high polarization (compared to non-blazar quasars), and the apparent superluminal motions detected along the first few parsecs of the jets in most blazars.

A Unified Scheme or Unified Model has become generally accepted, where highly variable quasars are related to intrinsically powerful radio galaxies, and BL Lac objects are related to intrinsically weak radio galaxies.^[9] The distinction between these two connected populations explains the difference in emission line properties in blazars.^[10]

Other explanations for the relativistic jet/unified scheme approach which have been proposed include gravitational microlensing and coherent emission from the relativistic jet. Neither of these explains the overall properties of blazars. For example, microlensing is achromatic. That is, all parts of a spectrum would rise and fall together. This is not observed in blazars. However, it is possible that these processes, as well as more complex plasma physics, can account for specific observations or some details.

Examples of blazars include 3C 454.3, 3C 273, BL Lacertae, PKS 2155-304, Markarian 421, Markarian 501 and S5 0014+81. Markarian 501 and S5 0014+81 are also called 'TeV Blazars' for their high energy (teraelectron-volt range) gamma-ray emission. S5 0014+81 is also notable for the most massive black hole ever observed, at 40 billion solar masses.

In July 2018, a blazar called TXS 0506+056^[11] was identified as source of high-energy neutrinos by the IceCube project.^[4][5][12]

See also[edit]

Notes[edit]

1. ^Urry, C. M.; Padovani, P. (1995). 'Unified Schemes for Radio-Loud Active Galactic Nuclei'. Publications of the Astronomical Society of the Pacific. 107: 803. arXiv:astro-ph/9506063. Bibcode:1995PASP..107..803U. doi:10.1086/133630. S2CID17198955.
2. ^Urry, C. M.; Scarpa, R.; O'Dowd, M.; Falomo, R.; Pesce, J. E.; Treves, A. (2000). 'The Hubble Space Telescope Survey of BL Lacertae Objects. II. Host Galaxies'. The Astrophysical Journal. 532 (2): 816. arXiv:astro-ph/9911109. Bibcode:2000ApJ...532..816U. doi:10.1086/308616. S2CID17721022.
3. ^Overbye, Dennis (12 July 2018). 'It Came From a Black Hole, and Landed in Antarctica - For the first time, astronomers followed cosmic neutrinos into the fire-spitting heart of a supermassive blazar'. The New York Times. Retrieved 13 July 2018.
4. ^ ^ab'Neutrino that struck Antarctica traced to galaxy 3.7bn light years away'. The Guardian. 12 July 2018. Retrieved 12 July 2018.
5. ^ ^ab'Source of cosmic 'ghost' particle revealed'. BBC. 12 July 2018. Retrieved 12 July 2018.^{[permanent dead link]}
6. ^Schmitt J. L. (1968): 'BL Lac identified as radio source', Nature 218, 663
7. ^'Some Bizarre Black Holes Put On Light Shows'. NPR.org. Retrieved 2020-07-12.
8. ^Uchiyama, Yasunobu; Urry, C. Megan; Cheung, C. C.; Jester, Sebastian; Van Duyne, Jeffrey; Coppi, Paolo; Sambruna, Rita M.; Takahashi, Tadayuki; Tavecchio, Fabrizio; Maraschi, Laura (2006-09-10). 'Shedding New Light on the 3C 273 Jet with the Spitzer Space Telescope'. The Astrophysical Journal. 648 (2): 910–921. arXiv:astro-ph/0605530. Bibcode:2006ApJ...648..910U. doi:10.1086/505964. ISSN0004-637X.
9. ^'Black Hole 'Batteries' Keep Blazars Going and Going'. Retrieved 2015-05-31.
10. ^Ajello, M.; Romani, R. W.; Gasparrini, D.; Shaw, M. S.; Bolmer, J.; Cotter, G.; Finke, J.; Greiner, J.; Healey, S. E. (2014-01-01). 'The Cosmic Evolution of Fermi BL Lacertae Objects'. The Astrophysical Journal. 780 (1): 73. arXiv:1310.0006. Bibcode:2014ApJ...780...73A. doi:10.1088/0004-637X/780/1/73. ISSN0004-637X. S2CID8733720.
11. ^'SIMBAD query result'. simbad.u-strasbg.fr. Retrieved 2018-07-13.
12. ^'IceCube Neutrinos Point to Long-Sought Cosmic Ray Accelerator'. icecube.wisc.edu. Retrieved 2018-07-13.

External links[edit]